116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/*IBM VGA emulation*/
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#include <stdlib.h>
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#include "ibm.h"
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#include "device.h"
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#include "io.h"
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#include "video.h"
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#include "vid_svga.h"
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#include "vid_vga.h"
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typedef struct vga_t
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{
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svga_t svga;
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} vga_t;
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void vga_out(uint16_t addr, uint8_t val, void *p)
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{
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vga_t *vga = (vga_t *)p;
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svga_t *svga = &vga->svga;
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uint8_t old;
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pclog("vga_out : %04X %02X %04X:%04X %02X %i\n", addr, val, CS,pc, ram[0x489], ins);
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if (((addr & 0xfff0) == 0x3d0 || (addr & 0xfff0) == 0x3b0) && !(svga->miscout & 1))
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addr ^= 0x60;
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switch (addr)
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{
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case 0x3D4:
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svga->crtcreg = val & 0x1f;
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return;
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case 0x3D5:
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if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
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old = svga->crtc[svga->crtcreg];
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svga->crtc[svga->crtcreg] = val;
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if (old != val)
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{
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if (svga->crtcreg < 0xe || svga->crtcreg > 0x10)
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{
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svga->fullchange = changeframecount;
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svga_recalctimings(svga);
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}
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}
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break;
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}
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svga_out(addr, val, svga);
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}
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uint8_t vga_in(uint16_t addr, void *p)
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{
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vga_t *vga = (vga_t *)p;
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svga_t *svga = &vga->svga;
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uint8_t temp;
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if (addr != 0x3da) pclog("vga_in : %04X ", addr);
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if (((addr & 0xfff0) == 0x3d0 || (addr & 0xfff0) == 0x3b0) && !(svga->miscout & 1))
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addr ^= 0x60;
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switch (addr)
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{
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case 0x3D4:
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temp = svga->crtcreg;
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break;
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case 0x3D5:
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temp = svga->crtc[svga->crtcreg];
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break;
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default:
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temp = svga_in(addr, svga);
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break;
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}
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if (addr != 0x3da) pclog("%02X %04X:%04X\n", temp, CS,pc);
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return temp;
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}
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void *vga_init()
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{
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vga_t *vga = malloc(sizeof(vga_t));
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memset(vga, 0, sizeof(vga_t));
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svga_init(&vga->svga, vga, 1 << 18, /*256kb*/
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NULL,
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vga_in, vga_out,
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NULL);
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io_sethandler(0x03c0, 0x0020, vga_in, NULL, NULL, vga_out, NULL, NULL, vga);
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vga->svga.bpp = 8;
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vga->svga.miscout = 1;
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return vga;
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}
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void vga_close(void *p)
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{
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vga_t *vga = (vga_t *)p;
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svga_close(&vga->svga);
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free(vga);
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}
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void vga_speed_changed(void *p)
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{
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vga_t *vga = (vga_t *)p;
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svga_recalctimings(&vga->svga);
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}
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device_t vga_device =
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{
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"VGA",
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vga_init,
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vga_close,
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vga_speed_changed,
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svga_add_status_info
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};
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