///////////////////////////////////////////////////////////////////////// // $Id: vga.cc,v 1.66 2003-04-26 16:43:22 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) bx_vga_c *theVga = NULL; unsigned old_iHeight = 0, old_iWidth = 0, old_MSL = 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; unsigned x,y; unsigned addr; for (addr=0x03B4; addr<=0x03B5; addr++) { DEV_register_ioread_handler(this, read_handler, addr, "vga video", 7); DEV_register_iowrite_handler(this, write_handler, addr, "vga video", 7); } for (addr=0x03BA; addr<=0x03BA; addr++) { DEV_register_ioread_handler(this, read_handler, addr, "vga video", 7); DEV_register_iowrite_handler(this, write_handler, addr, "vga video", 7); } for (addr=0x03C0; addr<=0x03CF; addr++) { DEV_register_ioread_handler(this, read_handler, addr, "vga video", 7); DEV_register_iowrite_handler(this, write_handler, addr, "vga video", 7); } for (addr=0x03D4; addr<=0x03D5; addr++) { DEV_register_ioread_handler(this, read_handler, addr, "vga video", 7); DEV_register_iowrite_handler(this, write_handler, addr, "vga video", 7); } for (addr=0x03DA; addr<=0x03DA; addr++) { DEV_register_ioread_handler(this, read_handler, addr, "vga video", 7); DEV_register_iowrite_handler(this, write_handler, addr, "vga video", 7); } 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.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); { /* ??? 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=%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.horiz_tick = 0; BX_VGA_THIS s.vert_tick = 0; BX_VGA_THIS s.charmap_address = 0; BX_VGA_THIS s.y_doublescan = 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++) { DEV_register_ioread_handler(this, vbe_read_handler, addr, "vga video", 7); DEV_register_iowrite_handler(this, vbe_write_handler, addr, "vga video", 7); } 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; /* 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; } else { *piWidth = h; *piHeight = v; BX_VGA_THIS s.scan_bits = BX_VGA_THIS s.CRTC.reg[19] << 4; } } else if ((h >= 640) && (v >= 480)) { *piWidth = h; *piHeight = v; BX_VGA_THIS s.scan_bits = BX_VGA_THIS s.CRTC.reg[19] << 4; } } else if ( BX_VGA_THIS s.graphics_ctrl.shift_reg == 2 ) { if ( BX_VGA_THIS s.sequencer.chain_four ) { *piWidth = h; *piHeight = v; BX_VGA_THIS s.scan_bits = BX_VGA_THIS s.CRTC.reg[19] << 3; } else { *piWidth = h; *piHeight = v; BX_VGA_THIS s.scan_bits = BX_VGA_THIS s.CRTC.reg[19] << 1; } } 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 bx_bool 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(("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(("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 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 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(("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 0x03cb: /* not sure but OpenBSD reads it a lot */ 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); 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; bx_bool prev_video_enabled; Bit8u charmap1, charmap2, prev_memory_mapping; bx_bool prev_graphics_alpha, prev_chain_odd_even; bx_bool 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 if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha) { 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); } } } else { memset(BX_VGA_THIS s.text_snapshot, 0, sizeof(BX_VGA_THIS s.text_snapshot)); } } 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(("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.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 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; if (BX_VGA_THIS s.CRTC.reg[0x09] > 0) { BX_VGA_THIS s.charmap_address = (charmap1 << 13); bx_gui->set_text_charmap( & BX_VGA_THIS s.vga_memory[0x20000 + BX_VGA_THIS s.charmap_address]); } if (charmap2 != charmap1) BX_INFO(("char map select: #2=%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 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", value)); // 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; 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); if (needs_update) { // Mark all video as updated so the color changes will go through if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha) { 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); } } } else { memset(BX_VGA_THIS s.text_snapshot, 0, sizeof(BX_VGA_THIS s.text_snapshot)); } } 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; if (prev_graphics_alpha != BX_VGA_THIS s.graphics_ctrl.graphics_alpha) { BX_VGA_THIS s.vga_mem_updated = 1; if (BX_VGA_THIS s.graphics_ctrl.graphics_alpha) { 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)); } } 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==0x09) { BX_VGA_THIS s.y_doublescan = ((value & 0x9f) > 0); } 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_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; /* skip screen update when the sequencer is in reset mode */ if (!BX_VGA_THIS s.sequencer.reset1 || !BX_VGA_THIS s.sequencer.reset2) return; 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; } #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 xti, yti, y_tiles; 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; y_tiles = iHeight / Y_TILESIZE + ((iHeight % Y_TILESIZE) > 0); for (yti=0; ytigraphics_tile_update(BX_VGA_THIS s.tile, xti*X_TILESIZE, yti*Y_TILESIZE); SET_TILE_UPDATED (xti, yti, 0); } } 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; unsigned xti, yti, y_tiles; //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: Bit8u attribute, palette_reg_val, DAC_regno; unsigned long start_addr; determine_screen_dimensions(&iHeight, &iWidth); if( (iWidth != old_iWidth) || (iHeight != old_iHeight) ) { bx_gui->dimension_update(iWidth, iHeight); old_iWidth = iWidth; old_iHeight = iHeight; } if (BX_VGA_THIS s.graphics_ctrl.memory_mapping == 3) { // CGA 640x200x2 y_tiles = iHeight / Y_TILESIZE + ((iHeight % Y_TILESIZE) > 0); for (yti=0; yti>= 1; for (c=0; c> 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; } } bx_gui->graphics_tile_update(BX_VGA_THIS s.tile, xti*X_TILESIZE, yti*Y_TILESIZE); SET_TILE_UPDATED (xti, yti, 0); } } } else { // output data in serial fashion with each display plane // output on its associated serial output. Standard EGA/VGA format start_addr = (BX_VGA_THIS s.CRTC.reg[0x0c] << 8) | BX_VGA_THIS s.CRTC.reg[0x0d]; y_tiles = iHeight / Y_TILESIZE + ((iHeight % Y_TILESIZE) > 0); for (yti=0; yti>= 1; for (c=0; c> 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); SET_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; } y_tiles = iHeight / Y_TILESIZE + ((iHeight % Y_TILESIZE) > 0); for (yti=0; yti> 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); SET_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 plane // (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; } start_addr = (BX_VGA_THIS s.CRTC.reg[0x0c] << 8) | BX_VGA_THIS s.CRTC.reg[0x0d]; y_tiles = iHeight / Y_TILESIZE + ((iHeight % Y_TILESIZE) > 0); for (yti=0; yti>= 1; for (c=0; c> 1; plane = (pixelx % 4); byte_offset = start_addr + (plane * 65536) + (pixely * BX_VGA_THIS s.scan_bits) + (pixelx & ~0x03); 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); SET_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]; y_tiles = iHeight / Y_TILESIZE + ((iHeight % Y_TILESIZE) > 0); for (yti=0; yti>= 1; for (c=0; c> 1; plane = (pixelx % 4); byte_offset = (plane * 65536) + (pixely * BX_VGA_THIS s.scan_bits) + (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); SET_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 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) ) { 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 = 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; } cursor_state = (BX_VGA_THIS s.CRTC.reg[0x0a] << 8) | BX_VGA_THIS 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 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_THIS s.CRTC.reg[0x0a] << 8) | BX_VGA_THIS 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_THIS s.CRTC.reg[0x12] | ((BX_VGA_THIS s.CRTC.reg[0x07]<<7)&0x100) | ((BX_VGA_THIS s.CRTC.reg[0x07]<<3)&0x200); // 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; iWidth = 8 * 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)); iWidth = 8 * (BX_VGA_THIS s.CRTC.reg[1] + 1); iHeight = VDE+1; } if( (iWidth != old_iWidth) || (iHeight != old_iHeight) || (MSL != old_MSL) ) { bx_gui->dimension_update(iWidth, iHeight, MSL+1); old_iWidth = iWidth; old_iHeight = iHeight; old_MSL = MSL; } // 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_THIS s.CRTC.reg[0x0a] << 8) | BX_VGA_THIS 