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.
26 unsigned char aica_main_ram[2 MB];
27 unsigned char aica_scratch_ram[8 KB];
29 /*************** ARM memory access function blocks **************/
31 static int32_t FASTCALL ext_audioram_read_long( sh4addr_t addr )
33 return *((int32_t *)(aica_main_ram + (addr&0x001FFFFF)));
35 static int32_t FASTCALL ext_audioram_read_word( sh4addr_t addr )
37 return SIGNEXT16(*((int16_t *)(aica_main_ram + (addr&0x001FFFFF))));
39 static int32_t FASTCALL ext_audioram_read_byte( sh4addr_t addr )
41 return SIGNEXT8(*((int16_t *)(aica_main_ram + (addr&0x001FFFFF))));
43 static void FASTCALL ext_audioram_write_long( sh4addr_t addr, uint32_t val )
45 *(uint32_t *)(aica_main_ram + (addr&0x001FFFFF)) = val;
48 static void FASTCALL ext_audioram_write_word( sh4addr_t addr, uint32_t val )
50 *(uint16_t *)(aica_main_ram + (addr&0x001FFFFF)) = (uint16_t)val;
53 static void FASTCALL ext_audioram_write_byte( sh4addr_t addr, uint32_t val )
55 *(uint8_t *)(aica_main_ram + (addr&0x001FFFFF)) = (uint8_t)val;
58 static void FASTCALL ext_audioram_read_burst( unsigned char *dest, sh4addr_t addr )
60 memcpy( dest, aica_main_ram+(addr&0x001FFFFF), 32 );
62 static void FASTCALL ext_audioram_write_burst( sh4addr_t addr, unsigned char *src )
64 memcpy( aica_main_ram+(addr&0x001FFFFF), src, 32 );
67 struct mem_region_fn mem_region_audioram = { ext_audioram_read_long, ext_audioram_write_long,
68 ext_audioram_read_word, ext_audioram_write_word,
69 ext_audioram_read_byte, ext_audioram_write_byte,
70 ext_audioram_read_burst, ext_audioram_write_burst };
73 static int32_t FASTCALL ext_audioscratch_read_long( sh4addr_t addr )
75 return *((int32_t *)(aica_scratch_ram + (addr&0x00001FFF)));
77 static int32_t FASTCALL ext_audioscratch_read_word( sh4addr_t addr )
79 return SIGNEXT16(*((int16_t *)(aica_scratch_ram + (addr&0x00001FFF))));
81 static int32_t FASTCALL ext_audioscratch_read_byte( sh4addr_t addr )
83 return SIGNEXT8(*((int16_t *)(aica_scratch_ram + (addr&0x00001FFF))));
85 static void FASTCALL ext_audioscratch_write_long( sh4addr_t addr, uint32_t val )
87 *(uint32_t *)(aica_scratch_ram + (addr&0x00001FFF)) = val;
90 static void FASTCALL ext_audioscratch_write_word( sh4addr_t addr, uint32_t val )
92 *(uint16_t *)(aica_scratch_ram + (addr&0x00001FFF)) = (uint16_t)val;
95 static void FASTCALL ext_audioscratch_write_byte( sh4addr_t addr, uint32_t val )
97 *(uint8_t *)(aica_scratch_ram + (addr&0x00001FFF)) = (uint8_t)val;
100 static void FASTCALL ext_audioscratch_read_burst( unsigned char *dest, sh4addr_t addr )
102 memcpy( dest, aica_scratch_ram+(addr&0x00001FFF), 32 );
104 static void FASTCALL ext_audioscratch_write_burst( sh4addr_t addr, unsigned char *src )
106 memcpy( aica_scratch_ram+(addr&0x00001FFF), src, 32 );
109 struct mem_region_fn mem_region_audioscratch = { ext_audioscratch_read_long, ext_audioscratch_write_long,
110 ext_audioscratch_read_word, ext_audioscratch_write_word,
111 ext_audioscratch_read_byte, ext_audioscratch_write_byte,
112 ext_audioscratch_read_burst, ext_audioscratch_write_burst };
114 /************************** Local ARM support **************************/
115 int arm_has_page( uint32_t addr ) {
116 return ( addr < 0x00200000 ||
117 (addr >= 0x00800000 && addr <= 0x00805000 ) );
120 uint32_t arm_read_long( uint32_t addr ) {
121 if( addr < 0x00200000 ) {
122 return *(int32_t *)(aica_main_ram + addr);
126 switch( addr & 0xFFFFF000 ) {
128 val = mmio_region_AICA0_read(addr&0x0FFF);
