| blob | 3f9cd3d8f6d508c447e46c5cf29ca078dd1b630b |
1 /*
2 * linux/arch/arm/mm/proc-arm6,7.S
3 *
4 * Copyright (C) 1997-2000 Russell King
5 * hacked for non-paged-MM by Hyok S. Choi, 2003.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * These are the low level assembler for performing cache and TLB
12 * functions on the ARM610 & ARM710.
13 */
14 #include <linux/linkage.h>
15 #include <linux/init.h>
16 #include <asm/assembler.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/hwcap.h>
19 #include <asm/pgtable-hwdef.h>
20 #include <asm/pgtable.h>
21 #include <asm/ptrace.h>
23 #include "proc-macros.S"
25 ENTRY(cpu_arm6_dcache_clean_area)
26 ENTRY(cpu_arm7_dcache_clean_area)
27 mov pc, lr
29 /*
30 * Function: arm6_7_data_abort ()
31 *
32 * Params : r2 = address of aborted instruction
33 * : sp = pointer to registers
34 *
35 * Purpose : obtain information about current aborted instruction
36 *
37 * Returns : r0 = address of abort
38 * : r1 = FSR
39 */
41 ENTRY(cpu_arm7_data_abort)
42 mrc p15, 0, r1, c5, c0, 0 @ get FSR
43 mrc p15, 0, r0, c6, c0, 0 @ get FAR
44 ldr r8, [r0] @ read arm instruction
45 tst r8, #1 << 20 @ L = 0 -> write?
46 orreq r1, r1, #1 << 11 @ yes.
47 and r7, r8, #15 << 24
48 add pc, pc, r7, lsr #22 @ Now branch to the relevant processing routine
49 nop
51 /* 0 */ b .data_unknown
52 /* 1 */ mov pc, lr @ swp
53 /* 2 */ b .data_unknown
54 /* 3 */ b .data_unknown
55 /* 4 */ b .data_arm_lateldrpostconst @ ldr rd, [rn], #m
56 /* 5 */ b .data_arm_lateldrpreconst @ ldr rd, [rn, #m]
57 /* 6 */ b .data_arm_lateldrpostreg @ ldr rd, [rn], rm
58 /* 7 */ b .data_arm_lateldrprereg @ ldr rd, [rn, rm]
59 /* 8 */ b .data_arm_ldmstm @ ldm*a rn, <rlist>
60 /* 9 */ b .data_arm_ldmstm @ ldm*b rn, <rlist>
61 /* a */ b .data_unknown
62 /* b */ b .data_unknown
63 /* c */ mov pc, lr @ ldc rd, [rn], #m @ Same as ldr rd, [rn], #m
64 /* d */ mov pc, lr @ ldc rd, [rn, #m]
65 /* e */ b .data_unknown
66 /* f */
67 .data_unknown: @ Part of jumptable
68 mov r0, r2
69 mov r1, r8
70 mov r2, sp
71 bl baddataabort
72 b ret_from_exception
74 ENTRY(cpu_arm6_data_abort)
75 mrc p15, 0, r1, c5, c0, 0 @ get FSR
76 mrc p15, 0, r0, c6, c0, 0 @ get FAR
77 ldr r8, [r2] @ read arm instruction
78 tst r8, #1 << 20 @ L = 0 -> write?
79 orreq r1, r1, #1 << 11 @ yes.
80 and r7, r8, #14 << 24
81 teq r7, #8 << 24 @ was it ldm/stm
82 movne pc, lr
84 .data_arm_ldmstm:
85 tst r8, #1 << 21 @ check writeback bit
86 moveq pc, lr @ no writeback -> no fixup
87 mov r7, #0x11
88 orr r7, r7, #0x1100
89 and r6, r8, r7
90 and r2, r8, r7, lsl #1
91 add r6, r6, r2, lsr #1
92 and r2, r8, r7, lsl #2
93 add r6, r6, r2, lsr #2
94 and r2, r8, r7, lsl #3
95 add r6, r6, r2, lsr #3
96 add r6, r6, r6, lsr #8
97 add r6, r6, r6, lsr #4
98 and r6, r6, #15 @ r6 = no. of registers to transfer.
