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Added Cirrus Logic GD5428 emulation.

Browse source 
As part of this, added emulation of the GD5428-based IBM 1MB SVGA Adapter/A,
along with support for external graphics cards on MCA platforms, adding the
ability to override the onboard VGA controller.
This commit is contained in:
SarahW 2020-02-01 16:30:34 +00:00
commit 68a2d8cb3c
14 changed files with 342 additions and 43 deletions
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15
src/ps2_mca.c
View file

@ -9,6 +9,7 @@
#include "ps2_nvr.h"
#include "rom.h"
#include "serial.h"
#include "vid_vga.h"
#include "x86.h"
//static uint8_t ps2_92, ps2_94, ps2_102, ps2_103, ps2_104, ps2_105, ps2_190;
@ -652,6 +653,8 @@ static void ps2_mca_write(uint16_t port, uint8_t val, void *p)
ps2.setup = val;
break;
case 0x96:
if ((val & 0x80) && !(ps2.adapter_setup & 0x80))
mca_reset();
ps2.adapter_setup = val;
mca_set_index(val & 7);
break;
@ -671,7 +674,15 @@ static void ps2_mca_write(uint16_t port, uint8_t val, void *p)
if (!(ps2.setup & PS2_SETUP_IO))
ps2.planar_write(port, val);
else if (!(ps2.setup & PS2_SETUP_VGA))
{
if (mb_vga)
{
vga_disable(mb_vga);
if (val & 1)
vga_enable(mb_vga);
}
ps2.pos_vga = val;
}
else if (ps2.adapter_setup & PS2_ADAPTER_SETUP)
mca_write(port, val);
break;
@ -1018,7 +1029,7 @@ void ps2_mca_board_model_70_type34_init(int is_type4)
break;
}
mca_add(ps2_mem_expansion_read, ps2_mem_expansion_write, NULL);
mca_add(ps2_mem_expansion_read, ps2_mem_expansion_write, NULL, NULL);
mem_mapping_add(&ps2.expansion_mapping,
0x800000,
(mem_size - 8192)*1024,
@ -1119,7 +1130,7 @@ void ps2_mca_board_model_80_type2_init()
break;
}
mca_add(ps2_mem_expansion_read, ps2_mem_expansion_write, NULL);
mca_add(ps2_mem_expansion_read, ps2_mem_expansion_write, NULL, NULL);
mem_mapping_add(&ps2.expansion_mapping,
0x400000,
(mem_size - 4096)*1024,