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Bochs/bochs/iodev/vga.cc
Bryce Denney 7fdc7303c2 - add "void reset(unsigned type)" method to every I/O device. 
Some devices already had one.  Some I had to add an empty one.
  I did a little cleaning of init() methods to make them more uniform
  but generally I left them alone.
- I also put these exact diffs into a patch "patch.iodev-add-reset"
  in case I want to revert these changes for some reason, for example
  if they break an old patch.  It should be deleted after a while.
2002-08-27 19:54:46 +00:00

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/////////////////////////////////////////////////////////////////////////
// $Id: vga.cc,v 1.38 2002-08-27 19:54:46 bdenney 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
#include "bochs.h"
#define LOG_THIS bx_vga.
/* NOTES:
* I take it data rotate is a true rotate with carry of bit 0 to bit 7.
* support map mask (3c5 reg 02)
*/
// (mch)
#define VGA_TRACE_FEATURE
bx_vga_c bx_vga;
#if BX_USE_VGA_SMF
#define this (&bx_vga)
#endif
unsigned old_iHeight = 0, old_iWidth = 0;
bx_vga_c::bx_vga_c(void)
{
BX_VGA_THIS s.vga_mem_updated = 0;
BX_VGA_THIS s.x_tilesize = X_TILESIZE;
BX_VGA_THIS s.y_tilesize = Y_TILESIZE;
BX_VGA_THIS put("VGA");
}
bx_vga_c::~bx_vga_c(void)
{
// nothing for now
}
void
bx_vga_c::init(bx_devices_c *d, bx_cmos_c *cmos)
{
unsigned i;
unsigned x,y;
BX_VGA_THIS devices = d;
unsigned addr;
for (addr=0x03B4; addr<=0x03B5; addr++) {
BX_VGA_THIS devices->register_io_read_handler(this, read_handler,
addr, "vga video");
BX_VGA_THIS devices->register_io_write_handler(this, write_handler,
addr, "vga video");
}
for (addr=0x03BA; addr<=0x03BA; addr++) {
BX_VGA_THIS devices->register_io_read_handler(this, read_handler,
addr, "vga video");
BX_VGA_THIS devices->register_io_write_handler(this, write_handler,
addr, "vga video");
}
for (addr=0x03C0; addr<=0x03CF; addr++) {
BX_VGA_THIS devices->register_io_read_handler(this, read_handler,
addr, "vga video");
BX_VGA_THIS devices->register_io_write_handler(this, write_handler,
addr, "vga video");
}
for (addr=0x03D4; addr<=0x03D5; addr++) {
BX_VGA_THIS devices->register_io_read_handler(this, read_handler,
addr, "vga video");
BX_VGA_THIS devices->register_io_write_handler(this, write_handler,
addr, "vga video");
}
for (addr=0x03DA; addr<=0x03DA; addr++) {
BX_VGA_THIS devices->register_io_read_handler(this, read_handler,
addr, "vga video");
BX_VGA_THIS devices->register_io_write_handler(this, write_handler,
addr, "vga video");
}
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.CRTC.address = 0;
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.scan_bits=640;
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.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.bit0 = 0;
BX_VGA_THIS s.sequencer.bit1 = 0;
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++)
BX_VGA_THIS s.vga_tile_updated[x][y] = 0;
{
/* ??? should redo this to pass X args */
char *argv[1] = { "bochs" };
bx_gui.init(1, &argv[0], BX_VGA_THIS s.x_tilesize, BX_VGA_THIS s.y_tilesize);
}
BX_INFO(("interval=%lu", bx_options.Ovga_update_interval->get ()));
BX_VGA_THIS timer_id = bx_pc_system.register_timer(this, timer_handler,
bx_options.Ovga_update_interval->get (), 1, 1);
cmos->s.reg[0x14] = (cmos->s.reg[0x14] & 0xcf) | 0x00; /* video card with BIOS ROM */
BX_VGA_THIS s.horiz_tick = 0;
BX_VGA_THIS s.vert_tick = 0;
#if BX_SUPPORT_VBE
// The following is for the vbe display extension
// FIXME: change 0xff80 & 0xff81 into some nice constants
for (addr=0xff80; addr<=0xff81; addr++) {
BX_VGA_THIS devices->register_io_read_handler(this, vbe_read_handler,
addr, "vga video");
BX_VGA_THIS devices->register_io_write_handler(this, vbe_write_handler,
addr, "vga video");
}
BX_VGA_THIS s.vbe_cur_dispi=VBE_DISPI_ID0;
BX_VGA_THIS s.vbe_xres=640;
BX_VGA_THIS s.vbe_yres=400;
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=400;
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;
BX_VGA_THIS s.scan_bits=640;
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 ((ai[9] & 0x9f) > 0) v >>= 1;
/*
switch ( ( BX_VGA_THIS s.misc_output.vert_sync_pol << 1) | BX_VGA_THIS s.misc_output.horiz_sync_pol )
{
case 0: *piHeight = 200; break;
case 1: *piHeight = 400; break;
case 2: *piHeight = 350; break;
case 3: *piHeight = 480; break;
}
*/
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;
}
if (BX_VGA_THIS s.CRTC.reg[23] == 0xE3 &&
BX_VGA_THIS s.CRTC.reg[20] == 0xF &&
BX_VGA_THIS s.CRTC.reg[9] == 0x40)
{
*piWidth = 640;
*piHeight = 352;
}
if (BX_VGA_THIS s.CRTC.reg[23] == 0xE3 &&
BX_VGA_THIS s.CRTC.reg[20] == 0 &&
BX_VGA_THIS s.CRTC.reg[9] == 0xC0)
{
BX_VGA_THIS s.scan_bits = BX_VGA_THIS s.CRTC.reg[19] << 4;
*piWidth = h;
*piHeight = v;
}
}
}
else if ( BX_VGA_THIS s.graphics_ctrl.shift_reg == 2 )
{
if ( BX_VGA_THIS s.sequencer.chain_four )
{
*piWidth = 320;
*piHeight = 200;
}
else
{
*piWidth = h / 2;
*piHeight = v;
}
}
else
{
*piWidth = 640;
*piHeight = 400;
}
}
// 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
Boolean horiz_retrace, vert_retrace;
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
if (io_len > 1)
BX_PANIC(("io read from address %08x, len=%u",
(unsigned) address, (unsigned) io_len));
#ifdef __OS2__
if ( bx_options.videomode == BX_VIDEO_DIRECT )
{
return _inp(address);
}
#endif
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("vga_io_read(%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
// printf("horiz = %d, vert = %d", BX_VGA_THIS s.horiz_tick, BX_VGA_THIS s.vert_tick);
