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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 | |
ba3c0263 | 33 | /* PTWs cacheable, inner WB not shareable, outer WB not shareable */ |
f00ec48f RK |
34 | #define TTB_FLAGS_UP TTB_IRGN_WB|TTB_RGN_OC_WB |
35 | #define PMD_FLAGS_UP PMD_SECT_WB | |
36 | ||
ba3c0263 | 37 | /* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */ |
f00ec48f RK |
38 | #define TTB_FLAGS_SMP TTB_IRGN_WBWA|TTB_S|TTB_NOS|TTB_RGN_OC_WBWA |
39 | #define PMD_FLAGS_SMP PMD_SECT_WBWA|PMD_SECT_S | |
73b63efa | 40 | |
bbe88886 CM |
41 | ENTRY(cpu_v7_proc_init) |
42 | mov pc, lr | |
93ed3970 | 43 | ENDPROC(cpu_v7_proc_init) |
bbe88886 CM |
44 | |
45 | ENTRY(cpu_v7_proc_fin) | |
1f667c69 TL |
46 | mrc p15, 0, r0, c1, c0, 0 @ ctrl register |
47 | bic r0, r0, #0x1000 @ ...i............ | |
48 | bic r0, r0, #0x0006 @ .............ca. | |
49 | mcr p15, 0, r0, c1, c0, 0 @ disable caches | |
9ca03a21 | 50 | mov pc, lr |
93ed3970 | 51 | ENDPROC(cpu_v7_proc_fin) |
bbe88886 CM |
52 | |
53 | /* | |
54 | * cpu_v7_reset(loc) | |
55 | * | |
56 | * Perform a soft reset of the system. Put the CPU into the | |
57 | * same state as it would be if it had been reset, and branch | |
58 | * to what would be the reset vector. | |
59 | * | |
60 | * - loc - location to jump to for soft reset | |
bbe88886 CM |
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 | |
f00ec48f RK |
106 | ALT_SMP(orr r0, r0, #TTB_FLAGS_SMP) |
107 | ALT_UP(orr r0, r0, #TTB_FLAGS_UP) | |
7ce236fc CM |
108 | #ifdef CONFIG_ARM_ERRATA_430973 |
109 | mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB | |
110 | #endif | |
bbe88886 CM |
111 | mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID |
112 | isb | |
113 | 1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 | |
114 | isb | |
115 | mcr p15, 0, r1, c13, c0, 1 @ set context ID | |
116 | isb | |
2eb8c82b | 117 | #endif |
bbe88886 | 118 | mov pc, lr |
93ed3970 | 119 | ENDPROC(cpu_v7_switch_mm) |
bbe88886 CM |
120 | |
121 | /* | |
122 | * cpu_v7_set_pte_ext(ptep, pte) | |
123 | * | |
124 | * Set a level 2 translation table entry. | |
125 | * | |
126 | * - ptep - pointer to level 2 translation table entry | |
d30e45ee | 127 | * (hardware version is stored at +2048 bytes) |
bbe88886 CM |
128 | * - pte - PTE value to store |
129 | * - ext - value for extended PTE bits | |
bbe88886 CM |
130 | */ |
131 | ENTRY(cpu_v7_set_pte_ext) | |
2eb8c82b | 132 | #ifdef CONFIG_MMU |
d30e45ee | 133 | str r1, [r0] @ linux version |
bbe88886 CM |
134 | |
135 | bic r3, r1, #0x000003f0 | |
3f69c0c1 | 136 | bic r3, r3, #PTE_TYPE_MASK |
bbe88886 CM |
137 | orr r3, r3, r2 |
138 | orr r3, r3, #PTE_EXT_AP0 | 2 | |
139 | ||
b1cce6b1 | 140 | tst r1, #1 << 4 |
3f69c0c1 RK |
141 | orrne r3, r3, #PTE_EXT_TEX(1) |
142 | ||
36bb94ba RK |
143 | eor r1, r1, #L_PTE_DIRTY |
