filename | src/mem.c |
changeset | 10:c898b37506e0 |
next | 11:0a82ef380c45 |
author | nkeynes |
date | Sun Dec 11 05:15:36 2005 +0000 (18 years ago) |
permissions | -rw-r--r-- |
last change | Add CPU disasembly options to mode dropdown Split sh4/mem.c into core mem.c and sh4/mem.c Start adding copyright comments to file headers |
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1 /**
2 * $Id: mem.c,v 1.1 2005-12-11 05:15:36 nkeynes Exp $
3 * mem.c is responsible for creating and maintaining the overall system memory
4 * map, as visible from the SH4 processor.
5 *
6 * Copyright (c) 2005 Nathan Keynes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
19 #include <sys/mman.h>
20 #include <assert.h>
21 #include <stdint.h>
22 #include <stdlib.h>
23 #include <stdio.h>
24 #include <unistd.h>
25 #include <fcntl.h>
26 #include <errno.h>
27 #include <string.h>
28 #include <zlib.h>
29 #include "dream.h"
30 #include "mem.h"
31 #include "mmio.h"
32 #include "dreamcast.h"
34 char **page_map = NULL;
36 struct mem_region mem_rgn[MAX_MEM_REGIONS];
37 struct mmio_region *io_rgn[MAX_IO_REGIONS];
38 struct mmio_region *P4_io[4096];
40 int num_io_rgns = 1, num_mem_rgns = 0;
42 void *mem_alloc_pages( int n )
43 {
44 void *mem = mmap( NULL, n * 4096,
45 PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0 );
46 if( mem == MAP_FAILED ) {
47 ERROR( "Memory allocation failure! (%s)", strerror(errno) );
48 return NULL;
49 }
50 return mem;
51 }
54 void mem_init( void )
55 {
56 page_map = mmap( NULL, sizeof(char *) * PAGE_TABLE_ENTRIES,
57 PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0 );
58 if( page_map == MAP_FAILED ) {
59 ERROR( "Unable to allocate page map! (%s)", strerror(errno) );
60 page_map = NULL;
61 return;
62 }
64 memset( page_map, 0, sizeof(uint32_t) * PAGE_TABLE_ENTRIES );
65 }
67 void mem_reset( void )
68 {
69 /* Restore all mmio registers to their initial settings */
70 int i, j;
71 for( i=1; i<num_io_rgns; i++ ) {
72 for( j=0; io_rgn[i]->ports[j].id != NULL; j++ ) {
73 if( io_rgn[i]->ports[j].def_val != UNDEFINED &&
74 io_rgn[i]->ports[j].def_val != *io_rgn[i]->ports[j].val ) {
75 io_rgn[i]->io_write( io_rgn[i]->ports[j].offset,
76 io_rgn[i]->ports[j].def_val );
77 }
78 }
79 }
80 }
82 struct mem_region *mem_map_region( void *mem, uint32_t base, uint32_t size,
83 char *name, int flags )
84 {
85 int i;
86 mem_rgn[num_mem_rgns].base = base;
87 mem_rgn[num_mem_rgns].size = size;
88 mem_rgn[num_mem_rgns].flags = flags;
89 mem_rgn[num_mem_rgns].name = name;
90 mem_rgn[num_mem_rgns].mem = mem;
91 num_mem_rgns++;
93 for( i=0; i<size>>PAGE_BITS; i++ )
94 page_map[(base>>PAGE_BITS)+i] = mem + (i<<PAGE_BITS);
96 return &mem_rgn[num_mem_rgns-1];
97 }
99 void *mem_create_ram_region( uint32_t base, uint32_t size, char *name )
100 {
101 char *mem;
103 assert( (base&0xFFFFF000) == base ); /* must be page aligned */
104 assert( (size&0x00000FFF) == 0 );
105 assert( num_mem_rgns < MAX_MEM_REGIONS );
106 assert( page_map != NULL );
108 mem = mem_alloc_pages( size>>PAGE_BITS );
110 mem_map_region( mem, base, size, name, 6 );
111 return mem;
112 }
114 void *mem_load_rom( char *file, uint32_t base, uint32_t size, uint32_t crc )
115 {
116 char buf[512], *mem;
117 int fd;
118 uint32_t calc_crc;
119 snprintf( buf, 512, "%s/%s",BIOS_PATH, file );
120 fd = open( buf, O_RDONLY );
121 if( fd == -1 ) {
122 ERROR( "Bios file not found: %s", buf );
123 return NULL;
124 }
125 mem = mmap( NULL, size, PROT_READ, MAP_PRIVATE, fd, 0 );
126 if( mem == MAP_FAILED ) {
127 ERROR( "Unable to map bios file: %s (%s)", file, strerror(errno) );
128 close(fd);
129 return NULL;
130 }
131 mem_map_region( mem, base, size, file, 4 );
133 /* CRC check */
134 calc_crc = crc32(0L, mem, size);
135 if( calc_crc != crc ) {
136 WARN( "Bios CRC Mismatch in %s: %08X (expected %08X)",
137 file, calc_crc, crc);
138 }
139 return mem;
140 }
142 char *mem_get_region_by_name( char *name )
143 {
144 int i;
145 for( i=0; i<num_mem_rgns; i++ ) {
146 if( strcmp( mem_rgn[i].name, name ) == 0 )
147 return mem_rgn[i].mem;
148 }
149 return NULL;
150 }
152 void register_io_region( struct mmio_region *io )
153 {
154 int i;
156 assert(io);
157 io->mem = mem_alloc_pages(2);
158 io->save_mem = io->mem + PAGE_SIZE;
159 io->index = (struct mmio_port **)malloc(1024*sizeof(struct mmio_port *));
160 io->trace_flag = 1;
161 memset( io->index, 0, 1024*sizeof(struct mmio_port *) );
162 for( i=0; io->ports[i].id != NULL; i++ ) {
163 io->ports[i].val = (uint32_t *)(io->mem + io->ports[i].offset);
164 *io->ports[i].val = io->ports[i].def_val;
165 io->index[io->ports[i].offset>>2] = &io->ports[i];
166 }
167 memcpy( io->save_mem, io->mem, PAGE_SIZE );
168 if( (io->base & 0xFF000000) == 0xFF000000 ) {
169 /* P4 area (on-chip I/O channels */
170 P4_io[(io->base&0x1FFFFFFF)>>19] = io;
171 } else {
172 page_map[io->base>>12] = (char *)num_io_rgns;
173 }
174 io_rgn[num_io_rgns] = io;
175 num_io_rgns++;
176 }
178 void register_io_regions( struct mmio_region **io )
179 {
180 while( *io ) register_io_region( *io++ );
181 }
183 int mem_has_page( uint32_t addr )
184 {
185 char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
186 return page != NULL;
187 }
189 char *mem_get_page( uint32_t addr )
190 {
191 char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
192 return page;
193 }
195 char *mem_get_region( uint32_t addr )
196 {
197 char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
198 if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */
199 return NULL;
200 } else {
201 return page+(addr&0xFFF);
202 }
203 }
.