if(BX_VGA_THIS s.misc_output.clock_select == 0){ // 25.175 clock 112.5% the length of 28.32
if (BX_VGA_THIS s.horiz_tick >= 112) {
BX_VGA_THIS s.horiz_tick = 0;
horiz_retrace = 1;
}
else {
BX_VGA_THIS s.horiz_tick++;
horiz_retrace = 0;
}
if (BX_VGA_THIS s.vert_tick >= 112) {
BX_VGA_THIS s.vert_tick = 0;
vert_retrace = 1;
}
else {
BX_VGA_THIS s.vert_tick++;
vert_retrace = 0;
}
}else{ // clock_select 1 is assumed to be the 28.32 clock in XF86_VGA16
if (BX_VGA_THIS s.horiz_tick >= 100) { // ??? bogus # 100
BX_VGA_THIS s.horiz_tick = 0;
horiz_retrace = 1;
}
else {
BX_VGA_THIS s.horiz_tick++;
horiz_retrace = 0;
}
if (BX_VGA_THIS s.vert_tick >= 100) { // ??? bogus # 100
BX_VGA_THIS s.vert_tick = 0;
vert_retrace = 1;
}
else {
BX_VGA_THIS s.vert_tick++;
vert_retrace = 0;
}
} // probably add more clock modes here for diffrent resolutions
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(("vga_io_read: 3c0: 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(("vga_io_read: 3c1: address %02xh?",
(unsigned) BX_VGA_THIS s.attribute_ctrl.address));
RETURN(0);
}
break;
case 0x03c2: /* Input Status 0 */
BX_DEBUG(("io read 3c2: 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 3c5 case 0: sequencer reset"));
RETURN(BX_VGA_THIS s.sequencer.bit0 | (BX_VGA_THIS s.sequencer.bit1<<1));
break;
case 1: /* sequencer: clocking mode */
BX_DEBUG(("io read 3c5 case 1: 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 3c5: 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 0x03c9: /* PEL Data Register, colors 00..FF */
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++;
}
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(("read 3cf: reg 05 = %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: 3cf: 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(("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 0x03c7: /* not sure but OpenBSD reads it a lot */
case 0x03cb: /* not sure but OpenBSD reads it a lot */
case 0x03c8: /* */
default:
BX_INFO(("*** io read from vga port %x", (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);
bx_vga.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);
bx_vga.write(address, value, io_len, 1);
#endif
}
void
bx_vga_c::write(Bit32u address, Bit32u value, unsigned io_len, Boolean no_log)
{
unsigned i;
Boolean prev_video_enabled;
Bit8u charmap1, charmap2, prev_memory_mapping;
Boolean prev_graphics_alpha, prev_chain_odd_even;
Boolean needs_update;
#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"));
}
#endif
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("vga_io_write(%04x)=%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 0x03b4: /* CRTC Index Register (monochrome 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) */
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;
}
BX_VGA_THIS s.CRTC.reg[BX_VGA_THIS s.CRTC.address] = value;
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("mono CRTC Reg[%u] = %02x",
(unsigned) BX_VGA_THIS s.CRTC.address, (unsigned) value);
#endif
break;
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
// Mark all video as updated so the color changes will go through
memset(BX_VGA_THIS s.text_snapshot, 0,
sizeof(BX_VGA_THIS s.text_snapshot));
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++) {
BX_VGA_THIS s.vga_tile_updated[xti][yti] = 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 3c0: address mode reg=%u",
(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:
BX_VGA_THIS s.attribute_ctrl.palette_reg[BX_VGA_THIS s.attribute_ctrl.address] =
value;
//BX_DEBUG(("io write: 3c0 palette reg[%u] = %02x",
// (unsigned) BX_VGA_THIS s.attribute_ctrl.address,
// (unsigned) value);
break;
case 0x10: // mode control register
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 !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 3c0: mode control: %02x h",
(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 3c0: overscan color = %02x",
(unsigned) value);
#endif
break;
case 0x12: // Color Plane Enable Register
BX_VGA_THIS s.attribute_ctrl.color_plane_enable = (value & 0x0f);
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 3c0: color plane enable = %02x",
(unsigned) value);
#endif
break;
case 0x13: // Horizontal Pixel Panning Register
BX_VGA_THIS s.attribute_ctrl.horiz_pel_panning = (value & 0x0f);
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 3c0: horiz pel panning = %02x",
(unsigned) value);
#endif
break;
case 0x14: // Color Select Register
BX_VGA_THIS s.attribute_ctrl.color_select = (value & 0x0f);
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 3c0: color select = %02x",
(unsigned) BX_VGA_THIS s.attribute_ctrl.color_select);
#endif
break;
default:
BX_DEBUG(("io write 3c0: data-write mode %02x h",
(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(("io write 3c5=%02x: reset reg: ignoring",
(unsigned) value);
#endif
BX_VGA_THIS s.sequencer.bit0 = (value >> 0) & 0x01;
BX_VGA_THIS s.sequencer.bit1 = (value >> 1) & 0x01;
break;
case 1: /* sequencer: clocking mode */
#if !defined(VGA_TRACE_FEATURE)
BX_DEBUG(("io write 3c5=%02x: clocking mode reg: ignoring",
(unsigned) value);
#endif
BX_VGA_THIS s.sequencer.reg1 = value & 0x3f;
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;
BX_INFO(("char map select: #1=%d / #2=%d (unused)", charmap1, 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 3c5: index 4:"));
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 3c5: index %u 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 3c6: PEL mask=0x%02x != 0xFF"));
// BX_VGA_THIS s.pel.mask should be and'd with final value before
// indexing into color registerBX_VGA_THIS s.
