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Bochs/bochs/iodev/vga.cc
Volker Ruppert 02f326264e - charmap address for block numbers > 0 fixed 
- some BX_INFO and BX_DEBUG messages changed
2004-04-25 07:16:09 +00:00

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/////////////////////////////////////////////////////////////////////////
// $Id: vga.cc,v 1.101 2004-04-25 07:16:09 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002 MandrakeSoft S.A.
//
// MandrakeSoft S.A.
// 43, rue d'Aboukir
// 75002 Paris - France
// http://www.linux-mandrake.com/
// http://www.mandrakesoft.com/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// Define BX_PLUGGABLE in files that can be compiled into plugins. For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE
#include "bochs.h"
#define LOG_THIS theVga->
/* NOTES:
* I take it data rotate is a true rotate with carry of bit 0 to bit 7.
* support map mask (3c5 reg 02)
*/
/* Notes from cb
*
* It seems that the vga card should support multi bytes IO reads and write
* From my tests, inw(port) return port+1 * 256 + port, except for port 0x3c9
* (PEL data register, data cycling). More reverse engineering is needed.
* This would fix the gentoo bug.
*/
// (mch)
#define VGA_TRACE_FEATURE
// Only reference the array if the tile numbers are within the bounds
// of the array. If out of bounds, do nothing.
#define SET_TILE_UPDATED(xtile,ytile,value) \
do { \
if (((xtile) < BX_NUM_X_TILES) && ((ytile) < BX_NUM_Y_TILES)) \
BX_VGA_THIS s.vga_tile_updated[(xtile)][(ytile)] = value; \
} while (0)
// Only reference the array if the tile numbers are within the bounds
// of the array. If out of bounds, return 0.
#define GET_TILE_UPDATED(xtile,ytile) \
((((xtile) < BX_NUM_X_TILES) && ((ytile) < BX_NUM_Y_TILES))? \
BX_VGA_THIS s.vga_tile_updated[(xtile)][(ytile)] \
: 0)
static const Bit16u charmap_offset[8] = {
0x0000, 0x4000, 0x8000, 0xc000,
0x2000, 0x6000, 0xa000, 0xe000
};
static const Bit8u ccdat[16][4] = {
{ 0x00, 0x00, 0x00, 0x00 },
{ 0xff, 0x00, 0x00, 0x00 },
{ 0x00, 0xff, 0x00, 0x00 },
{ 0xff, 0xff, 0x00, 0x00 },
{ 0x00, 0x00, 0xff, 0x00 },
{ 0xff, 0x00, 0xff, 0x00 },
{ 0x00, 0xff, 0xff, 0x00 },
{ 0xff, 0xff, 0xff, 0x00 },
{ 0x00, 0x00, 0x00, 0xff },
{ 0xff, 0x00, 0x00, 0xff },
{ 0x00, 0xff, 0x00, 0xff },
{ 0xff, 0xff, 0x00, 0xff },
{ 0x00, 0x00, 0xff, 0xff },
{ 0xff, 0x00, 0xff, 0xff },
{ 0x00, 0xff, 0xff, 0xff },
{ 0xff, 0xff, 0xff, 0xff },
};
bx_vga_c *theVga = NULL;
unsigned old_iHeight = 0, old_iWidth = 0, old_MSL = 0, old_BPP = 0;
int
libvga_LTX_plugin_init(plugin_t *plugin, plugintype_t type, int argc, char *argv[])
{
theVga = new bx_vga_c ();
bx_devices.pluginVgaDevice = theVga;
BX_REGISTER_DEVICE_DEVMODEL(plugin, type, theVga, BX_PLUGIN_VGA);
return(0); // Success
}
void
libvga_LTX_plugin_fini(void)
{
}
bx_vga_c::bx_vga_c(void)
{
put("VGA");
s.vga_mem_updated = 0;
s.x_tilesize = X_TILESIZE;
s.y_tilesize = Y_TILESIZE;
timer_id = BX_NULL_TIMER_HANDLE;
}
bx_vga_c::~bx_vga_c(void)
{
// nothing for now
}
void
bx_vga_c::init(void)
{
unsigned i,string_i;
unsigned x,y;
#if BX_SUPPORT_VBE
Bit16u max_xres, max_yres, max_bpp;
#endif
int argc;
char *argv[16];
char *ptr;
char string[512];
unsigned addr;
for (addr=0x03B4; addr<=0x03B5; addr++) {
DEV_register_ioread_handler(this, read_handler, addr, "vga video", 1);
DEV_register_iowrite_handler(this, write_handler, addr, "vga video", 3);
}
for (addr=0x03BA; addr<=0x03BA; addr++) {
DEV_register_ioread_handler(this, read_handler, addr, "vga video", 1);
DEV_register_iowrite_handler(this, write_handler, addr, "vga video", 3);
}
for (addr=0x03C0; addr<=0x03CF; addr++) {
DEV_register_ioread_handler(this, read_handler, addr, "vga video", 1);
DEV_register_iowrite_handler(this, write_handler, addr, "vga video", 3);
}
for (addr=0x03D4; addr<=0x03D5; addr++) {
DEV_register_ioread_handler(this, read_handler, addr, "vga video", 1);
DEV_register_iowrite_handler(this, write_handler, addr, "vga video", 3);
}
for (addr=0x03DA; addr<=0x03DA; addr++) {
DEV_register_ioread_handler(this, read_handler, addr, "vga video", 1);
DEV_register_iowrite_handler(this, write_handler, addr, "vga video", 3);
}
BX_VGA_THIS s.misc_output.color_emulation = 1;
BX_VGA_THIS s.misc_output.enable_ram = 1;
BX_VGA_THIS s.misc_output.clock_select = 0;
BX_VGA_THIS s.misc_output.select_high_bank = 0;
BX_VGA_THIS s.misc_output.horiz_sync_pol = 1;
BX_VGA_THIS s.misc_output.vert_sync_pol = 1;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.graphics_alpha = 0;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.display_type = 0;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.enable_line_graphics = 1;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.blink_intensity = 0;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.pixel_panning_compat = 0;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.pixel_clock_select = 0;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.internal_palette_size = 0;
BX_VGA_THIS s.line_offset=80;
BX_VGA_THIS s.line_compare=1023;
BX_VGA_THIS s.vertical_display_end=399;
for (i=0; i<=0x18; i++)
BX_VGA_THIS s.CRTC.reg[i] = 0;
BX_VGA_THIS s.CRTC.address = 0;
BX_VGA_THIS s.attribute_ctrl.flip_flop = 0;
BX_VGA_THIS s.attribute_ctrl.address = 0;
BX_VGA_THIS s.attribute_ctrl.video_enabled = 1;
for (i=0; i<16; i++)
BX_VGA_THIS s.attribute_ctrl.palette_reg[i] = 0;
BX_VGA_THIS s.attribute_ctrl.overscan_color = 0;
BX_VGA_THIS s.attribute_ctrl.color_plane_enable = 0x0f;
BX_VGA_THIS s.attribute_ctrl.horiz_pel_panning = 0;
BX_VGA_THIS s.attribute_ctrl.color_select = 0;
for (i=0; i<256; i++) {
BX_VGA_THIS s.pel.data[i].red = 0;
BX_VGA_THIS s.pel.data[i].green = 0;
BX_VGA_THIS s.pel.data[i].blue = 0;
}
BX_VGA_THIS s.pel.write_data_register = 0;
BX_VGA_THIS s.pel.write_data_cycle = 0;
BX_VGA_THIS s.pel.read_data_register = 0;
BX_VGA_THIS s.pel.read_data_cycle = 0;
BX_VGA_THIS s.pel.dac_state = 0x01;
BX_VGA_THIS s.pel.mask = 0xff;
BX_VGA_THIS s.graphics_ctrl.index = 0;
BX_VGA_THIS s.graphics_ctrl.set_reset = 0;
BX_VGA_THIS s.graphics_ctrl.enable_set_reset = 0;
BX_VGA_THIS s.graphics_ctrl.color_compare = 0;
BX_VGA_THIS s.graphics_ctrl.data_rotate = 0;
BX_VGA_THIS s.graphics_ctrl.raster_op = 0;
BX_VGA_THIS s.graphics_ctrl.read_map_select = 0;
BX_VGA_THIS s.graphics_ctrl.write_mode = 0;
BX_VGA_THIS s.graphics_ctrl.read_mode = 0;
BX_VGA_THIS s.graphics_ctrl.odd_even = 0;
BX_VGA_THIS s.graphics_ctrl.chain_odd_even = 0;
BX_VGA_THIS s.graphics_ctrl.shift_reg = 0;
BX_VGA_THIS s.graphics_ctrl.graphics_alpha = 0;
BX_VGA_THIS s.graphics_ctrl.memory_mapping = 2; // monochrome text mode
BX_VGA_THIS s.graphics_ctrl.color_dont_care = 0;
BX_VGA_THIS s.graphics_ctrl.bitmask = 0;
for (i=0; i<4; i++) {
BX_VGA_THIS s.graphics_ctrl.latch[i] = 0;
}
BX_VGA_THIS s.sequencer.index = 0;
BX_VGA_THIS s.sequencer.map_mask = 0;
for (i=0; i<4; i++) {
BX_VGA_THIS s.sequencer.map_mask_bit[i] = 0;
}
BX_VGA_THIS s.sequencer.reset1 = 1;
BX_VGA_THIS s.sequencer.reset2 = 1;
BX_VGA_THIS s.sequencer.reg1 = 0;
BX_VGA_THIS s.sequencer.char_map_select = 0;
BX_VGA_THIS s.sequencer.extended_mem = 1; // display mem greater than 64K
BX_VGA_THIS s.sequencer.odd_even = 1; // use sequential addressing mode
BX_VGA_THIS s.sequencer.chain_four = 0; // use map mask & read map select
memset(BX_VGA_THIS s.vga_memory, 0, sizeof(BX_VGA_THIS s.vga_memory));
BX_VGA_THIS s.vga_mem_updated = 0;
for (y=0; y<480/Y_TILESIZE; y++)
for (x=0; x<640/X_TILESIZE; x++)
SET_TILE_UPDATED (x, y, 0);
memset(argv, 0, sizeof(argv));
argc = 1;
argv[0] = "bochs";
if (strlen(bx_options.Odisplaylib_options->getptr())) {
ptr = strtok(bx_options.Odisplaylib_options->getptr(), ",");
while (ptr) {
string_i = 0;
for (i=0; i<strlen(ptr); i++) {
if (!isspace(ptr[i])) string[string_i++] = ptr[i];
}
string[string_i] = '\0';
if (argv[argc] != NULL) {
free(argv[argc]);
argv[argc] = NULL;
}
if (argc < 16) {
argv[argc++] = strdup(string);
} else {
BX_PANIC (("too many parameters, max is 16\n"));
}
ptr = strtok(NULL, ",");
}
}
bx_gui->init(argc, argv, BX_VGA_THIS s.x_tilesize, BX_VGA_THIS s.y_tilesize);
for (i = 1; i < 16; i++)
{
if ( argv[i] != NULL )
{
free(argv[i]);
argv[i] = NULL;
}
}
BX_INFO(("interval=%u", bx_options.Ovga_update_interval->get ()));
if (BX_VGA_THIS timer_id == BX_NULL_TIMER_HANDLE) {
BX_VGA_THIS timer_id = bx_pc_system.register_timer(this, timer_handler,
bx_options.Ovga_update_interval->get (), 1, 1, "vga");
}
/* video card with BIOS ROM */
DEV_cmos_set_reg(0x14, (DEV_cmos_get_reg(0x14) & 0xcf) | 0x00);
BX_VGA_THIS s.charmap_address = 0;
BX_VGA_THIS s.x_dotclockdiv2 = 0;
BX_VGA_THIS s.y_doublescan = 0;
#if BX_SUPPORT_VBE
// The following is for the vbe display extension
for (addr=VBE_DISPI_IOPORT_INDEX; addr<=VBE_DISPI_IOPORT_DATA; addr++) {
DEV_register_ioread_handler(this, vbe_read_handler, addr, "vga video", 7);
DEV_register_iowrite_handler(this, vbe_write_handler, addr, "vga video", 7);
}
#if !BX_PCI_USB_SUPPORT
for (addr=VBE_DISPI_IOPORT_INDEX_OLD; addr<=VBE_DISPI_IOPORT_DATA_OLD; addr++) {
DEV_register_ioread_handler(this, vbe_read_handler, addr, "vga video", 7);
DEV_register_iowrite_handler(this, vbe_write_handler, addr, "vga video", 7);
}
#endif
BX_VGA_THIS s.vbe_cur_dispi=VBE_DISPI_ID0;
BX_VGA_THIS s.vbe_xres=640;
BX_VGA_THIS s.vbe_yres=480;
BX_VGA_THIS s.vbe_bpp=8;
BX_VGA_THIS s.vbe_bank=0;
BX_VGA_THIS s.vbe_enabled=0;
BX_VGA_THIS s.vbe_curindex=0;
BX_VGA_THIS s.vbe_offset_x=0;
BX_VGA_THIS s.vbe_offset_y=0;
BX_VGA_THIS s.vbe_virtual_xres=640;
BX_VGA_THIS s.vbe_virtual_yres=480;
BX_VGA_THIS s.vbe_bpp_multiplier=1;
BX_VGA_THIS s.vbe_virtual_start=0;
BX_VGA_THIS s.vbe_line_byte_width=640;
BX_VGA_THIS s.vbe_lfb_enabled=0;
BX_VGA_THIS s.vbe_get_capabilities=0;
bx_gui->get_capabilities(&max_xres, &max_yres,
&max_bpp);
if (max_xres > VBE_DISPI_MAX_XRES) {
BX_VGA_THIS s.vbe_max_xres=VBE_DISPI_MAX_XRES;
} else {
BX_VGA_THIS s.vbe_max_xres=max_xres;
}
if (max_yres > VBE_DISPI_MAX_YRES) {
BX_VGA_THIS s.vbe_max_yres=VBE_DISPI_MAX_YRES;
} else {
BX_VGA_THIS s.vbe_max_yres=max_yres;
}
if (max_bpp > VBE_DISPI_MAX_BPP) {
BX_VGA_THIS s.vbe_max_bpp=VBE_DISPI_MAX_BPP;
} else {
BX_VGA_THIS s.vbe_max_bpp=max_bpp;
}
BX_INFO(("VBE Bochs Display Extension Enabled"));
#endif
}
void
bx_vga_c::reset(unsigned type)
{
}
void
bx_vga_c::determine_screen_dimensions(unsigned *piHeight, unsigned *piWidth)
{
int ai[0x20];
int i,h,v;
for ( i = 0 ; i < 0x20 ; i++ )
ai[i] = BX_VGA_THIS s.CRTC.reg[i];
h = (ai[1] + 1) * 8;
v = (ai[18] | ((ai[7] & 0x02) << 7) | ((ai[7] & 0x40) << 3)) + 1;
if ( BX_VGA_THIS s.graphics_ctrl.shift_reg == 0 )
{
*piWidth = 640;
*piHeight = 480;
if ( BX_VGA_THIS s.CRTC.reg[6] == 0xBF )
{
if (BX_VGA_THIS s.CRTC.reg[23] == 0xA3 &&
BX_VGA_THIS s.CRTC.reg[20] == 0x40 &&
