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bbe88886 CM |
1 | /* |
2 | * linux/arch/arm/mm/proc-v7.S | |
3 | * | |
4 | * Copyright (C) 2001 Deep Blue Solutions Ltd. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This is the "shell" of the ARMv7 processor support. | |
11 | */ | |
991da17e | 12 | #include <linux/init.h> |
bbe88886 CM |
13 | #include <linux/linkage.h> |
14 | #include <asm/assembler.h> | |
15 | #include <asm/asm-offsets.h> | |
5ec9407d | 16 | #include <asm/hwcap.h> |
bbe88886 CM |
17 | #include <asm/pgtable-hwdef.h> |
18 | #include <asm/pgtable.h> | |
19 | ||
20 | #include "proc-macros.S" | |
21 | ||
bbe88886 | 22 | #define TTB_S (1 << 1) |
73b63efa JC |
23 | #define TTB_RGN_NC (0 << 3) |
24 | #define TTB_RGN_OC_WBWA (1 << 3) | |
bbe88886 CM |
25 | #define TTB_RGN_OC_WT (2 << 3) |
26 | #define TTB_RGN_OC_WB (3 << 3) | |
ba3c0263 TT |
27 | #define TTB_NOS (1 << 5) |
28 | #define TTB_IRGN_NC ((0 << 0) | (0 << 6)) | |
29 | #define TTB_IRGN_WBWA ((0 << 0) | (1 << 6)) | |
30 | #define TTB_IRGN_WT ((1 << 0) | (0 << 6)) | |
31 | #define TTB_IRGN_WB ((1 << 0) | (1 << 6)) | |
bbe88886 | 32 | |
73b63efa | 33 | #ifndef CONFIG_SMP |
ba3c0263 TT |
34 | /* PTWs cacheable, inner WB not shareable, outer WB not shareable */ |
35 | #define TTB_FLAGS TTB_IRGN_WB|TTB_RGN_OC_WB | |
4b46d641 | 36 | #define PMD_FLAGS PMD_SECT_WB |
73b63efa | 37 | #else |
ba3c0263 TT |
38 | /* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */ |
39 | #define TTB_FLAGS TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA | |
4b46d641 | 40 | #define PMD_FLAGS PMD_SECT_WBWA|PMD_SECT_S |
73b63efa JC |
41 | #endif |
42 | ||
bbe88886 CM |
43 | ENTRY(cpu_v7_proc_init) |
44 | mov pc, lr | |
93ed3970 | 45 | ENDPROC(cpu_v7_proc_init) |
bbe88886 CM |
46 | |
47 | ENTRY(cpu_v7_proc_fin) | |
48 | mov pc, lr | |
93ed3970 | 49 | ENDPROC(cpu_v7_proc_fin) |
bbe88886 CM |
50 | |
51 | /* | |
52 | * cpu_v7_reset(loc) | |
53 | * | |
54 | * Perform a soft reset of the system. Put the CPU into the | |
55 | * same state as it would be if it had been reset, and branch | |
56 | * to what would be the reset vector. | |
57 | * | |
58 | * - loc - location to jump to for soft reset | |
59 | * | |
60 | * It is assumed that: | |
61 | */ | |
62 | .align 5 | |
63 | ENTRY(cpu_v7_reset) | |
64 | mov pc, r0 | |
93ed3970 | 65 | ENDPROC(cpu_v7_reset) |
bbe88886 CM |
66 | |
67 | /* | |
68 | * cpu_v7_do_idle() | |
69 | * | |
70 | * Idle the processor (eg, wait for interrupt). | |
71 | * | |
72 | * IRQs are already disabled. | |
73 | */ | |
74 | ENTRY(cpu_v7_do_idle) | |
8553cb67 | 75 | dsb @ WFI may enter a low-power mode |
000b5025 | 76 | wfi |
bbe88886 | 77 | mov pc, lr |
93ed3970 | 78 | ENDPROC(cpu_v7_do_idle) |
bbe88886 CM |
79 | |
80 | ENTRY(cpu_v7_dcache_clean_area) | |
81 | #ifndef TLB_CAN_READ_FROM_L1_CACHE | |
82 | dcache_line_size r2, r3 | |
83 | 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry | |
84 | add r0, r0, r2 | |
85 | subs r1, r1, r2 | |
86 | bhi 1b | |
87 | dsb | |
88 | #endif | |
89 | mov pc, lr | |
93ed3970 | 90 | ENDPROC(cpu_v7_dcache_clean_area) |
bbe88886 CM |
91 | |
92 | /* | |
93 | * cpu_v7_switch_mm(pgd_phys, tsk) | |
94 | * | |
95 | * Set the translation table base pointer to be pgd_phys | |
