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   1 /*
   2  *  linux/arch/arm/mm/proc-arm6,7.S
   3  *
   4  *  Copyright (C) 1997-2000 Russell King
   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  *  These are the low level assembler for performing cache and TLB
  11  *  functions on the ARM610 & ARM710.
  12  */
  13 #include <linux/linkage.h>
  14 #include <linux/init.h>
  15 #include <asm/assembler.h>
  16 #include <asm/constants.h>
  17 #include <asm/pgtable.h>
  18 #include <asm/procinfo.h>
  19 #include <asm/ptrace.h>
  20
  21 ENTRY(cpu_arm6_dcache_clean_area)
  22 ENTRY(cpu_arm7_dcache_clean_area)
  23                 mov     pc, lr
  24
  25 /*
  26  * Function: arm6_7_data_abort ()
  27  *
  28  * Params  : r2 = address of aborted instruction
  29  *         : sp = pointer to registers
  30  *
  31  * Purpose : obtain information about current aborted instruction
  32  *
  33  * Returns : r0 = address of abort
  34  *         : r1 = FSR
  35  */
  36
  37 ENTRY(cpu_arm7_data_abort)
  38         mrc     p15, 0, r1, c5, c0, 0           @ get FSR
  39         mrc     p15, 0, r0, c6, c0, 0           @ get FAR
  40         ldr     r8, [r0]                        @ read arm instruction
  41         tst     r8, #1 << 20                    @ L = 0 -> write?
  42         orreq   r1, r1, #1 << 11                @ yes.
  43         and     r7, r8, #15 << 24
  44         add     pc, pc, r7, lsr #22             @ Now branch to the relevant processing routine
  45         nop
  46
  47 /* 0 */ b       .data_unknown
  48 /* 1 */ mov     pc, lr                          @ swp
  49 /* 2 */ b       .data_unknown
  50 /* 3 */ b       .data_unknown
  51 /* 4 */ b       .data_arm_lateldrpostconst      @ ldr   rd, [rn], #m
  52 /* 5 */ b       .data_arm_lateldrpreconst       @ ldr   rd, [rn, #m]
  53 /* 6 */ b       .data_arm_lateldrpostreg        @ ldr   rd, [rn], rm
  54 /* 7 */ b       .data_arm_lateldrprereg         @ ldr   rd, [rn, rm]
  55 /* 8 */ b       .data_arm_ldmstm                @ ldm*a rn, <rlist>
  56 /* 9 */ b       .data_arm_ldmstm                @ ldm*b rn, <rlist>
  57 /* a */ b       .data_unknown
  58 /* b */ b       .data_unknown
  59 /* c */ mov     pc, lr                          @ ldc   rd, [rn], #m    @ Same as ldr   rd, [rn], #m
  60 /* d */ mov     pc, lr                          @ ldc   rd, [rn, #m]
  61 /* e */ b       .data_unknown
  62 /* f */
  63 .data_unknown:  @ Part of jumptable
  64         mov     r0, r2
  65         mov     r1, r8
  66         mov     r2, sp
  67         bl      baddataabort
  68         b       ret_from_exception
  69
  70 ENTRY(cpu_arm6_data_abort)
  71         mrc     p15, 0, r1, c5, c0, 0           @ get FSR
  72         mrc     p15, 0, r0, c6, c0, 0           @ get FAR
  73         ldr     r8, [r2]                        @ read arm instruction
  74         tst     r8, #1 << 20                    @ L = 0 -> write?
  75         orreq   r1, r1, #1 << 11                @ yes.
  76         and     r7, r8, #14 << 24
  77         teq     r7, #8 << 24                    @ was it ldm/stm
  78         movne   pc, lr
  79
  80 .data_arm_ldmstm:
  81         tst     r8, #1 << 21                    @ check writeback bit
  82         moveq   pc, lr                          @ no writeback -> no fixup
  83         mov     r7, #0x11
  84         orr     r7, r7, #0x1100
  85         and     r6, r8, r7
  86         and     r2, r8, r7, lsl #1
  87         add     r6, r6, r2, lsr #1
  88         and     r2, r8, r7, lsl #2
  89         add     r6, r6, r2, lsr #2
  90         and     r2, r8, r7, lsl #3
  91         add     r6, r6, r2, lsr #3
  92         add     r6, r6, r6, lsr #8
  93         add     r6, r6, r6, lsr #4
  94         and     r6, r6, #15                     @ r6 = no. of registers to transfer.
