X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=pcsx_rearmed.git;a=blobdiff_plain;f=libpcsxcore%2Fpsxbios.c;h=7b2c05fc3cb0523209a9cdb12bc4e16fe5a10424;hp=98943b0680eeb9500c4993b10a393ad5e157b7b2;hb=bf643fd9c59939266ee95021292a08b5d20a250e;hpb=f25c285bec9371ff3f48a140bf1e4a88bd6f779d

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 98943b06..7b2c05fc 100644
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -1,5 +1,6 @@
 /***************************************************************************
- *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
+ *   Copyright (C) 2019 Ryan Schultz, PCSX-df Team, PCSX team, gameblabla, *
+ * 	 dmitrysmagin, senquack												   *
  *                                                                         *
  *   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  *
@@ -17,6 +18,12 @@
  *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
  ***************************************************************************/
 
+/* Gameblabla 2018-2019 : 
+ * Numerous changes to bios calls as well as improvements in order to conform to nocash's findings
+ * for the PSX bios calls. Thanks senquack for helping out with some of the changes
+ * and helping to spot issues and refine my patches.
+ * */
+
 /*
  * Internal simulated HLE BIOS.
  */
@@ -300,6 +307,8 @@ static inline void DeliverEvent(u32 ev, u32 spec) {
 	} else Event[ev][spec].status = EvStALREADY;
 }
 
+static unsigned interrupt_r26=0x8004E8B0;
+
 static inline void SaveRegs() {
 	memcpy(regs, psxRegs.GPR.r, 32*4);
 	regs[32] = psxRegs.GPR.n.lo;
@@ -858,7 +867,6 @@ void psxBios_bcmp() { // 0x29
 
 void psxBios_memcpy() { // 0x2a
 	char *p1 = (char *)Ra0, *p2 = (char *)Ra1;
-	s32 n=0;
 	v0 = a0;
 	if (a0 == 0 || a2 > 0x7FFFFFFF)
 	{
@@ -866,7 +874,6 @@ void psxBios_memcpy() { // 0x2a
 		return;
 	}
 	while ((s32)a2-- > 0) {
-		n++;
 		*p1++ = *p2++;
 	}
 	a2 = 0;
@@ -1219,8 +1226,10 @@ void psxBios_InitHeap() { // 0x39
 	size &= 0xfffffffc;
 
 	heap_addr = (u32 *)Ra0;
-	heap_end = (u32 *)((u8 *)heap_addr + size);
-	*heap_addr = SWAP32(size | 1);
+	heap_size = size;
+	heap_end = (u32 *)((u8 *)heap_addr + heap_size);
+	/* HACKFIX: Commenting out this line fixes GTA2 crash */
+	//*heap_addr = SWAP32(size | 1);
 
 	SysPrintf("InitHeap %x,%x : %x %x\n",a0,a1, (int)((uptr)heap_addr-(uptr)psxM), size);
 
@@ -1548,6 +1557,13 @@ void psxBios_SetMem() { // 9f
 	pc0 = ra;
 }
 
+/* TODO FIXME : Not compliant. -1 indicates failure but using 1 for now. */
+void psxBios_get_cd_status(void) //a6
+{
+	v0 = 1;
+	pc0 = ra;
+}
+
 void psxBios__card_info() { // ab
 #ifdef PSXBIOS_LOG
 	PSXBIOS_LOG("psxBios_%s: %x\n", biosA0n[0xab], a0);
@@ -1926,10 +1942,8 @@ void psxBios_StopPAD() { // 14
 	PSXBIOS_LOG("psxBios_%s\n", biosB0n[0x14]);
 #endif
 	pad_stopped = 1;
-	if (pad_buf == 0){
 	pad_buf1 = NULL;
 	pad_buf2 = NULL;
-	}
 	pc0 = ra;
 }
 
@@ -1963,6 +1977,7 @@ void psxBios_ReturnFromException() { // 17
 	LoadRegs();
 
 	pc0 = psxRegs.CP0.n.EPC;
+	k0 = interrupt_r26;
 	if (psxRegs.CP0.n.Cause & 0x80000000) pc0 += 4;
 
 	psxRegs.CP0.n.Status = (psxRegs.CP0.n.Status & 0xfffffff0) |
@@ -2209,9 +2224,6 @@ void psxBios_puts() { // 3e/3f
 	pc0 = ra;
 }
 
-char ffile[64], *pfile;
-int nfile;
-
 
 /* To avoid any issues with different behaviour when using the libc's own strlen instead.
  * We want to mimic the PSX's behaviour in this case for bufile. */
@@ -2273,7 +2285,7 @@ void psxBios_firstfile() { // 42
 	if (pa0) {
 		strcpy(ffile, pa0);
 		pfile = ffile+5;
-		nfile = 1;
+		nfile = 0;
 		if (!strncmp(pa0, "bu00", 4)) {
 			// firstfile() calls _card_read() internally, so deliver it's event
 			DeliverEvent(0x11, 0x2);
@@ -2593,6 +2605,15 @@ void psxBios__card_status() { // 5c
 	PSXBIOS_LOG("psxBios_%s: %x\n", biosB0n[0x5c], a0);
 #endif
 