BX_VGA_THIS s.CRTC.reg[9] == 0x41)
{
*piWidth = 320;
*piHeight = 240;
}
else {
if (BX_VGA_THIS s.x_dotclockdiv2) h <<= 1;
*piWidth = h;
*piHeight = v;
}
}
else if ((h >= 640) && (v >= 480)) {
*piWidth = h;
*piHeight = v;
}
}
else if ( BX_VGA_THIS s.graphics_ctrl.shift_reg == 2 )
{
if ( BX_VGA_THIS s.sequencer.chain_four )
{
*piWidth = h;
*piHeight = v;
}
else
{
*piWidth = h;
*piHeight = v;
}
}
else
{
if (BX_VGA_THIS s.x_dotclockdiv2) h <<= 1;
*piWidth = h;
*piHeight = v;
}
}
// static IO port read callback handler
// redirects to non-static class handler to avoid virtual functions
Bit32u
bx_vga_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len)
{
#if !BX_USE_VGA_SMF
bx_vga_c *class_ptr = (bx_vga_c *) this_ptr;
return( class_ptr->read(address, io_len) );
}
Bit32u
bx_vga_c::read(Bit32u address, unsigned io_len)
{
#else
UNUSED(this_ptr);
#endif // !BX_USE_VGA_SMF
bx_bool horiz_retrace = 0, vert_retrace = 0;
Bit64u usec;
Bit16u vertres;
Bit8u retval;
#if defined(VGA_TRACE_FEATURE)
Bit32u ret = 0;
#define RETURN(x) do { ret = (x); goto read_return; } while (0)
#else
#define RETURN return
#endif
#ifdef __OS2__
if ( bx_options.videomode == BX_VIDEO_DIRECT )
{
return _inp(address);
}
#endif
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io read from 0x%04x", (unsigned) address));
#endif
if ( (address >= 0x03b0) && (address <= 0x03bf) &&
(BX_VGA_THIS s.misc_output.color_emulation) ) {
RETURN(0xff);
}
if ( (address >= 0x03d0) && (address <= 0x03df) &&
(BX_VGA_THIS s.misc_output.color_emulation==0) ) {
RETURN(0xff);
}
switch (address) {
case 0x03ba: /* Input Status 1 (monochrome emulation modes) */
case 0x03ca: /* Feature Control ??? */
case 0x03da: /* Input Status 1 (color emulation modes) */
// bit3: Vertical Retrace
// 0 = display is in the display mode
// 1 = display is in the vertical retrace mode
// bit0: Display Enable
// 0 = display is in the display mode
// 1 = display is not in the display mode; either the
// horizontal or vertical retrace period is active
// using 72 Hz vertical frequency
usec = bx_pc_system.time_usec();
switch ( ( BX_VGA_THIS s.misc_output.vert_sync_pol << 1) | BX_VGA_THIS s.misc_output.horiz_sync_pol )
{
case 0: vertres = 200; break;
case 1: vertres = 400; break;
case 2: vertres = 350; break;
default: vertres = 480; break;
}
if ((usec % 13888) < 70) {
vert_retrace = 1;
}
if ((usec % (13888 / vertres)) == 0) {
horiz_retrace = 1;
}
retval = 0;
if (horiz_retrace || vert_retrace)
retval = 0x01;
if (vert_retrace)
retval |= 0x08;
/* reading this port resets the flip-flop to address mode */
BX_VGA_THIS s.attribute_ctrl.flip_flop = 0;
RETURN(retval);
break;
case 0x03c0: /* */
if (BX_VGA_THIS s.attribute_ctrl.flip_flop == 0) {
//BX_INFO(("io read: 0x3c0: flip_flop = 0"));
retval =
(BX_VGA_THIS s.attribute_ctrl.video_enabled << 5) |
BX_VGA_THIS s.attribute_ctrl.address;
RETURN(retval);
}
else {
BX_ERROR(("io read: 0x3c0: flip_flop != 0"));
return(0);
}
break;
case 0x03c1: /* */
switch (BX_VGA_THIS s.attribute_ctrl.address) {
case 0x00: case 0x01: case 0x02: case 0x03:
case 0x04: case 0x05: case 0x06: case 0x07:
case 0x08: case 0x09: case 0x0a: case 0x0b:
case 0x0c: case 0x0d: case 0x0e: case 0x0f:
retval = BX_VGA_THIS s.attribute_ctrl.palette_reg[BX_VGA_THIS s.attribute_ctrl.address];
RETURN(retval);
break;
case 0x10: /* mode control register */
retval =
(BX_VGA_THIS s.attribute_ctrl.mode_ctrl.graphics_alpha << 0) |
(BX_VGA_THIS s.attribute_ctrl.mode_ctrl.display_type << 1) |
(BX_VGA_THIS s.attribute_ctrl.mode_ctrl.enable_line_graphics << 2) |
(BX_VGA_THIS s.attribute_ctrl.mode_ctrl.blink_intensity << 3) |
(BX_VGA_THIS s.attribute_ctrl.mode_ctrl.pixel_panning_compat << 5) |
(BX_VGA_THIS s.attribute_ctrl.mode_ctrl.pixel_clock_select << 6) |
(BX_VGA_THIS s.attribute_ctrl.mode_ctrl.internal_palette_size << 7);
RETURN(retval);
break;
case 0x11: /* overscan color register */
RETURN(BX_VGA_THIS s.attribute_ctrl.overscan_color);
break;
case 0x12: /* color plane enable */
RETURN(BX_VGA_THIS s.attribute_ctrl.color_plane_enable);
break;
case 0x13: /* horizontal PEL panning register */
RETURN(BX_VGA_THIS s.attribute_ctrl.horiz_pel_panning);
break;
case 0x14: /* color select register */
RETURN(BX_VGA_THIS s.attribute_ctrl.color_select);
break;
default:
BX_INFO(("io read: 0x3c1: unknown register 0x%02x",
(unsigned) BX_VGA_THIS s.attribute_ctrl.address));
RETURN(0);
}
break;
case 0x03c2: /* Input Status 0 */
BX_DEBUG(("io read 0x3c2: input status #0: ignoring"));
RETURN(0);
break;
case 0x03c3: /* VGA Enable Register */
RETURN(1);
break;
case 0x03c4: /* Sequencer Index Register */
RETURN(BX_VGA_THIS s.sequencer.index);
break;
case 0x03c5: /* Sequencer Registers 00..04 */
switch (BX_VGA_THIS s.sequencer.index) {
case 0: /* sequencer: reset */
BX_DEBUG(("io read 0x3c5: sequencer reset"));
RETURN(BX_VGA_THIS s.sequencer.reset1 | (BX_VGA_THIS s.sequencer.reset2<<1));
break;
case 1: /* sequencer: clocking mode */
BX_DEBUG(("io read 0x3c5: sequencer clocking mode"));
RETURN(BX_VGA_THIS s.sequencer.reg1);
break;
case 2: /* sequencer: map mask register */
RETURN(BX_VGA_THIS s.sequencer.map_mask);
break;
case 3: /* sequencer: character map select register */
RETURN(BX_VGA_THIS s.sequencer.char_map_select);
break;
case 4: /* sequencer: memory mode register */
retval =
(BX_VGA_THIS s.sequencer.extended_mem << 1) |
(BX_VGA_THIS s.sequencer.odd_even << 2) |
(BX_VGA_THIS s.sequencer.chain_four << 3);
RETURN(retval);
break;
default:
BX_DEBUG(("io read 0x3c5: index %u unhandled",
(unsigned) BX_VGA_THIS s.sequencer.index));
RETURN(0);
}
break;
case 0x03c6: /* PEL mask ??? */
RETURN(BX_VGA_THIS s.pel.mask);
break;
case 0x03c7: /* DAC state, read = 11b, write = 00b */
RETURN(BX_VGA_THIS s.pel.dac_state);
break;
case 0x03c8: /* PEL address write mode */
RETURN(BX_VGA_THIS s.pel.write_data_register);
break;
case 0x03c9: /* PEL Data Register, colors 00..FF */
if (BX_VGA_THIS s.pel.dac_state == 0x03) {
switch (BX_VGA_THIS s.pel.read_data_cycle) {
case 0:
retval = BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.read_data_register].red;
break;
case 1:
retval = BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.read_data_register].green;
break;
case 2:
retval = BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.read_data_register].blue;
break;
default:
retval = 0; // keep compiler happy
}
BX_VGA_THIS s.pel.read_data_cycle++;
if (BX_VGA_THIS s.pel.read_data_cycle >= 3) {
BX_VGA_THIS s.pel.read_data_cycle = 0;
BX_VGA_THIS s.pel.read_data_register++;
}
}
else {
retval = 0x3f;
}
RETURN(retval);
break;
case 0x03cc: /* Miscellaneous Output / Graphics 1 Position ??? */
retval =
((BX_VGA_THIS s.misc_output.color_emulation & 0x01) << 0) |
((BX_VGA_THIS s.misc_output.enable_ram & 0x01) << 1) |
((BX_VGA_THIS s.misc_output.clock_select & 0x03) << 2) |
((BX_VGA_THIS s.misc_output.select_high_bank & 0x01) << 5) |
((BX_VGA_THIS s.misc_output.horiz_sync_pol & 0x01) << 6) |
((BX_VGA_THIS s.misc_output.vert_sync_pol & 0x01) << 7);
RETURN(retval);
break;
case 0x03ce: /* Graphics Controller Index Register */
RETURN(BX_VGA_THIS s.graphics_ctrl.index);
break;
case 0x03cd: /* ??? */
BX_DEBUG(("io read from 03cd"));
RETURN(0x00);
break;
case 0x03cf: /* Graphics Controller Registers 00..08 */
switch (BX_VGA_THIS s.graphics_ctrl.index) {
case 0: /* Set/Reset */
RETURN(BX_VGA_THIS s.graphics_ctrl.set_reset);
break;
case 1: /* Enable Set/Reset */
RETURN(BX_VGA_THIS s.graphics_ctrl.enable_set_reset);
break;
case 2: /* Color Compare */
RETURN(BX_VGA_THIS s.graphics_ctrl.color_compare);
break;
case 3: /* Data Rotate */
retval =
((BX_VGA_THIS s.graphics_ctrl.raster_op & 0x03) << 3) |
((BX_VGA_THIS s.graphics_ctrl.data_rotate & 0x07) << 0);
RETURN(retval);
break;
case 4: /* Read Map Select */
RETURN(BX_VGA_THIS s.graphics_ctrl.read_map_select);
break;
case 5: /* Mode */
retval =
((BX_VGA_THIS s.graphics_ctrl.shift_reg & 0x03) << 5) |
((BX_VGA_THIS s.graphics_ctrl.odd_even & 0x01 ) << 4) |
((BX_VGA_THIS s.graphics_ctrl.read_mode & 0x01) << 3) |
((BX_VGA_THIS s.graphics_ctrl.write_mode & 0x03) << 0);
if (BX_VGA_THIS s.graphics_ctrl.odd_even ||
BX_VGA_THIS s.graphics_ctrl.shift_reg)
BX_DEBUG(("io read 0x3cf: reg 05 = 0x%02x", (unsigned) retval));
RETURN(retval);
break;
case 6: /* Miscellaneous */
retval =
((BX_VGA_THIS s.graphics_ctrl.memory_mapping & 0x03 ) << 2) |
((BX_VGA_THIS s.graphics_ctrl.odd_even & 0x01) << 1) |
((BX_VGA_THIS s.graphics_ctrl.graphics_alpha & 0x01) << 0);
RETURN(retval);
break;
case 7: /* Color Don't Care */
RETURN(BX_VGA_THIS s.graphics_ctrl.color_dont_care);
break;
case 8: /* Bit Mask */
RETURN(BX_VGA_THIS s.graphics_ctrl.bitmask);
break;
default:
/* ??? */
BX_DEBUG(("io read: 0x3cf: index %u unhandled",
(unsigned) BX_VGA_THIS s.graphics_ctrl.index));
RETURN(0);
}
break;
case 0x03d4: /* CRTC Index Register (color emulation modes) */
RETURN(BX_VGA_THIS s.CRTC.address);
break;
case 0x03b5: /* CRTC Registers (monochrome emulation modes) */
case 0x03d5: /* CRTC Registers (color emulation modes) */
if (BX_VGA_THIS s.CRTC.address > 0x18) {
BX_DEBUG(("io read: invalid CRTC register 0x%02x",
(unsigned) BX_VGA_THIS s.CRTC.address));
RETURN(0);
}
RETURN(BX_VGA_THIS s.CRTC.reg[BX_VGA_THIS s.CRTC.address]);
break;
case 0x03b4: /* CRTC Index Register (monochrome emulation modes) */
case 0x03cb: /* not sure but OpenBSD reads it a lot */
default:
BX_INFO(("io read from vga port 0x%04x", (unsigned) address));
RETURN(0); /* keep compiler happy */
}
#if defined(VGA_TRACE_FEATURE)
read_return:
BX_DEBUG(("8-bit read from %04x = %02x", (unsigned) address, ret));
return ret;
#endif
}
#if defined(VGA_TRACE_FEATURE)
#undef RETURN
#endif
// static IO port write callback handler
// redirects to non-static class handler to avoid virtual functions
void
bx_vga_c::write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
{
#if !BX_USE_VGA_SMF
bx_vga_c *class_ptr = (bx_vga_c *) this_ptr;
class_ptr->write(address, value, io_len, 0);
#else
UNUSED(this_ptr);
theVga->write(address, value, io_len, 0);
#endif
}
void
bx_vga_c::write_handler_no_log(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
{
#if !BX_USE_VGA_SMF
bx_vga_c *class_ptr = (bx_vga_c *) this_ptr;
class_ptr->write(address, value, io_len, 1);
#else
UNUSED(this_ptr);
theVga->write(address, value, io_len, 1);
#endif
}
void
bx_vga_c::write(Bit32u address, Bit32u value, unsigned io_len, bx_bool no_log)
{
unsigned i;
Bit8u charmap1, charmap2, prev_memory_mapping;
bx_bool prev_video_enabled, prev_line_graphics, prev_int_pal_size;
bx_bool prev_graphics_alpha, prev_chain_odd_even;
bx_bool needs_update = 0;
#if defined(VGA_TRACE_FEATURE)
if (!no_log)
switch (io_len) {
case 1:
BX_DEBUG(("8-bit write to %04x = %02x", (unsigned)address, (unsigned)value));
break;
case 2:
