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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 | |
24 | #define DATA_TYPE uint64_t | |
25 | #elif DATA_SIZE == 4 | |
26 | #define SUFFIX l | |
27 | #define DATA_TYPE uint32_t | |
28 | #elif DATA_SIZE == 2 | |
29 | #define SUFFIX w | |
30 | #define DATA_TYPE uint16_t | |
31 | #elif DATA_SIZE == 1 | |
32 | #define SUFFIX b | |
33 | #define DATA_TYPE uint8_t | |
34 | #else | |
35 | #error unsupported data size | |
36 | #endif | |
37 | ||
38 | static DATA_TYPE glue(slow_ld, SUFFIX)(unsigned long addr, void *retaddr); | |
39 | static void glue(slow_st, SUFFIX)(unsigned long addr, DATA_TYPE val, | |
40 | void *retaddr); | |
41 | ||
42 | static inline DATA_TYPE glue(io_read, SUFFIX)(unsigned long physaddr, | |
43 | unsigned long tlb_addr) | |
44 | { | |
45 | DATA_TYPE res; | |
46 | int index; | |
47 | ||
48 | index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1); | |
49 | #if SHIFT <= 2 | |
50 | res = io_mem_read[index][SHIFT](physaddr); | |
51 | #else | |
52 | #ifdef TARGET_WORDS_BIGENDIAN | |
53 | res = (uint64_t)io_mem_read[index][2](physaddr) << 32; | |
54 | res |= io_mem_read[index][2](physaddr + 4); | |
55 | #else | |
56 | res = io_mem_read[index][2](physaddr); | |
57 | res |= (uint64_t)io_mem_read[index][2](physaddr + 4) << 32; | |
58 | #endif | |
59 | #endif /* SHIFT > 2 */ | |
60 | return res; | |
61 | } | |
62 | ||
63 | static inline void glue(io_write, SUFFIX)(unsigned long physaddr, | |
64 | DATA_TYPE val, | |
65 | unsigned long tlb_addr) | |
66 | { | |
67 | int index; | |
68 | ||
69 | index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1); | |
70 | #if SHIFT <= 2 | |
71 | io_mem_write[index][SHIFT](physaddr, val); | |
72 | #else | |
73 | #ifdef TARGET_WORDS_BIGENDIAN | |
74 | io_mem_write[index][2](physaddr, val >> 32); | |
75 | io_mem_write[index][2](physaddr + 4, val); | |
76 | #else | |
77 | io_mem_write[index][2](physaddr, val); | |
78 | io_mem_write[index][2](physaddr + 4, val >> 32); | |
79 | #endif | |
80 | #endif /* SHIFT > 2 */ | |
81 | } | |
82 | ||
83 | /* handle all cases except unaligned access which span two pages */ | |
84 | DATA_TYPE __attribute((regparm(1))) glue(glue(__ld, SUFFIX), _mmu)(unsigned long addr) | |
85 | { | |
86 | DATA_TYPE res; | |
87 | int is_user, index; | |
88 | unsigned long physaddr, tlb_addr; | |
89 | void *retaddr; | |
90 | ||
91 | /* test if there is match for unaligned or IO access */ | |
92 | /* XXX: could done more in memory macro in a non portable way */ | |
93 | is_user = (env->cpl == 3); | |
94 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); | |
95 | redo: | |
96 | tlb_addr = env->tlb_read[is_user][index].address; | |
97 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { | |
98 | physaddr = addr + env->tlb_read[is_user][index].addend; | |
99 | if (tlb_addr & ~TARGET_PAGE_MASK) { | |
100 | /* IO access */ | |
101 | if ((addr & (DATA_SIZE - 1)) != 0) | |
102 | goto do_unaligned_access; | |
103 | res = glue(io_read, SUFFIX)(physaddr, tlb_addr); | |
104 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { | |
105 | /* slow unaligned access (it spans two pages or IO) */ | |
106 | do_unaligned_access: | |
107 | retaddr = __builtin_return_address(0); | |
108 | res = glue(slow_ld, SUFFIX)(addr, retaddr); | |
109 | } else { | |
110 | /* unaligned access in the same page */ | |
111 | res = glue(glue(ldu, SUFFIX), _raw)((uint8_t *)physaddr); | |
112 | } | |
113 | } else { | |
114 | /* the page is not in the TLB : fill it */ | |
115 | retaddr = __builtin_return_address(0); | |
116 | tlb_fill(addr, 0, retaddr); | |
117 | goto redo; | |
118 | } | |
119 | return res; | |
120 | } | |
121 | ||
122 | /* handle all unaligned cases */ | |
123 | static DATA_TYPE glue(slow_ld, SUFFIX)(unsigned long addr, void *retaddr) | |
124 | { | |
125 | DATA_TYPE res, res1, res2; | |
126 | int is_user, index, shift; | |
127 | unsigned long physaddr, tlb_addr, addr1, addr2; | |
128 | ||
129 | is_user = (env->cpl == 3); | |
130 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); | |
131 | redo: | |
132 | tlb_addr = env->tlb_read[is_user][index].address; | |
133 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { | |
134 | physaddr = addr + env->tlb_read[is_user][index].addend; | |
135 | if (tlb_addr & ~TARGET_PAGE_MASK) { | |
136 | /* IO access */ | |
137 | if ((addr & (DATA_SIZE - 1)) != 0) | |
138 | goto do_unaligned_access; | |
139 | res = glue(io_read, SUFFIX)(physaddr, tlb_addr); | |
140 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { | |
141 | do_unaligned_access: | |
142 | /* slow unaligned access (it spans two pages) */ | |
143 | addr1 = addr & ~(DATA_SIZE - 1); | |
144 | addr2 = addr1 + DATA_SIZE; | |
145 | res1 = glue(slow_ld, SUFFIX)(addr1, retaddr); | |
146 | res2 = glue(slow_ld, SUFFIX)(addr2, retaddr); | |
147 | shift = (addr & (DATA_SIZE - 1)) * 8; | |
148 | #ifdef TARGET_WORDS_BIGENDIAN | |
149 | res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift)); | |
150 | #else | |
151 | res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift)); | |
152 | #endif | |
153 | } else { | |
154 | /* unaligned/aligned access in the same page */ | |
155 | res = glue(glue(ldu, SUFFIX), _raw)((uint8_t *)physaddr); | |
156 | } | |
157 | } else { | |
158 | /* the page is not in the TLB : fill it */ | |
159 | tlb_fill(addr, 0, retaddr); | |
160 | goto redo; | |
161 | } | |
162 | return res; | |
163 | } | |
164 | ||
165 | ||
166 | void __attribute((regparm(2))) glue(glue(__st, SUFFIX), _mmu)(unsigned long addr, DATA_TYPE val) | |
167 | { | |
168 | unsigned long physaddr, tlb_addr; | |
169 | void *retaddr; | |
170 | int is_user, index; | |
171 | ||
172 | is_user = (env->cpl == 3); | |
173 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); | |
174 | redo: | |
175 | tlb_addr = env->tlb_write[is_user][index].address; | |
176 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { | |
177 | physaddr = addr + env->tlb_read[is_user][index].addend; | |
178 | if (tlb_addr & ~TARGET_PAGE_MASK) { | |
179 | /* IO access */ | |
180 | if ((addr & (DATA_SIZE - 1)) != 0) | |
181 | goto do_unaligned_access; | |
182 | glue(io_write, SUFFIX)(physaddr, val, tlb_addr); | |
183 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { | |
184 | do_unaligned_access: | |
185 | retaddr = __builtin_return_address(0); | |
186 | glue(slow_st, SUFFIX)(addr, val, retaddr); | |
187 | } else { | |
188 | /* aligned/unaligned access in the same page */ | |
189 | glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val); | |
190 | } | |
191 | } else { | |
192 | /* the page is not in the TLB : fill it */ | |
193 | retaddr = __builtin_return_address(0); | |
194 | tlb_fill(addr, 1, retaddr); | |
195 | goto redo; | |
196 | } | |
197 | } | |
198 | ||
199 | /* handles all unaligned cases */ | |
200 | static void glue(slow_st, SUFFIX)(unsigned long addr, DATA_TYPE val, | |
201 | void *retaddr) | |
202 | { | |
203 | unsigned long physaddr, tlb_addr; | |
204 | int is_user, index, i; | |
205 | ||
206 | is_user = (env->cpl == 3); | |
207 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); | |
208 | redo: | |
209 | tlb_addr = env->tlb_write[is_user][index].address; | |
210 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { | |
211 | physaddr = addr + env->tlb_read[is_user][index].addend; | |
212 | if (tlb_addr & ~TARGET_PAGE_MASK) { | |
213 | /* IO access */ | |
214 | if ((addr & (DATA_SIZE - 1)) != 0) | |
215 | goto do_unaligned_access; | |
216 | glue(io_write, SUFFIX)(physaddr, val, tlb_addr); | |
217 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { | |
218 | do_unaligned_access: | |
219 | /* XXX: not efficient, but simple */ | |
220 | for(i = 0;i < DATA_SIZE; i++) { | |
221 | #ifdef TARGET_WORDS_BIGENDIAN | |
222 | slow_stb(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)), retaddr); | |
223 | #else | |
224 | slow_stb(addr + i, val >> (i * 8), retaddr); | |
225 | #endif | |
226 | } | |
227 | } else { | |
228 | /* aligned/unaligned access in the same page */ | |
229 | glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val); | |
230 | } | |
231 | } else { | |
232 | /* the page is not in the TLB : fill it */ | |
233 | tlb_fill(addr, 1, retaddr); | |
234 | goto redo; | |
235 | } | |
236 | } | |
237 | ||
238 | #undef SHIFT | |
239 | #undef DATA_TYPE | |
240 | #undef SUFFIX | |
241 | #undef DATA_SIZE |