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;
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;
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;
{
unsigned iHeight, iWidth;
#if BX_SUPPORT_VBE
// when we are in a vbe enabled mode, better get the width/height from the vbe settings
if (BX_VGA_THIS s.vbe_enabled)
{
old_iWidth = iWidth = BX_VGA_THIS s.vbe_xres;
old_iHeight = iHeight = BX_VGA_THIS s.vbe_yres;
}
else
#endif
{
// 'normal vga' operation
determine_screen_dimensions(&iHeight, &iWidth);
if( (iWidth != old_iWidth) || (iHeight != old_iHeight) )
{
bx_gui.dimension_update(iWidth, iHeight);
old_iWidth = iWidth;
old_iHeight = iHeight;
}
}
}
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);
if (needs_update) {
// Mark all video as updated so the color changes will go through
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++) {
BX_VGA_THIS s.vga_tile_updated[xti][yti] = 1;
}
}
}
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 0x03ce: /* Graphics Controller Index Register */
if (value > 0x08) /* ??? */
BX_DEBUG(("io write: 3ce: value > 8"));
BX_VGA_THIS s.graphics_ctrl.index = value;
break;
case 0x03cd: /* ??? */
BX_DEBUG(("io write to 03cd = %02x", (unsigned) 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 03cf = %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: 3cf: reg 05: value = %02xh",
(unsigned) value));
if (BX_VGA_THIS s.graphics_ctrl.shift_reg)
BX_DEBUG(("io write: 3cf: reg 05: value = %02xh",
(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: 3cf: reg 06: value = %02xh",
(unsigned) value);
#endif
if (prev_memory_mapping != BX_VGA_THIS s.graphics_ctrl.memory_mapping)
BX_VGA_THIS s.vga_mem_updated = 1;
// other checks here ???
// check for transition from graphics to alpha mode and clear
// old snapshot memory
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: 3cf: index %u unhandled",
(unsigned) BX_VGA_THIS s.graphics_ctrl.index));
}
break;
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 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;
}
BX_VGA_THIS s.CRTC.reg[BX_VGA_THIS s.CRTC.address] = value;
//BX_DEBUG(("color CRTC Reg[%u] = %02x",
// (unsigned) BX_VGA_THIS s.CRTC.address, (unsigned) value));
if (BX_VGA_THIS s.CRTC.address>=0x0A && BX_VGA_THIS s.CRTC.address<=0x0F) {
// Start address or cursor size / location change
BX_VGA_THIS s.vga_mem_updated = 1;
}
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));
}
}
void
bx_vga_c::set_update_interval (unsigned interval)
{
BX_INFO (("Changing timer interval to %d\n", interval));
BX_VGA_THIS timer ();
bx_pc_system.activate_timer (BX_VGA_THIS timer_id, interval, 1);
}
void
bx_vga_c::timer_handler(void *this_ptr)
{
bx_vga_c *class_ptr = (bx_vga_c *) this_ptr;
class_ptr->timer();
}
void
bx_vga_c::timer(void)
{
update();
bx_gui.flush();
}
void
bx_vga_c::update(void)
{
unsigned iHeight, iWidth;
if (BX_VGA_THIS s.vga_mem_updated==0) {
/* BX_DEBUG(("update(): updated=%u enabled=%u", (unsigned) BX_VGA_THIS s.vga_mem_updated, (unsigned) BX_VGA_THIS s.attribute_ctrl.video_enabled)); */
return;
}
BX_VGA_THIS s.vga_mem_updated = 0;
#if BX_SUPPORT_VBE
if (BX_VGA_THIS s.vbe_enabled)
{
// specific VBE code display update code
// this is partly copied/modified from the 320x200x8 update more below
unsigned xti, yti;
Bit8u color;
unsigned r, c;
unsigned long byte_offset;
unsigned long pixely, pixelx;
iWidth=BX_VGA_THIS s.vbe_xres;
iHeight=BX_VGA_THIS s.vbe_yres;
// incl virtual xres correction
