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b92e5a22 FB |
1 | /* |
2 | * Software MMU support | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | #define DATA_SIZE (1 << SHIFT) | |
21 | ||
22 | #if DATA_SIZE == 8 | |
23 | #define SUFFIX q | |
61382a50 | 24 | #define USUFFIX q |
b92e5a22 FB |
25 | #define DATA_TYPE uint64_t |
26 | #elif DATA_SIZE == 4 | |
27 | #define SUFFIX l | |
61382a50 | 28 | #define USUFFIX l |
b92e5a22 FB |
29 | #define DATA_TYPE uint32_t |
30 | #elif DATA_SIZE == 2 | |
31 | #define SUFFIX w | |
61382a50 | 32 | #define USUFFIX uw |
b92e5a22 FB |
33 | #define DATA_TYPE uint16_t |
34 | #elif DATA_SIZE == 1 | |
35 | #define SUFFIX b | |
61382a50 | 36 | #define USUFFIX ub |
b92e5a22 FB |
37 | #define DATA_TYPE uint8_t |
38 | #else | |
39 | #error unsupported data size | |
40 | #endif | |
41 | ||
61382a50 FB |
42 | static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(unsigned long addr, |
43 | int is_user, | |
44 | void *retaddr); | |
45 | static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(unsigned long addr, | |
46 | DATA_TYPE val, | |
47 | int is_user, | |
48 | void *retaddr); | |
b92e5a22 FB |
49 | |
50 | static inline DATA_TYPE glue(io_read, SUFFIX)(unsigned long physaddr, | |
51 | unsigned long tlb_addr) | |
52 | { | |
53 | DATA_TYPE res; | |
54 | int index; | |
55 | ||
56 | index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1); | |
57 | #if SHIFT <= 2 | |
58 | res = io_mem_read[index][SHIFT](physaddr); | |
59 | #else | |
60 | #ifdef TARGET_WORDS_BIGENDIAN | |
61 | res = (uint64_t)io_mem_read[index][2](physaddr) << 32; | |
62 | res |= io_mem_read[index][2](physaddr + 4); | |
63 | #else | |
64 | res = io_mem_read[index][2](physaddr); | |
65 | res |= (uint64_t)io_mem_read[index][2](physaddr + 4) << 32; | |
66 | #endif | |
67 | #endif /* SHIFT > 2 */ | |
68 | return res; | |
69 | } | |
70 | ||
71 | static inline void glue(io_write, SUFFIX)(unsigned long physaddr, | |
72 | DATA_TYPE val, | |
73 | unsigned long tlb_addr) | |
74 | { | |
75 | int index; | |
76 | ||
77 | index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1); | |
78 | #if SHIFT <= 2 | |
79 | io_mem_write[index][SHIFT](physaddr, val); | |
80 | #else | |
81 | #ifdef TARGET_WORDS_BIGENDIAN | |
82 | io_mem_write[index][2](physaddr, val >> 32); | |
83 | io_mem_write[index][2](physaddr + 4, val); | |
84 | #else | |
85 | io_mem_write[index][2](physaddr, val); | |
86 | io_mem_write[index][2](physaddr + 4, val >> 32); | |
87 | #endif | |
88 | #endif /* SHIFT > 2 */ | |
89 | } | |
90 | ||
91 | /* handle all cases except unaligned access which span two pages */ | |
61382a50 FB |
92 | DATA_TYPE REGPARM(1) glue(glue(__ld, SUFFIX), MMUSUFFIX)(unsigned long addr, |
93 | int is_user) | |
b92e5a22 FB |
94 | { |
95 | DATA_TYPE res; | |
61382a50 | 96 | int index; |
b92e5a22 FB |
97 | unsigned long physaddr, tlb_addr; |
98 | void *retaddr; | |
99 | ||
100 | /* test if there is match for unaligned or IO access */ | |
101 | /* XXX: could done more in memory macro in a non portable way */ | |
b92e5a22 FB |
102 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
103 | redo: | |
104 | tlb_addr = env->tlb_read[is_user][index].address; | |
105 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { | |
106 | physaddr = addr + env->tlb_read[is_user][index].addend; | |
107 | if (tlb_addr & ~TARGET_PAGE_MASK) { | |
108 | /* IO access */ | |
109 | if ((addr & (DATA_SIZE - 1)) != 0) | |
110 | goto do_unaligned_access; | |
111 | res = glue(io_read, SUFFIX)(physaddr, tlb_addr); | |
112 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { | |
113 | /* slow unaligned access (it spans two pages or IO) */ | |
114 | do_unaligned_access: | |
61382a50 FB |
115 | retaddr = GETPC(); |
116 | res = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr, | |
117 | is_user, retaddr); | |
b92e5a22 FB |
118 | } else { |
119 | /* unaligned access in the same page */ | |
61382a50 | 120 | res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr); |
b92e5a22 FB |
121 | } |
122 | } else { | |
123 | /* the page is not in the TLB : fill it */ | |
61382a50 FB |
124 | retaddr = GETPC(); |
125 | tlb_fill(addr, 0, is_user, retaddr); | |
b92e5a22 FB |
126 | goto redo; |
127 | } | |
128 | return res; | |
129 | } | |
130 | ||
131 | /* handle all unaligned cases */ | |
61382a50 FB |
132 | static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(unsigned long addr, |
133 | int is_user, | |
134 | void *retaddr) | |
b92e5a22 FB |
135 | { |
136 | DATA_TYPE res, res1, res2; | |
61382a50 | 137 | int index, shift; |
b92e5a22 FB |
138 | unsigned long physaddr, tlb_addr, addr1, addr2; |
139 | ||
b92e5a22 FB |
140 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
141 | redo: | |
142 | tlb_addr = env->tlb_read[is_user][index].address; | |