144 | tst r1, #L_PTE_RDONLY | L_PTE_DIRTY | |
145 | orrne r3, r3, #PTE_EXT_APX | |
bbe88886 CM |
146 | |
147 | tst r1, #L_PTE_USER | |
148 | orrne r3, r3, #PTE_EXT_AP1 | |
247055aa CM |
149 | #ifdef CONFIG_CPU_USE_DOMAINS |
150 | @ allow kernel read/write access to read-only user pages | |
bbe88886 CM |
151 | tstne r3, #PTE_EXT_APX |
152 | bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0 | |
247055aa | 153 | #endif |
bbe88886 | 154 | |
9522d7e4 RK |
155 | tst r1, #L_PTE_XN |
156 | orrne r3, r3, #PTE_EXT_XN | |
bbe88886 | 157 | |
3f69c0c1 RK |
158 | tst r1, #L_PTE_YOUNG |
159 | tstne r1, #L_PTE_PRESENT | |
bbe88886 CM |
160 | moveq r3, #0 |
161 | ||
874d5d3c DM |
162 | ARM( str r3, [r0, #2048]! ) |
163 | THUMB( add r0, r0, #2048 ) | |
164 | THUMB( str r3, [r0] ) | |
bbe88886 | 165 | mcr p15, 0, r0, c7, c10, 1 @ flush_pte |
2eb8c82b | 166 | #endif |
bbe88886 | 167 | mov pc, lr |
93ed3970 | 168 | ENDPROC(cpu_v7_set_pte_ext) |
bbe88886 CM |
169 | |
170 | cpu_v7_name: | |
171 | .ascii "ARMv7 Processor" | |
172 | .align | |
173 | ||
5085f3ff | 174 | __CPUINIT |
bbe88886 CM |
175 | |
176 | /* | |
177 | * __v7_setup | |
178 | * | |
179 | * Initialise TLB, Caches, and MMU state ready to switch the MMU | |
180 | * on. Return in r0 the new CP15 C1 control register setting. | |
181 | * | |
182 | * We automatically detect if we have a Harvard cache, and use the | |
183 | * Harvard cache control instructions insead of the unified cache | |
184 | * control instructions. | |
185 | * | |
186 | * This should be able to cover all ARMv7 cores. | |
187 | * | |
188 | * It is assumed that: | |
189 | * - cache type register is implemented | |
190 | */ | |
14eff181 | 191 | __v7_ca9mp_setup: |
73b63efa | 192 | #ifdef CONFIG_SMP |
f00ec48f RK |
193 | ALT_SMP(mrc p15, 0, r0, c1, c0, 1) |
194 | ALT_UP(mov r0, #(1 << 6)) @ fake it for UP | |
1b3a02eb TT |
195 | tst r0, #(1 << 6) @ SMP/nAMP mode enabled? |
196 | orreq r0, r0, #(1 << 6) | (1 << 0) @ Enable SMP/nAMP mode and | |
197 | mcreq p15, 0, r0, c1, c0, 1 @ TLB ops broadcasting | |
73b63efa | 198 | #endif |
14eff181 | 199 | __v7_setup: |
bbe88886 CM |
200 | adr r12, __v7_setup_stack @ the local stack |
201 | stmia r12, {r0-r5, r7, r9, r11, lr} | |
202 | bl v7_flush_dcache_all | |
203 | ldmia r12, {r0-r5, r7, r9, r11, lr} | |
1946d6ef RK |
204 | |
205 | mrc p15, 0, r0, c0, c0, 0 @ read main ID register | |
206 | and r10, r0, #0xff000000 @ ARM? | |
207 | teq r10, #0x41000000 | |
9f05027c | 208 | bne 3f |
1946d6ef RK |
209 | and r5, r0, #0x00f00000 @ variant |
210 | and r6, r0, #0x0000000f @ revision | |
6491848d WD |
211 | orr r6, r6, r5, lsr #20-4 @ combine variant and revision |
212 | ubfx r0, r0, #4, #12 @ primary part number | |
1946d6ef | 213 | |
6491848d WD |
214 | /* Cortex-A8 Errata */ |
215 | ldr r10, =0x00000c08 @ Cortex-A8 primary part number | |
216 | teq r0, r10 | |