Bit32u start_offset = ((BX_VGA_THIS s.vbe_offset_y) * (BX_VGA_THIS s.vbe_virtual_xres)) + BX_VGA_THIS s.vbe_offset_x;
for (yti=0; yti<iHeight/Y_TILESIZE; yti++)
for (xti=0; xti<iWidth/X_TILESIZE; xti++)
{
if (BX_VGA_THIS s.vga_tile_updated[xti][yti])
{
for (r=0; r<Y_TILESIZE; r++)
{
for (c=0; c<X_TILESIZE; c++)
{
pixely = ((yti*Y_TILESIZE) + r);
pixelx = ((xti*X_TILESIZE) + c);
// incl virtual xres correction
byte_offset = (pixely*(BX_VGA_THIS s.vbe_virtual_xres)) + (pixelx);
color = BX_VGA_THIS s.vbe_memory[start_offset + byte_offset];
BX_VGA_THIS s.tile[r*X_TILESIZE + c] = color;
}
}
bx_gui.graphics_tile_update(BX_VGA_THIS s.tile,
xti*X_TILESIZE, yti*Y_TILESIZE);
BX_VGA_THIS s.vga_tile_updated[xti][yti] = 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
// 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)
//fprintf(stderr, "# update()");
// 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;
unsigned long byte_offset;
unsigned xti, yti;
//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);
switch ( BX_VGA_THIS s.graphics_ctrl.shift_reg ) {
case 0: // output data in serial fashion with each display plane
// output on its associated serial output. Standard EGA/VGA format
Bit8u attribute, palette_reg_val, DAC_regno;
unsigned long start_addr;
determine_screen_dimensions(&iHeight, &iWidth);
//BX_DEBUG(("update(): Mode 12h: 640x480x16colors"));
if( (iWidth != old_iWidth) || (iHeight != old_iHeight) )
{
bx_gui.dimension_update(iWidth, iHeight);
old_iWidth = iWidth;
old_iHeight = iHeight;
}
start_addr = (BX_VGA_THIS s.CRTC.reg[0x0c] << 8) | BX_VGA_THIS s.CRTC.reg[0x0d];
for (yti=0; yti<iHeight/Y_TILESIZE; yti++)
for (xti=0; xti<iWidth/X_TILESIZE; xti++) {
if (BX_VGA_THIS s.vga_tile_updated[xti][yti]) {
for (r=0; r<Y_TILESIZE; r++) {
for (c=0; c<X_TILESIZE; c++) {
bit_no = 7 - (c % 8);
byte_offset = start_addr + (xti*X_TILESIZE+c)/8 +
((yti*Y_TILESIZE+r) * (BX_VGA_THIS s.scan_bits/8));
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;
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;
}
}
bx_gui.graphics_tile_update(BX_VGA_THIS s.tile,
xti*X_TILESIZE, yti*Y_TILESIZE);
BX_VGA_THIS s.vga_tile_updated[xti][yti] = 0;
}
}
break; // case 0
case 1: // output the data in a CGA-compatible 320x200 4 color graphics
// mode. (modes 4 & 5)
/* CGA 320x200x4 start */
iHeight=200; iWidth=320;
if( (iWidth != old_iWidth) || (iHeight != old_iHeight) )
{
bx_gui.dimension_update(iWidth, iHeight);
old_iWidth = iWidth;
old_iHeight = iHeight;
}
for (yti=0; yti<=iHeight/Y_TILESIZE; yti++)
for (xti=0; xti<iWidth/X_TILESIZE; xti++) {
if (BX_VGA_THIS s.vga_tile_updated[xti][yti]) {
for (r=0; r<Y_TILESIZE; r++) {
for (c=0; c<X_TILESIZE; c++) {
/* 0 or 0x2000 */
byte_offset = ((yti*Y_TILESIZE + r) & 1) << 13;
/* to the start of the line */
byte_offset += (320 / 4) * ((yti*Y_TILESIZE + r) / 2);
/* to the byte start */
byte_offset += ((xti*X_TILESIZE + c) / 4);
attribute = 6 - 2*((xti*X_TILESIZE + c) % 4);
palette_reg_val = (BX_VGA_THIS s.vga_memory[byte_offset]) >> attribute;
palette_reg_val &= 3;
palette_reg_val |= BX_VGA_THIS s.attribute_ctrl.mode_ctrl.enable_line_graphics << 2;
// palette_reg_val |= BX_VGA_THIS s.attribute_ctrl.mode_ctrl.blink_intensity << 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;
}
}
bx_gui.graphics_tile_update(BX_VGA_THIS s.tile,
xti*X_TILESIZE, yti*Y_TILESIZE);
BX_VGA_THIS s.vga_tile_updated[xti][yti] = 0;
}
}
/* CGA 320x200x4 end */
break; // case 1
case 2: // output the data eight bits at a time from the 4 bit planeBX_VGA_THIS s.