BX_DEBUG(("16-bit write to %04x = %04x", (unsigned)address, (unsigned)value));
break;
default:
BX_PANIC(("Weird VGA write size"));
}
#else
if (io_len == 1) {
BX_DEBUG(("io write to 0x%04x = 0x%02x", (unsigned) address,
(unsigned) value));
}
#endif
if (io_len == 2) {
#if BX_USE_VGA_SMF
bx_vga_c::write_handler_no_log(0, address, value & 0xff, 1);
bx_vga_c::write_handler_no_log(0, address+1, (value >> 8) & 0xff, 1);
#else
bx_vga_c::write(address, value & 0xff, 1, 1);
bx_vga_c::write(address+1, (value >> 8) & 0xff, 1, 1);
#endif
return;
}
#ifdef __OS2__
if ( bx_options.videomode == BX_VIDEO_DIRECT )
{
_outp(address,value);
return;
}
#endif
if ( (address >= 0x03b0) && (address <= 0x03bf) &&
(BX_VGA_THIS s.misc_output.color_emulation) )
return;
if ( (address >= 0x03d0) && (address <= 0x03df) &&
(BX_VGA_THIS s.misc_output.color_emulation==0) )
return;
switch (address) {
case 0x03ba: /* Feature Control (monochrome emulation modes) */
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 3ba: feature control: ignoring"));
#endif
break;
case 0x03c0: /* Attribute Controller */
if (BX_VGA_THIS s.attribute_ctrl.flip_flop == 0) { /* address mode */
prev_video_enabled = BX_VGA_THIS s.attribute_ctrl.video_enabled;
BX_VGA_THIS s.attribute_ctrl.video_enabled = (value >> 5) & 0x01;
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 3c0: video_enabled = %u",
(unsigned) BX_VGA_THIS s.attribute_ctrl.video_enabled));
#endif
if (BX_VGA_THIS s.attribute_ctrl.video_enabled == 0)
bx_gui->clear_screen();
else if (!prev_video_enabled) {
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("found enable transition"));
#endif
needs_update = 1;
}
value &= 0x1f; /* address = bits 0..4 */
BX_VGA_THIS s.attribute_ctrl.address = value;
switch (value) {
case 0x00: case 0x01: case 0x02: case 0x03:
case 0x04: case 0x05: case 0x06: case 0x07:
case 0x08: case 0x09: case 0x0a: case 0x0b:
case 0x0c: case 0x0d: case 0x0e: case 0x0f:
break;
default:
BX_DEBUG(("io write 0x3c0: address mode reg=0x%02x",
(unsigned) value));
}
}
else { /* data-write mode */
switch (BX_VGA_THIS s.attribute_ctrl.address) {
case 0x00: case 0x01: case 0x02: case 0x03:
case 0x04: case 0x05: case 0x06: case 0x07:
case 0x08: case 0x09: case 0x0a: case 0x0b:
case 0x0c: case 0x0d: case 0x0e: case 0x0f:
if (value != BX_VGA_THIS s.attribute_ctrl.palette_reg[BX_VGA_THIS s.attribute_ctrl.address]) {
BX_VGA_THIS s.attribute_ctrl.palette_reg[BX_VGA_THIS s.attribute_ctrl.address] =
value;
needs_update = 1;
}
break;
case 0x10: // mode control register
prev_line_graphics = BX_VGA_THIS s.attribute_ctrl.mode_ctrl.enable_line_graphics;
prev_int_pal_size = BX_VGA_THIS s.attribute_ctrl.mode_ctrl.internal_palette_size;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.graphics_alpha =
(value >> 0) & 0x01;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.display_type =
(value >> 1) & 0x01;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.enable_line_graphics =
(value >> 2) & 0x01;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.blink_intensity =
(value >> 3) & 0x01;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.pixel_panning_compat =
(value >> 5) & 0x01;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.pixel_clock_select =
(value >> 6) & 0x01;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.internal_palette_size =
(value >> 7) & 0x01;
if (((value >> 2) & 0x01) != prev_line_graphics) {
bx_gui->set_text_charmap(
& BX_VGA_THIS s.vga_memory[0x20000 + BX_VGA_THIS s.charmap_address]);
BX_VGA_THIS s.vga_mem_updated = 1;
}
if (((value >> 7) & 0x01) != prev_int_pal_size) {
needs_update = 1;
}
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 0x3c0: mode control: 0x%02x",
(unsigned) value));
#endif
break;
case 0x11: // Overscan Color Register
BX_VGA_THIS s.attribute_ctrl.overscan_color = (value & 0x3f);
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 0x3c0: overscan color = 0x%02x",
(unsigned) value));
#endif
break;
case 0x12: // Color Plane Enable Register
BX_VGA_THIS s.attribute_ctrl.color_plane_enable = (value & 0x0f);
needs_update = 1;
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 0x3c0: color plane enable = 0x%02x",
(unsigned) value));
#endif
break;
case 0x13: // Horizontal Pixel Panning Register
BX_VGA_THIS s.attribute_ctrl.horiz_pel_panning = (value & 0x0f);
needs_update = 1;
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 0x3c0: horiz pel panning = 0x%02x",
(unsigned) value));
#endif
break;
case 0x14: // Color Select Register
BX_VGA_THIS s.attribute_ctrl.color_select = (value & 0x0f);
needs_update = 1;
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 0x3c0: color select = 0x%02x",
(unsigned) BX_VGA_THIS s.attribute_ctrl.color_select));
#endif
break;
default:
BX_DEBUG(("io write 0x3c0: data-write mode 0x%02x",
(unsigned) BX_VGA_THIS s.attribute_ctrl.address));
}
}
BX_VGA_THIS s.attribute_ctrl.flip_flop = !BX_VGA_THIS s.attribute_ctrl.flip_flop;
break;
case 0x03c2: // Miscellaneous Output Register
BX_VGA_THIS s.misc_output.color_emulation = (value >> 0) & 0x01;
BX_VGA_THIS s.misc_output.enable_ram = (value >> 1) & 0x01;
BX_VGA_THIS s.misc_output.clock_select = (value >> 2) & 0x03;
BX_VGA_THIS s.misc_output.select_high_bank = (value >> 5) & 0x01;
BX_VGA_THIS s.misc_output.horiz_sync_pol = (value >> 6) & 0x01;
BX_VGA_THIS s.misc_output.vert_sync_pol = (value >> 7) & 0x01;
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 3c2:"));
BX_DEBUG((" color_emulation (attempted) = %u",
(value >> 0) & 0x01));
BX_DEBUG((" enable_ram = %u",
(unsigned) BX_VGA_THIS s.misc_output.enable_ram));
BX_DEBUG((" clock_select = %u",
(unsigned) BX_VGA_THIS s.misc_output.clock_select));
BX_DEBUG((" select_high_bank = %u",
(unsigned) BX_VGA_THIS s.misc_output.select_high_bank));
BX_DEBUG((" horiz_sync_pol = %u",
(unsigned) BX_VGA_THIS s.misc_output.horiz_sync_pol));
BX_DEBUG((" vert_sync_pol = %u",
(unsigned) BX_VGA_THIS s.misc_output.vert_sync_pol));
#endif
break;
case 0x03c3: // VGA enable
// bit0: enables VGA display if set
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 3c3: (ignoring) VGA enable = %u",
(unsigned) (value & 0x01) ));
#endif
break;
case 0x03c4: /* Sequencer Index Register */
if (value > 4) {
BX_DEBUG(("io write 3c4: value > 4"));
}
BX_VGA_THIS s.sequencer.index = value;
break;
case 0x03c5: /* Sequencer Registers 00..04 */
switch (BX_VGA_THIS s.sequencer.index) {
case 0: /* sequencer: reset */
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("write 0x3c5: sequencer reset: value=0x%02x",
(unsigned) value));
#endif
if (BX_VGA_THIS s.sequencer.reset1 && ((value & 0x01) == 0)) {
BX_VGA_THIS s.sequencer.char_map_select = 0;
BX_VGA_THIS s.charmap_address = 0;
bx_gui->set_text_charmap(
& BX_VGA_THIS s.vga_memory[0x20000 + BX_VGA_THIS s.charmap_address]);
BX_VGA_THIS s.vga_mem_updated = 1;
}
BX_VGA_THIS s.sequencer.reset1 = (value >> 0) & 0x01;
BX_VGA_THIS s.sequencer.reset2 = (value >> 1) & 0x01;
break;
case 1: /* sequencer: clocking mode */
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 0x3c5=0x%02x: clocking mode reg: ignoring",
(unsigned) value));
#endif
BX_VGA_THIS s.sequencer.reg1 = value & 0x3f;
BX_VGA_THIS s.x_dotclockdiv2 = ((value & 0x08) > 0);
break;
case 2: /* sequencer: map mask register */
BX_VGA_THIS s.sequencer.map_mask = (value & 0x0f);
for (i=0; i<4; i++)
BX_VGA_THIS s.sequencer.map_mask_bit[i] = (value >> i) & 0x01;
break;
case 3: /* sequencer: character map select register */
BX_VGA_THIS s.sequencer.char_map_select = value;
charmap1 = value & 0x13;
if (charmap1 > 3) charmap1 = (charmap1 & 3) + 4;
charmap2 = (value & 0x2C) >> 2;
if (charmap2 > 3) charmap2 = (charmap2 & 3) + 4;
if (BX_VGA_THIS s.CRTC.reg[0x09] > 0) {
BX_VGA_THIS s.charmap_address = charmap_offset[charmap1];
bx_gui->set_text_charmap(
& BX_VGA_THIS s.vga_memory[0x20000 + BX_VGA_THIS s.charmap_address]);
BX_VGA_THIS s.vga_mem_updated = 1;
}
if (charmap2 != charmap1)
BX_INFO(("char map select: map #2 in block #%d unused", charmap2));
break;
case 4: /* sequencer: memory mode register */
BX_VGA_THIS s.sequencer.extended_mem = (value >> 1) & 0x01;
BX_VGA_THIS s.sequencer.odd_even = (value >> 2) & 0x01;
BX_VGA_THIS s.sequencer.chain_four = (value >> 3) & 0x01;
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 0x3c5: memory mode:"));
BX_DEBUG((" extended_mem = %u",
(unsigned) BX_VGA_THIS s.sequencer.extended_mem));
BX_DEBUG((" odd_even = %u",
(unsigned) BX_VGA_THIS s.sequencer.odd_even));
BX_DEBUG((" chain_four = %u",
(unsigned) BX_VGA_THIS s.sequencer.chain_four));
#endif
break;
default:
BX_DEBUG(("io write 0x3c5: index 0x%02x unhandled",
(unsigned) BX_VGA_THIS s.sequencer.index));
}
break;
case 0x03c6: /* PEL mask */
BX_VGA_THIS s.pel.mask = value;
if (BX_VGA_THIS s.pel.mask != 0xff)
BX_DEBUG(("io write 0x3c6: PEL mask=0x%02x != 0xFF", value));
// BX_VGA_THIS s.pel.mask should be and'd with final value before
// indexing into color register BX_VGA_THIS s.pel.data[]
break;
case 0x03c7: // PEL address, read mode
BX_VGA_THIS s.pel.read_data_register = value;
BX_VGA_THIS s.pel.read_data_cycle = 0;
BX_VGA_THIS s.pel.dac_state = 0x03;
break;
case 0x03c8: /* PEL address write mode */
BX_VGA_THIS s.pel.write_data_register = value;
BX_VGA_THIS s.pel.write_data_cycle = 0;
BX_VGA_THIS s.pel.dac_state = 0x00;
break;
case 0x03c9: /* PEL Data Register, colors 00..FF */
switch (BX_VGA_THIS s.pel.write_data_cycle) {
case 0:
BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.write_data_register].red = value;
break;
case 1:
BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.write_data_register].green = value;
break;
case 2:
BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.write_data_register].blue = value;
needs_update |= bx_gui->palette_change(BX_VGA_THIS s.pel.write_data_register,
BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.write_data_register].red<<2,
BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.write_data_register].green<<2,
BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.write_data_register].blue<<2);
break;
}
BX_VGA_THIS s.pel.write_data_cycle++;
if (BX_VGA_THIS s.pel.write_data_cycle >= 3) {
//BX_INFO(("BX_VGA_THIS s.pel.data[%u] {r=%u, g=%u, b=%u}",
// (unsigned) BX_VGA_THIS s.pel.write_data_register,
// (unsigned) BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.write_data_register].red,
// (unsigned) BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.write_data_register].green,
// (unsigned) BX_VGA_THIS s.pel.data[BX_VGA_THIS s.pel.write_data_register].blue);
BX_VGA_THIS s.pel.write_data_cycle = 0;
BX_VGA_THIS s.pel.write_data_register++;
}
break;
case 0x03ca: /* Graphics 2 Position (EGA) */
// ignore, EGA only???
break;
case 0x03cc: /* Graphics 1 Position (EGA) */
// ignore, EGA only???