217 | bne 2f | |
7ce236fc | 218 | #ifdef CONFIG_ARM_ERRATA_430973 |
1946d6ef RK |
219 | teq r5, #0x00100000 @ only present in r1p* |
220 | mrceq p15, 0, r10, c1, c0, 1 @ read aux control register | |
221 | orreq r10, r10, #(1 << 6) @ set IBE to 1 | |
222 | mcreq p15, 0, r10, c1, c0, 1 @ write aux control register | |
855c551f CM |
223 | #endif |
224 | #ifdef CONFIG_ARM_ERRATA_458693 | |
6491848d | 225 | teq r6, #0x20 @ only present in r2p0 |
1946d6ef RK |
226 | mrceq p15, 0, r10, c1, c0, 1 @ read aux control register |
227 | orreq r10, r10, #(1 << 5) @ set L1NEON to 1 | |
228 | orreq r10, r10, #(1 << 9) @ set PLDNOP to 1 | |
229 | mcreq p15, 0, r10, c1, c0, 1 @ write aux control register | |
0516e464 CM |
230 | #endif |
231 | #ifdef CONFIG_ARM_ERRATA_460075 | |
6491848d | 232 | teq r6, #0x20 @ only present in r2p0 |
1946d6ef RK |
233 | mrceq p15, 1, r10, c9, c0, 2 @ read L2 cache aux ctrl register |
234 | tsteq r10, #1 << 22 | |
235 | orreq r10, r10, #(1 << 22) @ set the Write Allocate disable bit | |
236 | mcreq p15, 1, r10, c9, c0, 2 @ write the L2 cache aux ctrl register | |
7ce236fc | 237 | #endif |
9f05027c WD |
238 | b 3f |
239 | ||
240 | /* Cortex-A9 Errata */ | |
241 | 2: ldr r10, =0x00000c09 @ Cortex-A9 primary part number | |
242 | teq r0, r10 | |
243 | bne 3f | |
244 | #ifdef CONFIG_ARM_ERRATA_742230 | |
245 | cmp r6, #0x22 @ only present up to r2p2 | |
246 | mrcle p15, 0, r10, c15, c0, 1 @ read diagnostic register | |
247 | orrle r10, r10, #1 << 4 @ set bit #4 | |
248 | mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register | |
249 | #endif | |
a672e99b WD |
250 | #ifdef CONFIG_ARM_ERRATA_742231 |
251 | teq r6, #0x20 @ present in r2p0 | |
252 | teqne r6, #0x21 @ present in r2p1 | |
253 | teqne r6, #0x22 @ present in r2p2 | |
254 | mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register | |
255 | orreq r10, r10, #1 << 12 @ set bit #12 | |
256 | orreq r10, r10, #1 << 22 @ set bit #22 | |
257 | mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register | |
258 | #endif | |
475d92fc WD |
259 | #ifdef CONFIG_ARM_ERRATA_743622 |
260 | teq r6, #0x20 @ present in r2p0 | |
261 | teqne r6, #0x21 @ present in r2p1 | |
262 | teqne r6, #0x22 @ present in r2p2 | |
263 | mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register | |
264 | orreq r10, r10, #1 << 6 @ set bit #6 | |
265 | mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register | |
266 | #endif | |
1946d6ef | 267 | |
9f05027c | 268 | 3: mov r10, #0 |
bbe88886 CM |
269 | #ifdef HARVARD_CACHE |
270 | mcr p15, 0, r10, c7, c5, 0 @ I+BTB cache invalidate | |
271 | #endif | |
272 | dsb | |
2eb8c82b | 273 | #ifdef CONFIG_MMU |
bbe88886 CM |
274 | mcr p15, 0, r10, c8, c7, 0 @ invalidate I + D TLBs |
275 | mcr p15, 0, r10, c2, c0, 2 @ TTB control register | |
f00ec48f RK |
276 | ALT_SMP(orr r4, r4, #TTB_FLAGS_SMP) |
