[pcsx_rearmed.git] / libpcsxcore / psxmem.c

/***************************************************************************
 *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, 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.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
 ***************************************************************************/

/*
* PSX memory functions.
*/

// TODO: Implement caches & cycle penalty.

#include "psxmem.h"
#include "r3000a.h"
#include "psxhw.h"
#include <sys/mman.h>

#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif

s8 *psxM = NULL; // Kernel & User Memory (2 Meg)
s8 *psxP = NULL; // Parallel Port (64K)
s8 *psxR = NULL; // BIOS ROM (512K)
s8 *psxH = NULL; // Scratch Pad (1K) & Hardware Registers (8K)

u8 **psxMemWLUT = NULL;
u8 **psxMemRLUT = NULL;

/*  Playstation Memory Map (from Playstation doc by Joshua Walker)
0x0000_0000-0x0000_ffff		Kernel (64K)
0x0001_0000-0x001f_ffff		User Memory (1.9 Meg)

0x1f00_0000-0x1f00_ffff		Parallel Port (64K)

0x1f80_0000-0x1f80_03ff		Scratch Pad (1024 bytes)

0x1f80_1000-0x1f80_2fff		Hardware Registers (8K)

0x1fc0_0000-0x1fc7_ffff		BIOS (512K)

0x8000_0000-0x801f_ffff		Kernel and User Memory Mirror (2 Meg) Cached
0x9fc0_0000-0x9fc7_ffff		BIOS Mirror (512K) Cached

0xa000_0000-0xa01f_ffff		Kernel and User Memory Mirror (2 Meg) Uncached
0xbfc0_0000-0xbfc7_ffff		BIOS Mirror (512K) Uncached
*/

int psxMemInit() {
	int i;

	psxMemRLUT = (u8 **)malloc(0x10000 * sizeof(void *));
	psxMemWLUT = (u8 **)malloc(0x10000 * sizeof(void *));
	memset(psxMemRLUT, 0, 0x10000 * sizeof(void *));
	memset(psxMemWLUT, 0, 0x10000 * sizeof(void *));

	psxM = mmap((void *)0x80000000, 0x00220000,
		PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

	psxP = &psxM[0x200000];
	psxH = &psxM[0x210000];

	psxR = (s8 *)malloc(0x00080000);

	if (psxMemRLUT == NULL || psxMemWLUT == NULL || 
		psxM != (void *)0x80000000 || psxP == NULL || psxH == NULL) {
		SysMessage(_("Error allocating memory!"));
		return -1;
	}

// MemR
	for (i = 0; i < 0x80; i++) psxMemRLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];

	memcpy(psxMemRLUT + 0x8000, psxMemRLUT, 0x80 * sizeof(void *));
	memcpy(psxMemRLUT + 0xa000, psxMemRLUT, 0x80 * sizeof(void *));

	psxMemRLUT[0x1f00] = (u8 *)psxP;
	psxMemRLUT[0x1f80] = (u8 *)psxH;

	for (i = 0; i < 0x08; i++) psxMemRLUT[i + 0x1fc0] = (u8 *)&psxR[i << 16];

	memcpy(psxMemRLUT + 0x9fc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
	memcpy(psxMemRLUT + 0xbfc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));

// MemW
	for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];

	memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
	memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));

	psxMemWLUT[0x1f00] = (u8 *)psxP;
	psxMemWLUT[0x1f80] = (u8 *)psxH;

	return 0;
}

void psxMemReset() {
	FILE *f = NULL;
	char bios[1024];

	memset(psxM, 0, 0x00200000);
	memset(psxP, 0, 0x00010000);

	if (strcmp(Config.Bios, "HLE") != 0) {
		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 = TRUE;
		} else {
			fread(psxR, 1, 0x80000, f);
			fclose(f);
			Config.HLE = FALSE;
		}
	} else Config.HLE = TRUE;
}

void psxMemShutdown() {
	munmap(psxM, 0x00220000);