96 | * | |
97 | * - pgd_phys - physical address of new TTB | |
98 | * | |
99 | * It is assumed that: | |
100 | * - we are not using split page tables | |
101 | */ | |
102 | ENTRY(cpu_v7_switch_mm) | |
2eb8c82b | 103 | #ifdef CONFIG_MMU |
bbe88886 CM |
104 | mov r2, #0 |
105 | ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id | |
73b63efa | 106 | orr r0, r0, #TTB_FLAGS |
7ce236fc CM |
107 | #ifdef CONFIG_ARM_ERRATA_430973 |
108 | mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB | |
109 | #endif | |
bbe88886 CM |
110 | mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID |
111 | isb | |
112 | 1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 | |
113 | isb | |
114 | mcr p15, 0, r1, c13, c0, 1 @ set context ID | |
115 | isb | |
2eb8c82b | 116 | #endif |
bbe88886 | 117 | mov pc, lr |
93ed3970 | 118 | ENDPROC(cpu_v7_switch_mm) |
bbe88886 CM |
119 | |
120 | /* | |
121 | * cpu_v7_set_pte_ext(ptep, pte) | |
122 | * | |
123 | * Set a level 2 translation table entry. | |
124 | * | |
125 | * - ptep - pointer to level 2 translation table entry | |
126 | * (hardware version is stored at -1024 bytes) | |
127 | * - pte - PTE value to store | |
128 | * - ext - value for extended PTE bits | |
bbe88886 CM |
129 | */ |
130 | ENTRY(cpu_v7_set_pte_ext) | |
2eb8c82b | 131 | #ifdef CONFIG_MMU |
347c8b70 CM |
132 | ARM( str r1, [r0], #-2048 ) @ linux version |
133 | THUMB( str r1, [r0] ) @ linux version | |
134 | THUMB( sub r0, r0, #2048 ) | |
bbe88886 CM |
135 | |
136 | bic r3, r1, #0x000003f0 | |
3f69c0c1 | 137 | bic r3, r3, #PTE_TYPE_MASK |
bbe88886 CM |
138 | orr r3, r3, r2 |
139 | orr r3, r3, #PTE_EXT_AP0 | 2 | |
140 | ||
b1cce6b1 | 141 | tst r1, #1 << 4 |
3f69c0c1 RK |
142 | orrne r3, r3, #PTE_EXT_TEX(1) |
143 | ||
bbe88886 CM |
144 | tst r1, #L_PTE_WRITE |
145 | tstne r1, #L_PTE_DIRTY | |
146 | orreq r3, r3, #PTE_EXT_APX | |
147 | ||
148 | tst r1, #L_PTE_USER | |
149 | orrne r3, r3, #PTE_EXT_AP1 | |
150 | tstne r3, #PTE_EXT_APX | |
151 | bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0 | |
152 | ||
bbe88886 CM |
153 | tst r1, #L_PTE_EXEC |
154 | orreq r3, r3, #PTE_EXT_XN | |
155 | ||
3f69c0c1 RK |
156 | tst r1, #L_PTE_YOUNG |
157 | tstne r1, #L_PTE_PRESENT | |
bbe88886 CM |
158 | moveq r3, #0 |
159 | ||
160 | str r3, [r0] | |
161 | mcr p15, 0, r0, c7, c10, 1 @ flush_pte | |
2eb8c82b | 162 | #endif |
bbe88886 | 163 | mov pc, lr |
93ed3970 | 164 | ENDPROC(cpu_v7_set_pte_ext) |
bbe88886 CM |
165 | |
166 | cpu_v7_name: | |
167 | .ascii "ARMv7 Processor" | |
168 | .align | |
169 | ||
991da17e | 170 | __INIT |
bbe88886 CM |
171 | |
172 | /* | |
173 | * __v7_setup | |
174 | * | |
175 | * Initialise TLB, Caches, and MMU state ready to switch the MMU | |
176 | * on. Return in r0 the new CP15 C1 control register setting. | |
177 | * | |
178 | * We automatically detect if we have a Harvard cache, and use the | |
179 | * Harvard cache control instructions insead of the unified cache | |
180 | * control instructions. | |
181 | * | |
182 | * This should be able to cover all ARMv7 cores. | |
183 | * | |
184 | * It is assumed that: | |
185 | * - cache type register is implemented | |
186 | */ | |
187 | __v7_setup: | |
73b63efa | 188 | #ifdef CONFIG_SMP |