277 | ALT_UP(orr r4, r4, #TTB_FLAGS_UP) | |
bbe88886 | 278 | mcr p15, 0, r4, c2, c0, 1 @ load TTB1 |
23d1c515 CM |
279 | /* |
280 | * Memory region attributes with SCTLR.TRE=1 | |
281 | * | |
282 | * n = TEX[0],C,B | |
283 | * TR = PRRR[2n+1:2n] - memory type | |
284 | * IR = NMRR[2n+1:2n] - inner cacheable property | |
285 | * OR = NMRR[2n+17:2n+16] - outer cacheable property | |
286 | * | |
287 | * n TR IR OR | |
288 | * UNCACHED 000 00 | |
289 | * BUFFERABLE 001 10 00 00 | |
290 | * WRITETHROUGH 010 10 10 10 | |
291 | * WRITEBACK 011 10 11 11 | |
292 | * reserved 110 | |
293 | * WRITEALLOC 111 10 01 01 | |
294 | * DEV_SHARED 100 01 | |
295 | * DEV_NONSHARED 100 01 | |
296 | * DEV_WC 001 10 | |
297 | * DEV_CACHED 011 10 | |
298 | * | |
299 | * Other attributes: | |
300 | * | |
301 | * DS0 = PRRR[16] = 0 - device shareable property | |
302 | * DS1 = PRRR[17] = 1 - device shareable property | |
303 | * NS0 = PRRR[18] = 0 - normal shareable property | |
304 | * NS1 = PRRR[19] = 1 - normal shareable property | |
305 | * NOS = PRRR[24+n] = 1 - not outer shareable | |
306 | */ | |
307 | ldr r5, =0xff0a81a8 @ PRRR | |
308 | ldr r6, =0x40e040e0 @ NMRR | |
3f69c0c1 RK |
309 | mcr p15, 0, r5, c10, c2, 0 @ write PRRR |
310 | mcr p15, 0, r6, c10, c2, 1 @ write NMRR | |
bdaaaec3 | 311 | #endif |
2eb8c82b CM |
312 | adr r5, v7_crval |
313 | ldmia r5, {r5, r6} | |
26584853 CM |
314 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
315 | orr r6, r6, #1 << 25 @ big-endian page tables | |
64d2dc38 LL |
316 | #endif |
317 | #ifdef CONFIG_SWP_EMULATE | |
318 | orr r5, r5, #(1 << 10) @ set SW bit in "clear" | |
319 | bic r6, r6, #(1 << 10) @ clear it in "mmuset" | |
26584853 | 320 | #endif |
2eb8c82b CM |
321 | mrc p15, 0, r0, c1, c0, 0 @ read control register |
322 | bic r0, r0, r5 @ clear bits them | |
323 | orr r0, r0, r6 @ set them | |
347c8b70 | 324 | THUMB( orr r0, r0, #1 << 30 ) @ Thumb exceptions |
bbe88886 | 325 | mov pc, lr @ return to head.S:__ret |
93ed3970 | 326 | ENDPROC(__v7_setup) |
bbe88886 | 327 | |
b1cce6b1 | 328 | /* AT |
213fb2a8 CM |
329 | * TFR EV X F I D LR S |
330 | * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM | |
b1cce6b1 | 331 | * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced |
213fb2a8 | 332 | * 1 0 110 0011 1100 .111 1101 < we want |
bbe88886 | 333 | */ |
2eb8c82b CM |
334 | .type v7_crval, #object |
335 | v7_crval: | |
213fb2a8 | 336 | crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c |
bbe88886 CM |
337 | |
338 | __v7_setup_stack: | |
339 | .space 4 * 11 @ 11 registers | |
340 | ||
5085f3ff RK |
341 | __INITDATA |
342 | ||
bbe88886 CM |
343 | .type v7_processor_functions, #object |
344 | ENTRY(v7_processor_functions) | |
345 | .word v7_early_abort | |
4fb28474 | 346 | .word v7_pabort |
bbe88886 CM |
347 | .word cpu_v7_proc_init |
348 | .word cpu_v7_proc_fin | |
