diff options
Diffstat (limited to 'PcsxSrc/PsxMem.c')
| -rw-r--r-- | PcsxSrc/PsxMem.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/PcsxSrc/PsxMem.c b/PcsxSrc/PsxMem.c new file mode 100644 index 0000000..b30aa22 --- /dev/null +++ b/PcsxSrc/PsxMem.c @@ -0,0 +1,250 @@ +/* Pcsx - Pc Psx Emulator
+ * Copyright (C) 1999-2002 Pcsx Team
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <string.h>
+#include <stdlib.h>
+
+#include "PsxCommon.h"
+
+
+int psxMemInit() {
+ int i;
+
+ psxMemLUT = (long*)malloc(0x10000 * 4);
+ memset(psxMemLUT, 0, 0x10000 * 4);
+
+ psxM = (char*)malloc(0x00200000);
+ psxP = (char*)malloc(0x00010000);
+ psxH = (char*)malloc(0x00010000);
+ psxR = (char*)malloc(0x00080000);
+ if (psxMemLUT == NULL || psxM == NULL || psxP == NULL || psxH == NULL || psxR == NULL) {
+ SysMessage("Error allocating memory"); return -1;
+ }
+
+ for (i=0; i<0x80; i++) psxMemLUT[i + 0x0000] = (u32)&psxM[(i & 0x1f) << 16];
+ memcpy(psxMemLUT + 0x8000, psxMemLUT, 0x80 * 4);
+ memcpy(psxMemLUT + 0xa000, psxMemLUT, 0x80 * 4);
+
+ for (i=0; i<0x01; i++) psxMemLUT[i + 0x1f00] = (u32)&psxP[i << 16];
+
+ for (i=0; i<0x01; i++) psxMemLUT[i + 0x1f80] = (u32)&psxH[i << 16];
+
+ for (i=0; i<0x08; i++) psxMemLUT[i + 0xbfc0] = (u32)&psxR[i << 16];
+
+ return 0;
+}
+
+void psxMemReset() {
+ FILE *f = NULL;
+ char Bios[256];
+
+ memset(psxM, 0, 0x00200000);
+ memset(psxP, 0, 0x00010000);
+
+ if (strcmp(Config.Bios, "HLE")) {
+ sprintf(Bios, "%s%s", Config.BiosDir, Config.Bios);
+ f = fopen(Bios, "rb");
+
+ if (f == NULL) {
+ SysMessage ("Could not open bios:\"%s\". Enabling HLE Bios\n", Bios);
+ memset(psxR, 0, 0x80000);
+ Config.HLE = 1;
+ }
+ else {
+ fread(psxR, 1, 0x80000, f);
+ fclose(f);
+ Config.HLE = 0;
+ }
+ } else Config.HLE = 1;
+}
+
+void psxMemShutdown() {
+ free(psxM);
+ free(psxP);
+ free(psxH);
+ free(psxR);
+ free(psxMemLUT);
+}
+
+static int writeok=1;
+
+u8 psxMemRead8(u32 mem) {
+ char *p;
+ u32 t;
+
+ t = mem >> 16;
+ if (t == 0x1f80) {
+ if (mem < 0x1f801000)
+ return psxHu8(mem);
+ else
+ return psxHwRead8(mem);
+ } else {
+ p = (char *)(psxMemLUT[t]);
+ if (p != NULL) {
+ return *(u8 *)(p + (mem & 0xffff));
+ } else {
+#ifdef PSXMEM_LOG
+ PSXMEM_LOG("err lb %8.8lx\n", mem);
+#endif
+ return 0;
+ }
+ }
+}
+
+u16 psxMemRead16(u32 mem) {
+ char *p;
+ u32 t;
+
+ t = mem >> 16;
+ if (t == 0x1f80) {
+ if (mem < 0x1f801000)
+ return psxHu16(mem);
+ else
+ return psxHwRead16(mem);
+ } else {
+ p = (char *)(psxMemLUT[t]);