	free(psxR);
	free(psxMemRLUT);
	free(psxMemWLUT);
}

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 *)(psxMemRLUT[t]);
		if (p != NULL) {
			if (Config.Debug)
				DebugCheckBP((mem & 0xffffff) | 0x80000000, R1);
			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 *)(psxMemRLUT[t]);
		if (p != NULL) {
			if (Config.Debug)
				DebugCheckBP((mem & 0xffffff) | 0x80000000, R2);
			return SWAPu16(*(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 *)(psxMemRLUT[t]);
		if (p != NULL) {
			if (Config.Debug)
				DebugCheckBP((mem & 0xffffff) | 0x80000000, R4);
			return SWAPu32(*(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 *)(psxMemWLUT[t]);
		if (p != NULL) {
			if (Config.Debug)
				DebugCheckBP((mem & 0xffffff) | 0x80000000, W1);
			*(u8 *)(p + (mem & 0xffff)) = value;
#ifdef PSXREC
			psxCpu->Clear((mem & (~3)), 1);
#endif
		} 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)
			psxHu16ref(mem) = SWAPu16(value);
		else
			psxHwWrite16(mem, value);
	} else {
		p = (char *)(psxMemWLUT[t]);
		if (p != NULL) {
			if (Config.Debug)
				DebugCheckBP((mem & 0xffffff) | 0x80000000, W2);
			*(u16 *)(p + (mem & 0xffff)) = SWAPu16(value);
#ifdef PSXREC
			psxCpu->Clear((mem & (~1)), 1);
#endif
		} else {
#ifdef PSXMEM_LOG
			PSXMEM_LOG("err sh %8.8lx\n", mem);
#endif
		}
	}
}

void psxMemWrite32(u32 mem, u32 value) {
	char *p;
	u32 t;

//	if ((mem&0x1fffff) == 0x71E18 || value == 0x48088800) SysPrintf("t2fix!!\n");
	t = mem >> 16;
	if (t == 0x1f80) {
		if (mem < 0x1f801000)
			psxHu32ref(mem) = SWAPu32(value);
		else
			psxHwWrite32(mem, value);
	} else {
		p = (char *)(psxMemWLUT[t]);
		if (p != NULL) {
			if (Config.Debug)
				DebugCheckBP((mem & 0xffffff) | 0x80000000, W4);
			*(u32 *)(p + (mem & 0xffff)) = SWAPu32(value);
#ifdef PSXREC
			psxCpu->Clear(mem, 1);
#endif
		} else {
			if (mem != 0xfffe0130) {
#ifdef PSXREC
				if (!writeok)
					psxCpu->Clear(mem, 1);
#endif

#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(psxMemWLUT + 0x0000, 0, 0x80 * sizeof(void *));
						memset(psxMemWLUT + 0x8000, 0, 0x80 * sizeof(void *));
						memset(psxMemWLUT + 0xa000, 0, 0x80 * sizeof(void *));
						break;
					case 0x00: case 0x1e988:
						if (writeok == 1) break;
						writeok = 1;
						for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (void *)&psxM[(i & 0x1f) << 16];
						memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
						memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
						break;
					default:
#ifdef PSXMEM_LOG
						PSXMEM_LOG("unk %8.8lx = %x\n", mem, value);
#endif
						break;
				}
			}
		}
	}
}

void *psxMemPointer(u32 mem) {
	char *p;
	u32 t;