129 // DEBUG( "ARM long read from %08X => %08X", addr, val );
132 val = mmio_region_AICA1_read(addr&0x0FFF);
133 // DEBUG( "ARM long read from %08X => %08X", addr, val );
136 val = mmio_region_AICA2_read(addr&0x0FFF);
137 // DEBUG( "ARM long read from %08X => %08X", addr, val );
141 return *(int32_t *)(aica_scratch_ram + addr - 0x00803000);
144 WARN( "Attempted long read to undefined page: %08X at %08X",
146 /* Undefined memory */
150 uint32_t arm_read_word( uint32_t addr ) {
151 return (uint32_t)(uint16_t)arm_read_long( addr );
154 uint32_t arm_read_byte( uint32_t addr ) {
155 return (uint32_t)(uint8_t)arm_read_long( addr );
158 void arm_write_long( uint32_t addr, uint32_t value )
160 if( addr < 0x00200000 ) {
162 *(uint32_t *)(aica_main_ram + addr) = value;
164 switch( addr & 0xFFFFF000 ) {
166 // DEBUG( "ARM long write to %08X <= %08X", addr, value );
167 mmio_region_AICA0_write(addr&0x0FFF, value);
170 // DEBUG( "ARM long write to %08X <= %08X", addr, value );
171 mmio_region_AICA1_write(addr&0x0FFF, value);
174 // DEBUG( "ARM long write to %08X <= %08X", addr, value );
175 mmio_region_AICA2_write(addr&0x0FFF, value);
179 *(uint32_t *)(aica_scratch_ram + addr - 0x00803000) = value;
182 WARN( "Attempted long write to undefined address: %08X",
184 /* Undefined memory */
190 uint32_t arm_combine_byte( uint32_t addr, uint32_t val, uint8_t byte )
192 switch( addr & 0x03 ) {
194 return (val & 0xFFFFFF00) | byte;
196 return (val & 0xFFFF00FF) | (byte<<8);
198 return (val & 0xFF00FFFF) | (byte<<16);
200 return (val & 0x00FFFFFF) | (byte<<24);
202 return val; // Can't happen, but make gcc happy
205 void arm_write_word( uint32_t addr, uint32_t value )
207 if( addr < 0x00200000 ) {
208 *(uint16_t *)(aica_main_ram + addr) = (uint16_t)value;
213 void arm_write_byte( uint32_t addr, uint32_t value )
215 if( addr < 0x00200000 ) {
217 *(uint8_t *)(aica_main_ram + addr) = (uint8_t)value;
220 switch( addr & 0xFFFFF000 ) {
222 tmp = MMIO_READ( AICA0, addr & 0x0FFC );
223 value = arm_combine_byte( addr, tmp, value );
224 mmio_region_AICA0_write(addr&0x0FFC, value);
227 tmp = MMIO_READ( AICA1, addr & 0x0FFC );
228 value = arm_combine_byte( addr, tmp, value );
229 mmio_region_AICA1_write(addr&0x0FFC, value);
232 tmp = MMIO_READ( AICA2, addr & 0x0FFC );
233 value = arm_combine_byte( addr, tmp, value );
234 mmio_region_AICA2_write(addr&0x0FFC, value);
238 *(uint8_t *)(aica_scratch_ram + addr - 0x00803000) = (uint8_t)value;
241 WARN( "Attempted byte write to undefined address: %08X",
243 /* Undefined memory */
249 /* User translations - TODO */
251 uint32_t arm_read_long_user( uint32_t addr ) {
252 return arm_read_long( addr );
255 uint32_t arm_read_byte_user( uint32_t addr ) {
256 return arm_read_byte( addr );
259 void arm_write_long_user( uint32_t addr, uint32_t val ) {
260 arm_write_long( addr, val );
263 void arm_write_byte_user( uint32_t addr, uint32_t val )
265 arm_write_byte( addr, val );
268 size_t arm_read_phys( unsigned char *buf, uint32_t addr, size_t length ) {
269 if( addr < sizeof(aica_main_ram) ) {
270 if( addr+length > sizeof(aica_main_ram) ) {
271 length = sizeof(aica_main_ram) - addr;
273 memcpy( buf, &aica_main_ram[addr], length );
280 size_t arm_write_phys( uint32_t addr, unsigned char *buf, size_t length ) {
281 if( addr < sizeof(aica_main_ram) ) {
282 if( addr+length > sizeof(aica_main_ram) ) {
283 length = sizeof(aica_main_ram) - addr;
285 memcpy( &aica_main_ram[addr], buf, length );
.