  95         and     r5, r8, #15 << 16               @ Extract 'n' from instruction
  96         ldr     r7, [sp, r5, lsr #14]           @ Get register 'Rn'
  97         tst     r8, #1 << 23                    @ Check U bit
  98         subne   r7, r7, r6, lsl #2              @ Undo increment
  99         addeq   r7, r7, r6, lsl #2              @ Undo decrement
 100         str     r7, [sp, r5, lsr #14]           @ Put register 'Rn'
 101         mov     pc, lr
 102
 103 .data_arm_apply_r6_and_rn:
 104         and     r5, r8, #15 << 16               @ Extract 'n' from instruction
 105         ldr     r7, [sp, r5, lsr #14]           @ Get register 'Rn'
 106         tst     r8, #1 << 23                    @ Check U bit
 107         subne   r7, r7, r6                      @ Undo incrmenet
 108         addeq   r7, r7, r6                      @ Undo decrement
 109         str     r7, [sp, r5, lsr #14]           @ Put register 'Rn'
 110         mov     pc, lr
 111
 112 .data_arm_lateldrpreconst:
 113         tst     r8, #1 << 21                    @ check writeback bit
 114         moveq   pc, lr                          @ no writeback -> no fixup
 115 .data_arm_lateldrpostconst:
 116         movs    r2, r8, lsl #20                 @ Get offset
 117         moveq   pc, lr                          @ zero -> no fixup
 118         and     r5, r8, #15 << 16               @ Extract 'n' from instruction
 119         ldr     r7, [sp, r5, lsr #14]           @ Get register 'Rn'
 120         tst     r8, #1 << 23                    @ Check U bit
 121         subne   r7, r7, r2, lsr #20             @ Undo increment
 122         addeq   r7, r7, r2, lsr #20             @ Undo decrement
 123         str     r7, [sp, r5, lsr #14]           @ Put register 'Rn'
 124         mov     pc, lr
 125
 126 .data_arm_lateldrprereg:
 127         tst     r8, #1 << 21                    @ check writeback bit
 128         moveq   pc, lr                          @ no writeback -> no fixup
 129 .data_arm_lateldrpostreg:
 130         and     r7, r8, #15                     @ Extract 'm' from instruction
 131         ldr     r6, [sp, r7, lsl #2]            @ Get register 'Rm'
 132         mov     r5, r8, lsr #7                  @ get shift count
 133         ands    r5, r5, #31
 134         and     r7, r8, #0x70                   @ get shift type
 135         orreq   r7, r7, #8                      @ shift count = 0
 136         add     pc, pc, r7
 137         nop
 138
 139         mov     r6, r6, lsl r5                  @ 0: LSL #!0
 140         b       .data_arm_apply_r6_and_rn
 141         b       .data_arm_apply_r6_and_rn       @ 1: LSL #0
 142         nop
 143         b       .data_unknown                   @ 2: MUL?
 144         nop
 145         b       .data_unknown                   @ 3: MUL?
 146         nop
 147         mov     r6, r6, lsr r5                  @ 4: LSR #!0
 148         b       .data_arm_apply_r6_and_rn
 149         mov     r6, r6, lsr #32                 @ 5: LSR #32
 150         b       .data_arm_apply_r6_and_rn
 151         b       .data_unknown                   @ 6: MUL?
 152         nop
 153         b       .data_unknown                   @ 7: MUL?
 154         nop
 155         mov     r6, r6, asr r5                  @ 8: ASR #!0
 156         b       .data_arm_apply_r6_and_rn
 157         mov     r6, r6, asr #32                 @ 9: ASR #32
 158         b       .data_arm_apply_r6_and_rn
 159         b       .data_unknown                   @ A: MUL?
 160         nop
 161         b       .data_unknown                   @ B: MUL?
 162         nop
 163         mov     r6, r6, ror r5                  @ C: ROR #!0
 164         b       .data_arm_apply_r6_and_rn
 165         mov     r6, r6, rrx                     @ D: RRX
 166         b       .data_arm_apply_r6_and_rn
 167         b       .data_unknown                   @ E: MUL?
 168         nop
 169         b       .data_unknown                   @ F: MUL?
 170
 171 /*
 172  * Function: arm6_7_proc_init (void)
 173  *         : arm6_7_proc_fin (void)
 174  *
 175  * Notes   : This processor does not require these
 176  */
 177 ENTRY(cpu_arm6_proc_init)
 178 ENTRY(cpu_arm7_proc_init)
 179                 mov     pc, lr
 180
 181 ENTRY(cpu_arm6_proc_fin)
 182 ENTRY(cpu_arm7_proc_fin)
 183                 mov     r0, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
 184                 msr     cpsr_c, r0
 185                 mov     r0, #0x31                       @ ....S..DP...M
 186                 mcr     p15, 0, r0, c1, c0, 0           @ disable caches
 187                 mov     pc, lr
 188
 189 ENTRY(cpu_arm6_do_idle)
 190 ENTRY(cpu_arm7_do_idle)
 191                 mov     pc, lr
 192
 193 /*
 194  * Function: arm6_7_switch_mm(unsigned long pgd_phys)
 195  * Params  : pgd_phys   Physical address of page table
 196  * Purpose : Perform a task switch, saving the old processes state, and restoring
 197  *           the new.