break;
case 0x03cd: /* ??? */
BX_DEBUG(("io write to 0x3cd = 0x%02x", (unsigned) value));
break;
case 0x03ce: /* Graphics Controller Index Register */
if (value > 0x08) /* ??? */
BX_DEBUG(("io write: 0x3ce: value > 8"));
BX_VGA_THIS s.graphics_ctrl.index = value;
break;
case 0x03cf: /* Graphics Controller Registers 00..08 */
switch (BX_VGA_THIS s.graphics_ctrl.index) {
case 0: /* Set/Reset */
BX_VGA_THIS s.graphics_ctrl.set_reset = value & 0x0f;
break;
case 1: /* Enable Set/Reset */
BX_VGA_THIS s.graphics_ctrl.enable_set_reset = value & 0x0f;
break;
case 2: /* Color Compare */
BX_VGA_THIS s.graphics_ctrl.color_compare = value & 0x0f;
break;
case 3: /* Data Rotate */
BX_VGA_THIS s.graphics_ctrl.data_rotate = value & 0x07;
/* ??? is this bits 3..4 or 4..5 */
BX_VGA_THIS s.graphics_ctrl.raster_op = (value >> 3) & 0x03; /* ??? */
break;
case 4: /* Read Map Select */
BX_VGA_THIS s.graphics_ctrl.read_map_select = value & 0x03;
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write to 0x3cf = 0x%02x (RMS)", (unsigned) value));
#endif
break;
case 5: /* Mode */
BX_VGA_THIS s.graphics_ctrl.write_mode = value & 0x03;
BX_VGA_THIS s.graphics_ctrl.read_mode = (value >> 3) & 0x01;
BX_VGA_THIS s.graphics_ctrl.odd_even = (value >> 4) & 0x01;
BX_VGA_THIS s.graphics_ctrl.shift_reg = (value >> 5) & 0x03;
if (BX_VGA_THIS s.graphics_ctrl.odd_even)
BX_DEBUG(("io write: 0x3cf: mode reg: value = 0x%02x",
(unsigned) value));
if (BX_VGA_THIS s.graphics_ctrl.shift_reg)
BX_DEBUG(("io write: 0x3cf: mode reg: value = 0x%02x",
(unsigned) value));
break;
case 6: /* Miscellaneous */
prev_graphics_alpha = BX_VGA_THIS s.graphics_ctrl.graphics_alpha;
prev_chain_odd_even = BX_VGA_THIS s.graphics_ctrl.chain_odd_even;
prev_memory_mapping = BX_VGA_THIS s.graphics_ctrl.memory_mapping;
BX_VGA_THIS s.graphics_ctrl.graphics_alpha = value & 0x01;
BX_VGA_THIS s.graphics_ctrl.chain_odd_even = (value >> 1) & 0x01;
BX_VGA_THIS s.graphics_ctrl.memory_mapping = (value >> 2) & 0x03;
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("memory_mapping set to %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.memory_mapping));
BX_DEBUG(("graphics mode set to %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.graphics_alpha));
BX_DEBUG(("odd_even mode set to %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.odd_even));
BX_DEBUG(("io write: 0x3cf: misc reg: value = 0x%02x",
(unsigned) value));
#endif
if (prev_memory_mapping != BX_VGA_THIS s.graphics_ctrl.memory_mapping)
needs_update = 1;
if (prev_graphics_alpha != BX_VGA_THIS s.graphics_ctrl.graphics_alpha) {
needs_update = 1;
old_iHeight = 0;
}
break;
case 7: /* Color Don't Care */
BX_VGA_THIS s.graphics_ctrl.color_dont_care = value & 0x0f;
break;
case 8: /* Bit Mask */
BX_VGA_THIS s.graphics_ctrl.bitmask = value;
break;
default:
/* ??? */
BX_DEBUG(("io write: 0x3cf: index %u unhandled",
(unsigned) BX_VGA_THIS s.graphics_ctrl.index));
}
break;
case 0x03b4: /* CRTC Index Register (monochrome emulation modes) */
case 0x03d4: /* CRTC Index Register (color emulation modes) */
BX_VGA_THIS s.CRTC.address = value & 0x7f;
if (BX_VGA_THIS s.CRTC.address > 0x18)
BX_DEBUG(("write: invalid CRTC register 0x%02x selected",
(unsigned) BX_VGA_THIS s.CRTC.address));
break;
case 0x03b5: /* CRTC Registers (monochrome emulation modes) */
case 0x03d5: /* CRTC Registers (color emulation modes) */
if (BX_VGA_THIS s.CRTC.address > 0x18) {
BX_DEBUG(("write: invalid CRTC register 0x%02x ignored",
(unsigned) BX_VGA_THIS s.CRTC.address));
return;
}
if (value != BX_VGA_THIS s.CRTC.reg[BX_VGA_THIS s.CRTC.address]) {
BX_VGA_THIS s.CRTC.reg[BX_VGA_THIS s.CRTC.address] = value;
switch (BX_VGA_THIS s.CRTC.address) {
case 0x07:
BX_VGA_THIS s.vertical_display_end &= 0xff;
if (BX_VGA_THIS s.CRTC.reg[0x07] & 0x02) BX_VGA_THIS s.vertical_display_end |= 0x100;
if (BX_VGA_THIS s.CRTC.reg[0x07] & 0x40) BX_VGA_THIS s.vertical_display_end |= 0x200;
BX_VGA_THIS s.line_compare &= 0x2ff;
if (BX_VGA_THIS s.CRTC.reg[0x07] & 0x10) BX_VGA_THIS s.line_compare |= 0x100;
needs_update = 1;
break;
case 0x08:
// Vertical pel panning change
needs_update = 1;
break;
case 0x09:
BX_VGA_THIS s.y_doublescan = ((value & 0x9f) > 0);
BX_VGA_THIS s.line_compare &= 0x1ff;
if (BX_VGA_THIS s.CRTC.reg[0x09] & 0x40) BX_VGA_THIS s.line_compare |= 0x200;
needs_update = 1;
break;
case 0x0A:
case 0x0B:
case 0x0E:
case 0x0F:
// Cursor size / location change
BX_VGA_THIS s.vga_mem_updated = 1;
break;
case 0x0C:
case 0x0D:
// Start address change
if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha) {
needs_update = 1;
} else {
BX_VGA_THIS s.vga_mem_updated = 1;
}
break;
case 0x12:
BX_VGA_THIS s.vertical_display_end &= 0x300;
BX_VGA_THIS s.vertical_display_end |= BX_VGA_THIS s.CRTC.reg[0x12];
break;
case 0x13:
case 0x14:
case 0x17:
// Line offset change
BX_VGA_THIS s.line_offset = BX_VGA_THIS s.CRTC.reg[0x13] << 1;
if (BX_VGA_THIS s.CRTC.reg[0x14] & 0x40) BX_VGA_THIS s.line_offset <<= 2;
else if ((BX_VGA_THIS s.CRTC.reg[0x17] & 0x40) == 0) BX_VGA_THIS s.line_offset <<= 1;
needs_update = 1;
break;
case 0x18:
BX_VGA_THIS s.line_compare &= 0x300;
BX_VGA_THIS s.line_compare |= BX_VGA_THIS s.CRTC.reg[0x18];
needs_update = 1;
break;
}
}
break;
case 0x03da: /* Feature Control (color emulation modes) */
BX_DEBUG(("io write: 3da: ignoring: feature ctrl & vert sync"));
break;
case 0x03c1: /* */
default:
BX_ERROR(("unsupported io write to port 0x%04x, val=0x%02x",
(unsigned) address, (unsigned) value));
}
if (needs_update) {
BX_VGA_THIS s.vga_mem_updated = 1;
// Mark all video as updated so the changes will go through
if ((BX_VGA_THIS s.graphics_ctrl.graphics_alpha)
#if BX_SUPPORT_VBE
|| (BX_VGA_THIS s.vbe_enabled)
#endif
) {
for (unsigned xti = 0; xti < BX_NUM_X_TILES; xti++) {
for (unsigned yti = 0; yti < BX_NUM_Y_TILES; yti++) {
SET_TILE_UPDATED (xti, yti, 1);
}
}
} else {
memset(BX_VGA_THIS s.text_snapshot, 0,
sizeof(BX_VGA_THIS s.text_snapshot));
}
}
}
void
bx_vga_c::set_update_interval (unsigned interval)
{
BX_INFO (("Changing timer interval to %d\n", interval));
BX_VGA_THIS timer_handler (theVga);
bx_pc_system.activate_timer (BX_VGA_THIS timer_id, interval, 1);
}
void
bx_vga_c::trigger_timer(void *this_ptr)
{
timer_handler(this_ptr);
}
void
bx_vga_c::timer_handler(void *this_ptr)
{
#if !BX_USE_VGA_SMF
bx_vga_c *class_ptr = (bx_vga_c *) this_ptr;
class_ptr->timer();
}
void
bx_vga_c::timer(void)
{
#else
UNUSED(this_ptr);
#endif
update();
bx_gui->flush();
}
void
bx_vga_c::update(void)
{
unsigned iHeight, iWidth;
/* no screen update necessary */
if (BX_VGA_THIS s.vga_mem_updated==0)
return;
/* skip screen update when the sequencer is in reset mode or video is disabled */
if (!BX_VGA_THIS s.sequencer.reset1 || !BX_VGA_THIS s.sequencer.reset2
|| !BX_VGA_THIS s.attribute_ctrl.video_enabled)
return;
/* skip screen update if the vertical retrace is in progress
(using 72 Hz vertical frequency) */
if ((bx_pc_system.time_usec() % 13888) < 70)
return;
#if BX_SUPPORT_VBE
if ((BX_VGA_THIS s.vbe_enabled) && (BX_VGA_THIS s.vbe_bpp != VBE_DISPI_BPP_4))
{
// specific VBE code display update code
// this is partly copied/modified from the 320x200x8 update more below
unsigned xc, yc, xti, yti;
unsigned r;
unsigned long pixely, bmp_ofs_y, tile_ofs_y;
if (BX_VGA_THIS s.vbe_bpp == VBE_DISPI_BPP_32)
{
Bit32u *vidmem = (Bit32u *)(&BX_VGA_THIS s.vbe_memory[BX_VGA_THIS s.vbe_virtual_start]);
Bit32u *tile = (Bit32u *)(BX_VGA_THIS s.tile);
Bit16u width = BX_VGA_THIS s.vbe_virtual_xres;
Bit32u *vidptr, *tileptr;
iWidth=BX_VGA_THIS s.vbe_xres;
iHeight=BX_VGA_THIS s.vbe_yres;
for (yc=0, yti = 0; yc<iHeight; yc+=Y_TILESIZE, yti++)
{
for (xc=0, xti = 0; xc<iWidth; xc+=X_TILESIZE, xti++)
{
if (GET_TILE_UPDATED (xti, yti))
{
for (r=0; r<Y_TILESIZE; r++)
{
pixely = yc + r;
// calc offsets into video and tile memory
bmp_ofs_y = pixely*width;
tile_ofs_y = r*X_TILESIZE;
// get offsets so that we do less calc in the inner loop
vidptr = &vidmem[bmp_ofs_y+xc];
tileptr = &tile[tile_ofs_y];
memmove(tileptr, vidptr, X_TILESIZE<<2);
}
SET_TILE_UPDATED (xti, yti, 0);
bx_gui->graphics_tile_update(BX_VGA_THIS s.tile, xc, yc);
}
}
}
}
else if (BX_VGA_THIS s.vbe_bpp == VBE_DISPI_BPP_24)
{
Bit8u *vidmem = &BX_VGA_THIS s.vbe_memory[BX_VGA_THIS s.vbe_virtual_start];
Bit8u *tile = BX_VGA_THIS s.tile;
Bit16u width = BX_VGA_THIS s.vbe_virtual_xres*3;
Bit8u *vidptr, *tileptr;
iWidth=BX_VGA_THIS s.vbe_xres;
iHeight=BX_VGA_THIS s.vbe_yres;
for (yc=0, yti = 0; yc<iHeight; yc+=Y_TILESIZE, yti++)
{
for (xc=0, xti = 0; xc<iWidth; xc+=X_TILESIZE, xti++)
{
if (GET_TILE_UPDATED (xti, yti))
{
for (r=0; r<Y_TILESIZE; r++)
{
pixely = yc + r;
// calc offsets into video and tile memory
bmp_ofs_y = pixely*width;
tile_ofs_y = r*X_TILESIZE*3;
// get offsets so that we do less calc in the inner loop
vidptr = &vidmem[bmp_ofs_y+xc*3];
tileptr = &tile[tile_ofs_y];
memmove(tileptr, vidptr, X_TILESIZE*3);
}
SET_TILE_UPDATED (xti, yti, 0);
bx_gui->graphics_tile_update(BX_VGA_THIS s.tile, xc, yc);
}
}
}
}
else if ((BX_VGA_THIS s.vbe_bpp == VBE_DISPI_BPP_15) ||
(BX_VGA_THIS s.vbe_bpp == VBE_DISPI_BPP_16))
{
Bit16u *vidmem = (Bit16u *)(&BX_VGA_THIS s.vbe_memory[BX_VGA_THIS s.vbe_virtual_start]);
Bit16u *tile = (Bit16u *)(BX_VGA_THIS s.tile);
Bit16u width = BX_VGA_THIS s.vbe_virtual_xres;
Bit16u *vidptr, *tileptr;
iWidth=BX_VGA_THIS s.vbe_xres;
iHeight=BX_VGA_THIS s.vbe_yres;
for (yc=0, yti = 0; yc<iHeight; yc+=Y_TILESIZE, yti++)
{
for (xc=0, xti = 0; xc<iWidth; xc+=X_TILESIZE, xti++)
{
if (GET_TILE_UPDATED (xti, yti))
{
for (r=0; r<Y_TILESIZE; r++)
{
pixely = yc + r;
// calc offsets into video and tile memory
bmp_ofs_y = pixely*width;
tile_ofs_y = r*X_TILESIZE;
// get offsets so that we do less calc in the inner loop
vidptr = &vidmem[bmp_ofs_y+xc];
tileptr = &tile[tile_ofs_y];
memmove(tileptr, vidptr, X_TILESIZE<<1);
}
SET_TILE_UPDATED (xti, yti, 0);
bx_gui->graphics_tile_update(BX_VGA_THIS s.tile, xc, yc);
}
}
}
}
else /* Update 8bpp mode */
{
Bit8u *vidmem = &BX_VGA_THIS s.vbe_memory[BX_VGA_THIS s.vbe_virtual_start];
Bit8u *tile = BX_VGA_THIS s.tile;
Bit16u width = BX_VGA_THIS s.vbe_virtual_xres;
Bit8u *vidptr, *tileptr;
iWidth=BX_VGA_THIS s.vbe_xres;
iHeight=BX_VGA_THIS s.vbe_yres;
for (yc=0, yti = 0; yc<iHeight; yc+=Y_TILESIZE, yti++)
{
for (xc=0, xti = 0; xc<iWidth; xc+=X_TILESIZE, xti++)
{
// If the tile has not been updated, copy it into the tile buffer for update
if (GET_TILE_UPDATED (xti, yti)) {
for (r=0; r<Y_TILESIZE; r++) {
// actual video y coord is tile_y + y
pixely = yc + r;
// calc offsets into video and tile memory
bmp_ofs_y = pixely*width;
tile_ofs_y = r*X_TILESIZE;
// get offsets so that we do less calc in the inner loop
vidptr = &vidmem[bmp_ofs_y+xc];
tileptr = &tile[tile_ofs_y];
memmove(tileptr, vidptr, X_TILESIZE);
}
SET_TILE_UPDATED (xti, yti, 0);
bx_gui->graphics_tile_update(BX_VGA_THIS s.tile, xc, yc);
}
}
}
}
old_iWidth = iWidth;
old_iHeight = iHeight;
BX_VGA_THIS s.vga_mem_updated = 0;
// after a vbe display update, don't try to do any 'normal vga' updates anymore
return;
}
#endif
// fields that effect the way video memory is serialized into screen output:
// GRAPHICS CONTROLLER:
// BX_VGA_THIS s.graphics_ctrl.shift_reg:
// 0: output data in standard VGA format or CGA-compatible 640x200 2 color
// graphics mode (mode 6)
// 1: output data in CGA-compatible 320x200 4 color graphics mode
// (modes 4 & 5)
// 2: output data 8 bits at a time from the 4 bit planes
// (mode 13 and variants like modeX)
// if (BX_VGA_THIS s.vga_mem_updated==0 || BX_VGA_THIS s.attribute_ctrl.video_enabled == 0)
if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha) {
Bit8u color;
unsigned bit_no, r, c, x, y;
unsigned long byte_offset, start_addr;
unsigned xc, yc, xti, yti;
start_addr = (BX_VGA_THIS s.CRTC.reg[0x0c] << 8) | BX_VGA_THIS s.CRTC.reg[0x0d];
//BX_DEBUG(("update: shiftreg=%u, chain4=%u, mapping=%u",
// (unsigned) BX_VGA_THIS s.graphics_ctrl.shift_reg,
// (unsigned) BX_VGA_THIS s.sequencer.chain_four,
// (unsigned) BX_VGA_THIS s.graphics_ctrl.memory_mapping);
determine_screen_dimensions(&iHeight, &iWidth);
if( (iWidth != old_iWidth) || (iHeight != old_iHeight) || (old_BPP > 8) ) {
bx_gui->dimension_update(iWidth, iHeight);
old_iWidth = iWidth;
old_iHeight = iHeight;
old_BPP = 8;
}
switch ( BX_VGA_THIS s.graphics_ctrl.shift_reg ) {
case 0:
Bit8u attribute, palette_reg_val, DAC_regno;
unsigned long line_compare;
if (BX_VGA_THIS s.graphics_ctrl.memory_mapping == 3) { // CGA 640x200x2
for (yc=0, yti=0; yc<iHeight; yc+=Y_TILESIZE, yti++) {
for (xc=0, xti=0; xc<iWidth; xc+=X_TILESIZE, xti++) {
if (GET_TILE_UPDATED (xti, yti)) {
for (r=0; r<Y_TILESIZE; r++) {
y = yc + r;
if (BX_VGA_THIS s.y_doublescan) y >>= 1;
for (c=0; c<X_TILESIZE; c++) {
x = xc + c;
/* 0 or 0x2000 */
byte_offset = start_addr + ((y & 1) << 13);
/* to the start of the line */
byte_offset += (320 / 4) * (y / 2);
/* to the byte start */
byte_offset += (x / 8);
bit_no = 7 - (x % 8);
palette_reg_val = (((BX_VGA_THIS s.vga_memory[byte_offset]) >> bit_no) & 1);
DAC_regno = BX_VGA_THIS s.attribute_ctrl.palette_reg[palette_reg_val];
BX_VGA_THIS s.tile[r*X_TILESIZE + c] = DAC_regno;
}
}
SET_TILE_UPDATED (xti, yti, 0);
bx_gui->graphics_tile_update(BX_VGA_THIS s.tile, xc, yc);
}
}
}
} else { // output data in serial fashion with each display plane
// output on its associated serial output. Standard EGA/VGA format
line_compare = BX_VGA_THIS s.line_compare;
if (BX_VGA_THIS s.y_doublescan) line_compare >>= 1;
for (yc=0, yti=0; yc<iHeight; yc+=Y_TILESIZE, yti++) {
for (xc=0, xti=0; xc<iWidth; xc+=X_TILESIZE, xti++) {
if (GET_TILE_UPDATED (xti, yti)) {
for (r=0; r<Y_TILESIZE; r++) {
y = yc + r;
if (BX_VGA_THIS s.y_doublescan) y >>= 1;
for (c=0; c<X_TILESIZE; c++) {
x = xc + c;
if (BX_VGA_THIS s.x_dotclockdiv2) x >>= 1;
bit_no = 7 - (x % 8);
if (y > line_compare) {
byte_offset = x / 8 +
((y - line_compare - 1) * BX_VGA_THIS s.line_offset);
} else {
byte_offset = start_addr + x / 8 +
(y * BX_VGA_THIS s.line_offset);
}
attribute =
(((BX_VGA_THIS s.vga_memory[0*65536 + byte_offset] >> bit_no) & 0x01) << 0) |
(((BX_VGA_THIS s.vga_memory[1*65536 + byte_offset] >> bit_no) & 0x01) << 1) |
(((BX_VGA_THIS s.vga_memory[2*65536 + byte_offset] >> bit_no) & 0x01) << 2) |
(((BX_VGA_THIS s.vga_memory[3*65536 + byte_offset] >> bit_no) & 0x01) << 3);
attribute &= BX_VGA_THIS s.attribute_ctrl.color_plane_enable;
// undocumented feature ???: colors 0..7 high intensity, colors 8..15 blinking
// using low/high intensity. Blinking is not implemented yet.