// (format for VGA mode 13 hex)
determine_screen_dimensions(&iHeight, &iWidth);
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"));
if( (iHeight != old_iHeight) || (iWidth != old_iWidth) )
{
bx_gui.dimension_update(iWidth, iHeight);
old_iHeight = iHeight;
old_iWidth = iWidth;
}
for (yti=0; yti<iHeight/Y_TILESIZE; yti++)
for (xti=0; xti<iWidth/X_TILESIZE; xti++) {
if (BX_VGA_THIS s.vga_tile_updated[xti][yti]) { // }
// if (1) {
for (r=0; r<Y_TILESIZE; r++) {
for (c=0; c<X_TILESIZE; c++) {
pixely = ((yti*Y_TILESIZE) + r);
pixelx = ((xti*X_TILESIZE) + c);
plane = (pixelx % 4);
byte_offset = (plane * 65536) +
(pixely * 320) + (pixelx & ~0x03);
// simulate wrap of upper two address bits into low order bits
//byte_offset |= ((byte_offset & 0xc000) >> 14);
color = BX_VGA_THIS s.vga_memory[byte_offset];
BX_VGA_THIS s.tile[r*X_TILESIZE + c] = color;
}
}
bx_gui.graphics_tile_update(BX_VGA_THIS s.tile,
xti*X_TILESIZE, yti*Y_TILESIZE);
BX_VGA_THIS s.vga_tile_updated[xti][yti] = 0;
}
}
}
else { // chain_four == 0, modeX
unsigned long pixely, pixelx, plane, start_addr;
if( (iWidth != old_iWidth) || (iHeight != old_iHeight) )
{
bx_gui.dimension_update(iWidth, iHeight);
old_iWidth = iWidth;
old_iHeight = iHeight;
}
start_addr = (BX_VGA_THIS s.CRTC.reg[0x0c] << 8) | BX_VGA_THIS s.CRTC.reg[0x0d];
for (yti=0; yti<iHeight/Y_TILESIZE; yti++)
for (xti=0; xti<iWidth/X_TILESIZE; xti++) {
// if (BX_VGA_THIS s.vga_tile_updated[xti][yti]) { // }
if (1) {
for (r=0; r<Y_TILESIZE; r++) {
for (c=0; c<X_TILESIZE; c++) {
pixely = ((yti*Y_TILESIZE) + r);
pixelx = ((xti*X_TILESIZE) + c);
plane = (pixelx % 4);
byte_offset = (plane * 65536) +
(pixely * (BX_VGA_THIS s.CRTC.reg[0x13]<<1))
+ (pixelx >> 2);
color = BX_VGA_THIS s.vga_memory[start_addr + byte_offset];
BX_VGA_THIS s.tile[r*X_TILESIZE + c] = color;
}
}
bx_gui.graphics_tile_update(BX_VGA_THIS s.tile,
xti*X_TILESIZE, yti*Y_TILESIZE);
BX_VGA_THIS s.vga_tile_updated[xti][yti] = 0;
}
}
}
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;
Bit16u cursor_state;
switch (BX_VGA_THIS s.graphics_ctrl.memory_mapping) {
case 2: // B0000 .. B7FFF
iWidth = 8*80; // TODO: should use font size
iHeight = 16*25;
if( (iWidth != old_iWidth) || (iHeight != old_iHeight) )
{
bx_gui.dimension_update(iWidth, iHeight, 16);
old_iWidth = iWidth;
old_iHeight = iHeight;
}
//BX_DEBUG(("update(): case 2"));
/* 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) % 80;
cursor_y = ((cursor_address - start_address)/2) / 80;
}
cursor_state = (bx_vga.s.CRTC.reg[0x0a] << 8) | bx_vga.s.CRTC.reg[0x0b];
bx_gui.text_update(BX_VGA_THIS s.text_snapshot,
&BX_VGA_THIS s.vga_memory[start_address],
cursor_x, cursor_y, cursor_state, 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 3: // B8000 .. BFFFF
unsigned VDE, MSL, rows;
// Verticle Display End: find out how many lines are displayed
VDE = bx_vga.s.CRTC.reg[0x12] |
((bx_vga.s.CRTC.reg[0x07]<<7)&0x100) |
((bx_vga.s.CRTC.reg[0x07]<<3)&0x200);
// Maximum Scan Line: height of character cell
MSL = bx_vga.s.CRTC.reg[0x09] & 0x1f;
rows = (VDE+1)/(MSL+1);
if (rows > BX_MAX_TEXT_LINES)
BX_PANIC(("text rows>%d: %d",BX_MAX_TEXT_LINES,rows));
iWidth = 8 * (BX_VGA_THIS s.CRTC.reg[1] + 1);
iHeight = VDE+1;
if( (iWidth != old_iWidth) || (iHeight != old_iHeight) )
{
bx_gui.dimension_update(iWidth, iHeight, MSL+1);
old_iWidth = iWidth;
old_iHeight = iHeight;
}
// 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/8);
cursor_y = ((cursor_address - start_address)/2) / (iWidth/8);
}
cursor_state = (bx_vga.s.CRTC.reg[0x0a] << 8) | bx_vga.s.CRTC.reg[0x0b];
bx_gui.text_update(BX_VGA_THIS s.text_snapshot,
&BX_VGA_THIS s.vga_memory[start_address],
cursor_x, cursor_y, cursor_state, 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)
{
return vbe_mem_read(addr);
}
#endif
#if defined(VGA_TRACE_FEATURE)
// BX_DEBUG(("8-bit memory read from %08x", addr));
#endif
// ??? should get rid of references to shift_reg in this function
#ifdef __OS2__
if ( bx_options.videomode == BX_VIDEO_DIRECT )
{
char value;
value = devices->mem->video[addr-0xA0000];
return value;
}
#endif
if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha) {
if (BX_VGA_THIS s.graphics_ctrl.memory_mapping == 3) { // 0xB8000 .. 0xBFFFF
if (addr < 0xB8000)
return(0xff);
offset = addr - 0xB8000;
if ( (BX_VGA_THIS s.graphics_ctrl.shift_reg != 1) &&
(BX_VGA_THIS s.graphics_ctrl.shift_reg != 2) )
BX_PANIC(("vga_mem_read: shift_reg = %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.shift_reg));
