nkeynes@31 | 1 | /**
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nkeynes@561 | 2 | * $Id$
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nkeynes@31 | 3 | *
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nkeynes@31 | 4 | * Implements the ARM's memory map.
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nkeynes@31 | 5 | *
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nkeynes@31 | 6 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@31 | 7 | *
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nkeynes@31 | 8 | * This program is free software; you can redistribute it and/or modify
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nkeynes@31 | 9 | * it under the terms of the GNU General Public License as published by
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nkeynes@31 | 10 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@31 | 11 | * (at your option) any later version.
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nkeynes@31 | 12 | *
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nkeynes@31 | 13 | * This program is distributed in the hope that it will be useful,
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nkeynes@31 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@31 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@31 | 16 | * GNU General Public License for more details.
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nkeynes@31 | 17 | */
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nkeynes@31 | 18 |
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nkeynes@11 | 19 | #include <stdlib.h>
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nkeynes@11 | 20 | #include "dream.h"
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nkeynes@7 | 21 | #include "mem.h"
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nkeynes@66 | 22 | #include "aica.h"
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nkeynes@7 | 23 |
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nkeynes@502 | 24 | unsigned char *arm_mem = NULL;
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nkeynes@502 | 25 | unsigned char *arm_mem_scratch = NULL;
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nkeynes@11 | 26 |
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nkeynes@7 | 27 | void arm_mem_init() {
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nkeynes@11 | 28 | arm_mem = mem_get_region_by_name( MEM_REGION_AUDIO );
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nkeynes@40 | 29 | arm_mem_scratch = mem_get_region_by_name( MEM_REGION_AUDIO_SCRATCH );
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nkeynes@7 | 30 | }
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nkeynes@7 | 31 |
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nkeynes@14 | 32 | int arm_has_page( uint32_t addr ) {
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nkeynes@14 | 33 | return ( addr < 0x00200000 ||
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nkeynes@736 | 34 | (addr >= 0x00800000 && addr <= 0x00805000 ) );
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nkeynes@14 | 35 | }
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nkeynes@14 | 36 |
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nkeynes@37 | 37 | uint32_t arm_read_long( uint32_t addr ) {
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nkeynes@11 | 38 | if( addr < 0x00200000 ) {
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nkeynes@736 | 39 | return *(int32_t *)(arm_mem + addr);
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nkeynes@736 | 40 | /* Main sound ram */
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nkeynes@11 | 41 | } else {
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nkeynes@736 | 42 | uint32_t val;
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nkeynes@736 | 43 | switch( addr & 0xFFFFF000 ) {
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nkeynes@736 | 44 | case 0x00800000:
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nkeynes@736 | 45 | val = mmio_region_AICA0_read(addr&0x0FFF);
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nkeynes@736 | 46 | // DEBUG( "ARM long read from %08X => %08X", addr, val );
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nkeynes@736 | 47 | return val;
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nkeynes@736 | 48 | case 0x00801000:
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nkeynes@736 | 49 | val = mmio_region_AICA1_read(addr&0x0FFF);
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nkeynes@736 | 50 | // DEBUG( "ARM long read from %08X => %08X", addr, val );
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nkeynes@736 | 51 | return val;
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nkeynes@736 | 52 | case 0x00802000:
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nkeynes@736 | 53 | val = mmio_region_AICA2_read(addr&0x0FFF);
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nkeynes@736 | 54 | // DEBUG( "ARM long read from %08X => %08X", addr, val );
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nkeynes@736 | 55 | return val;
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nkeynes@736 | 56 | case 0x00803000:
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nkeynes@736 | 57 | case 0x00804000:
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nkeynes@736 | 58 | return *(int32_t *)(arm_mem_scratch + addr - 0x00803000);
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nkeynes@736 | 59 | }
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nkeynes@11 | 60 | }
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nkeynes@37 | 61 | ERROR( "Attempted long read to undefined page: %08X",
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nkeynes@736 | 62 | addr );
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nkeynes@37 | 63 | /* Undefined memory */
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nkeynes@37 | 64 | return 0;
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nkeynes@7 | 65 | }
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nkeynes@7 | 66 |
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nkeynes@37 | 67 | uint32_t arm_read_word( uint32_t addr ) {
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nkeynes@40 | 68 | return (uint32_t)(uint16_t)arm_read_long( addr );
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nkeynes@7 | 69 | }
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nkeynes@7 | 70 |
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nkeynes@37 | 71 | uint32_t arm_read_byte( uint32_t addr ) {
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nkeynes@40 | 72 | return (uint32_t)(uint8_t)arm_read_long( addr );
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nkeynes@7 | 73 | }
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nkeynes@7 | 74 |
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nkeynes@37 | 75 | void arm_write_long( uint32_t addr, uint32_t value )
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nkeynes@37 | 76 | {
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nkeynes@37 | 77 | if( addr < 0x00200000 ) {
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nkeynes@736 | 78 | /* Main sound ram */
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nkeynes@736 | 79 | *(uint32_t *)(arm_mem + addr) = value;
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nkeynes@37 | 80 | } else {
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nkeynes@736 | 81 | switch( addr & 0xFFFFF000 ) {
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nkeynes@736 | 82 | case 0x00800000:
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nkeynes@736 | 83 | // DEBUG( "ARM long write to %08X <= %08X", addr, value );
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nkeynes@736 | 84 | mmio_region_AICA0_write(addr&0x0FFF, value);
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nkeynes@736 | 85 | break;
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nkeynes@736 | 86 | case 0x00801000:
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nkeynes@736 | 87 | // DEBUG( "ARM long write to %08X <= %08X", addr, value );
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nkeynes@736 | 88 | mmio_region_AICA1_write(addr&0x0FFF, value);
