4 * Implements the ARM's memory map.
6 * Copyright (c) 2005 Nathan Keynes.
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.
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.
25 unsigned char *arm_mem = NULL;
26 unsigned char *arm_mem_scratch = NULL;
29 arm_mem = mem_get_region_by_name( MEM_REGION_AUDIO );
30 arm_mem_scratch = mem_get_region_by_name( MEM_REGION_AUDIO_SCRATCH );
33 int arm_has_page( uint32_t addr ) {
34 return ( addr < 0x00200000 ||
35 (addr >= 0x00800000 && addr <= 0x00805000 ) );
38 uint32_t arm_read_long( uint32_t addr ) {
39 if( addr < 0x00200000 ) {
40 return *(int32_t *)(arm_mem + addr);
44 switch( addr & 0xFFFFF000 ) {
46 val = mmio_region_AICA0_read(addr&0x0FFF);
47 // DEBUG( "ARM long read from %08X => %08X", addr, val );
50 val = mmio_region_AICA1_read(addr&0x0FFF);
51 // DEBUG( "ARM long read from %08X => %08X", addr, val );
54 val = mmio_region_AICA2_read(addr&0x0FFF);
55 // DEBUG( "ARM long read from %08X => %08X", addr, val );
59 return *(int32_t *)(arm_mem_scratch + addr - 0x00803000);
62 ERROR( "Attempted long read to undefined page: %08X at %08X",
64 /* Undefined memory */
68 uint32_t arm_read_word( uint32_t addr ) {
69 return (uint32_t)(uint16_t)arm_read_long( addr );
72 uint32_t arm_read_byte( uint32_t addr ) {
73 return (uint32_t)(uint8_t)arm_read_long( addr );
76 void arm_write_long( uint32_t addr, uint32_t value )
78 if( addr < 0x00200000 ) {
80 *(uint32_t *)(arm_mem + addr) = value;
82 switch( addr & 0xFFFFF000 ) {
84 // DEBUG( "ARM long write to %08X <= %08X", addr, value );
85 mmio_region_AICA0_write(addr&0x0FFF, value);
88 // DEBUG( "ARM long write to %08X <= %08X", addr, value );
89 mmio_region_AICA1_write(addr&0x0FFF, value);
92 // DEBUG( "ARM long write to %08X <= %08X", addr, value );
93 mmio_region_AICA2_write(addr&0x0FFF, value);
97 *(uint32_t *)(arm_mem_scratch + addr - 0x00803000) = value;
100 ERROR( "Attempted long write to undefined address: %08X",
102 /* Undefined memory */
108 uint32_t arm_combine_byte( uint32_t addr, uint32_t val, uint8_t byte )
110 switch( addr & 0x03 ) {
112 return (val & 0xFFFFFF00) | byte;
114 return (val & 0xFFFF00FF) | (byte<<8);
116 return (val & 0xFF00FFFF) | (byte<<16);
118 return (val & 0x00FFFFFF) | (byte<<24);
120 return val; // Can't happen, but make gcc happy
123 void arm_write_word( uint32_t addr, uint32_t value )
125 if( addr < 0x00200000 ) {
126 *(uint16_t *)(arm_mem + addr) = (uint16_t)value;
131 void arm_write_byte( uint32_t addr, uint32_t value )
133 if( addr < 0x00200000 ) {
135 *(uint8_t *)(arm_mem + addr) = (uint8_t)value;
138 switch( addr & 0xFFFFF000 ) {
140 tmp = MMIO_READ( AICA0, addr & 0x0FFC );
141 value = arm_combine_byte( addr, tmp, value );
142 mmio_region_AICA0_write(addr&0x0FFC, value);
145 tmp = MMIO_READ( AICA1, addr & 0x0FFC );
146 value = arm_combine_byte( addr, tmp, value );
147 mmio_region_AICA1_write(addr&0x0FFC, value);
150 tmp = MMIO_READ( AICA2, addr & 0x0FFC );
151 value = arm_combine_byte( addr, tmp, value );
152 mmio_region_AICA2_write(addr&0x0FFC, value);
156 *(uint8_t *)(arm_mem_scratch + addr - 0x00803000) = (uint8_t)value;
159 ERROR( "Attempted byte write to undefined address: %08X",
161 /* Undefined memory */
167 /* User translations - TODO */
169 uint32_t arm_read_long_user( uint32_t addr ) {
170 return arm_read_long( addr );
173 uint32_t arm_read_byte_user( uint32_t addr ) {
174 return arm_read_byte( addr );
177 void arm_write_long_user( uint32_t addr, uint32_t val ) {
178 arm_write_long( addr, val );
181 void arm_write_byte_user( uint32_t addr, uint32_t val )
183 arm_write_byte( addr, val );
.