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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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30
src/vid_vga.c
View file

@ -9,6 +9,8 @@
#include "vid_svga.h"
#include "vid_vga.h"
svga_t *mb_vga = NULL;
typedef struct vga_t
{
svga_t svga;
@ -84,6 +86,30 @@ uint8_t vga_in(uint16_t addr, void *p)
return temp;
}
void vga_disable(void *p)
{
vga_t *vga = (vga_t *)p;
svga_t *svga = &vga->svga;
// pclog("vga_disable\n");
io_removehandler(0x03a0, 0x0040, vga_in, NULL, NULL, vga_out, NULL, NULL, vga);
mem_mapping_disable(&svga->mapping);
}
void vga_enable(void *p)
{
vga_t *vga = (vga_t *)p;
svga_t *svga = &vga->svga;
// pclog("vga_enable\n");
io_sethandler(0x03c0, 0x0020, vga_in, NULL, NULL, vga_out, NULL, NULL, vga);
if (!(svga->miscout & 1))
io_sethandler(0x03a0, 0x0020, vga_in, NULL, NULL, vga_out, NULL, NULL, vga);
mem_mapping_enable(&svga->mapping);
}
void *vga_init()
{
vga_t *vga = malloc(sizeof(vga_t));
@ -122,6 +148,8 @@ void *ps1vga_init()
vga->svga.bpp = 8;
vga->svga.miscout = 1;
mb_vga = &vga->svga;
return vga;
}
@ -134,6 +162,8 @@ void vga_close(void *p)
{
vga_t *vga = (vga_t *)p;
mb_vga = NULL;
svga_close(&vga->svga);
free(vga);