lxdream 0.9.1| filename | src/aica/armmem.c |
| changeset | 40:852ee31ace0d |
| prev | 37:1d84f4c18816 |
| next | 66:2ec5b6eb75e5 |
| author | nkeynes |
| date | Tue Dec 27 12:42:29 2005 +0000 (18 years ago) |
| permissions | -rw-r--r-- |
| last change | Implement missing DP instructions Add UNIMP() on all non-DP instructions in the DP block |
| view | annotate | diff | log | raw |
1 /**
2 * $Id: armmem.c,v 1.6 2005-12-26 10:48:20 nkeynes Exp $
3 *
4 * Implements the ARM's memory map.
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 <stdlib.h>
20 #include "dream.h"
21 #include "mem.h"
23 char *arm_mem = NULL;
24 char *arm_mem_scratch = NULL;
26 void arm_mem_init() {
27 arm_mem = mem_get_region_by_name( MEM_REGION_AUDIO );
28 arm_mem_scratch = mem_get_region_by_name( MEM_REGION_AUDIO_SCRATCH );
29 }
31 int arm_has_page( uint32_t addr ) {
32 return ( addr < 0x00200000 ||
33 (addr >= 0x00800000 && addr <= 0x00805000 ) );
34 }
36 uint32_t arm_read_long( uint32_t addr ) {
37 if( addr < 0x00200000 ) {
38 return *(int32_t *)(arm_mem + addr);
39 /* Main sound ram */
40 } else {
41 switch( addr & 0xFFFFF000 ) {
42 case 0x00800000:
43 return mmio_region_AICA0_read(addr);
44 case 0x00801000:
45 return mmio_region_AICA1_read(addr);
46 case 0x00802000:
47 return mmio_region_AICA2_read(addr);
48 case 0x00803000:
49 case 0x00804000:
50 return *(int32_t *)(arm_mem_scratch + addr - 0x00803000);
51 }
52 }
53 ERROR( "Attempted long read to undefined page: %08X",
54 addr );
55 /* Undefined memory */
56 return 0;
57 }
59 uint32_t arm_read_word( uint32_t addr ) {
60 return (uint32_t)(uint16_t)arm_read_long( addr );
61 }
63 uint32_t arm_read_byte( uint32_t addr ) {
64 return (uint32_t)(uint8_t)arm_read_long( addr );
65 }
67 void arm_write_long( uint32_t addr, uint32_t value )
68 {
69 if( addr < 0x00200000 ) {
70 /* Main sound ram */
71 *(uint32_t *)(arm_mem + addr) = value;
72 } else {
73 switch( addr & 0xFFFFF000 ) {
74 case 0x00800000:
75 mmio_region_AICA0_write(addr, value);
76 break;
77 case 0x00801000:
78 mmio_region_AICA1_write(addr, value);
79 break;
80 case 0x00802000:
81 mmio_region_AICA2_write(addr, value);
82 break;
83 case 0x00803000:
84 case 0x00804000:
85 *(uint32_t *)(arm_mem_scratch + addr - 0x00803000) = value;
86 break;
87 default:
88 ERROR( "Attempted long write to undefined address: %08X",
89 addr );
90 /* Undefined memory */
91 }
92 }
93 return 0;
94 }
96 void arm_write_byte( uint32_t addr, uint32_t value )
97 {
98 if( addr < 0x00200000 ) {
99 /* Main sound ram */
100 *(uint8_t *)(arm_mem + addr) = (uint8_t)value;
101 } else {
102 switch( addr & 0xFFFFF000 ) {
103 case 0x00800000:
104 mmio_region_AICA0_write(addr, value);
105 break;
106 case 0x00801000:
107 mmio_region_AICA1_write(addr, value);
108 break;
109 case 0x00802000:
110 mmio_region_AICA2_write(addr, value);
111 break;
112 case 0x00803000:
113 case 0x00804000:
114 *(uint8_t *)(arm_mem_scratch + addr - 0x00803000) = (uint8_t)value;
115 break;
116 default:
117 ERROR( "Attempted byte write to undefined address: %08X",
118 addr );
119 /* Undefined memory */
120 }
121 }
122 return 0;
123 }
125 /* User translations - TODO */
127 uint32_t arm_read_long_user( uint32_t addr ) {
128 return arm_read_long( addr );
129 }
131 uint32_t arm_read_byte_user( uint32_t addr ) {
132 return arm_read_byte( addr );
133 }
135 void arm_write_long_user( uint32_t addr, uint32_t val ) {
136 arm_write_long( addr, val );
137 }
139 void arm_write_byte_user( uint32_t addr, uint32_t val )
140 {
141 arm_write_byte( addr, val );
142 }
.