if (BX_VGA_THIS s.attribute_ctrl.mode_ctrl.blink_intensity) attribute ^= 0x08;
palette_reg_val = BX_VGA_THIS s.attribute_ctrl.palette_reg[attribute];
if (BX_VGA_THIS s.attribute_ctrl.mode_ctrl.internal_palette_size) {
// use 4 lower bits from palette register
// use 4 higher bits from color select register
// 16 banks of 16-color registers
DAC_regno = (palette_reg_val & 0x0f) |
(BX_VGA_THIS s.attribute_ctrl.color_select << 4);
}
else {
// use 6 lower bits from palette register
// use 2 higher bits from color select register
// 4 banks of 64-color registers
DAC_regno = (palette_reg_val & 0x3f) |
((BX_VGA_THIS s.attribute_ctrl.color_select & 0x0c) << 4);
}
// DAC_regno &= video DAC mask register ???
BX_VGA_THIS s.tile[r*X_TILESIZE + c] = DAC_regno;
}
}
SET_TILE_UPDATED (xti, yti, 0);
bx_gui->graphics_tile_update(BX_VGA_THIS s.tile, xc, yc);
}
}
}
}
break; // case 0
case 1: // output the data in a CGA-compatible 320x200 4 color graphics
// mode. (modes 4 & 5)
/* CGA 320x200x4 start */
for (yc=0, yti=0; yc<iHeight; yc+=Y_TILESIZE, yti++) {
for (xc=0, xti=0; xc<iWidth; xc+=X_TILESIZE, xti++) {
if (GET_TILE_UPDATED (xti, yti)) {
for (r=0; r<Y_TILESIZE; r++) {
y = yc + r;
if (BX_VGA_THIS s.y_doublescan) y >>= 1;
for (c=0; c<X_TILESIZE; c++) {
x = xc + c;
if (BX_VGA_THIS s.x_dotclockdiv2) x >>= 1;
/* 0 or 0x2000 */
byte_offset = start_addr + ((y & 1) << 13);
/* to the start of the line */
byte_offset += (320 / 4) * (y / 2);
/* to the byte start */
byte_offset += (x / 4);
attribute = 6 - 2*(x % 4);
palette_reg_val = (BX_VGA_THIS s.vga_memory[byte_offset]) >> attribute;
palette_reg_val &= 3;
DAC_regno = BX_VGA_THIS s.attribute_ctrl.palette_reg[palette_reg_val];
BX_VGA_THIS s.tile[r*X_TILESIZE + c] = DAC_regno;
}
}
SET_TILE_UPDATED (xti, yti, 0);
bx_gui->graphics_tile_update(BX_VGA_THIS s.tile, xc, yc);
}
}
}
/* CGA 320x200x4 end */
break; // case 1
case 2: // output the data eight bits at a time from the 4 bit plane
// (format for VGA mode 13 hex)
if ( BX_VGA_THIS s.sequencer.chain_four ) {
unsigned long pixely, pixelx, plane;
// bx_vga_dump_status();
if (BX_VGA_THIS s.misc_output.select_high_bank != 1)
BX_PANIC(("update: select_high_bank != 1"));
for (yc=0, yti=0; yc<iHeight; yc+=Y_TILESIZE, yti++) {
for (xc=0, xti=0; xc<iWidth; xc+=X_TILESIZE, xti++) {
if (GET_TILE_UPDATED (xti, yti)) {
for (r=0; r<Y_TILESIZE; r++) {
pixely = yc + r;
if (BX_VGA_THIS s.y_doublescan) pixely >>= 1;
for (c=0; c<X_TILESIZE; c++) {
pixelx = (xc + c) >> 1;
plane = (pixelx % 4);
byte_offset = start_addr + (plane * 65536) +
(pixely * BX_VGA_THIS s.line_offset) + (pixelx & ~0x03);
color = BX_VGA_THIS s.vga_memory[byte_offset];
BX_VGA_THIS s.tile[r*X_TILESIZE + c] = color;
}
}
SET_TILE_UPDATED (xti, yti, 0);
bx_gui->graphics_tile_update(BX_VGA_THIS s.tile, xc, yc);
}
}
}
}
else { // chain_four == 0, modeX
unsigned long pixely, pixelx, plane;
for (yc=0, yti=0; yc<iHeight; yc+=Y_TILESIZE, yti++) {
for (xc=0, xti=0; xc<iWidth; xc+=X_TILESIZE, xti++) {
if (GET_TILE_UPDATED (xti, yti)) {
for (r=0; r<Y_TILESIZE; r++) {
pixely = yc + r;
if (BX_VGA_THIS s.y_doublescan) pixely >>= 1;
for (c=0; c<X_TILESIZE; c++) {
pixelx = (xc + c) >> 1;
plane = (pixelx % 4);
byte_offset = (plane * 65536) +
(pixely * BX_VGA_THIS s.line_offset)
+ (pixelx >> 2);
color = BX_VGA_THIS s.vga_memory[start_addr + byte_offset];
BX_VGA_THIS s.tile[r*X_TILESIZE + c] = color;
}
}
SET_TILE_UPDATED (xti, yti, 0);
bx_gui->graphics_tile_update(BX_VGA_THIS s.tile, xc, yc);
}
}
}
}
break; // case 2
default:
BX_PANIC(("update: shift_reg == %u", (unsigned)
BX_VGA_THIS s.graphics_ctrl.shift_reg ));
}
BX_VGA_THIS s.vga_mem_updated = 0;
return;
}
else { // text mode
unsigned long start_address;
unsigned long cursor_address, cursor_x, cursor_y;
bx_vga_tminfo_t tm_info;
tm_info.start_address = 2*((BX_VGA_THIS s.CRTC.reg[12] << 8) +
BX_VGA_THIS s.CRTC.reg[13]);
tm_info.cs_start = BX_VGA_THIS s.CRTC.reg[0x0a] & 0x3f;
tm_info.cs_end = BX_VGA_THIS s.CRTC.reg[0x0b] & 0x1f;
tm_info.line_offset = BX_VGA_THIS s.CRTC.reg[0x13] << 2;
tm_info.line_compare = BX_VGA_THIS s.line_compare;
tm_info.h_panning = BX_VGA_THIS s.attribute_ctrl.horiz_pel_panning & 0x0f;
tm_info.v_panning = BX_VGA_THIS s.CRTC.reg[0x08] & 0x1f;
tm_info.line_graphics = BX_VGA_THIS s.attribute_ctrl.mode_ctrl.enable_line_graphics;
tm_info.split_hpanning = BX_VGA_THIS s.attribute_ctrl.mode_ctrl.pixel_panning_compat;
if ((BX_VGA_THIS s.sequencer.reg1 & 0x01) == 0) {
if (tm_info.h_panning == 8)
tm_info.h_panning = 0;
else
tm_info.h_panning++;
}
switch (BX_VGA_THIS s.graphics_ctrl.memory_mapping) {
case 0: // 128K @ A0000
case 1: // 64K @ A0000
iWidth = 8*80; // TODO: should use font size
iHeight = 16*25;
if( (iWidth != old_iWidth) || (iHeight != old_iHeight) || (old_BPP > 8) )
{
bx_gui->dimension_update(iWidth, iHeight, 16, 8);
old_iWidth = iWidth;
old_iHeight = iHeight;
old_BPP = 8;
}
/* pass old text snapshot & new VGA memory contents */
start_address = 0x0;
cursor_address = 2*((BX_VGA_THIS s.CRTC.reg[0x0e] << 8) +
BX_VGA_THIS s.CRTC.reg[0x0f]);
if (cursor_address < start_address) {
cursor_x = 0xffff;
cursor_y = 0xffff;
}
else {
cursor_x = ((cursor_address - start_address)/2) % 80;
cursor_y = ((cursor_address - start_address)/2) / 80;
}
bx_gui->text_update(BX_VGA_THIS s.text_snapshot,
&BX_VGA_THIS s.vga_memory[start_address],
cursor_x, cursor_y, tm_info, 25);
// screen updated, copy new VGA memory contents into text snapshot
memcpy(BX_VGA_THIS s.text_snapshot,
&BX_VGA_THIS s.vga_memory[start_address],
2*80*25);
BX_VGA_THIS s.vga_mem_updated = 0;
break;
case 2: // B0000 .. B7FFF
case 3: // B8000 .. BFFFF
unsigned VDE, MSL, rows, cWidth;
// Verticle Display End: find out how many lines are displayed
VDE = BX_VGA_THIS s.vertical_display_end;
// Maximum Scan Line: height of character cell
MSL = BX_VGA_THIS s.CRTC.reg[0x09] & 0x1f;
if (MSL == 0) {
BX_ERROR(("character height = 1, skipping text update"));
return;
}
if ((MSL == 1) && (BX_VGA_THIS s.CRTC.reg[0x06] == 100)) {
// emulated CGA graphics mode 160x100x16 colors
MSL = 3;
rows = 100;
cWidth = 8;
iWidth = cWidth * BX_VGA_THIS s.CRTC.reg[1];
iHeight = 400;
} else {
rows = (VDE+1)/(MSL+1);
if (rows > BX_MAX_TEXT_LINES)
BX_PANIC(("text rows>%d: %d",BX_MAX_TEXT_LINES,rows));
cWidth = ((BX_VGA_THIS s.sequencer.reg1 & 0x01) == 1) ? 8 : 9;
iWidth = cWidth * (BX_VGA_THIS s.CRTC.reg[1] + 1);
iHeight = VDE+1;
}
if( (iWidth != old_iWidth) || (iHeight != old_iHeight) || (MSL != old_MSL) || (old_BPP > 8) )
{
bx_gui->dimension_update(iWidth, iHeight, MSL+1, cWidth);
old_iWidth = iWidth;
old_iHeight = iHeight;
old_MSL = MSL;
old_BPP = 8;
}
// pass old text snapshot & new VGA memory contents
start_address = 2*((BX_VGA_THIS s.CRTC.reg[12] << 8) +
BX_VGA_THIS s.CRTC.reg[13]);
cursor_address = 2*((BX_VGA_THIS s.CRTC.reg[0x0e] << 8) +
BX_VGA_THIS s.CRTC.reg[0x0f]);
if (cursor_address < start_address) {
cursor_x = 0xffff;
cursor_y = 0xffff;
}
else {
cursor_x = ((cursor_address - start_address)/2) % (iWidth/cWidth);
cursor_y = ((cursor_address - start_address)/2) / (iWidth/cWidth);
}
bx_gui->text_update(BX_VGA_THIS s.text_snapshot,
&BX_VGA_THIS s.vga_memory[start_address],
cursor_x, cursor_y, tm_info, rows);
// screen updated, copy new VGA memory contents into text snapshot
memcpy(BX_VGA_THIS s.text_snapshot,
&BX_VGA_THIS s.vga_memory[start_address],
2*80*rows);
BX_VGA_THIS s.vga_mem_updated = 0;
break;
default:
BX_DEBUG(("update(): color text mode: mem map is %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.memory_mapping));
}
}
}
Bit8u
bx_vga_c::mem_read(Bit32u addr)
{
Bit32u offset;
#if BX_SUPPORT_VBE
// if in a vbe enabled mode, read from the vbe_memory
if ((BX_VGA_THIS s.vbe_enabled) && (BX_VGA_THIS s.vbe_bpp != VBE_DISPI_BPP_4))
{
return vbe_mem_read(addr);
}
#endif
#if defined(VGA_TRACE_FEATURE)
// BX_DEBUG(("8-bit memory read from %08x", addr));
#endif
#ifdef __OS2__
#if BX_PLUGINS
#error Fix the code for plugins
#endif
if ( bx_options.videomode == BX_VIDEO_DIRECT )
{
char value;
value = devices->mem->video[addr-0xA0000];
return value;
}
#endif
switch (BX_VGA_THIS s.graphics_ctrl.memory_mapping) {
case 1: // 0xA0000 .. 0xAFFFF
if (addr > 0xAFFFF) return 0xff;
offset = addr - 0xA0000;
break;
case 2: // 0xB0000 .. 0xB7FFF
if ((addr < 0xB0000) || (addr > 0xB7FFF)) return 0xff;
return BX_VGA_THIS s.vga_memory[addr - 0xB0000];
break;
case 3: // 0xB8000 .. 0xBFFFF
if (addr < 0xB8000) return 0xff;
return BX_VGA_THIS s.vga_memory[addr - 0xB8000];
break;
default: // 0xA0000 .. 0xBFFFF
return BX_VGA_THIS s.vga_memory[addr - 0xA0000];
}
// addr between 0xA0000 and 0xAFFFF
if ( BX_VGA_THIS s.sequencer.chain_four ) {
// Mode 13h: 320 x 200 256 color mode: chained pixel representation
return BX_VGA_THIS s.vga_memory[(offset & ~0x03) + (offset % 4)*65536];
}
/* addr between 0xA0000 and 0xAFFFF */
switch (BX_VGA_THIS s.graphics_ctrl.read_mode) {
case 0: /* read mode 0 */
BX_VGA_THIS s.graphics_ctrl.latch[0] = BX_VGA_THIS s.vga_memory[ offset];
BX_VGA_THIS s.graphics_ctrl.latch[1] = BX_VGA_THIS s.vga_memory[1*65536 + offset];
BX_VGA_THIS s.graphics_ctrl.latch[2] = BX_VGA_THIS s.vga_memory[2*65536 + offset];
BX_VGA_THIS s.graphics_ctrl.latch[3] = BX_VGA_THIS s.vga_memory[3*65536 + offset];
return(BX_VGA_THIS s.graphics_ctrl.latch[BX_VGA_THIS s.graphics_ctrl.read_map_select]);
break;
case 1: /* read mode 1 */
{
Bit8u color_compare, color_dont_care;
Bit8u latch0, latch1, latch2, latch3, retval;
color_compare = BX_VGA_THIS s.graphics_ctrl.color_compare & 0x0f;
color_dont_care = BX_VGA_THIS s.graphics_ctrl.color_dont_care & 0x0f;
latch0 = BX_VGA_THIS s.graphics_ctrl.latch[0] = BX_VGA_THIS s.vga_memory[ offset];
latch1 = BX_VGA_THIS s.graphics_ctrl.latch[1] = BX_VGA_THIS s.vga_memory[1*65536 + offset];
latch2 = BX_VGA_THIS s.graphics_ctrl.latch[2] = BX_VGA_THIS s.vga_memory[2*65536 + offset];
latch3 = BX_VGA_THIS s.graphics_ctrl.latch[3] = BX_VGA_THIS s.vga_memory[3*65536 + offset];
latch0 ^= ccdat[color_compare][0];
latch1 ^= ccdat[color_compare][1];
latch2 ^= ccdat[color_compare][2];
latch3 ^= ccdat[color_compare][3];
latch0 &= ccdat[color_dont_care][0];
latch1 &= ccdat[color_dont_care][1];
latch2 &= ccdat[color_dont_care][2];
latch3 &= ccdat[color_dont_care][3];
retval = ~(latch0 | latch1 | latch2 | latch3);
return retval;
}
break;
default:
return 0;
}
}
void
bx_vga_c::mem_write(Bit32u addr, Bit8u value)
{
Bit32u offset;
Bit8u new_val[4];
unsigned start_addr;
#if BX_SUPPORT_VBE
// if in a vbe enabled mode, write to the vbe_memory
if ((BX_VGA_THIS s.vbe_enabled) && (BX_VGA_THIS s.vbe_bpp != VBE_DISPI_BPP_4))
{
vbe_mem_write(addr,value);
return;
}
#endif
#if defined(VGA_TRACE_FEATURE)