99 and r5, r8, #15 << 16 @ Extract 'n' from instruction
100 ldr r7, [sp, r5, lsr #14] @ Get register 'Rn'
101 tst r8, #1 << 23 @ Check U bit
102 subne r7, r7, r6, lsl #2 @ Undo increment
103 addeq r7, r7, r6, lsl #2 @ Undo decrement
104 str r7, [sp, r5, lsr #14] @ Put register 'Rn'
105 mov pc, lr
107 .data_arm_apply_r6_and_rn:
108 and r5, r8, #15 << 16 @ Extract 'n' from instruction
109 ldr r7, [sp, r5, lsr #14] @ Get register 'Rn'
110 tst r8, #1 << 23 @ Check U bit
111 subne r7, r7, r6 @ Undo incrmenet
112 addeq r7, r7, r6 @ Undo decrement
113 str r7, [sp, r5, lsr #14] @ Put register 'Rn'
114 mov pc, lr
116 .data_arm_lateldrpreconst:
117 tst r8, #1 << 21 @ check writeback bit
118 moveq pc, lr @ no writeback -> no fixup
119 .data_arm_lateldrpostconst:
120 movs r2, r8, lsl #20 @ Get offset
121 moveq pc, lr @ zero -> no fixup
122 and r5, r8, #15 << 16 @ Extract 'n' from instruction
123 ldr r7, [sp, r5, lsr #14] @ Get register 'Rn'
124 tst r8, #1 << 23 @ Check U bit
125 subne r7, r7, r2, lsr #20 @ Undo increment
126 addeq r7, r7, r2, lsr #20 @ Undo decrement
127 str r7, [sp, r5, lsr #14] @ Put register 'Rn'
128 mov pc, lr
130 .data_arm_lateldrprereg:
131 tst r8, #1 << 21 @ check writeback bit
132 moveq pc, lr @ no writeback -> no fixup
133 .data_arm_lateldrpostreg:
134 and r7, r8, #15 @ Extract 'm' from instruction
135 ldr r6, [sp, r7, lsl #2] @ Get register 'Rm'
136 mov r5, r8, lsr #7 @ get shift count
137 ands r5, r5, #31
138 and r7, r8, #0x70 @ get shift type
139 orreq r7, r7, #8 @ shift count = 0
140 add pc, pc, r7
141 nop
143 mov r6, r6, lsl r5 @ 0: LSL #!0
144 b .data_arm_apply_r6_and_rn
145 b .data_arm_apply_r6_and_rn @ 1: LSL #0
146 nop
147 b .data_unknown @ 2: MUL?
148 nop
149 b .data_unknown @ 3: MUL?
150 nop
151 mov r6, r6, lsr r5 @ 4: LSR #!0
152 b .data_arm_apply_r6_and_rn
153 mov r6, r6, lsr #32 @ 5: LSR #32
154 b .data_arm_apply_r6_and_rn
155 b .data_unknown @ 6: MUL?
156 nop
157 b .data_unknown @ 7: MUL?
158 nop
159 mov r6, r6, asr r5 @ 8: ASR #!0
160 b .data_arm_apply_r6_and_rn
161 mov r6, r6, asr #32 @ 9: ASR #32
162 b .data_arm_apply_r6_and_rn
163 b .data_unknown @ A: MUL?
164 nop
165 b .data_unknown @ B: MUL?
166 nop
167 mov r6, r6, ror r5 @ C: ROR #!0
168 b .data_arm_apply_r6_and_rn
169 mov r6, r6, rrx @ D: RRX
170 b .data_arm_apply_r6_and_rn
171 b .data_unknown @ E: MUL?
172 nop
173 b .data_unknown @ F: MUL?
175 /*
176 * Function: arm6_7_proc_init (void)
177 * : arm6_7_proc_fin (void)
178 *
179 * Notes : This processor does not require these
180 */
181 ENTRY(cpu_arm6_proc_init)
182 ENTRY(cpu_arm7_proc_init)
183 mov pc, lr
185 ENTRY(cpu_arm6_proc_fin)
186 ENTRY(cpu_arm7_proc_fin)
187 mov r0, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
188 msr cpsr_c, r0
189 mov r0, #0x31 @ ....S..DP...M
190 mcr p15, 0, r0, c1, c0, 0 @ disable caches
191 mov pc, lr
193 ENTRY(cpu_arm6_do_idle)
194 ENTRY(cpu_arm7_do_idle)
195 mov pc, lr
197 /*
198 * Function: arm6_7_switch_mm(unsigned long pgd_phys)
199 * Params : pgd_phys Physical address of page table
200 * Purpose : Perform a task switch, saving the old processes state, and restoring
201 * the new.