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nkeynes@736 | 89 | break;
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nkeynes@736 | 90 | case 0x00802000:
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nkeynes@736 | 91 | // DEBUG( "ARM long write to %08X <= %08X", addr, value );
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nkeynes@736 | 92 | mmio_region_AICA2_write(addr&0x0FFF, value);
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nkeynes@736 | 93 | break;
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nkeynes@736 | 94 | case 0x00803000:
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nkeynes@736 | 95 | case 0x00804000:
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nkeynes@736 | 96 | *(uint32_t *)(arm_mem_scratch + addr - 0x00803000) = value;
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nkeynes@736 | 97 | break;
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nkeynes@736 | 98 | default:
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nkeynes@736 | 99 | ERROR( "Attempted long write to undefined address: %08X",
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nkeynes@736 | 100 | addr );
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nkeynes@736 | 101 | /* Undefined memory */
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nkeynes@736 | 102 | }
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nkeynes@37 | 103 | }
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nkeynes@431 | 104 | return;
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nkeynes@37 | 105 | }
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nkeynes@37 | 106 |
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nkeynes@66 | 107 | uint32_t arm_combine_byte( uint32_t addr, uint32_t val, uint8_t byte )
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nkeynes@66 | 108 | {
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nkeynes@66 | 109 | switch( addr & 0x03 ) {
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nkeynes@66 | 110 | case 0:
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nkeynes@736 | 111 | return (val & 0xFFFFFF00) | byte;
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nkeynes@66 | 112 | case 1:
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nkeynes@736 | 113 | return (val & 0xFFFF00FF) | (byte<<8);
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nkeynes@66 | 114 | case 2:
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nkeynes@736 | 115 | return (val & 0xFF00FFFF) | (byte<<16);
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nkeynes@66 | 116 | case 3:
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nkeynes@736 | 117 | return (val & 0x00FFFFFF) | (byte<<24);
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nkeynes@431 | 118 | default:
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nkeynes@736 | 119 | return val; // Can't happen, but make gcc happy
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nkeynes@66 | 120 | }
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nkeynes@66 | 121 | }
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nkeynes@66 | 122 |
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nkeynes@37 | 123 | void arm_write_byte( uint32_t addr, uint32_t value )
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nkeynes@37 | 124 | {
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nkeynes@37 | 125 | if( addr < 0x00200000 ) {
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nkeynes@736 | 126 | /* Main sound ram */
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nkeynes@736 | 127 | *(uint8_t *)(arm_mem + addr) = (uint8_t)value;
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nkeynes@37 | 128 | } else {
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nkeynes@736 | 129 | uint32_t tmp;
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nkeynes@736 | 130 | switch( addr & 0xFFFFF000 ) {
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nkeynes@736 | 131 | case 0x00800000:
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nkeynes@736 | 132 | tmp = MMIO_READ( AICA0, addr & 0x0FFC );
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nkeynes@736 | 133 | value = arm_combine_byte( addr, tmp, value );
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nkeynes@736 | 134 | mmio_region_AICA0_write(addr&0x0FFC, value);
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nkeynes@736 | 135 | break;
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nkeynes@736 | 136 | case 0x00801000:
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nkeynes@736 | 137 | tmp = MMIO_READ( AICA1, addr & 0x0FFC );
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nkeynes@736 | 138 | value = arm_combine_byte( addr, tmp, value );
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nkeynes@736 | 139 | mmio_region_AICA1_write(addr&0x0FFC, value);
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nkeynes@736 | 140 | break;
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nkeynes@736 | 141 | case 0x00802000:
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nkeynes@736 | 142 | tmp = MMIO_READ( AICA2, addr & 0x0FFC );
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nkeynes@736 | 143 | value = arm_combine_byte( addr, tmp, value );
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nkeynes@736 | 144 | mmio_region_AICA2_write(addr&0x0FFC, value);
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nkeynes@736 | 145 | break;
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nkeynes@736 | 146 | case 0x00803000:
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nkeynes@736 | 147 | case 0x00804000:
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nkeynes@736 | 148 | *(uint8_t *)(arm_mem_scratch + addr - 0x00803000) = (uint8_t)value;
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nkeynes@736 | 149 | break;
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nkeynes@736 | 150 | default:
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nkeynes@736 | 151 | ERROR( "Attempted byte write to undefined address: %08X",
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nkeynes@736 | 152 | addr );
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nkeynes@736 | 153 | /* Undefined memory */
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nkeynes@736 | 154 | }
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nkeynes@37 | 155 | }
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nkeynes@431 | 156 | return;
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nkeynes@37 | 157 | }
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nkeynes@37 | 158 |
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nkeynes@37 | 159 | /* User translations - TODO */
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nkeynes@37 | 160 |
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nkeynes@11 | 161 | uint32_t arm_read_long_user( uint32_t addr ) {
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nkeynes@37 | 162 | return arm_read_long( addr );
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nkeynes@11 | 163 | }
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nkeynes@11 | 164 |
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nkeynes@11 | 165 | uint32_t arm_read_byte_user( uint32_t addr ) {
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nkeynes@37 | 166 | return arm_read_byte( addr );
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nkeynes@37 | 167 | }
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nkeynes@11 | 168 |
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nkeynes@37 | 169 | void arm_write_long_user( uint32_t addr, uint32_t val ) {
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nkeynes@37 | 170 | arm_write_long( addr, val );
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nkeynes@11 | 171 | }
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nkeynes@37 | 172 |
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nkeynes@37 | 173 | void arm_write_byte_user( uint32_t addr, uint32_t val )
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nkeynes@37 | 174 | {
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nkeynes@37 | 175 | arm_write_byte( addr, val );
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nkeynes@37 | 176 | }
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