// BX_DEBUG(("8-bit memory write to %08x = %02x", addr, value));
#endif
#ifdef __OS2__
#if BX_PLUGINS
#error Fix the code for plugins
#endif
if ( bx_options.videomode == BX_VIDEO_DIRECT )
{
devices->mem->video[addr-0xA0000] = value;
return;
}
#endif
switch (BX_VGA_THIS s.graphics_ctrl.memory_mapping) {
case 1: // 0xA0000 .. 0xAFFFF
if (addr > 0xAFFFF) return;
offset = addr - 0xA0000;
break;
case 2: // 0xB0000 .. 0xB7FFF
if ((addr < 0xB0000) || (addr > 0xB7FFF)) return;
offset = addr - 0xB0000;
break;
case 3: // 0xB8000 .. 0xBFFFF
if (addr < 0xB8000) return;
offset = addr - 0xB8000;
break;
default: // 0xA0000 .. 0xBFFFF
offset = addr - 0xA0000;
}
start_addr = (BX_VGA_THIS s.CRTC.reg[0x0c] << 8) | BX_VGA_THIS s.CRTC.reg[0x0d];
if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha) {
if (BX_VGA_THIS s.graphics_ctrl.memory_mapping == 3) { // 0xB8000 .. 0xBFFFF
unsigned x_tileno, x_tileno2, y_tileno;
/* CGA 320x200x4 / 640x200x2 start */
BX_VGA_THIS s.vga_memory[offset] = value;
offset -= start_addr;
if (offset>=0x2000) {
y_tileno = offset - 0x2000;
y_tileno /= (320/4);
y_tileno <<= 1; //2 * y_tileno;
y_tileno++;
x_tileno = (offset - 0x2000) % (320/4);
x_tileno <<= 2; //*= 4;
} else {
y_tileno = offset / (320/4);
y_tileno <<= 1; //2 * y_tileno;
x_tileno = offset % (320/4);
x_tileno <<= 2; //*=4;
}
x_tileno2=x_tileno;
if (BX_VGA_THIS s.graphics_ctrl.shift_reg==0) {
x_tileno*=2;
x_tileno2+=7;
} else {
x_tileno2+=3;
}
if (BX_VGA_THIS s.x_dotclockdiv2) {
x_tileno/=(X_TILESIZE/2);
x_tileno2/=(X_TILESIZE/2);
} else {
x_tileno/=X_TILESIZE;
x_tileno2/=X_TILESIZE;
}
if (BX_VGA_THIS s.y_doublescan) {
y_tileno/=(Y_TILESIZE/2);
} else {
y_tileno/=Y_TILESIZE;
}
BX_VGA_THIS s.vga_mem_updated = 1;
SET_TILE_UPDATED (x_tileno, y_tileno, 1);
if (x_tileno2!=x_tileno) {
SET_TILE_UPDATED (x_tileno2, y_tileno, 1);
}
return;
/* CGA 320x200x4 / 640x200x2 end */
}
else if (BX_VGA_THIS s.graphics_ctrl.memory_mapping != 1) {
BX_PANIC(("mem_write: graphics: mapping = %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.memory_mapping));
return;
}
if ( BX_VGA_THIS s.sequencer.chain_four ) {
unsigned x_tileno, y_tileno;
// 320 x 200 256 color mode: chained pixel representation
BX_VGA_THIS s.vga_memory[(offset & ~0x03) + (offset % 4)*65536] = value;
offset -= start_addr;
x_tileno = (offset % BX_VGA_THIS s.line_offset) / (X_TILESIZE/2);
if (BX_VGA_THIS s.y_doublescan) {
y_tileno = (offset / BX_VGA_THIS s.line_offset) / (Y_TILESIZE/2);
} else {
y_tileno = (offset / BX_VGA_THIS s.line_offset) / Y_TILESIZE;
}
BX_VGA_THIS s.vga_mem_updated = 1;
SET_TILE_UPDATED (x_tileno, y_tileno, 1);
return;
}
}
/* addr between 0xA0000 and 0xAFFFF */
switch (BX_VGA_THIS s.graphics_ctrl.write_mode) {
unsigned i;
case 0: /* write mode 0 */
{
const Bit8u bitmask = BX_VGA_THIS s.graphics_ctrl.bitmask;
const Bit8u set_reset = BX_VGA_THIS s.graphics_ctrl.set_reset;
const Bit8u enable_set_reset = BX_VGA_THIS s.graphics_ctrl.enable_set_reset;
/* perform rotate on CPU data in case its needed */
if (BX_VGA_THIS s.graphics_ctrl.data_rotate) {
value = (value >> BX_VGA_THIS s.graphics_ctrl.data_rotate) |
(value << (8 - BX_VGA_THIS s.graphics_ctrl.data_rotate));
}
new_val[0] = BX_VGA_THIS s.graphics_ctrl.latch[0] & ~bitmask;
new_val[1] = BX_VGA_THIS s.graphics_ctrl.latch[1] & ~bitmask;
new_val[2] = BX_VGA_THIS s.graphics_ctrl.latch[2] & ~bitmask;
new_val[3] = BX_VGA_THIS s.graphics_ctrl.latch[3] & ~bitmask;
switch (BX_VGA_THIS s.graphics_ctrl.raster_op) {
case 0: // replace
new_val[0] |= ((enable_set_reset & 1)
? ((set_reset & 1) ? bitmask : 0)
: (value & bitmask));
new_val[1] |= ((enable_set_reset & 2)
? ((set_reset & 2) ? bitmask : 0)
: (value & bitmask));
new_val[2] |= ((enable_set_reset & 4)
? ((set_reset & 4) ? bitmask : 0)
: (value & bitmask));
new_val[3] |= ((enable_set_reset & 8)
? ((set_reset & 8) ? bitmask : 0)
: (value & bitmask));
break;
case 1: // AND
new_val[0] |= ((enable_set_reset & 1)
? ((set_reset & 1)
? (BX_VGA_THIS s.graphics_ctrl.latch[0] & bitmask)
: 0)
: (value & BX_VGA_THIS s.graphics_ctrl.latch[0]) & bitmask);
new_val[1] |= ((enable_set_reset & 2)
? ((set_reset & 2)
? (BX_VGA_THIS s.graphics_ctrl.latch[1] & bitmask)
: 0)
: (value & BX_VGA_THIS s.graphics_ctrl.latch[1]) & bitmask);
new_val[2] |= ((enable_set_reset & 4)
? ((set_reset & 4)
? (BX_VGA_THIS s.graphics_ctrl.latch[2] & bitmask)
: 0)
: (value & BX_VGA_THIS s.graphics_ctrl.latch[2]) & bitmask);
new_val[3] |= ((enable_set_reset & 8)
? ((set_reset & 8)
? (BX_VGA_THIS s.graphics_ctrl.latch[3] & bitmask)
: 0)
: (value & BX_VGA_THIS s.graphics_ctrl.latch[3]) & bitmask);
break;
case 2: // OR
new_val[0]
|= ((enable_set_reset & 1)
? ((set_reset & 1)
? bitmask
: (BX_VGA_THIS s.graphics_ctrl.latch[0] & bitmask))
: ((value | BX_VGA_THIS s.graphics_ctrl.latch[0]) & bitmask));
new_val[1]
|= ((enable_set_reset & 2)
? ((set_reset & 2)
? bitmask
: (BX_VGA_THIS s.graphics_ctrl.latch[1] & bitmask))
: ((value | BX_VGA_THIS s.graphics_ctrl.latch[1]) & bitmask));
new_val[2]
|= ((enable_set_reset & 4)
? ((set_reset & 4)
? bitmask
: (BX_VGA_THIS s.graphics_ctrl.latch[2] & bitmask))
: ((value | BX_VGA_THIS s.graphics_ctrl.latch[2]) & bitmask));
new_val[3]
|= ((enable_set_reset & 8)
? ((set_reset & 8)
? bitmask
: (BX_VGA_THIS s.graphics_ctrl.latch[3] & bitmask))
: ((value | BX_VGA_THIS s.graphics_ctrl.latch[3]) & bitmask));
break;
case 3: // XOR
new_val[0]
|= ((enable_set_reset & 1)
? ((set_reset & 1)
? (~BX_VGA_THIS s.graphics_ctrl.latch[0] & bitmask)
: (BX_VGA_THIS s.graphics_ctrl.latch[0] & bitmask))
: (value ^ BX_VGA_THIS s.graphics_ctrl.latch[0]) & bitmask);
new_val[1]
|= ((enable_set_reset & 2)
? ((set_reset & 2)
? (~BX_VGA_THIS s.graphics_ctrl.latch[1] & bitmask)
: (BX_VGA_THIS s.graphics_ctrl.latch[1] & bitmask))
: (value ^ BX_VGA_THIS s.graphics_ctrl.latch[1]) & bitmask);
new_val[2]
|= ((enable_set_reset & 4)
? ((set_reset & 4)
? (~BX_VGA_THIS s.graphics_ctrl.latch[2] & bitmask)
: (BX_VGA_THIS s.graphics_ctrl.latch[2] & bitmask))
: (value ^ BX_VGA_THIS s.graphics_ctrl.latch[2]) & bitmask);
new_val[3]
|= ((enable_set_reset & 8)
? ((set_reset & 8)
? (~BX_VGA_THIS s.graphics_ctrl.latch[3] & bitmask)
: (BX_VGA_THIS s.graphics_ctrl.latch[3] & bitmask))
: (value ^ BX_VGA_THIS s.graphics_ctrl.latch[3]) & bitmask);
break;
default:
BX_PANIC(("vga_mem_write: write mode 0: op = %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.raster_op));
}
}
break;
case 1: /* write mode 1 */
for (i=0; i<4; i++ ) {
new_val[i] = BX_VGA_THIS s.graphics_ctrl.latch[i];
}
break;
case 2: /* write mode 2 */
{
const Bit8u bitmask = BX_VGA_THIS s.graphics_ctrl.bitmask;
new_val[0] = BX_VGA_THIS s.graphics_ctrl.latch[0] & ~bitmask;
new_val[1] = BX_VGA_THIS s.graphics_ctrl.latch[1] & ~bitmask;
new_val[2] = BX_VGA_THIS s.graphics_ctrl.latch[2] & ~bitmask;
new_val[3] = BX_VGA_THIS s.graphics_ctrl.latch[3] & ~bitmask;
switch (BX_VGA_THIS s.graphics_ctrl.raster_op) {
case 0: // write
new_val[0] |= (value & 1) ? bitmask : 0;
new_val[1] |= (value & 2) ? bitmask : 0;
new_val[2] |= (value & 4) ? bitmask : 0;
new_val[3] |= (value & 8) ? bitmask : 0;
break;
case 1: // AND
new_val[0] |= (value & 1)
? (BX_VGA_THIS s.graphics_ctrl.latch[0] & bitmask)
: 0;
new_val[1] |= (value & 2)
? (BX_VGA_THIS s.graphics_ctrl.latch[1] & bitmask)
: 0;
new_val[2] |= (value & 4)
? (BX_VGA_THIS s.graphics_ctrl.latch[2] & bitmask)
: 0;
new_val[3] |= (value & 8)
? (BX_VGA_THIS s.graphics_ctrl.latch[3] & bitmask)
: 0;
break;
case 2: // OR
new_val[0] |= (value & 1)
? bitmask
: (BX_VGA_THIS s.graphics_ctrl.latch[0] & bitmask);
new_val[1] |= (value & 2)
? bitmask
: (BX_VGA_THIS s.graphics_ctrl.latch[1] & bitmask);
new_val[2] |= (value & 4)
? bitmask
: (BX_VGA_THIS s.graphics_ctrl.latch[2] & bitmask);
new_val[3] |= (value & 8)
? bitmask
: (BX_VGA_THIS s.graphics_ctrl.latch[3] & bitmask);
break;
case 3: // XOR
new_val[0] |= (value & 1)
? (~BX_VGA_THIS s.graphics_ctrl.latch[0] & bitmask)
: (BX_VGA_THIS s.graphics_ctrl.latch[0] & bitmask);
new_val[1] |= (value & 2)
? (~BX_VGA_THIS s.graphics_ctrl.latch[1] & bitmask)
: (BX_VGA_THIS s.graphics_ctrl.latch[1] & bitmask);
new_val[2] |= (value & 4)
? (~BX_VGA_THIS s.graphics_ctrl.latch[2] & bitmask)
: (BX_VGA_THIS s.graphics_ctrl.latch[2] & bitmask);
new_val[3] |= (value & 8)
? (~BX_VGA_THIS s.graphics_ctrl.latch[3] & bitmask)
: (BX_VGA_THIS s.graphics_ctrl.latch[3] & bitmask);
break;
}
}
break;
case 3: /* write mode 3 */
{
const Bit8u bitmask = BX_VGA_THIS s.graphics_ctrl.bitmask & value;
const Bit8u set_reset = BX_VGA_THIS s.graphics_ctrl.set_reset;
/* perform rotate on CPU data */
if (BX_VGA_THIS s.graphics_ctrl.data_rotate) {
value = (value >> BX_VGA_THIS s.graphics_ctrl.data_rotate) |
(value << (8 - BX_VGA_THIS s.graphics_ctrl.data_rotate));
}
new_val[0] = BX_VGA_THIS s.graphics_ctrl.latch[0] & ~bitmask;
new_val[1] = BX_VGA_THIS s.graphics_ctrl.latch[1] & ~bitmask;
new_val[2] = BX_VGA_THIS s.graphics_ctrl.latch[2] & ~bitmask;
new_val[3] = BX_VGA_THIS s.graphics_ctrl.latch[3] & ~bitmask;
value &= bitmask;
switch (BX_VGA_THIS s.graphics_ctrl.raster_op) {
case 0: // write
new_val[0] |= (set_reset & 1) ? value : 0;
new_val[1] |= (set_reset & 2) ? value : 0;
new_val[2] |= (set_reset & 4) ? value : 0;
new_val[3] |= (set_reset & 8) ? value : 0;
break;
case 1: // AND
new_val[0] |= ((set_reset & 1) ? value : 0)
& BX_VGA_THIS s.graphics_ctrl.latch[0];
new_val[1] |= ((set_reset & 2) ? value : 0)
& BX_VGA_THIS s.graphics_ctrl.latch[1];
new_val[2] |= ((set_reset & 4) ? value : 0)
& BX_VGA_THIS s.graphics_ctrl.latch[2];
new_val[3] |= ((set_reset & 8) ? value : 0)
& BX_VGA_THIS s.graphics_ctrl.latch[3];
break;
case 2: // OR
new_val[0] |= ((set_reset & 1) ? value : 0)
| BX_VGA_THIS s.graphics_ctrl.latch[0];
new_val[1] |= ((set_reset & 2) ? value : 0)
| BX_VGA_THIS s.graphics_ctrl.latch[1];
new_val[2] |= ((set_reset & 4) ? value : 0)
| BX_VGA_THIS s.graphics_ctrl.latch[2];
new_val[3] |= ((set_reset & 8) ? value : 0)
| BX_VGA_THIS s.graphics_ctrl.latch[3];
break;
case 3: // XOR
new_val[0] |= ((set_reset & 1) ? value : 0)
^ BX_VGA_THIS s.graphics_ctrl.latch[0];
new_val[1] |= ((set_reset & 2) ? value : 0)
^ BX_VGA_THIS s.graphics_ctrl.latch[1];
new_val[2] |= ((set_reset & 4) ? value : 0)
^ BX_VGA_THIS s.graphics_ctrl.latch[2];
new_val[3] |= ((set_reset & 8) ? value : 0)
^ BX_VGA_THIS s.graphics_ctrl.latch[3];
break;
}
}
break;
default:
BX_PANIC(("vga_mem_write: write mode %u ?",
(unsigned) BX_VGA_THIS s.graphics_ctrl.write_mode));
}
if (BX_VGA_THIS s.sequencer.map_mask & 0x0f) {
BX_VGA_THIS s.vga_mem_updated = 1;
if (BX_VGA_THIS s.sequencer.map_mask_bit[0])
BX_VGA_THIS s.vga_memory[0*65536 + offset] = new_val[0];