1b3a02eb TT |
189 | mrc p15, 0, r0, c1, c0, 1 |
190 | tst r0, #(1 << 6) @ SMP/nAMP mode enabled? | |
191 | orreq r0, r0, #(1 << 6) | (1 << 0) @ Enable SMP/nAMP mode and | |
192 | mcreq p15, 0, r0, c1, c0, 1 @ TLB ops broadcasting | |
73b63efa | 193 | #endif |
bbe88886 CM |
194 | adr r12, __v7_setup_stack @ the local stack |
195 | stmia r12, {r0-r5, r7, r9, r11, lr} | |
196 | bl v7_flush_dcache_all | |
197 | ldmia r12, {r0-r5, r7, r9, r11, lr} | |
1946d6ef RK |
198 | |
199 | mrc p15, 0, r0, c0, c0, 0 @ read main ID register | |
200 | and r10, r0, #0xff000000 @ ARM? | |
201 | teq r10, #0x41000000 | |
202 | bne 2f | |
203 | and r5, r0, #0x00f00000 @ variant | |
204 | and r6, r0, #0x0000000f @ revision | |
205 | orr r0, r6, r5, lsr #20-4 @ combine variant and revision | |
206 | ||
7ce236fc | 207 | #ifdef CONFIG_ARM_ERRATA_430973 |
1946d6ef RK |
208 | teq r5, #0x00100000 @ only present in r1p* |
209 | mrceq p15, 0, r10, c1, c0, 1 @ read aux control register | |
210 | orreq r10, r10, #(1 << 6) @ set IBE to 1 | |
211 | mcreq p15, 0, r10, c1, c0, 1 @ write aux control register | |
855c551f CM |
212 | #endif |
213 | #ifdef CONFIG_ARM_ERRATA_458693 | |
1946d6ef RK |
214 | teq r0, #0x20 @ only present in r2p0 |
215 | mrceq p15, 0, r10, c1, c0, 1 @ read aux control register | |
216 | orreq r10, r10, #(1 << 5) @ set L1NEON to 1 | |
217 | orreq r10, r10, #(1 << 9) @ set PLDNOP to 1 | |
218 | mcreq p15, 0, r10, c1, c0, 1 @ write aux control register | |
0516e464 CM |
219 | #endif |
220 | #ifdef CONFIG_ARM_ERRATA_460075 | |
1946d6ef RK |
221 | teq r0, #0x20 @ only present in r2p0 |
222 | mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register | |
223 | tsteq r10, #1 << 22 | |
224 | orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit | |
225 | mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register | |
7ce236fc | 226 | #endif |
1946d6ef RK |
227 | |
228 | 2: mov r10, #0 | |
bbe88886 CM |
229 | #ifdef HARVARD_CACHE |
230 | mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate | |
231 | #endif | |
232 | dsb | |
2eb8c82b | 233 | #ifdef CONFIG_MMU |
bbe88886 CM |
234 | mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs |
235 | mcr p15, 0, r10, c2, c0, 2 @ TTB control register | |
73b63efa | 236 | orr r4, r4, #TTB_FLAGS |
bbe88886 CM |
237 | mcr p15, 0, r4, c2, c0, 1 @ load TTB1 |
238 | mov r10, #0x1f @ domains 0, 1 = manager | |
239 | mcr p15, 0, r10, c3, c0, 0 @ load domain access register | |
23d1c515 CM |
240 | /* |
241 | * Memory region attributes with SCTLR.TRE=1 | |
242 | * | |
243 | * n = TEX[0],C,B | |
244 | * TR = PRRR[2n+1:2n] - memory type | |
245 | * IR = NMRR[2n+1:2n] - inner cacheable property | |
246 | * OR = NMRR[2n+17:2n+16] - outer cacheable property | |
247 | * | |
248 | * n TR IR OR | |
249 | * UNCACHED 000 00 | |
250 | * BUFFERABLE 001 10 00 00 | |
251 | * WRITETHROUGH 010 10 10 10 | |
252 | * WRITEBACK 011 10 11 11 | |
253 | * reserved 110 | |
254 | * WRITEALLOC 111 10 01 01 | |
255 | * DEV_SHARED 100 01 | |
256 | * DEV_NONSHARED 100 01 | |
257 | * DEV_WC 001 10 | |
258 | * DEV_CACHED 011 10 | |
259 | * | |
260 | * Other attributes: | |
261 | * | |
262 | * DS0 = PRRR[16] = 0 - device shareable property | |
263 | * DS1 = PRRR[17] = 1 - device shareable property | |