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) && (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 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; 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) && (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 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, x_tileno2, y_tileno, isEven; if ( (addr < 0xB8000) || (addr > 0xBFFFF) ) return; offset = addr - 0xB8000; /* CGA 320x200x4 start */ BX_VGA_THIS s.vga_memory[offset] = value; 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 <<= 1; //2 * y_tileno; x_tileno = offset % (320/4); x_tileno <<= 2; //*=4; } x_tileno2=x_tileno; if (BX_VGA_THIS s.y_doublescan && (BX_VGA_THIS s.graphics_ctrl.shift_reg==0)) { x_tileno2+=7; x_tileno/=(X_TILESIZE/2); x_tileno2/=(X_TILESIZE/2); y_tileno/=(Y_TILESIZE/2); } else { x_tileno2+=3; x_tileno/=X_TILESIZE; x_tileno2/=X_TILESIZE; 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 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 if (BX_VGA_THIS s.y_doublescan) { y_tileno = (offset / BX_VGA_THIS s.scan_bits) / (Y_TILESIZE/2); } else { y_tileno = (offset / BX_VGA_THIS s.scan_bits) / Y_TILESIZE; } x_tileno = (offset % BX_VGA_THIS s.scan_bits) / (X_TILESIZE/2); BX_VGA_THIS s.vga_mem_updated = 1; SET_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; } } /* 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 */ 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 */ new_val[0] |= (cpu_data_b[0] << b) & (BX_VGA_THIS s.graphics_ctrl.latch[0] & and_mask); new_val[1] |= (cpu_data_b[1] << b) & (BX_VGA_THIS s.graphics_ctrl.latch[1] & and_mask); new_val[2] |= (cpu_data_b[2] << b) & (BX_VGA_THIS s.graphics_ctrl.latch[2] & and_mask); new_val[3] |= (cpu_data_b[3] << b) & (BX_VGA_THIS s.graphics_ctrl.latch[3] & and_mask); break; case 2: /* OR */ new_val[0] |= (cpu_data_b[0] << b) | (BX_VGA_THIS s.graphics_ctrl.latch[0] & and_mask); new_val[1] |= (cpu_data_b[1] << b) | (BX_VGA_THIS s.graphics_ctrl.latch[1] & and_mask); new_val[2] |= (cpu_data_b[2] << b) | (BX_VGA_THIS s.graphics_ctrl.latch[2] & and_mask); new_val[3] |= (cpu_data_b[3] << b) | (BX_VGA_THIS s.graphics_ctrl.latch[3] & and_mask); break; case 3: /* XOR */ new_val[0] |= (cpu_data_b[0] << b) ^ (BX_VGA_THIS s.graphics_ctrl.latch[0] & and_mask); new_val[1] |= (cpu_data_b[1] << b) ^ (BX_VGA_THIS s.graphics_ctrl.latch[1] & and_mask); new_val[2] |= (cpu_data_b[2] << b) ^ (BX_VGA_THIS s.graphics_ctrl.latch[2] & and_mask); new_val[3] |= (cpu_data_b[3] << b) ^ (BX_VGA_THIS s.graphics_ctrl.latch[3] & and_mask); break; 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]) { 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; offset -= ((BX_VGA_THIS s.CRTC.reg[0x0c] << 8) | BX_VGA_THIS s.CRTC.reg[0x0d]); if (BX_VGA_THIS s.graphics_ctrl.shift_reg == 2) { x_tileno = (offset % BX_VGA_THIS s.scan_bits) / X_TILESIZE; if (BX_VGA_THIS s.y_doublescan) { y_tileno = (offset / BX_VGA_THIS s.scan_bits) / (Y_TILESIZE / 2); } else { y_tileno = (offset / BX_VGA_THIS s.scan_bits) / Y_TILESIZE; } } else { x_tileno = (offset % (BX_VGA_THIS s.scan_bits/8)) / (X_TILESIZE / 8); if (BX_VGA_THIS s.y_doublescan) { y_tileno = (offset / (BX_VGA_THIS s.scan_bits/8)) / (Y_TILESIZE / 2); } else { y_tileno = (offset / (BX_VGA_THIS s.scan_bits/8)) / 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.CRTC.reg[0x12] | ((BX_VGA_THIS s.CRTC.reg[0x07]<<7)&0x100) | ((BX_VGA_THIS s.CRTC.reg[0x07]<<3)&0x200); 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 (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 (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 < 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)); } } // 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; SET_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")); 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)); 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_4) || (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_KB /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, 4=4bpp)", 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=(bx_bool) 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++) { 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.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 %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