Search
lxdream.org :: lxdream/src/mem.c
lxdream 0.9.1
released Jun 29
Download Now
filename src/mem.c
changeset 146:f91fa34ab219
prev72:ceb5985fa8d8
next156:3b93648a3b07
author nkeynes
date Sat May 20 02:38:58 2006 +0000 (14 years ago)
permissions -rw-r--r--
last change Add repeating memory mode
Load flash as ram rather than rom
view annotate diff log raw
     1 /**
     2  * $Id: mem.c,v 1.12 2006-05-20 02:38:58 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  */
    18 #define MODULE mem_module
    20 #include <sys/mman.h>
    21 #include <sys/stat.h>
    22 #include <assert.h>
    23 #include <stdint.h>
    24 #include <stdlib.h>
    25 #include <stdio.h>
    26 #include <unistd.h>
    27 #include <fcntl.h>
    28 #include <errno.h>
    29 #include <string.h>
    30 #include <zlib.h>
    31 #include "dream.h"
    32 #include "mem.h"
    33 #include "mmio.h"
    34 #include "dreamcast.h"
    36 char **page_map = NULL;
    38 int mem_load(FILE *f);
    39 void mem_save(FILE *f);
    40 struct dreamcast_module mem_module =
    41     { "MEM", mem_init, mem_reset, NULL, NULL, NULL, mem_save, mem_load };
    43 struct mem_region mem_rgn[MAX_MEM_REGIONS];
    44 struct mmio_region *io_rgn[MAX_IO_REGIONS];
    45 struct mmio_region *P4_io[4096];
    47 int num_io_rgns = 0, num_mem_rgns = 0;
    49 void *mem_alloc_pages( int n )
    50 {
    51     void *mem = mmap( NULL, n * 4096,
    52                       PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0 );
    53     if( mem == MAP_FAILED ) {
    54         ERROR( "Memory allocation failure! (%s)", strerror(errno) );
    55         return NULL;
    56     }
    57     return mem;
    58 }
    61 void mem_init( void )
    62 {
    63     page_map = mmap( NULL, sizeof(char *) * PAGE_TABLE_ENTRIES,
    64                      PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0 );
    65     if( page_map == MAP_FAILED ) {
    66         ERROR( "Unable to allocate page map! (%s)", strerror(errno) );
    67         page_map = NULL;
    68         return;
    69     }
    71     memset( page_map, 0, sizeof(uint32_t) * PAGE_TABLE_ENTRIES );
    72 }
    74 void mem_reset( void )
    75 {
    76     /* Restore all mmio registers to their initial settings */
    77     int i, j;
    78     for( i=1; i<num_io_rgns; i++ ) {
    79         for( j=0; io_rgn[i]->ports[j].id != NULL; j++ ) {
    80             if( io_rgn[i]->ports[j].def_val != UNDEFINED &&
    81                 io_rgn[i]->ports[j].def_val != *io_rgn[i]->ports[j].val ) {
    82                 io_rgn[i]->io_write( io_rgn[i]->ports[j].offset,
    83                                     io_rgn[i]->ports[j].def_val );
    84             }
    85         }
    86     }
    87 }
    89 void mem_save( FILE *f ) 
    90 {
    91     int i;
    92     uint32_t len;
    94     /* All memory regions */
    95     fwrite( &num_mem_rgns, sizeof(num_mem_rgns), 1, f );
    96     for( i=0; i<num_mem_rgns; i++ ) {
    97 	fwrite_string( mem_rgn[i].name, f );
    98 	fwrite( &mem_rgn[i].base, sizeof(uint32_t), 1, f );
    99 	fwrite( &mem_rgn[i].flags, sizeof(int), 1, f );
   100 	fwrite( &mem_rgn[i].size, sizeof(uint32_t), 1, f );
   101 	if( mem_rgn[i].flags != MEM_FLAG_ROM )
   102 	    fwrite( mem_rgn[i].mem, mem_rgn[i].size, 1, f );
   103     }
   105     /* All MMIO regions */
   106     fwrite( &num_io_rgns, sizeof(num_io_rgns), 1, f );
   107     for( i=0; i<num_io_rgns; i++ ) {
   108 	fwrite_string( io_rgn[i]->id, f );
   109 	fwrite( &io_rgn[i]->base, sizeof( uint32_t ), 1, f );
   110 	len = 4096;
   111 	fwrite( &len, sizeof(len), 1, f );
   112 	fwrite( io_rgn[i]->mem, len, 1, f );
   113     }
   114 }
   116 int mem_load( FILE *f )
   117 {
   118     char tmp[64];
   119     uint32_t len;
   120     uint32_t base, size;