264 | * NS0 = PRRR[18] = 0 - normal shareable property | |
265 | * NS1 = PRRR[19] = 1 - normal shareable property | |
266 | * NOS = PRRR[24+n] = 1 - not outer shareable | |
267 | */ | |
268 | ldr r5, =0xff0a81a8 @ PRRR | |
269 | ldr r6, =0x40e040e0 @ NMRR | |
3f69c0c1 RK |
270 | mcr p15, 0, r5, c10, c2, 0 @ write PRRR |
271 | mcr p15, 0, r6, c10, c2, 1 @ write NMRR | |
bdaaaec3 | 272 | #endif |
2eb8c82b CM |
273 | adr r5, v7_crval |
274 | ldmia r5, {r5, r6} | |
26584853 CM |
275 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
276 | orr r6, r6, #1 << 25 @ big-endian page tables | |
277 | #endif | |
2eb8c82b CM |
278 | mrc p15, 0, r0, c1, c0, 0 @ read control register |
279 | bic r0, r0, r5 @ clear bits them | |
280 | orr r0, r0, r6 @ set them | |
347c8b70 | 281 | THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions |
bbe88886 | 282 | mov pc, lr @ return to head.S:__ret |
93ed3970 | 283 | ENDPROC(__v7_setup) |
bbe88886 | 284 | |
b1cce6b1 | 285 | /* AT |
213fb2a8 CM |
286 | * TFR EV X F I D LR S |
287 | * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM | |
b1cce6b1 | 288 | * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced |
213fb2a8 | 289 | * 1 0 110 0011 1100 .111 1101 < we want |
bbe88886 | 290 | */ |
2eb8c82b CM |
291 | .type v7_crval, #object |
292 | v7_crval: | |
213fb2a8 | 293 | crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c |
bbe88886 CM |
294 | |
295 | __v7_setup_stack: | |
296 | .space 4 * 11 @ 11 registers | |
297 | ||
298 | .type v7_processor_functions, #object | |
299 | ENTRY(v7_processor_functions) | |
300 | .word v7_early_abort | |
4fb28474 | 301 | .word v7_pabort |
bbe88886 CM |
302 | .word cpu_v7_proc_init |
303 | .word cpu_v7_proc_fin | |
304 | .word cpu_v7_reset | |
305 | .word cpu_v7_do_idle | |
306 | .word cpu_v7_dcache_clean_area | |
307 | .word cpu_v7_switch_mm | |
308 | .word cpu_v7_set_pte_ext | |
309 | .size v7_processor_functions, . - v7_processor_functions | |
310 | ||
311 | .type cpu_arch_name, #object | |
312 | cpu_arch_name: | |
313 | .asciz "armv7" | |
314 | .size cpu_arch_name, . - cpu_arch_name | |
315 | ||
316 | .type cpu_elf_name, #object | |
317 | cpu_elf_name: | |
318 | .asciz "v7" | |
319 | .size cpu_elf_name, . - cpu_elf_name | |
320 | .align | |
321 | ||
322 | .section ".proc.info.init", #alloc, #execinstr | |
323 | ||
324 | /* | |
325 | * Match any ARMv7 processor core. | |
326 | */ | |
327 | .type __v7_proc_info, #object | |
328 | __v7_proc_info: | |
329 | .long 0x000f0000 @ Required ID value | |
330 | .long 0x000f0000 @ Mask for ID | |
331 | .long PMD_TYPE_SECT | \ | |
bbe88886 | 332 | PMD_SECT_AP_WRITE | \ |
4b46d641 RK |
333 | PMD_SECT_AP_READ | \ |
334 | PMD_FLAGS | |
bbe88886 CM |
335 | .long PMD_TYPE_SECT | \ |
336 | PMD_SECT_XN | \ | |
337 | PMD_SECT_AP_WRITE | \ | |
338 | PMD_SECT_AP_READ | |
339 | b __v7_setup | |
340 | .long cpu_arch_name | |
341 | .long cpu_elf_name | |
342 | .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP | |
343 | .long cpu_v7_name | |
344 | .long v7_processor_functions | |
2ccdd1e7 | 345 | .long v7wbi_tlb_fns |
bbe88886 CM |
346 | .long v6_user_fns |
347 | .long v7_cache_fns | |
348 | .size __v7_proc_info, . - __v7_proc_info |