202 */
203 ENTRY(cpu_arm6_switch_mm)
204 ENTRY(cpu_arm7_switch_mm)
205 #ifdef CONFIG_MMU
206 mov r1, #0
207 mcr p15, 0, r1, c7, c0, 0 @ flush cache
208 mcr p15, 0, r0, c2, c0, 0 @ update page table ptr
209 mcr p15, 0, r1, c5, c0, 0 @ flush TLBs
210 #endif
211 mov pc, lr
213 /*
214 * Function: arm6_7_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext)
215 * Params : r0 = Address to set
216 * : r1 = value to set
217 * Purpose : Set a PTE and flush it out of any WB cache
218 */
219 .align 5
220 ENTRY(cpu_arm6_set_pte_ext)
221 ENTRY(cpu_arm7_set_pte_ext)
222 #ifdef CONFIG_MMU
223 armv3_set_pte_ext wc_disable=0
224 #endif /* CONFIG_MMU */
225 mov pc, lr
227 /*
228 * Function: _arm6_7_reset
229 * Params : r0 = address to jump to
230 * Notes : This sets up everything for a reset
231 */
232 ENTRY(cpu_arm6_reset)
233 ENTRY(cpu_arm7_reset)
234 mov r1, #0
235 mcr p15, 0, r1, c7, c0, 0 @ flush cache
236 #ifdef CONFIG_MMU
237 mcr p15, 0, r1, c5, c0, 0 @ flush TLB
238 #endif
239 mov r1, #0x30
240 mcr p15, 0, r1, c1, c0, 0 @ turn off MMU etc
241 mov pc, r0
243 __INIT
245 .type __arm6_setup, #function
246 __arm6_setup: mov r0, #0
247 mcr p15, 0, r0, c7, c0 @ flush caches on v3
248 #ifdef CONFIG_MMU
249 mcr p15, 0, r0, c5, c0 @ flush TLBs on v3
250 mov r0, #0x3d @ . ..RS BLDP WCAM
251 orr r0, r0, #0x100 @ . ..01 0011 1101
252 #else
253 mov r0, #0x3c @ . ..RS BLDP WCA.
254 #endif
255 mov pc, lr
256 .size __arm6_setup, . - __arm6_setup
258 .type __arm7_setup, #function
259 __arm7_setup: mov r0, #0
260 mcr p15, 0, r0, c7, c0 @ flush caches on v3
261 #ifdef CONFIG_MMU
262 mcr p15, 0, r0, c5, c0 @ flush TLBs on v3
263 mcr p15, 0, r0, c3, c0 @ load domain access register
264 mov r0, #0x7d @ . ..RS BLDP WCAM
265 orr r0, r0, #0x100 @ . ..01 0111 1101
266 #else
267 mov r0, #0x7c @ . ..RS BLDP WCA.
268 #endif
269 mov pc, lr
270 .size __arm7_setup, . - __arm7_setup
272 __INITDATA
274 /*
275 * Purpose : Function pointers used to access above functions - all calls
276 * come through these
277 */
278 .type arm6_processor_functions, #object
279 ENTRY(arm6_processor_functions)
280 .word cpu_arm6_data_abort
281 .word legacy_pabort
282 .word cpu_arm6_proc_init
283 .word cpu_arm6_proc_fin
284 .word cpu_arm6_reset
285 .word cpu_arm6_do_idle
286 .word cpu_arm6_dcache_clean_area
287 .word cpu_arm6_switch_mm
288 .word cpu_arm6_set_pte_ext
289 .size arm6_processor_functions, . - arm6_processor_functions
291 /*
292 * Purpose : Function pointers used to access above functions - all calls
293 * come through these
294 */
295 .type arm7_processor_functions, #object
296 ENTRY(arm7_processor_functions)
297 .word cpu_arm7_data_abort
298 .word legacy_pabort
299 .word cpu_arm7_proc_init
300 .word cpu_arm7_proc_fin
301 .word cpu_arm7_reset
302 .word cpu_arm7_do_idle
303 .word cpu_arm7_dcache_clean_area
304 .word cpu_arm7_switch_mm
305 .word cpu_arm7_set_pte_ext