return(BX_VGA_THIS s.vga_memory[offset]);
}
if (BX_VGA_THIS s.graphics_ctrl.memory_mapping != 1) {
BX_DEBUG((" location %08x", (unsigned) addr));
BX_PANIC(("vga_mem_read: graphics: mapping = %u?",
(unsigned) BX_VGA_THIS s.graphics_ctrl.memory_mapping));
return(0);
}
if (addr > 0xAFFFF)
return(0xff);
// addr between 0xA0000 and 0xAFFFF
offset = addr - 0xA0000;
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] );
}
}
else {
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);
offset = addr - 0xB0000;
break;
case 3: // 0xB8000 .. 0xBFFFF
if (addr < 0xB8000) return(0xff);
offset = addr - 0xB8000;
break;
default: // 0xA0000 .. 0xBFFFF
offset = addr - 0xA0000;
}
if (BX_VGA_THIS s.graphics_ctrl.memory_mapping != 1)
return(BX_VGA_THIS s.vga_memory[offset]);
}
/* 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, pixel_val;
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];
retval = 0;
for (unsigned b=0; b<8; b++) {
pixel_val =
((latch0 << 0) & 0x01) |
((latch1 << 1) & 0x02) |
((latch2 << 2) & 0x04) |
((latch3 << 3) & 0x08);
latch0 >>= 1;
latch1 >>= 1;
latch2 >>= 1;
latch3 >>= 1;
if ( (pixel_val & color_dont_care) ==
(color_compare & color_dont_care) )
retval |= (1 << b);
}
return(retval);
}
break;
default:
return(0);
}
}
void
bx_vga_c::mem_write(Bit32u addr, Bit8u value)
{
Bit32u offset;
Bit8u new_bit, new_val[4], cpu_data_b[4];
#if BX_SUPPORT_VBE
// if in a vbe enabled mode, write to the vbe_memory
if (BX_VGA_THIS s.vbe_enabled)
{
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_options.videomode == BX_VIDEO_DIRECT )
{
devices->mem->video[addr-0xA0000] = value;
return;
}
#endif
if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha) {
if (BX_VGA_THIS s.graphics_ctrl.memory_mapping == 1) { // 0xA0000 .. 0xAFFFF
// unsigned x_tileno, y_tileno;
if ( (addr < 0xA0000) || (addr > 0xAFFFF) )
return;
offset = addr - 0xA0000;
}
else if (BX_VGA_THIS s.graphics_ctrl.memory_mapping == 3) { // 0xB8000 .. 0xBFFFF
unsigned x_tileno, y_tileno, isEven;
if ( (addr < 0xB8000) || (addr > 0xBFFFF) )
return;
offset = addr - 0xB8000;
/* CGA 320x200x4 start */
isEven = (offset>=0x2000)?1:0;
if (isEven) {
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 = offset<<1; //2 * offset;
x_tileno = offset % (320/4);
x_tileno <<= 2; //*=4;
}
x_tileno/=X_TILESIZE;
y_tileno/=Y_TILESIZE;
BX_VGA_THIS s.vga_mem_updated = 1;
BX_VGA_THIS s.vga_tile_updated[x_tileno][y_tileno] = 1;
/* CGA 320x200x4 end */
}
else {
BX_PANIC(("vga_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;
offset = addr - 0xA0000;
BX_VGA_THIS s.vga_memory[(offset & ~0x03) + (offset % 4)*65536] = value;
// 320 x 200 256 color mode: chained pixel representation
y_tileno = (offset / 320) / Y_TILESIZE;
x_tileno = (offset % 320) / X_TILESIZE;
BX_VGA_THIS s.vga_mem_updated = 1;
BX_VGA_THIS s.vga_tile_updated[x_tileno][y_tileno] = 1;
return;
}
}
else {
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;
}
if (BX_VGA_THIS s.graphics_ctrl.memory_mapping != 1) {
BX_VGA_THIS s.vga_memory[offset] = value;
BX_VGA_THIS s.vga_mem_updated = 1;
return;
}
}
/* addr between 0xA0000 and 0xAFFFF */
switch (BX_VGA_THIS s.graphics_ctrl.write_mode) {
Bit8u and_mask, bitmask;
Bit8u set_reset_b[4];
unsigned i, b;
case 0: /* write mode 0 */
/* perform rotate on CPU data in case its needed */
value = (value >> BX_VGA_THIS s.graphics_ctrl.data_rotate) |
(value << (8 - BX_VGA_THIS s.graphics_ctrl.data_rotate));
bitmask = BX_VGA_THIS s.graphics_ctrl.bitmask;
for (i=0; i<4; i++ ) {
new_val[i] = 0;
}
set_reset_b[0] = (BX_VGA_THIS s.graphics_ctrl.set_reset >> 0) & 0x01;
set_reset_b[1] = (BX_VGA_THIS s.graphics_ctrl.set_reset >> 1) & 0x01;
set_reset_b[2] = (BX_VGA_THIS s.graphics_ctrl.set_reset >> 2) & 0x01;
set_reset_b[3] = (BX_VGA_THIS s.graphics_ctrl.set_reset >> 3) & 0x01;
and_mask = 1;
for (b=0; b<8; b++) {
if (bitmask & 0x01) { /* bit-mask bit set, perform op */
for (i=0; i<4; i++) {
/* derive bit from set/reset register */
if ( (BX_VGA_THIS s.graphics_ctrl.enable_set_reset >> i) & 0x01 ) {
new_bit = (set_reset_b[i] << b);
}
/* derive bit from rotated CPU data */
else {
new_bit = (value & and_mask);
}
switch (BX_VGA_THIS s.graphics_ctrl.raster_op) {
case 0: /* replace */
new_val[i] |= new_bit;
break;
case 1: /* AND with latch data */
new_val[i] |=
(new_bit & (BX_VGA_THIS s.graphics_ctrl.latch[i] & and_mask));
break;
case 2: /* OR with latch data */
new_val[i] |=
(new_bit | (BX_VGA_THIS s.graphics_ctrl.latch[i] & and_mask));
break;
case 3: /* XOR with latch data */
new_val[i] |=
