Initial submission of the PCem-Experimental source code.
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OBattler
189
src/vid_ps1_svga.c
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189
src/vid_ps1_svga.c
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/*Emulation of the SVGA chip in the IBM PS/1 Model 2121, or at least the
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20 MHz version.
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I am not entirely sure what this chip actually is, possibly a CF62011? I can
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not find any documentation on the chip so have implemented enough to pass
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self-test in the PS/1 BIOS. It has 512kb video memory but I have not found any
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native drivers for any operating system and there is no VBE implementation, so
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it's just a VGA for now.
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*/
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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 "mem.h"
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#include "rom.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 ps1_m2121_svga_t
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{
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svga_t svga;
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rom_t bios_rom;
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uint8_t banking;
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uint8_t reg_2100;
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uint8_t reg_210a;
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} ps1_m2121_svga_t;
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void ps1_m2121_svga_out(uint16_t addr, uint8_t val, void *p)
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{
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ps1_m2121_svga_t *ps1 = (ps1_m2121_svga_t *)p;
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svga_t *svga = &ps1->svga;
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uint8_t old;
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// pclog("svga_out : %04X %02X %04X:%04X %02X %i\n", addr, val, CS,cpu_state.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 <= 0x18)
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val &= mask_crtc[svga->crtcreg];
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if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
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return;
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if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
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val = (svga->crtc[7] & ~0x10) | (val & 0x10);
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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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case 0x2100:
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ps1->reg_2100 = val;
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if ((val & 7) < 4)
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svga->read_bank = svga->write_bank = 0;
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else
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svga->read_bank = svga->write_bank = (ps1->banking & 0x7) * 0x10000;
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break;
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case 0x2108:
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if ((ps1->reg_2100 & 7) >= 4)
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svga->read_bank = svga->write_bank = (val & 0x7) * 0x10000;
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ps1->banking = val;
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break;
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case 0x210a:
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ps1->reg_210a = val;
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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 ps1_m2121_svga_in(uint16_t addr, void *p)
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{
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ps1_m2121_svga_t *ps1 = (ps1_m2121_svga_t *)p;
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svga_t *svga = &ps1->svga;
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uint8_t temp;
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// if (addr != 0x3da) pclog("svga_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 0x100:
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temp = 0xfe;
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break;
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case 0x101:
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temp = 0xe8;
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break;
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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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case 0x2108:
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temp = ps1->banking;
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break;
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case 0x210a:
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temp = ps1->reg_210a;
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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 *ps1_m2121_svga_init()
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{
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ps1_m2121_svga_t *ps1 = malloc(sizeof(ps1_m2121_svga_t));
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memset(ps1, 0, sizeof(ps1_m2121_svga_t));
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svga_init(&ps1->svga, ps1, 1 << 19, /*512kb*/
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NULL,
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ps1_m2121_svga_in, ps1_m2121_svga_out,
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NULL,
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NULL);
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io_sethandler(0x0100, 0x0002, ps1_m2121_svga_in, NULL, NULL, ps1_m2121_svga_out, NULL, NULL, ps1);
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io_sethandler(0x03c0, 0x0020, ps1_m2121_svga_in, NULL, NULL, ps1_m2121_svga_out, NULL, NULL, ps1);
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io_sethandler(0x2100, 0x0010, ps1_m2121_svga_in, NULL, NULL, ps1_m2121_svga_out, NULL, NULL, ps1);
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// io_sethandler(0x210a, 0x0001, ps1_m2121_svga_in, NULL, NULL, ps1_m2121_svga_out, NULL, NULL, ps1);
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ps1->svga.bpp = 8;
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ps1->svga.miscout = 1;
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return ps1;
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}
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void ps1_m2121_svga_close(void *p)
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{
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ps1_m2121_svga_t *ps1 = (ps1_m2121_svga_t *)p;
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svga_close(&ps1->svga);
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free(ps1);
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}
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void ps1_m2121_svga_speed_changed(void *p)
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{
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ps1_m2121_svga_t *ps1 = (ps1_m2121_svga_t *)p;
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svga_recalctimings(&ps1->svga);
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}
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void ps1_m2121_svga_force_redraw(void *p)
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{
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ps1_m2121_svga_t *ps1 = (ps1_m2121_svga_t *)p;
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ps1->svga.fullchange = changeframecount;
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}
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void ps1_m2121_svga_add_status_info(char *s, int max_len, void *p)
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{
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ps1_m2121_svga_t *ps1 = (ps1_m2121_svga_t *)p;
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svga_add_status_info(s, max_len, &ps1->svga);
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}
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device_t ps1_m2121_svga_device =
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{
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"PS/1 Model 2121 SVGA",
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0,
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ps1_m2121_svga_init,
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ps1_m2121_svga_close,
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NULL,
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ps1_m2121_svga_speed_changed,
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ps1_m2121_svga_force_redraw,
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ps1_m2121_svga_add_status_info
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};
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