   121     int flags;
   122     int i;
   124     /* All memory regions */
   125     fread( &len, sizeof(len), 1, f );
   126     if( len != num_mem_rgns )
   127 	return -1;
   128     for( i=0; i<len; i++ ) {
   129 	fread_string( tmp, sizeof(tmp), f );
   130 	fread( &base, sizeof(base), 1, f );
   131 	fread( &flags, sizeof(flags), 1, f );
   132 	fread( &size, sizeof(size), 1, f );
   133 	if( strcmp( mem_rgn[i].name, tmp ) != 0 ||
   134 	    base != mem_rgn[i].base ||
   135 	    flags != mem_rgn[i].flags ||
   136 	    size != mem_rgn[i].size ) {
   137 	    ERROR( "Bad memory region %d %s", i, tmp );
   138 	    return -1;
   139 	}
   140 	if( flags != MEM_FLAG_ROM )
   141 	    fread( mem_rgn[i].mem, size, 1, f );
   142     }
   144     /* All MMIO regions */
   145     fread( &len, sizeof(len), 1, f );
   146     if( len != num_io_rgns ) 
   147 	return -1;
   148     for( i=0; i<len; i++ ) {
   149 	fread_string( tmp, sizeof(tmp), f );
   150 	fread( &base, sizeof(base), 1, f );
   151 	fread( &size, sizeof(size), 1, f );
   152 	if( strcmp( io_rgn[i]->id, tmp ) != 0 ||
   153 	    base != io_rgn[i]->base ||
   154 	    size != 4096 ) {
   155 	    ERROR( "Bad MMIO region %d %s", i, tmp );
   156 	    return -1;
   157 	}
   158 	fread( io_rgn[i]->mem, size, 1, f );
   159     }
   160     return 0;
   161 }
   163 int mem_save_block( const gchar *file, uint32_t start, uint32_t length )
   164 {
   165     char *region;
   166     int len = 4096, total = 0;
   167     uint32_t addr = start;
   168     struct stat st;
   169     FILE *f = fopen(file,"w");
   171     if( f == NULL )
   172 	return errno;
   174     while( total < length ) {
   175 	region = mem_get_region(addr);
   176 	len = 4096 - (addr & 0x0FFF);
   177 	if( len > (length-total) ) 
   178 	    len = (length-total);
   179 	if( fwrite( region, len, 1, f ) != 1 ) {
   180 	    ERROR( "Unexpected error: %d %d", len, errno );
   181 	    break;
   182 	}
   184 	addr += len;
   185 	total += len;
   186     }
   187     fclose( f );
   188     INFO( "Loaded %d of %d bytes to %08X", total, length, start );
   189     return 0;
   190 }
   192 int mem_load_block( const gchar *file, uint32_t start, uint32_t length )
   193 {
   194     char *region;
   195     int len = 4096, total = 0;
   196     uint32_t addr = start;
   197     struct stat st;
   198     FILE *f = fopen(file,"r");
   200     if( f == NULL )
   201 	return errno;
   202     fstat( fileno(f), &st );
   203     if( length == 0 || length == -1 || length > st.st_size )
   204 	length = st.st_size;
   206     while( total < length ) {
   207 	region = mem_get_region(addr);
   208 	len = 4096 - (addr & 0x0FFF);
   209 	if( len > (length-total) ) 
   210 	    len = (length-total);
   211 	if( fread( region, len, 1, f ) != 1 ) {
   212 	    ERROR( "Unexpected error: %d %d", len, errno );
   213 	    break;
   214 	}
   216 	addr += len;
   217 	total += len;
   218     }
   219     fclose( f );
   220     INFO( "Loaded %d of %d bytes to %08X", total, length, start );
   221     return 0;
   222 }
   224 struct mem_region *mem_map_region( void *mem, uint32_t base, uint32_t size,
   225                                    char *name, int flags, uint32_t repeat_offset,
   226 				   uint32_t repeat_until )
   227 {
   228     int i;
   229     mem_rgn[num_mem_rgns].base = base;
   230     mem_rgn[num_mem_rgns].size = size;
   231     mem_rgn[num_mem_rgns].flags = flags;
   232     mem_rgn[num_mem_rgns].name = name;
   233     mem_rgn[num_mem_rgns].mem = mem;
   234     num_mem_rgns++;
   236     do {
   237 	for( i=0; i<size>>PAGE_BITS; i++ )
   238 	    page_map[(base>>PAGE_BITS)+i] = mem + (i<<PAGE_BITS);
   239 	base += repeat_offset;	
   240     } while( base <= repeat_until );
   242     return &mem_rgn[num_mem_rgns-1];