(new_bit ^ (BX_VGA_THIS s.graphics_ctrl.latch[i] & and_mask));
break;
default:
BX_PANIC(("vga_mem_write: write mode 0: op = %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.raster_op));
}
}
}
else { /* bit-mask bit clear, pass data thru from latch */
new_val[0] |= (BX_VGA_THIS s.graphics_ctrl.latch[0] & and_mask);
new_val[1] |= (BX_VGA_THIS s.graphics_ctrl.latch[1] & and_mask);
new_val[2] |= (BX_VGA_THIS s.graphics_ctrl.latch[2] & and_mask);
new_val[3] |= (BX_VGA_THIS s.graphics_ctrl.latch[3] & and_mask);
}
bitmask >>= 1;
and_mask <<= 1;
}
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 */
if (BX_VGA_THIS s.graphics_ctrl.raster_op)
BX_PANIC(("vga_mem_write: write mode 2: op = %u",
(unsigned) BX_VGA_THIS s.graphics_ctrl.raster_op));
bitmask = BX_VGA_THIS s.graphics_ctrl.bitmask;
for (i=0; i<4; i++ ) {
new_val[i] = 0;
}
cpu_data_b[0] = (value >> 0) & 0x01;
cpu_data_b[1] = (value >> 1) & 0x01;
cpu_data_b[2] = (value >> 2) & 0x01;
cpu_data_b[3] = (value >> 3) & 0x01;
and_mask = 1;
for (b=0; b<8; b++) {
if (bitmask & 0x01) { /* bit-mask bit set, perform op */
switch (BX_VGA_THIS s.graphics_ctrl.raster_op) {
case 0: /* replace: write cpu data unmodified */
new_val[0] |= cpu_data_b[0] << b;
new_val[1] |= cpu_data_b[1] << b;
new_val[2] |= cpu_data_b[2] << b;
new_val[3] |= cpu_data_b[3] << b;
break;
case 1: /* AND */
case 2: /* OR */
case 3: /* XOR */
default:
BX_PANIC(("vga_mem_write: raster_op = %u?",
(unsigned) BX_VGA_THIS s.graphics_ctrl.raster_op));
}
}
else { /* bit-mask bit clear, pass data thru from latch */
new_val[0] |= (BX_VGA_THIS s.graphics_ctrl.latch[0] & and_mask);
new_val[1] |= (BX_VGA_THIS s.graphics_ctrl.latch[1] & and_mask);
new_val[2] |= (BX_VGA_THIS s.graphics_ctrl.latch[2] & and_mask);
new_val[3] |= (BX_VGA_THIS s.graphics_ctrl.latch[3] & and_mask);
}
bitmask >>= 1;
and_mask <<= 1;
}
break;
case 3: /* write mode 3 */
/* perform rotate on CPU data */
value = (value >> BX_VGA_THIS s.graphics_ctrl.data_rotate) |
(value << (8 - BX_VGA_THIS s.graphics_ctrl.data_rotate));
bitmask = (value & BX_VGA_THIS s.graphics_ctrl.bitmask);
for (i=0; i<4; i++ ) {
new_val[i] = 0;
}
set_reset_b[0] = (BX_VGA_THIS s.graphics_ctrl.set_reset >> 0) & 0x01;
set_reset_b[1] = (BX_VGA_THIS s.graphics_ctrl.set_reset >> 1) & 0x01;
set_reset_b[2] = (BX_VGA_THIS s.graphics_ctrl.set_reset >> 2) & 0x01;
set_reset_b[3] = (BX_VGA_THIS s.graphics_ctrl.set_reset >> 3) & 0x01;
and_mask = 1;
for (b=0; b<8; b++) {
if (bitmask & 0x01) { /* bit-mask bit set, perform op */
for (i=0; i<4; i++) {
/* derive bit from set/reset register */
/* (mch) I can't find any justification for this... */
if ( /* (mch) */ 1 || ((BX_VGA_THIS s.graphics_ctrl.enable_set_reset >> i) & 0x01 )) {
// (mch) My guess is that the function select logic should go here
switch (BX_VGA_THIS s.graphics_ctrl.raster_op) {
case 0: // write
new_val[i] |= (set_reset_b[i] << b);
break;
case 1: // AND
new_val[i] |= ((set_reset_b[i] << b) &
BX_VGA_THIS s.graphics_ctrl.latch[i] & (1 << b));
break;
case 2: // OR
new_val[i] |= (set_reset_b[i] << b) |
(BX_VGA_THIS s.graphics_ctrl.latch[i] & (1 << b));
break;
case 3: // XOR
new_val[i] |= ((set_reset_b[i] << b) ^
BX_VGA_THIS s.graphics_ctrl.latch[i] & (1 << b));
break;
}
}
/* derive bit from rotated CPU data */
else {
new_val[i] |= (value & and_mask);
}
}
}
else { /* bit-mask bit clear, pass data thru from latch */
new_val[0] |= (BX_VGA_THIS s.graphics_ctrl.latch[0] & and_mask);
new_val[1] |= (BX_VGA_THIS s.graphics_ctrl.latch[1] & and_mask);
new_val[2] |= (BX_VGA_THIS s.graphics_ctrl.latch[2] & and_mask);
new_val[3] |= (BX_VGA_THIS s.graphics_ctrl.latch[3] & and_mask);
}
bitmask >>= 1;
and_mask <<= 1;
}
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])
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;
x_tileno = (offset % (BX_VGA_THIS s.scan_bits/8)) / (X_TILESIZE / 8);
y_tileno = (offset / (BX_VGA_THIS s.scan_bits/8)) / Y_TILESIZE;
BX_VGA_THIS s.vga_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.s.CRTC.reg[0x12] |
((bx_vga.s.CRTC.reg[0x07]<<7)&0x100) |
((bx_vga.s.CRTC.reg[0x07]<<3)&0x200);
MSL = bx_vga.s.CRTC.reg[0x09] & 0x1f;
*txHeight = (VDE+1)/(MSL+1);
*txWidth = BX_VGA_THIS s.CRTC.reg[1] + 1;
} else {
*txHeight = 0;
*txWidth = 0;
}
}
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;
BX_VGA_THIS s.vga_mem_updated = 1;
if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha) {
// graphics mode
BX_VGA_THIS s.vga_mem_updated = 1;
x1 = x0 + width - 1;
y1 = y0 + height - 1;
for (yi=0; yi<480; yi+=Y_TILESIZE) {