	t = mem >> 16;
	if (t == 0x1f80) {
		if (mem < 0x1f801000)
			return (void *)&psxH[mem];
		else
			return NULL;
	} else {
		p = (char *)(psxMemWLUT[t]);
		if (p != NULL) {
			return (void *)(p + (mem & 0xffff));
		}
		return NULL;
	}
}
Commit	Line	Data
ef79bbde P	1	/***************************************************************************
	2	* Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team *
	3	* *
	4	* This program is free software; you can redistribute it and/or modify *
	5	* it under the terms of the GNU General Public License as published by *
	6	* the Free Software Foundation; either version 2 of the License, or *
	7	* (at your option) any later version. *
	8	* *
	9	* This program is distributed in the hope that it will be useful, *
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
	12	* GNU General Public License for more details. *
	13	* *
	14	* You should have received a copy of the GNU General Public License *
	15	* along with this program; if not, write to the *
	16	* Free Software Foundation, Inc., *
	17	* 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA. *
	18	***************************************************************************/
	19
	20	/*
	21	* PSX memory functions.
	22	*/
	23
	24	// TODO: Implement caches & cycle penalty.
	25
	26	#include "psxmem.h"
	27	#include "r3000a.h"
	28	#include "psxhw.h"
	29	#include <sys/mman.h>
	30
	31	#ifndef MAP_ANONYMOUS
	32	#define MAP_ANONYMOUS MAP_ANON
	33	#endif
	34
	35	s8 *psxM = NULL; // Kernel & User Memory (2 Meg)
	36	s8 *psxP = NULL; // Parallel Port (64K)
	37	s8 *psxR = NULL; // BIOS ROM (512K)
	38	s8 *psxH = NULL; // Scratch Pad (1K) & Hardware Registers (8K)
	39
	40	u8 **psxMemWLUT = NULL;
	41	u8 **psxMemRLUT = NULL;
	42
	43	/* Playstation Memory Map (from Playstation doc by Joshua Walker)
	44	0x0000_0000-0x0000_ffff Kernel (64K)
	45	0x0001_0000-0x001f_ffff User Memory (1.9 Meg)
	46
	47	0x1f00_0000-0x1f00_ffff Parallel Port (64K)
	48
	49	0x1f80_0000-0x1f80_03ff Scratch Pad (1024 bytes)
	50
	51	0x1f80_1000-0x1f80_2fff Hardware Registers (8K)
	52
	53	0x1fc0_0000-0x1fc7_ffff BIOS (512K)
	54
	55	0x8000_0000-0x801f_ffff Kernel and User Memory Mirror (2 Meg) Cached
	56	0x9fc0_0000-0x9fc7_ffff BIOS Mirror (512K) Cached
	57
	58	0xa000_0000-0xa01f_ffff Kernel and User Memory Mirror (2 Meg) Uncached
	59	0xbfc0_0000-0xbfc7_ffff BIOS Mirror (512K) Uncached
	60	*/
	61
	62	int psxMemInit() {
	63	int i;
	64
65	psxMemRLUT = (u8 *)malloc(0x10000 sizeof(void *));
66	psxMemWLUT = (u8 *)malloc(0x10000 sizeof(void *));
67	memset(psxMemRLUT, 0, 0x10000 * sizeof(void *));
68	memset(psxMemWLUT, 0, 0x10000 * sizeof(void *));
69
f95a77f7	70	psxM = mmap((void *)0x80000000, 0x00220000,
ef79bbde P	71	PROT_WRITE \| PROT_READ, MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
	72
	73	psxP = &psxM[0x200000];
	74	psxH = &psxM[0x210000];
	75
	76	psxR = (s8 *)malloc(0x00080000);
	77
	78	if (psxMemRLUT == NULL \|\| psxMemWLUT == NULL \|\|
f95a77f7	79	psxM != (void *)0x80000000 \|\| psxP == NULL \|\| psxH == NULL) {
ef79bbde P	80	SysMessage(_("Error allocating memory!"));