   243 }
   245 void *mem_create_ram_region( uint32_t base, uint32_t size, char *name )
   246 {
   247     return mem_create_repeating_ram_region( base, size, name, size, base );
   248 }
   250 void *mem_create_repeating_ram_region( uint32_t base, uint32_t size, char *name,
   251 				       uint32_t repeat_offset, uint32_t repeat_until )
   252 {
   253     char *mem;
   255     assert( (base&0xFFFFF000) == base ); /* must be page aligned */
   256     assert( (size&0x00000FFF) == 0 );
   257     assert( num_mem_rgns < MAX_MEM_REGIONS );
   258     assert( page_map != NULL );
   260     mem = mem_alloc_pages( size>>PAGE_BITS );
   262     mem_map_region( mem, base, size, name, MEM_FLAG_RAM, repeat_offset, repeat_until );
   264     return mem;
   265 }
   267 void *mem_load_rom( char *file, uint32_t base, uint32_t size, uint32_t crc )
   268 {
   269     char buf[512], *mem;
   270     int fd;
   271     uint32_t calc_crc;
   272     snprintf( buf, 512, "%s/%s",BIOS_PATH, file );
   273     fd = open( buf, O_RDONLY );
   274     if( fd == -1 ) {
   275         ERROR( "Bios file not found: %s", buf );
   276         return NULL;
   277     }
   278     mem = mmap( NULL, size, PROT_READ, MAP_PRIVATE, fd, 0 );
   279     if( mem == MAP_FAILED ) {
   280         ERROR( "Unable to map bios file: %s (%s)", file, strerror(errno) );
   281         close(fd);
   282         return NULL;
   283     }
   284     mem_map_region( mem, base, size, file, MEM_FLAG_ROM, size, base );
   286     /* CRC check */
   287     calc_crc = crc32(0L, mem, size);
   288     if( calc_crc != crc ) {
   289         WARN( "Bios CRC Mismatch in %s: %08X (expected %08X)",
   290               file, calc_crc, crc);
   291     }
   293     return mem;
   294 }
   296 char *mem_get_region_by_name( char *name )
   297 {
   298     int i;
   299     for( i=0; i<num_mem_rgns; i++ ) {
   300         if( strcmp( mem_rgn[i].name, name ) == 0 )
   301             return mem_rgn[i].mem;
   302     }
   303     return NULL;
   304 }
   306 void register_io_region( struct mmio_region *io )
   307 {
   308     int i;
   310     assert(io);
   311     io->mem = mem_alloc_pages(2);
   312     io->save_mem = io->mem + PAGE_SIZE;
   313     io->index = (struct mmio_port **)malloc(1024*sizeof(struct mmio_port *));
   314     io->trace_flag = 0;
   315     memset( io->index, 0, 1024*sizeof(struct mmio_port *) );
   316     for( i=0; io->ports[i].id != NULL; i++ ) {
   317         io->ports[i].val = (uint32_t *)(io->mem + io->ports[i].offset);
   318         *io->ports[i].val = io->ports[i].def_val;
   319         io->index[io->ports[i].offset>>2] = &io->ports[i];
   320     }
   321     memcpy( io->save_mem, io->mem, PAGE_SIZE );
   322     if( (io->base & 0xFF000000) == 0xFF000000 ) {
   323         /* P4 area (on-chip I/O channels */
   324         P4_io[(io->base&0x1FFFFFFF)>>19] = io;
   325     } else {
   326         page_map[io->base>>12] = (char *)num_io_rgns;
   327     }
   328     io_rgn[num_io_rgns] = io;
   329     num_io_rgns++;
   330 }
   332 void register_io_regions( struct mmio_region **io )
   333 {
   334     while( *io ) register_io_region( *io++ );
   335 }
   337 int mem_has_page( uint32_t addr )
   338 {
   339     char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
   340     return page != NULL;
   341 }
   343 char *mem_get_page( uint32_t addr )
   344 {
   345     char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
   346     return page;
   347 }
   349 char *mem_get_region( uint32_t addr )
   350 {
   351     char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
   352     if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */
   353         return NULL;
   354     } else {
   355         return page+(addr&0xFFF);
   356     }
   357 }
.