349 | .word cpu_v7_reset | |
350 | .word cpu_v7_do_idle | |
351 | .word cpu_v7_dcache_clean_area | |
352 | .word cpu_v7_switch_mm | |
353 | .word cpu_v7_set_pte_ext | |
354 | .size v7_processor_functions, . - v7_processor_functions | |
355 | ||
5085f3ff RK |
356 | .section ".rodata" |
357 | ||
bbe88886 CM |
358 | .type cpu_arch_name, #object |
359 | cpu_arch_name: | |
360 | .asciz "armv7" | |
361 | .size cpu_arch_name, . - cpu_arch_name | |
362 | ||
363 | .type cpu_elf_name, #object | |
364 | cpu_elf_name: | |
365 | .asciz "v7" | |
366 | .size cpu_elf_name, . - cpu_elf_name | |
367 | .align | |
368 | ||
369 | .section ".proc.info.init", #alloc, #execinstr | |
370 | ||
14eff181 DW |
371 | .type __v7_ca9mp_proc_info, #object |
372 | __v7_ca9mp_proc_info: | |
373 | .long 0x410fc090 @ Required ID value | |
374 | .long 0xff0ffff0 @ Mask for ID | |
f00ec48f RK |
375 | ALT_SMP(.long \ |
376 | PMD_TYPE_SECT | \ | |
377 | PMD_SECT_AP_WRITE | \ | |
378 | PMD_SECT_AP_READ | \ | |
379 | PMD_FLAGS_SMP) | |
380 | ALT_UP(.long \ | |
381 | PMD_TYPE_SECT | \ | |
14eff181 DW |
382 | PMD_SECT_AP_WRITE | \ |
383 | PMD_SECT_AP_READ | \ | |
f00ec48f | 384 | PMD_FLAGS_UP) |
14eff181 DW |
385 | .long PMD_TYPE_SECT | \ |
386 | PMD_SECT_XN | \ | |
387 | PMD_SECT_AP_WRITE | \ | |
388 | PMD_SECT_AP_READ | |
6323875d | 389 | W(b) __v7_ca9mp_setup |
14eff181 DW |
390 | .long cpu_arch_name |
391 | .long cpu_elf_name | |
c0bb5862 | 392 | .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS |
14eff181 DW |
393 | .long cpu_v7_name |
394 | .long v7_processor_functions | |
395 | .long v7wbi_tlb_fns | |
396 | .long v6_user_fns | |
397 | .long v7_cache_fns | |
398 | .size __v7_ca9mp_proc_info, . - __v7_ca9mp_proc_info | |
399 | ||
bbe88886 CM |
400 | /* |
401 | * Match any ARMv7 processor core. | |
402 | */ | |
403 | .type __v7_proc_info, #object | |
404 | __v7_proc_info: | |
405 | .long 0x000f0000 @ Required ID value | |
406 | .long 0x000f0000 @ Mask for ID | |
f00ec48f RK |
407 | ALT_SMP(.long \ |
408 | PMD_TYPE_SECT | \ | |
409 | PMD_SECT_AP_WRITE | \ | |
410 | PMD_SECT_AP_READ | \ | |
411 | PMD_FLAGS_SMP) | |
412 | ALT_UP(.long \ | |
413 | PMD_TYPE_SECT | \ | |
bbe88886 | 414 | PMD_SECT_AP_WRITE | \ |
4b46d641 | 415 | PMD_SECT_AP_READ | \ |
f00ec48f | 416 | PMD_FLAGS_UP) |
bbe88886 CM |
417 | .long PMD_TYPE_SECT | \ |
418 | PMD_SECT_XN | \ | |
419 | PMD_SECT_AP_WRITE | \ | |
420 | PMD_SECT_AP_READ | |
6323875d | 421 | W(b) __v7_setup |
bbe88886 CM |
422 | .long cpu_arch_name |
423 | .long cpu_elf_name | |
f159f4ed | 424 | .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS |
bbe88886 CM |
425 | .long cpu_v7_name |
426 | .long v7_processor_functions | |
2ccdd1e7 | 427 | .long v7wbi_tlb_fns |
bbe88886 CM |
428 | .long v6_user_fns |
429 | .long v7_cache_fns | |
430 | .size __v7_proc_info, . - __v7_proc_info |