+	v0 = card_active_chan;
+	pc0 = ra;
+}
+
+void psxBios__card_wait() { // 5d
+#ifdef PSXBIOS_LOG
+	PSXBIOS_LOG("psxBios_%s: %x\n", biosB0n[0x5d], a0);
+#endif
+
 	v0 = 1;
 	pc0 = ra;
 }
@@ -2844,7 +2865,7 @@ void psxBiosInit() {
 	//biosA0[0xa3] = psxBios_DequeueCdIntr;
 	//biosA0[0xa4] = psxBios_sys_a0_a4;
 	//biosA0[0xa5] = psxBios_ReadSector;
-	//biosA0[0xa6] = psxBios_get_cd_status;
+	biosA0[0xa6] = psxBios_get_cd_status;
 	//biosA0[0xa7] = psxBios_bufs_cb_0;
 	//biosA0[0xa8] = psxBios_bufs_cb_1;
 	//biosA0[0xa9] = psxBios_bufs_cb_2;
@@ -2951,7 +2972,7 @@ void psxBiosInit() {
 	//biosB0[0x5a] = psxBios_sys_b0_5a;
 	biosB0[0x5b] = psxBios_ChangeClearPad;
 	biosB0[0x5c] = psxBios__card_status;
-	//biosB0[0x5d] = psxBios__card_wait;
+	biosB0[0x5d] = psxBios__card_wait;
 //*******************C0 CALLS****************************
 	//biosC0[0x00] = psxBios_InitRCnt;
 	//biosC0[0x01] = psxBios_InitException;
@@ -3005,6 +3026,7 @@ void psxBiosInit() {
 	memset(Thread, 0, sizeof(Thread));
 	Thread[0].status = 2; // main thread
 
+	pad_stopped = 1;
 	jmp_int = NULL;
 	pad_buf = NULL;
 	pad_buf1 = NULL;
@@ -3016,6 +3038,7 @@ void psxBiosInit() {
 	CardState = -1;
 	CurThread = 0;
 	memset(FDesc, 0, sizeof(FDesc));
+	card_active_chan = 0;
 
 	psxMu32ref(0x0150) = SWAPu32(0x160);
 	psxMu32ref(0x0154) = SWAPu32(0x320);
@@ -3029,7 +3052,9 @@ void psxBiosInit() {
 */
 	// opcode HLE
 	psxRu32ref(0x0000) = SWAPu32((0x3b << 26) | 4);
-	psxMu32ref(0x0000) = SWAPu32((0x3b << 26) | 0);
+	/* Whatever this does, it actually breaks CTR, even without the uninitiliazed memory patch. 
+	Normally games shouldn't read from address 0 yet they do. See explanation below in details. */
+	//psxMu32ref(0x0000) = SWAPu32((0x3b << 26) | 0);
 	psxMu32ref(0x00a0) = SWAPu32((0x3b << 26) | 1);
 	psxMu32ref(0x00b0) = SWAPu32((0x3b << 26) | 2);
 	psxMu32ref(0x00c0) = SWAPu32((0x3b << 26) | 3);
@@ -3055,6 +3080,21 @@ void psxBiosInit() {
 	psxHu32ref(0x1060) = SWAPu32(0x00000b88);
 
 	hleSoftCall = FALSE;
+	
+	/*	Some games like R-Types, CTR, Fade to Black read from adress 0x00000000 due to uninitialized pointers.
+		See Garbage Area at Address 00000000h in Nocash PSX Specfications for more information.
+		R-type will work if PsxM[0] is non-zero. (Meaning that it should not be 00000003h as he implies).
+		Crash Team Racing will refuse to boot if psxM[2] and psx[3] are not set to 0.
+		Fade to Black can crash upon memory card access if byte 5 is set to the wrong value.
+	*/
+	psxM[0] = SWAPu32(0x3C);
+	psxM[1] = SWAPu32(0x1A);
+	psxM[2] = SWAPu32(0x00);
+	psxM[3] = SWAPu32(0x00);
+	psxM[4] = SWAPu32(0x27);
+	psxM[5] = SWAPu32(0x5A);
+	psxM[6] = SWAPu32(0x0C);
+	psxM[7] = SWAPu32(0x80);
 }
 
 void psxBiosShutdown() {
@@ -3177,6 +3217,7 @@ void psxBiosException() {
 
 	switch (psxRegs.CP0.n.Cause & 0x3c) {
 		case 0x00: // Interrupt
+			interrupt_r26=psxRegs.CP0.n.EPC;
 #ifdef PSXCPU_LOG
 //			PSXCPU_LOG("interrupt\n");
 #endif
@@ -3275,7 +3316,6 @@ void psxBiosException() {
 void psxBiosFreeze(int Mode) {
 	u32 base = 0x40000;
 
-	pad_stopped = 0;
 	bfreezepsxMptr(jmp_int, u32);
 	bfreezepsxMptr(pad_buf, int);
 	bfreezepsxMptr(pad_buf1, char);
@@ -3290,4 +3330,6 @@ void psxBiosFreeze(int Mode) {
 	bfreezel(&CurThread);
 	bfreezes(FDesc);
 	bfreezel(&card_active_chan);
+	bfreezel(&pad_stopped);
+	bfreezel(&heap_size);
 }