if (BX_VGA_THIS s.sequencer.map_mask_bit[1])
BX_VGA_THIS s.vga_memory[1*65536 + offset] = new_val[1];
if (BX_VGA_THIS s.sequencer.map_mask_bit[2]) {
if ((!BX_VGA_THIS s.graphics_ctrl.graphics_alpha) &&
((offset & 0xe000) == BX_VGA_THIS s.charmap_address)) {
bx_gui->set_text_charbyte((offset & 0x1fff), new_val[2]);
}
BX_VGA_THIS s.vga_memory[2*65536 + offset] = new_val[2];
}
if (BX_VGA_THIS s.sequencer.map_mask_bit[3])
BX_VGA_THIS s.vga_memory[3*65536 + offset] = new_val[3];
unsigned x_tileno, y_tileno;
if (BX_VGA_THIS s.graphics_ctrl.shift_reg == 2) {
offset -= start_addr;
x_tileno = (offset % BX_VGA_THIS s.line_offset) * 4 / (X_TILESIZE / 2);
if (BX_VGA_THIS s.y_doublescan) {
y_tileno = (offset / BX_VGA_THIS s.line_offset) / (Y_TILESIZE / 2);
} else {
y_tileno = (offset / BX_VGA_THIS s.line_offset) / Y_TILESIZE;
}
SET_TILE_UPDATED (x_tileno, y_tileno, 1);
} else {
if (BX_VGA_THIS s.line_compare < BX_VGA_THIS s.vertical_display_end) {
if (BX_VGA_THIS s.x_dotclockdiv2) {
x_tileno = (offset % BX_VGA_THIS s.line_offset) / (X_TILESIZE / 16);
} else {
x_tileno = (offset % BX_VGA_THIS s.line_offset) / (X_TILESIZE / 8);
}
if (BX_VGA_THIS s.y_doublescan) {
y_tileno = ((offset / BX_VGA_THIS s.line_offset) * 2 + BX_VGA_THIS s.line_compare + 1) / Y_TILESIZE;
} else {
y_tileno = ((offset / BX_VGA_THIS s.line_offset) + BX_VGA_THIS s.line_compare + 1) / Y_TILESIZE;
}
SET_TILE_UPDATED (x_tileno, y_tileno, 1);
}
if (offset >= start_addr) {
offset -= start_addr;
if (BX_VGA_THIS s.x_dotclockdiv2) {
x_tileno = (offset % BX_VGA_THIS s.line_offset) / (X_TILESIZE / 16);
} else {
x_tileno = (offset % BX_VGA_THIS s.line_offset) / (X_TILESIZE / 8);
}
if (BX_VGA_THIS s.y_doublescan) {
y_tileno = (offset / BX_VGA_THIS s.line_offset) / (Y_TILESIZE / 2);
} else {
y_tileno = (offset / BX_VGA_THIS s.line_offset) / Y_TILESIZE;
}
SET_TILE_UPDATED (x_tileno, y_tileno, 1);
}
}
}
}
void
bx_vga_c::get_text_snapshot(Bit8u **text_snapshot, unsigned *txHeight,
unsigned *txWidth)
{
unsigned VDE, MSL;
if (!BX_VGA_THIS s.graphics_ctrl.graphics_alpha) {
*text_snapshot = &BX_VGA_THIS s.text_snapshot[0];
VDE = BX_VGA_THIS s.vertical_display_end;
MSL = BX_VGA_THIS s.CRTC.reg[0x09] & 0x1f;
*txHeight = (VDE+1)/(MSL+1);
*txWidth = BX_VGA_THIS s.CRTC.reg[1] + 1;
} else {
*txHeight = 0;
*txWidth = 0;
}
}
Bit8u
bx_vga_c::get_actl_palette_idx(Bit8u index)
{
return BX_VGA_THIS s.attribute_ctrl.palette_reg[index];
}
void
bx_vga_c::dump_status(void)
{
BX_INFO(("s.misc_output.color_emulation = %u",
(unsigned) BX_VGA_THIS s.misc_output.color_emulation));
BX_INFO(("s.misc_output.enable_ram = %u",
(unsigned) BX_VGA_THIS s.misc_output.enable_ram));
BX_INFO(("s.misc_output.clock_select = %u",
(unsigned) BX_VGA_THIS s.misc_output.clock_select));
if (BX_VGA_THIS s.misc_output.clock_select == 0)
BX_INFO((" 25Mhz 640 horiz pixel clock"));
else
BX_INFO((" 28Mhz 720 horiz pixel clock"));
BX_INFO(("s.misc_output.select_high_bank = %u",
(unsigned) BX_VGA_THIS s.misc_output.select_high_bank));
BX_INFO(("s.misc_output.horiz_sync_pol = %u",
(unsigned) BX_VGA_THIS s.misc_output.horiz_sync_pol));
BX_INFO(("s.misc_output.vert_sync_pol = %u",
(unsigned) BX_VGA_THIS s.misc_output.vert_sync_pol));
switch ( (BX_VGA_THIS s.misc_output.vert_sync_pol << 1) |
BX_VGA_THIS s.misc_output.horiz_sync_pol ) {
case 0: BX_INFO((" (reserved")); break;
case 1: BX_INFO((" 400 lines")); break;
case 2: BX_INFO((" 350 lines")); break;
case 3: BX_INFO((" 480 lines")); break;
default: BX_INFO((" ???"));
}
BX_INFO(("s.graphics_ctrl.odd_even = %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.odd_even));
BX_INFO(("s.graphics_ctrl.chain_odd_even = %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.chain_odd_even));
BX_INFO(("s.graphics_ctrl.shift_reg = %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.shift_reg));
BX_INFO(("s.graphics_ctrl.graphics_alpha = %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.graphics_alpha));
BX_INFO(("s.graphics_ctrl.memory_mapping = %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.memory_mapping));
switch (BX_VGA_THIS s.graphics_ctrl.memory_mapping) {
case 0: BX_INFO((" A0000-BFFFF")); break;
case 1: BX_INFO((" A0000-AFFFF")); break;
case 2: BX_INFO((" B0000-B7FFF")); break;
case 3: BX_INFO((" B8000-BFFFF")); break;
default: BX_INFO((" ???"));
}
BX_INFO(("s.sequencer.extended_mem = %u",
(unsigned) BX_VGA_THIS s.sequencer.extended_mem));
BX_INFO(("s.sequencer.odd_even = %u (inverted)",
(unsigned) BX_VGA_THIS s.sequencer.odd_even));
BX_INFO(("s.sequencer.chain_four = %u",
(unsigned) BX_VGA_THIS s.sequencer.chain_four));
BX_INFO(("s.attribute_ctrl.video_enabled = %u",
(unsigned) BX_VGA_THIS s.attribute_ctrl.video_enabled));
BX_INFO(("s.attribute_ctrl.mode_ctrl.graphics_alpha = %u",
(unsigned) BX_VGA_THIS s.attribute_ctrl.mode_ctrl.graphics_alpha));
BX_INFO(("s.attribute_ctrl.mode_ctrl.display_type = %u",
(unsigned) BX_VGA_THIS s.attribute_ctrl.mode_ctrl.display_type));
BX_INFO(("s.attribute_ctrl.mode_ctrl.internal_palette_size = %u",
(unsigned) BX_VGA_THIS s.attribute_ctrl.mode_ctrl.internal_palette_size));
BX_INFO(("s.attribute_ctrl.mode_ctrl.pixel_clock_select = %u",
(unsigned) BX_VGA_THIS s.attribute_ctrl.mode_ctrl.pixel_clock_select));
}
void
bx_vga_c::redraw_area(unsigned x0, unsigned y0, unsigned width,
unsigned height)
{
unsigned xi, yi, x1, y1, xmax, ymax;
BX_VGA_THIS s.vga_mem_updated = 1;
#if BX_SUPPORT_VBE
if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha || BX_VGA_THIS s.vbe_enabled) {
#else
if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha) {
#endif
// graphics mode
x1 = x0 + width - 1;
y1 = y0 + height - 1;
xmax = old_iWidth;
ymax = old_iHeight;
#if BX_SUPPORT_VBE
if (BX_VGA_THIS s.vbe_enabled) {
xmax = BX_VGA_THIS s.vbe_xres;
ymax = BX_VGA_THIS s.vbe_yres;
}
#endif
for (yi=0; yi<ymax; yi+=Y_TILESIZE) {
for (xi=0; xi<xmax; xi+=X_TILESIZE) {
// is redraw rectangle outside x boundaries of this tile?
if (x1 < xi) continue;
if (x0 > (xi+X_TILESIZE-1)) continue;
// is redraw rectangle outside y boundaries of this tile?
if (y1 < yi) continue;
if (y0 > (yi+Y_TILESIZE-1)) continue;
unsigned xti = xi/X_TILESIZE;
unsigned yti = yi/Y_TILESIZE;
SET_TILE_UPDATED (xti, yti, 1);
}
}
}
else {
// text mode
memset(BX_VGA_THIS s.text_snapshot, 0,
sizeof(BX_VGA_THIS s.text_snapshot));
}
}
#if BX_SUPPORT_VBE
Bit8u BX_CPP_AttrRegparmN(1)
bx_vga_c::vbe_mem_read(Bit32u addr)
{
Bit32u offset;
if (addr >= VBE_DISPI_LFB_PHYSICAL_ADDRESS)
{
// LFB read
offset = addr - VBE_DISPI_LFB_PHYSICAL_ADDRESS;
}
else
{
// banked mode read
offset = BX_VGA_THIS s.vbe_bank*65536 + addr - 0xA0000;
}
// check for out of memory read
if (offset > VBE_DISPI_TOTAL_VIDEO_MEMORY_BYTES)
return 0;
return (BX_VGA_THIS s.vbe_memory[offset]);
}
void BX_CPP_AttrRegparmN(2)
bx_vga_c::vbe_mem_write(Bit32u addr, Bit8u value)
{
Bit32u offset;
unsigned x_tileno, y_tileno;
if (BX_VGA_THIS s.vbe_lfb_enabled)
{
if (addr >= VBE_DISPI_LFB_PHYSICAL_ADDRESS)
{
// LFB write
offset = addr - VBE_DISPI_LFB_PHYSICAL_ADDRESS;
}
else
{
// banked mode write while in LFB mode -> ignore
return;
}
}
else
{
if (addr < VBE_DISPI_LFB_PHYSICAL_ADDRESS)
{
// banked mode write
offset = (BX_VGA_THIS s.vbe_bank*65536) + (addr - 0xA0000);
}
else
{
// LFB write while in banked mode -> ignore
return;
}
}
// check for out of memory write
if (offset < VBE_DISPI_TOTAL_VIDEO_MEMORY_BYTES)
{
BX_VGA_THIS s.vbe_memory[offset]=value;
}
else
{
// make sure we don't flood the logfile
static int count=0;
if (count<100)
{
count ++;
BX_INFO(("VBE_mem_write out of video memory write at %x",offset));
}
}
offset-=BX_VGA_THIS s.vbe_virtual_start;
// only update the UI when writing 'onscreen'
if (offset < BX_VGA_THIS s.vbe_visable_screen_size)
{
y_tileno = ((offset / BX_VGA_THIS s.vbe_bpp_multiplier) / BX_VGA_THIS s.vbe_virtual_xres) / Y_TILESIZE;
x_tileno = ((offset / BX_VGA_THIS s.vbe_bpp_multiplier) % BX_VGA_THIS s.vbe_virtual_xres) / X_TILESIZE;
if ((y_tileno < BX_NUM_Y_TILES) && (x_tileno < BX_NUM_X_TILES))
{
BX_VGA_THIS s.vga_mem_updated = 1;
SET_TILE_UPDATED (x_tileno, y_tileno, 1);
}
}
}
Bit32u
bx_vga_c::vbe_read_handler(void *this_ptr, Bit32u address, unsigned io_len)
{
#if !BX_USE_VGA_SMF
bx_vga_c *class_ptr = (bx_vga_c *) this_ptr;
return( class_ptr->vbe_read(address, io_len) );
}
Bit32u
bx_vga_c::vbe_read(Bit32u address, unsigned io_len)
{
#else
UNUSED(this_ptr);
#endif // !BX_USE_VGA_SMF
// BX_INFO(("VBE_read %x (len %x)", address, io_len));
if ((address==VBE_DISPI_IOPORT_INDEX) ||
(address==VBE_DISPI_IOPORT_INDEX_OLD))
{
// index register
return (Bit32u) BX_VGA_THIS s.vbe_curindex;
}
else
{
// data register read
switch (BX_VGA_THIS s.vbe_curindex)
{
case VBE_DISPI_INDEX_ID: // Display Interface ID check
{
return BX_VGA_THIS s.vbe_cur_dispi;
} break;
case VBE_DISPI_INDEX_XRES: // x resolution
{
if (BX_VGA_THIS s.vbe_get_capabilities) {
return BX_VGA_THIS s.vbe_max_xres;
} else {
return BX_VGA_THIS s.vbe_xres;
}
} break;
case VBE_DISPI_INDEX_YRES: // y resolution
{
if (BX_VGA_THIS s.vbe_get_capabilities) {
return BX_VGA_THIS s.vbe_max_yres;
} else {
return BX_VGA_THIS s.vbe_yres;
}
} break;
case VBE_DISPI_INDEX_BPP: // bpp
{
if (BX_VGA_THIS s.vbe_get_capabilities) {
return BX_VGA_THIS s.vbe_max_bpp;
} else {
return BX_VGA_THIS s.vbe_bpp;
}
} break;
case VBE_DISPI_INDEX_ENABLE: // vbe enabled
{
return BX_VGA_THIS s.vbe_enabled |
(BX_VGA_THIS s.vbe_get_capabilities << 1);
} break;
case VBE_DISPI_INDEX_BANK: // current bank
{
return BX_VGA_THIS s.vbe_bank;
} break;
case VBE_DISPI_INDEX_X_OFFSET:
{
return BX_VGA_THIS s.vbe_offset_x;
} break;
case VBE_DISPI_INDEX_Y_OFFSET:
{
return BX_VGA_THIS s.vbe_offset_y;
} break;
case VBE_DISPI_INDEX_VIRT_WIDTH:
{
return BX_VGA_THIS s.vbe_virtual_xres;
} break;
case VBE_DISPI_INDEX_VIRT_HEIGHT:
{
return BX_VGA_THIS s.vbe_virtual_yres;
} break;
default:
{
BX_PANIC(("VBE unknown data read index 0x%x",BX_VGA_THIS s.vbe_curindex));
} break;
}
}
BX_PANIC(("VBE_read shouldn't reach this"));
return 0; /* keep compiler happy */
}
void
bx_vga_c::vbe_write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
{
#if !BX_USE_VGA_SMF
bx_vga_c *class_ptr = (bx_vga_c *) this_ptr;
class_ptr->vbe_write(address, value, io_len);
}
Bit32u
bx_vga_c::vbe_write(Bit32u address, Bit32u value, unsigned io_len)
{
#else
UNUSED(this_ptr);
#endif
// BX_INFO(("VBE_write %x = %x (len %x)", address, value, io_len));
switch(address)
{
// index register
case VBE_DISPI_IOPORT_INDEX:
// legacy index register
case VBE_DISPI_IOPORT_INDEX_OLD:
BX_VGA_THIS s.vbe_curindex = (Bit16u) value;
break;
// data register
// FIXME: maybe do some 'sanity' checks on received data?