	81	return -1;
	82	}
	83
	84	// MemR
	85	for (i = 0; i < 0x80; i++) psxMemRLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];
	86
	87	memcpy(psxMemRLUT + 0x8000, psxMemRLUT, 0x80 * sizeof(void *));
	88	memcpy(psxMemRLUT + 0xa000, psxMemRLUT, 0x80 * sizeof(void *));
	89
	90	psxMemRLUT[0x1f00] = (u8 *)psxP;
	91	psxMemRLUT[0x1f80] = (u8 *)psxH;
	92
	93	for (i = 0; i < 0x08; i++) psxMemRLUT[i + 0x1fc0] = (u8 *)&psxR[i << 16];
	94
	95	memcpy(psxMemRLUT + 0x9fc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
	96	memcpy(psxMemRLUT + 0xbfc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
	97
	98	// MemW
	99	for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];
	100
	101	memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
	102	memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
	103
	104	psxMemWLUT[0x1f00] = (u8 *)psxP;
	105	psxMemWLUT[0x1f80] = (u8 *)psxH;
	106
	107	return 0;
	108	}
	109
	110	void psxMemReset() {
	111	FILE *f = NULL;
	112	char bios[1024];
	113
	114	memset(psxM, 0, 0x00200000);
	115	memset(psxP, 0, 0x00010000);
	116
	117	if (strcmp(Config.Bios, "HLE") != 0) {
	118	sprintf(bios, "%s/%s", Config.BiosDir, Config.Bios);
	119	f = fopen(bios, "rb");
	120
	121	if (f == NULL) {
	122	SysMessage(_("Could not open BIOS:\"%s\". Enabling HLE Bios!\n"), bios);
	123	memset(psxR, 0, 0x80000);
	124	Config.HLE = TRUE;
	125	} else {
	126	fread(psxR, 1, 0x80000, f);
	127	fclose(f);
	128	Config.HLE = FALSE;
	129	}
	130	} else Config.HLE = TRUE;
	131	}
	132
	133	void psxMemShutdown() {
	134	munmap(psxM, 0x00220000);
	135
	136	free(psxR);
	137	free(psxMemRLUT);
	138	free(psxMemWLUT);
	139	}
	140
	141	static int writeok = 1;
	142
	143	u8 psxMemRead8(u32 mem) {
144	char *p;
145	u32 t;
146
147	t = mem >> 16;
148	if (t == 0x1f80) {
149	if (mem < 0x1f801000)
150	return psxHu8(mem);
151	else
152	return psxHwRead8(mem);
153	} else {
154	p = (char *)(psxMemRLUT[t]);
155	if (p != NULL) {
156	if (Config.Debug)
157	DebugCheckBP((mem & 0xffffff) \| 0x80000000, R1);
158	return (u8 )(p + (mem & 0xffff));
159	} else {
160	#ifdef PSXMEM_LOG
161	PSXMEM_LOG("err lb %8.8lx\n", mem);
162	#endif
163	return 0;
164	}
165	}
166	}
167
168	u16 psxMemRead16(u32 mem) {
169	char *p;
170	u32 t;
171
172	t = mem >> 16;
173	if (t == 0x1f80) {
174	if (mem < 0x1f801000)
175	return psxHu16(mem);
176	else
177	return psxHwRead16(mem);
178	} else {
179	p = (char *)(psxMemRLUT[t]);
180	if (p != NULL) {
181	if (Config.Debug)
182	DebugCheckBP((mem & 0xffffff) \| 0x80000000, R2);
183	return SWAPu16((u16 )(p + (mem & 0xffff)));
184	} else {
185	#ifdef PSXMEM_LOG
186	PSXMEM_LOG("err lh %8.8lx\n", mem);
187	#endif
188	return 0;
189	}
190	}
191	}
192
193	u32 psxMemRead32(u32 mem) {
194	char *p;
195	u32 t;
196
197	t = mem >> 16;
198	if (t == 0x1f80) {
199	if (mem < 0x1f801000)
200	return psxHu32(mem);
201	else
202	return psxHwRead32(mem);
203	} else {
204	p = (char *)(psxMemRLUT[t]);
205	if (p != NULL) {
206	if (Config.Debug)
207	DebugCheckBP((mem & 0xffffff) \| 0x80000000, R4);
208	return SWAPu32((u32 )(p + (mem & 0xffff)));
209	} else {
210	#ifdef PSXMEM_LOG