for (xi=0; xi<640; 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+X_TILESIZE-1)) continue;
BX_VGA_THIS s.vga_tile_updated[xi/X_TILESIZE][yi/Y_TILESIZE] = 1;
}
}
}
else {
// text mode
memset(BX_VGA_THIS s.text_snapshot, 0,
sizeof(BX_VGA_THIS s.text_snapshot));
BX_VGA_THIS s.vga_mem_updated = 1;
}
}
#if BX_SUPPORT_VBE
Bit8u
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 > sizeof(BX_VGA_THIS s.vbe_memory))
return 0;
return (BX_VGA_THIS s.vbe_memory[offset]);
}
void
bx_vga_c::vbe_mem_write(Bit32u addr, Bit8u value)
{
Bit32u offset;
unsigned x_tileno, y_tileno;
if (addr >= VBE_DISPI_LFB_PHYSICAL_ADDRESS)
{
// LFB write
offset = addr - VBE_DISPI_LFB_PHYSICAL_ADDRESS;
}
else
{
// banked mode write
offset = BX_VGA_THIS s.vbe_bank*65536 + (addr - 0xA0000);
}
// check for out of memory write
if (offset < sizeof(BX_VGA_THIS s.vbe_memory))
{
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));
}
}
// only update the UI when writing 'onscreen'
if (offset < BX_VGA_THIS s.vbe_visable_screen_size)
{
// incl virtual xres correction
Bit32u start_offset = ((BX_VGA_THIS s.vbe_offset_y) * (BX_VGA_THIS s.vbe_virtual_xres)) + BX_VGA_THIS s.vbe_offset_x;
offset=offset-start_offset;
y_tileno = (offset / BX_VGA_THIS s.vbe_virtual_xres) / Y_TILESIZE;
// FIXME: need virtual_xres!=xres correction for x?
x_tileno = (offset % 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;
BX_VGA_THIS s.vga_tile_updated[x_tileno][y_tileno] = 1;
}
/* else
BX_INFO(("VBE_mem_write out of tile update array y %d, x %d\n",y_tileno,x_tileno));
*/
}
}
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)
{
// 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
{
return BX_VGA_THIS s.vbe_xres;
} break;
case VBE_DISPI_INDEX_YRES: // y resolution
{
return BX_VGA_THIS s.vbe_yres;
} break;
case VBE_DISPI_INDEX_BPP: // bpp
{
return BX_VGA_THIS s.vbe_bpp;
} break;
case VBE_DISPI_INDEX_ENABLE: // vbe enabled
{
return BX_VGA_THIS s.vbe_enabled;
} 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"));
}
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));
if (address==VBE_DISPI_IOPORT_INDEX)
{
// index register
BX_VGA_THIS s.vbe_curindex = (Bit16u) value;
}
else
{
// data register
// FIXME: maybe do some 'sanity' checks on received data?
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))
{
// 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;
}
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;
}
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)
{
// check for correct bpp range
if (value == VBE_DISPI_BPP_8)
{
BX_VGA_THIS s.vbe_bpp=(Bit16u) 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_MB * 1024 /64))
{
BX_INFO(("VBE set bank to %d", value));
BX_VGA_THIS s.vbe_bank=value;
}
else
{
BX_INFO(("VBE set invalid bank (%d)",value));
}
} break;
case VBE_DISPI_INDEX_ENABLE: // enable video
{
if (value)
{
// 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;
// FIXME: VBE allows for *not* clearing the screen when setting a mode
// FIXME: make dependant on bpp (currently only 8bpp = 1byte)
BX_VGA_THIS s.vbe_visable_screen_size = (BX_VGA_THIS s.vbe_xres) * (BX_VGA_THIS s.vbe_yres) * 1;
memset(BX_VGA_THIS s.vbe_memory, 0, BX_VGA_THIS s.vbe_visable_screen_size);
BX_INFO(("VBE enabling x %d, y %d, bpp %d (0=8bpp)", BX_VGA_THIS s.vbe_xres, BX_VGA_THIS s.vbe_yres, BX_VGA_THIS s.vbe_bpp));
bx_gui.dimension_update(BX_VGA_THIS s.vbe_xres, BX_VGA_THIS s.vbe_yres);
}
else
{
BX_INFO(("VBE disabling"));
}
BX_VGA_THIS s.vbe_enabled=(Boolean) value;
} 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.vga_mem_updated = 1;
for (unsigned xti = 0; xti < BX_NUM_X_TILES; xti++) {
for (unsigned yti = 0; yti < BX_NUM_Y_TILES; yti++) {
BX_VGA_THIS s.vga_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.vga_mem_updated = 1;
for (unsigned xti = 0; xti < BX_NUM_X_TILES; xti++) {
for (unsigned yti = 0; yti < BX_NUM_Y_TILES; yti++) {
BX_VGA_THIS s.vga_tile_updated[xti][yti] = 1;
}
}
} break;
case VBE_DISPI_INDEX_VIRT_WIDTH:
{
BX_INFO(("VBE requested virtual width %x",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) / 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 %x",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) / new_height;
BX_INFO(("VBE recalc virtual width %x height %x",new_width, new_height));
}
BX_VGA_THIS s.vbe_virtual_xres=new_width;
BX_VGA_THIS s.vbe_virtual_yres=new_height;
} 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;
}
}
}
#endif
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