case VBE_DISPI_IOPORT_DATA:
// legacy data register
case VBE_DISPI_IOPORT_DATA_OLD:
switch (BX_VGA_THIS s.vbe_curindex)
{
case VBE_DISPI_INDEX_ID: // Display Interface ID check
{
if ( (value == VBE_DISPI_ID0) ||
(value == VBE_DISPI_ID1) ||
(value == VBE_DISPI_ID2) ||
(value == VBE_DISPI_ID3) )
{
// allow backwards compatible with previous dispi bioses
BX_VGA_THIS s.vbe_cur_dispi=value;
}
else
{
BX_PANIC(("VBE unknown Display Interface %x",value));
}
// make sure we don't flood the logfile
static int count=0;
if (count < 100)
{
count++;
BX_INFO(("VBE known Display Interface %x",value));
}
} break;
case VBE_DISPI_INDEX_XRES: // set xres
{
// check that we don't set xres during vbe enabled
if (!BX_VGA_THIS s.vbe_enabled)
{
// check for within max xres range
if (value <= VBE_DISPI_MAX_XRES)
{
BX_VGA_THIS s.vbe_xres=(Bit16u) value;
BX_INFO(("VBE set xres (%d)",value));
}
else
{
BX_INFO(("VBE set xres more then max xres (%d)",value));
}
}
else
{
BX_INFO(("VBE set xres during vbe enabled!"));
}
} break;
case VBE_DISPI_INDEX_YRES: // set yres
{
// check that we don't set yres during vbe enabled
if (!BX_VGA_THIS s.vbe_enabled)
{
// check for within max yres range
if (value <= VBE_DISPI_MAX_YRES)
{
BX_VGA_THIS s.vbe_yres=(Bit16u) value;
BX_INFO(("VBE set yres (%d)",value));
}
else
{
BX_INFO(("VBE set yres more then max yres (%d)",value));
}
}
else
{
BX_INFO(("VBE set yres during vbe enabled!"));
}
} break;
case VBE_DISPI_INDEX_BPP: // set bpp
{
// check that we don't set bpp during vbe enabled
if (!BX_VGA_THIS s.vbe_enabled)
{
// for backward compatiblity
if (value == 0) value = VBE_DISPI_BPP_8;
// check for correct bpp range
if ((value == VBE_DISPI_BPP_4) || (value == VBE_DISPI_BPP_8) || (value == VBE_DISPI_BPP_15) ||
(value == VBE_DISPI_BPP_16) || (value == VBE_DISPI_BPP_24) || (value == VBE_DISPI_BPP_32))
{
BX_VGA_THIS s.vbe_bpp=(Bit16u) value;
BX_INFO(("VBE set bpp (%d)",value));
}
else
{
BX_INFO(("VBE set bpp with unknown bpp (%d)",value));
}
}
else
{
BX_INFO(("VBE set bpp during vbe enabled!"));
}
} break;
case VBE_DISPI_INDEX_BANK: // set bank
{
value=value & 0xff ; // FIXME lobyte = vbe bank A?
// check for max bank nr
if (value < (VBE_DISPI_TOTAL_VIDEO_MEMORY_KB /64))
{
if (!BX_VGA_THIS s.vbe_lfb_enabled)
{
BX_DEBUG(("VBE set bank to %d", value));
BX_VGA_THIS s.vbe_bank=value;
}
else
{
BX_ERROR(("VBE set bank in LFB mode ignored"));
}
}
else
{
BX_INFO(("VBE set invalid bank (%d)",value));
}
} break;
case VBE_DISPI_INDEX_ENABLE: // enable video
{
if (value & VBE_DISPI_ENABLED)
{
if (BX_VGA_THIS s.vbe_enabled) break;
unsigned depth=0;
// setup virtual resolution to be the same as current reso
BX_VGA_THIS s.vbe_virtual_yres=BX_VGA_THIS s.vbe_yres;
BX_VGA_THIS s.vbe_virtual_xres=BX_VGA_THIS s.vbe_xres;
// reset offset
BX_VGA_THIS s.vbe_offset_x=0;
BX_VGA_THIS s.vbe_offset_y=0;
BX_VGA_THIS s.vbe_virtual_start=0;
switch((BX_VGA_THIS s.vbe_bpp))
{
// Default pixel sizes
case VBE_DISPI_BPP_8:
BX_VGA_THIS s.vbe_bpp_multiplier = 1;
BX_VGA_THIS s.vbe_line_byte_width = BX_VGA_THIS s.vbe_virtual_xres;
BX_VGA_THIS s.vbe_visable_screen_size = ((BX_VGA_THIS s.vbe_xres) * (BX_VGA_THIS s.vbe_yres));
depth=8;
break;
case VBE_DISPI_BPP_4:
BX_VGA_THIS s.vbe_bpp_multiplier = 1;
BX_VGA_THIS s.vbe_line_byte_width = BX_VGA_THIS s.vbe_virtual_xres;
BX_VGA_THIS s.vbe_visable_screen_size = ((BX_VGA_THIS s.vbe_xres) * (BX_VGA_THIS s.vbe_yres));
depth=4;
break;
case VBE_DISPI_BPP_15:
BX_VGA_THIS s.vbe_bpp_multiplier = 2;
BX_VGA_THIS s.vbe_line_byte_width = BX_VGA_THIS s.vbe_virtual_xres * 2;
BX_VGA_THIS s.vbe_visable_screen_size = ((BX_VGA_THIS s.vbe_xres) * (BX_VGA_THIS s.vbe_yres)) * 2;
depth=15;
break;
case VBE_DISPI_BPP_16:
BX_VGA_THIS s.vbe_bpp_multiplier = 2;
BX_VGA_THIS s.vbe_line_byte_width = BX_VGA_THIS s.vbe_virtual_xres * 2;
BX_VGA_THIS s.vbe_visable_screen_size = ((BX_VGA_THIS s.vbe_xres) * (BX_VGA_THIS s.vbe_yres)) * 2;
depth=16;
break;
case VBE_DISPI_BPP_24:
BX_VGA_THIS s.vbe_bpp_multiplier = 3;
BX_VGA_THIS s.vbe_line_byte_width = BX_VGA_THIS s.vbe_virtual_xres * 3;
BX_VGA_THIS s.vbe_visable_screen_size = ((BX_VGA_THIS s.vbe_xres) * (BX_VGA_THIS s.vbe_yres)) * 3;
depth=24;
break;
case VBE_DISPI_BPP_32:
BX_VGA_THIS s.vbe_bpp_multiplier = 4;
BX_VGA_THIS s.vbe_line_byte_width = BX_VGA_THIS s.vbe_virtual_xres << 2;
BX_VGA_THIS s.vbe_visable_screen_size = ((BX_VGA_THIS s.vbe_xres) * (BX_VGA_THIS s.vbe_yres)) << 2;
depth=32;
break;
}
BX_INFO(("VBE enabling x %d, y %d, bpp %d, %u bytes visible", BX_VGA_THIS s.vbe_xres, BX_VGA_THIS s.vbe_yres, BX_VGA_THIS s.vbe_bpp, BX_VGA_THIS s.vbe_visable_screen_size));
if (depth > 4)
{
BX_VGA_THIS s.vbe_lfb_enabled=(bx_bool)(value & VBE_DISPI_LFB_ENABLED);
if ((value & VBE_DISPI_NOCLEARMEM) == 0)
{
memset(BX_VGA_THIS s.vbe_memory, 0, BX_VGA_THIS s.vbe_visable_screen_size);
}
bx_gui->dimension_update(BX_VGA_THIS s.vbe_xres, BX_VGA_THIS s.vbe_yres, 0, 0, depth);
old_BPP = depth;
// some test applications expect these standard VGA settings
BX_VGA_THIS s.CRTC.reg[9] = 0x00;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.graphics_alpha = 1;
BX_VGA_THIS s.graphics_ctrl.memory_mapping = 1;
BX_VGA_THIS s.CRTC.reg[1] = (BX_VGA_THIS s.vbe_xres / 8) - 1;
BX_VGA_THIS s.CRTC.reg[19] = BX_VGA_THIS s.vbe_xres >> 2;
BX_VGA_THIS s.attribute_ctrl.mode_ctrl.pixel_clock_select = 1;
BX_VGA_THIS s.CRTC.reg[18] = (BX_VGA_THIS s.vbe_yres - 1) & 0xff;
BX_VGA_THIS s.CRTC.reg[7] &= ~0x42;
if ((BX_VGA_THIS s.vbe_yres - 1) & 0x0100) {
BX_VGA_THIS s.CRTC.reg[7] |= 0x02;
}
if ((BX_VGA_THIS s.vbe_yres - 1) & 0x0200) {
BX_VGA_THIS s.CRTC.reg[7] |= 0x40;
}
}
}
else
{
if (BX_VGA_THIS s.vbe_enabled) BX_INFO(("VBE disabling"));
BX_VGA_THIS s.vbe_lfb_enabled=0;
}
BX_VGA_THIS s.vbe_enabled=(bx_bool)(value & VBE_DISPI_ENABLED);
BX_VGA_THIS s.vbe_get_capabilities=(bx_bool)((value & VBE_DISPI_GETCAPS) != 0);
} break;
case VBE_DISPI_INDEX_X_OFFSET:
{
// BX_INFO(("VBE offset x %x",value));
BX_VGA_THIS s.vbe_offset_x=(Bit16u)value;
BX_VGA_THIS s.vbe_virtual_start = ((BX_VGA_THIS s.vbe_offset_y) * (BX_VGA_THIS s.vbe_line_byte_width)) +
((BX_VGA_THIS s.vbe_offset_x) * (BX_VGA_THIS s.vbe_bpp_multiplier));
BX_VGA_THIS s.vga_mem_updated = 1;
for (unsigned xti = 0; xti < BX_NUM_X_TILES; xti++) {
for (unsigned yti = 0; yti < BX_NUM_Y_TILES; yti++) {
SET_TILE_UPDATED (xti, yti, 1);
}
}
} break;
case VBE_DISPI_INDEX_Y_OFFSET:
{
// BX_INFO(("VBE offset y %x",value));
BX_VGA_THIS s.vbe_offset_y=(Bit16u)value;
BX_VGA_THIS s.vbe_virtual_start = ((BX_VGA_THIS s.vbe_offset_y) * (BX_VGA_THIS s.vbe_line_byte_width)) +
((BX_VGA_THIS s.vbe_offset_x) * (BX_VGA_THIS s.vbe_bpp_multiplier));
BX_VGA_THIS s.vga_mem_updated = 1;
for (unsigned xti = 0; xti < BX_NUM_X_TILES; xti++) {
for (unsigned yti = 0; yti < BX_NUM_Y_TILES; yti++) {
SET_TILE_UPDATED (xti, yti, 1);
}
}
} break;
case VBE_DISPI_INDEX_VIRT_WIDTH:
{
BX_INFO(("VBE requested virtual width %d",value));
// calculate virtual width & height dimensions
// req:
// virt_width > xres
// virt_height >=yres
// virt_width*virt_height < MAX_VIDEO_MEMORY
// basicly 2 situations
// situation 1:
// MAX_VIDEO_MEMORY / virt_width >= yres
// adjust result height
// else
// adjust result width based upon virt_height=yres
Bit16u new_width=value;
Bit16u new_height=(sizeof(BX_VGA_THIS s.vbe_memory) / BX_VGA_THIS s.vbe_bpp_multiplier) / new_width;
if (new_height >=BX_VGA_THIS s.vbe_yres)
{
// we have a decent virtual width & new_height
BX_INFO(("VBE decent virtual height %d",new_height));
}
else
{
// no decent virtual height: adjust width & height
new_height=BX_VGA_THIS s.vbe_yres;
new_width=(sizeof(BX_VGA_THIS s.vbe_memory) / BX_VGA_THIS s.vbe_bpp_multiplier) / new_height;
BX_INFO(("VBE recalc virtual width %d height %d",new_width, new_height));
}
BX_VGA_THIS s.vbe_virtual_xres=new_width;
BX_VGA_THIS s.vbe_virtual_yres=new_height;
BX_VGA_THIS s.vbe_visable_screen_size = (new_width * (BX_VGA_THIS s.vbe_yres)) * BX_VGA_THIS s.vbe_bpp_multiplier;
} break;
/*
case VBE_DISPI_INDEX_VIRT_HEIGHT:
{
BX_INFO(("VBE virtual height %x",value));
} break;
*/
default:
{
BX_PANIC(("VBE unknown data write index 0x%x",BX_VGA_THIS s.vbe_curindex));
} break;
}
break;
} // end switch address
}
#endif
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