Initial submission of the PCem-Experimental source code.

2016-06-26 00:34:39 +02:00
parent 09d7c4384f
commit fd2a5bc9f5
610 changed files with 184352 additions and 0 deletions
--- a/src/vid_vga.c
+++ b/src/vid_vga.c
@@ -0,0 +1,181 @@
+/*IBM VGA emulation*/
+#include <stdlib.h>
+#include "ibm.h"
+#include "device.h"
+#include "io.h"
+#include "mem.h"
+#include "rom.h"
+#include "video.h"
+#include "vid_svga.h"
+#include "vid_vga.h"
+
+typedef struct vga_t
+{
+        svga_t svga;
+        
+        rom_t bios_rom;
+} vga_t;
+
+void vga_out(uint16_t addr, uint8_t val, void *p)
+{
+        vga_t *vga = (vga_t *)p;
+        svga_t *svga = &vga->svga;
+        uint8_t old;
+        
+//        pclog("vga_out : %04X %02X  %04X:%04X  %02X  %i\n", addr, val, CS,pc, ram[0x489], ins);
+                
+        if (((addr & 0xfff0) == 0x3d0 || (addr & 0xfff0) == 0x3b0) && !(svga->miscout & 1)) 
+                addr ^= 0x60;
+
+        switch (addr)
+        {
+                case 0x3D4:
+                svga->crtcreg = val & 0x1f;
+                return;
+                case 0x3D5:
+		if (svga->crtcreg <= 0x18)
+			val &= mask_crtc[svga->crtcreg];
+                if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
+                        return;
+                if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
+                        val = (svga->crtc[7] & ~0x10) | (val & 0x10);
+                old = svga->crtc[svga->crtcreg];
+                svga->crtc[svga->crtcreg] = val;
+                if (old != val)
+                {
+                        if (svga->crtcreg < 0xe || svga->crtcreg > 0x10)
+                        {
+                                svga->fullchange = changeframecount;
+                                svga_recalctimings(svga);
+                        }
+                }
+                break;
+        }
+        svga_out(addr, val, svga);
+}
+
+uint8_t vga_in(uint16_t addr, void *p)
+{
+        vga_t *vga = (vga_t *)p;
+        svga_t *svga = &vga->svga;
+        uint8_t temp;
+
+//        if (addr != 0x3da) pclog("vga_in : %04X ", addr);
+                
+        if (((addr & 0xfff0) == 0x3d0 || (addr & 0xfff0) == 0x3b0) && !(svga->miscout & 1)) 
+                addr ^= 0x60;
+             
+        switch (addr)
+        {
+                case 0x3D4:
+                temp = svga->crtcreg;
+                break;
+                case 0x3D5:
+                temp = svga->crtc[svga->crtcreg];
+                break;
+                default:
+                temp = svga_in(addr, svga);
+                break;
+        }
+//        if (addr != 0x3da) pclog("%02X  %04X:%04X\n", temp, CS,pc);
+        return temp;
+}
+
+void *vga_init()
+{
+        vga_t *vga = malloc(sizeof(vga_t));
+        memset(vga, 0, sizeof(vga_t));
+
+        rom_init(&vga->bios_rom, "roms/ibm_vga.bin", 0xc0000, 0x8000, 0x7fff, 0x2000, MEM_MAPPING_EXTERNAL);
+
+        svga_init(&vga->svga, vga, 1 << 18, /*256kb*/
+                   NULL,
+                   vga_in, vga_out,
+                   NULL,
+                   NULL);
+
+        io_sethandler(0x03c0, 0x0020, vga_in, NULL, NULL, vga_out, NULL, NULL, vga);
+
+        vga->svga.bpp = 8;
+        vga->svga.miscout = 1;
+        
+        return vga;
+}
+
+/*PS/1 uses a standard VGA controller, but with no option ROM*/
+void *ps1vga_init()
+{
+        vga_t *vga = malloc(sizeof(vga_t));
+        memset(vga, 0, sizeof(vga_t));
+       
+        svga_init(&vga->svga, vga, 1 << 18, /*256kb*/
+                   NULL,
+                   vga_in, vga_out,
+                   NULL,
+                   NULL);
+
+        io_sethandler(0x03c0, 0x0020, vga_in, NULL, NULL, vga_out, NULL, NULL, vga);
+
+        vga->svga.bpp = 8;
+        vga->svga.miscout = 1;
+        
+        return vga;
+}
+
+static int vga_available()
+{
+        return rom_present("roms/ibm_vga.bin");
+}
+
+void vga_close(void *p)
+{
+        vga_t *vga = (vga_t *)p;
+
+        svga_close(&vga->svga);
+        
+        free(vga);
+}
+
+void vga_speed_changed(void *p)
+{
+        vga_t *vga = (vga_t *)p;
+        
+        svga_recalctimings(&vga->svga);
+}
+
+void vga_force_redraw(void *p)
+{
+        vga_t *vga = (vga_t *)p;
+
+        vga->svga.fullchange = changeframecount;
+}
+
+void vga_add_status_info(char *s, int max_len, void *p)
+{
+        vga_t *vga = (vga_t *)p;
+        
+        svga_add_status_info(s, max_len, &vga->svga);
+}
+
+device_t vga_device =
+{
+        "VGA",
+        0,
+        vga_init,
+        vga_close,
+        vga_available,
+        vga_speed_changed,
+        vga_force_redraw,
+        vga_add_status_info
+};
+device_t ps1vga_device =
+{
+        "PS/1 VGA",
+        0,
+        ps1vga_init,
+        vga_close,
+        vga_available,
+        vga_speed_changed,
+        vga_force_redraw,
+        vga_add_status_info
+};