143 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { | |
144 | physaddr = addr + env->tlb_read[is_user][index].addend; | |
145 | if (tlb_addr & ~TARGET_PAGE_MASK) { | |
146 | /* IO access */ | |
147 | if ((addr & (DATA_SIZE - 1)) != 0) | |
148 | goto do_unaligned_access; | |
149 | res = glue(io_read, SUFFIX)(physaddr, tlb_addr); | |
150 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { | |
151 | do_unaligned_access: | |
152 | /* slow unaligned access (it spans two pages) */ | |
153 | addr1 = addr & ~(DATA_SIZE - 1); | |
154 | addr2 = addr1 + DATA_SIZE; | |
61382a50 FB |
155 | res1 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr1, |
156 | is_user, retaddr); | |
157 | res2 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr2, | |
158 | is_user, retaddr); | |
b92e5a22 FB |
159 | shift = (addr & (DATA_SIZE - 1)) * 8; |
160 | #ifdef TARGET_WORDS_BIGENDIAN | |
161 | res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift)); | |
162 | #else | |
163 | res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift)); | |
164 | #endif | |
165 | } else { | |
166 | /* unaligned/aligned access in the same page */ | |
61382a50 | 167 | res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr); |
b92e5a22 FB |
168 | } |
169 | } else { | |
170 | /* the page is not in the TLB : fill it */ | |
61382a50 | 171 | tlb_fill(addr, 0, is_user, retaddr); |
b92e5a22 FB |
172 | goto redo; |
173 | } | |
174 | return res; | |
175 | } | |
176 | ||
177 | ||
61382a50 FB |
178 | void REGPARM(2) glue(glue(__st, SUFFIX), MMUSUFFIX)(unsigned long addr, |
179 | DATA_TYPE val, | |
180 | int is_user) | |
b92e5a22 FB |
181 | { |
182 | unsigned long physaddr, tlb_addr; | |
183 | void *retaddr; | |
61382a50 | 184 | int index; |
b92e5a22 | 185 | |
b92e5a22 FB |
186 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
187 | redo: | |
188 | tlb_addr = env->tlb_write[is_user][index].address; | |
189 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { | |
4ad06a29 | 190 | physaddr = addr + env->tlb_write[is_user][index].addend; |
b92e5a22 FB |
191 | if (tlb_addr & ~TARGET_PAGE_MASK) { |
192 | /* IO access */ | |
193 | if ((addr & (DATA_SIZE - 1)) != 0) | |
194 | goto do_unaligned_access; | |
195 | glue(io_write, SUFFIX)(physaddr, val, tlb_addr); | |
196 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { | |
197 | do_unaligned_access: | |
61382a50 FB |
198 | retaddr = GETPC(); |
199 | glue(glue(slow_st, SUFFIX), MMUSUFFIX)(addr, val, | |
200 | is_user, retaddr); | |
b92e5a22 FB |
201 | } else { |
202 | /* aligned/unaligned access in the same page */ | |
203 | glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val); | |
204 | } | |
205 | } else { | |
206 | /* the page is not in the TLB : fill it */ | |
61382a50 FB |
207 | retaddr = GETPC(); |
208 | tlb_fill(addr, 1, is_user, retaddr); | |
b92e5a22 FB |
209 | goto redo; |
210 | } | |
211 | } | |
212 | ||
213 | /* handles all unaligned cases */ | |
61382a50 FB |
214 | static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(unsigned long addr, |
215 | DATA_TYPE val, | |
216 | int is_user, | |
217 | void *retaddr) | |
b92e5a22 FB |
218 | { |
219 | unsigned long physaddr, tlb_addr; | |
61382a50 | 220 | int index, i; |
b92e5a22 | 221 | |
b92e5a22 FB |
222 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
223 | redo: | |
224 | tlb_addr = env->tlb_write[is_user][index].address; | |
225 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { | |
4ad06a29 | 226 | physaddr = addr + env->tlb_write[is_user][index].addend; |
b92e5a22 FB |
227 | if (tlb_addr & ~TARGET_PAGE_MASK) { |
228 | /* IO access */ | |
229 | if ((addr & (DATA_SIZE - 1)) != 0) | |
230 | goto do_unaligned_access; | |
231 | glue(io_write, SUFFIX)(physaddr, val, tlb_addr); | |
232 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { | |
233 | do_unaligned_access: | |
234 | /* XXX: not efficient, but simple */ | |
235 | for(i = 0;i < DATA_SIZE; i++) { | |
236 | #ifdef TARGET_WORDS_BIGENDIAN | |
61382a50 FB |
237 | glue(slow_stb, MMUSUFFIX)(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)), |
238 | is_user, retaddr); | |
b92e5a22 | 239 | #else |
61382a50 FB |
240 | glue(slow_stb, MMUSUFFIX)(addr + i, val >> (i * 8), |
241 | is_user, retaddr); | |
b92e5a22 FB |
242 | #endif |
243 | } | |
244 | } else { | |
245 | /* aligned/unaligned access in the same page */ | |
246 | glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val); | |
247 | } | |
248 | } else { | |
249 | /* the page is not in the TLB : fill it */ | |
61382a50 | 250 | tlb_fill(addr, 1, is_user, retaddr); |
b92e5a22 FB |
251 | goto redo; |
252 | } | |
253 | } | |
254 | ||
255 | #undef SHIFT | |
256 | #undef DATA_TYPE | |
257 | #undef SUFFIX | |
61382a50 | 258 | #undef USUFFIX |
b92e5a22 | 259 | #undef DATA_SIZE |