+ if (p != NULL) {
+ return *(u16 *)(p + (mem & 0xffff));
+ } else {
+#ifdef PSXMEM_LOG
+ PSXMEM_LOG("err lh %8.8lx\n", mem);
+#endif
+ return 0;
+ }
+ }
+}
+
+u32 psxMemRead32(u32 mem) {
+ char *p;
+ u32 t;
+
+ t = mem >> 16;
+ if (t == 0x1f80) {
+ if (mem < 0x1f801000)
+ return psxHu32(mem);
+ else
+ return psxHwRead32(mem);
+ } else {
+ p = (char *)(psxMemLUT[t]);
+ if (p != NULL) {
+ return *(u32 *)(p + (mem & 0xffff));
+ } else {
+#ifdef PSXMEM_LOG
+ if (writeok) PSXMEM_LOG("err lw %8.8lx\n", mem);
+#endif
+ return 0;
+ }
+ }
+}
+
+void psxMemWrite8(u32 mem, u8 value) {
+ char *p;
+ u32 t;
+
+ t = mem >> 16;
+ if (t == 0x1f80) {
+ if (mem < 0x1f801000)
+ psxHu8(mem) = value;
+ else
+ psxHwWrite8(mem, value);
+ } else {
+ p = (char *)(psxMemLUT[t]);
+ if (p != NULL) {
+ *(u8 *)(p + (mem & 0xffff)) = value;
+ psxCpu->Clear(mem, 1);
+ } else {
+#ifdef PSXMEM_LOG
+ PSXMEM_LOG("err sb %8.8lx\n", mem);
+#endif
+ }
+ }
+}
+
+void psxMemWrite16(u32 mem, u16 value) {
+ char *p;
+ u32 t;
+
+ t = mem >> 16;
+ if (t == 0x1f80) {
+ if (mem < 0x1f801000)
+ psxHu16(mem) = value;
+ else
+ psxHwWrite16(mem, value);
+ } else {
+ p = (char *)(psxMemLUT[t]);
+ if (p != NULL) {
+ *(u16 *)(p + (mem & 0xffff)) = value;
+ psxCpu->Clear(mem, 1);
+ } else {
+#ifdef PSXMEM_LOG
+ PSXMEM_LOG("err sh %8.8lx\n", mem);
+#endif
+ }
+ }
+}
+
+void psxMemWrite32(u32 mem, u32 value) {
+ char *p;
+ u32 t;
+
+ t = mem >> 16;
+ if (t == 0x1f80) {
+ if (mem < 0x1f801000)
+ psxHu32(mem) = value;
+ else
+ psxHwWrite32(mem, value);
+ } else {
+ p = (char *)(psxMemLUT[t]);
+ if (p != NULL) {
+ *(u32 *)(p + (mem & 0xffff)) = value;
+ psxCpu->Clear(mem, 1);
+ } else {
+ if (mem != 0xfffe0130) {
+ if (!writeok) psxCpu->Clear(mem, 1);
+#ifdef PSXMEM_LOG
+ if (writeok) { PSXMEM_LOG("err sw %8.8lx\n", mem); }
+#endif
+ } else {
+ int i;
+
+ switch (value) {
+ case 0x800: case 0x804:
+ if (writeok == 0) break;
+ writeok = 0;
+ memset(psxMemLUT + 0x0000, 0, 0x80 * 4);
+ memset(psxMemLUT + 0x8000, 0, 0x80 * 4);
+ memset(psxMemLUT + 0xa000, 0, 0x80 * 4);
+ break;
+ case 0x1e988:
+ if (writeok == 1) break;
+ writeok = 1;
+ for (i=0; i<0x80; i++) psxMemLUT[i + 0x0000] = (u32)&psxM[(i & 0x1f) << 16];
+ memcpy(psxMemLUT + 0x8000, psxMemLUT, 0x80 * 4);
+ memcpy(psxMemLUT + 0xa000, psxMemLUT, 0x80 * 4);
+ break;
+ default:
+#ifdef PSXMEM_LOG
+ PSXMEM_LOG("unk %8.8lx = %x\n", mem, value);
+#endif
+ break;
+ }
+ }
+ }
+ }
+}
+
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