306 .size arm7_processor_functions, . - arm7_processor_functions
308 .section ".rodata"
310 .type cpu_arch_name, #object
311 cpu_arch_name: .asciz "armv3"
312 .size cpu_arch_name, . - cpu_arch_name
314 .type cpu_elf_name, #object
315 cpu_elf_name: .asciz "v3"
316 .size cpu_elf_name, . - cpu_elf_name
318 .type cpu_arm6_name, #object
319 cpu_arm6_name: .asciz "ARM6"
320 .size cpu_arm6_name, . - cpu_arm6_name
322 .type cpu_arm610_name, #object
323 cpu_arm610_name:
324 .asciz "ARM610"
325 .size cpu_arm610_name, . - cpu_arm610_name
327 .type cpu_arm7_name, #object
328 cpu_arm7_name: .asciz "ARM7"
329 .size cpu_arm7_name, . - cpu_arm7_name
331 .type cpu_arm710_name, #object
332 cpu_arm710_name:
333 .asciz "ARM710"
334 .size cpu_arm710_name, . - cpu_arm710_name
336 .align
338 .section ".proc.info.init", #alloc, #execinstr
340 .type __arm6_proc_info, #object
341 __arm6_proc_info:
342 .long 0x41560600
343 .long 0xfffffff0
344 .long 0x00000c1e
345 .long PMD_TYPE_SECT | \
346 PMD_BIT4 | \
347 PMD_SECT_AP_WRITE | \
348 PMD_SECT_AP_READ
349 b __arm6_setup
350 .long cpu_arch_name
351 .long cpu_elf_name
352 .long HWCAP_SWP | HWCAP_26BIT
353 .long cpu_arm6_name
354 .long arm6_processor_functions
355 .long v3_tlb_fns
356 .long v3_user_fns
357 .long v3_cache_fns
358 .size __arm6_proc_info, . - __arm6_proc_info
360 .type __arm610_proc_info, #object
361 __arm610_proc_info:
362 .long 0x41560610
363 .long 0xfffffff0
364 .long 0x00000c1e
365 .long PMD_TYPE_SECT | \
366 PMD_BIT4 | \
367 PMD_SECT_AP_WRITE | \
368 PMD_SECT_AP_READ
369 b __arm6_setup
370 .long cpu_arch_name
371 .long cpu_elf_name
372 .long HWCAP_SWP | HWCAP_26BIT
373 .long cpu_arm610_name
374 .long arm6_processor_functions
375 .long v3_tlb_fns
376 .long v3_user_fns
377 .long v3_cache_fns
378 .size __arm610_proc_info, . - __arm610_proc_info
380 .type __arm7_proc_info, #object
381 __arm7_proc_info:
382 .long 0x41007000
383 .long 0xffffff00
384 .long 0x00000c1e
385 .long PMD_TYPE_SECT | \
386 PMD_BIT4 | \
387 PMD_SECT_AP_WRITE | \
388 PMD_SECT_AP_READ
389 b __arm7_setup
390 .long cpu_arch_name
391 .long cpu_elf_name
392 .long HWCAP_SWP | HWCAP_26BIT
393 .long cpu_arm7_name
394 .long arm7_processor_functions
395 .long v3_tlb_fns
396 .long v3_user_fns
397 .long v3_cache_fns
398 .size __arm7_proc_info, . - __arm7_proc_info
400 .type __arm710_proc_info, #object
401 __arm710_proc_info:
402 .long 0x41007100
403 .long 0xfff8ff00
404 .long PMD_TYPE_SECT | \
405 PMD_SECT_BUFFERABLE | \
406 PMD_SECT_CACHEABLE | \
407 PMD_BIT4 | \
408 PMD_SECT_AP_WRITE | \
409 PMD_SECT_AP_READ
410 .long PMD_TYPE_SECT | \
411 PMD_BIT4 | \
412 PMD_SECT_AP_WRITE | \
413 PMD_SECT_AP_READ
414 b __arm7_setup
415 .long cpu_arch_name
416 .long cpu_elf_name
417 .long HWCAP_SWP | HWCAP_26BIT
418 .long cpu_arm710_name
419 .long arm7_processor_functions
420 .long v3_tlb_fns
421 .long v3_user_fns
422 .long v3_cache_fns
423 .size __arm710_proc_info, . - __arm710_proc_info