211	if (writeok) { PSXMEM_LOG("err lw %8.8lx\n", mem); }
212	#endif
213	return 0;
214	}
215	}
216	}
217
218	void psxMemWrite8(u32 mem, u8 value) {
219	char *p;
220	u32 t;
221
222	t = mem >> 16;
223	if (t == 0x1f80) {
224	if (mem < 0x1f801000)
225	psxHu8(mem) = value;
226	else
227	psxHwWrite8(mem, value);
228	} else {
229	p = (char *)(psxMemWLUT[t]);
230	if (p != NULL) {
231	if (Config.Debug)
232	DebugCheckBP((mem & 0xffffff) \| 0x80000000, W1);
233	(u8 )(p + (mem & 0xffff)) = value;
234	#ifdef PSXREC
235	psxCpu->Clear((mem & (~3)), 1);
236	#endif
237	} else {
238	#ifdef PSXMEM_LOG
239	PSXMEM_LOG("err sb %8.8lx\n", mem);
240	#endif
241	}
242	}
243	}
244
245	void psxMemWrite16(u32 mem, u16 value) {
246	char *p;
247	u32 t;
248
249	t = mem >> 16;
250	if (t == 0x1f80) {
251	if (mem < 0x1f801000)
252	psxHu16ref(mem) = SWAPu16(value);
253	else
254	psxHwWrite16(mem, value);
255	} else {
256	p = (char *)(psxMemWLUT[t]);
257	if (p != NULL) {
258	if (Config.Debug)
259	DebugCheckBP((mem & 0xffffff) \| 0x80000000, W2);
260	(u16 )(p + (mem & 0xffff)) = SWAPu16(value);
261	#ifdef PSXREC
262	psxCpu->Clear((mem & (~1)), 1);
263	#endif
264	} else {
265	#ifdef PSXMEM_LOG
266	PSXMEM_LOG("err sh %8.8lx\n", mem);
267	#endif
268	}
269	}
270	}
271
272	void psxMemWrite32(u32 mem, u32 value) {
273	char *p;
274	u32 t;
275
276	// if ((mem&0x1fffff) == 0x71E18 \|\| value == 0x48088800) SysPrintf("t2fix!!\n");
277	t = mem >> 16;
278	if (t == 0x1f80) {
279	if (mem < 0x1f801000)
280	psxHu32ref(mem) = SWAPu32(value);
281	else
282	psxHwWrite32(mem, value);
283	} else {
284	p = (char *)(psxMemWLUT[t]);
285	if (p != NULL) {
286	if (Config.Debug)
287	DebugCheckBP((mem & 0xffffff) \| 0x80000000, W4);
288	(u32 )(p + (mem & 0xffff)) = SWAPu32(value);
289	#ifdef PSXREC
290	psxCpu->Clear(mem, 1);
291	#endif
292	} else {
293	if (mem != 0xfffe0130) {
294	#ifdef PSXREC
295	if (!writeok)
296	psxCpu->Clear(mem, 1);
297	#endif
298
299	#ifdef PSXMEM_LOG
300	if (writeok) { PSXMEM_LOG("err sw %8.8lx\n", mem); }
301	#endif
302	} else {
303	int i;
304
305	switch (value) {
306	case 0x800: case 0x804:
307	if (writeok == 0) break;
308	writeok = 0;
309	memset(psxMemWLUT + 0x0000, 0, 0x80 * sizeof(void *));
310	memset(psxMemWLUT + 0x8000, 0, 0x80 * sizeof(void *));
311	memset(psxMemWLUT + 0xa000, 0, 0x80 * sizeof(void *));
312	break;
313	case 0x00: case 0x1e988:
314	if (writeok == 1) break;
315	writeok = 1;
316	for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (void *)&psxM[(i & 0x1f) << 16];
317	memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
318	memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
319	break;
320	default:
321	#ifdef PSXMEM_LOG
322	PSXMEM_LOG("unk %8.8lx = %x\n", mem, value);
323	#endif
324	break;
325	}
326	}
327	}
328	}
329	}
330
331	void *psxMemPointer(u32 mem) {
332	char *p;
333	u32 t;
334
335	t = mem >> 16;
336	if (t == 0x1f80) {
337	if (mem < 0x1f801000)
338	return (void *)&psxH[mem];
339	else
340	return NULL;
341	} else {
342	p = (char *)(psxMemWLUT[t]);
343	if (p != NULL) {
344	return (void *)(p + (mem & 0xffff));
345	}
346	return NULL;
347	}
348	}