 198  */
 199 ENTRY(cpu_arm6_switch_mm)
 200 ENTRY(cpu_arm7_switch_mm)
 201                 mov     r1, #0
 202                 mcr     p15, 0, r1, c7, c0, 0           @ flush cache
 203                 mcr     p15, 0, r0, c2, c0, 0           @ update page table ptr
 204                 mcr     p15, 0, r1, c5, c0, 0           @ flush TLBs
 205                 mov     pc, lr
 206
 207 /*
 208  * Function: arm6_7_set_pte(pte_t *ptep, pte_t pte)
 209  * Params  : r0 = Address to set
 210  *         : r1 = value to set
 211  * Purpose : Set a PTE and flush it out of any WB cache
 212  */
 213                 .align  5
 214 ENTRY(cpu_arm6_set_pte)
 215 ENTRY(cpu_arm7_set_pte)
 216                 str     r1, [r0], #-2048                @ linux version
 217
 218                 eor     r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
 219
 220                 bic     r2, r1, #PTE_SMALL_AP_MASK
 221                 bic     r2, r2, #PTE_TYPE_MASK
 222                 orr     r2, r2, #PTE_TYPE_SMALL
 223
 224                 tst     r1, #L_PTE_USER                 @ User?
 225                 orrne   r2, r2, #PTE_SMALL_AP_URO_SRW
 226
 227                 tst     r1, #L_PTE_WRITE | L_PTE_DIRTY  @ Write and Dirty?
 228                 orreq   r2, r2, #PTE_SMALL_AP_UNO_SRW
 229
 230                 tst     r1, #L_PTE_PRESENT | L_PTE_YOUNG        @ Present and Young
 231                 movne   r2, #0
 232
 233                 str     r2, [r0]                        @ hardware version
 234                 mov     pc, lr
 235
 236 /*
 237  * Function: _arm6_7_reset
 238  * Params  : r0 = address to jump to
 239  * Notes   : This sets up everything for a reset
 240  */
 241 ENTRY(cpu_arm6_reset)
 242 ENTRY(cpu_arm7_reset)
 243                 mov     r1, #0
 244                 mcr     p15, 0, r1, c7, c0, 0           @ flush cache
 245                 mcr     p15, 0, r1, c5, c0, 0           @ flush TLB
 246                 mov     r1, #0x30
 247                 mcr     p15, 0, r1, c1, c0, 0           @ turn off MMU etc
 248                 mov     pc, r0
 249
 250                 __INIT
 251
 252                 .type   __arm6_setup, #function
 253 __arm6_setup:   mov     r0, #0
 254                 mcr     p15, 0, r0, c7, c0              @ flush caches on v3
 255                 mcr     p15, 0, r0, c5, c0              @ flush TLBs on v3
 256                 mov     r0, #0x3d                       @ . ..RS BLDP WCAM
 257                 orr     r0, r0, #0x100                  @ . ..01 0011 1101
 258                 mov     pc, lr
 259                 .size   __arm6_setup, . - __arm6_setup
 260
 261                 .type   __arm7_setup, #function
 262 __arm7_setup:   mov     r0, #0
 263                 mcr     p15, 0, r0, c7, c0              @ flush caches on v3
 264                 mcr     p15, 0, r0, c5, c0              @ flush TLBs on v3
 265                 mcr     p15, 0, r0, c3, c0              @ load domain access register
 266                 mov     r0, #0x7d                       @ . ..RS BLDP WCAM
 267                 orr     r0, r0, #0x100                  @ . ..01 0111 1101
 268                 mov     pc, lr
 269                 .size   __arm7_setup, . - __arm7_setup
 270
 271                 __INITDATA
 272
 273 /*
 274  * Purpose : Function pointers used to access above functions - all calls
 275  *           come through these
 276  */
 277                 .type   arm6_processor_functions, #object
 278 ENTRY(arm6_processor_functions)
 279                 .word   cpu_arm6_data_abort
 280                 .word   cpu_arm6_proc_init
 281                 .word   cpu_arm6_proc_fin
 282                 .word   cpu_arm6_reset
 283                 .word   cpu_arm6_do_idle
 284                 .word   cpu_arm6_dcache_clean_area
 285                 .word   cpu_arm6_switch_mm
 286                 .word   cpu_arm6_set_pte
 287                 .size   arm6_processor_functions, . - arm6_processor_functions
 288
 289 /*
 290  * Purpose : Function pointers used to access above functions - all calls
 291  *           come through these
 292  */
 293                 .type   arm7_processor_functions, #object
 294 ENTRY(arm7_processor_functions)
 295                 .word   cpu_arm7_data_abort
 296                 .word   cpu_arm7_proc_init
 297                 .word   cpu_arm7_proc_fin
 298                 .word   cpu_arm7_reset
 299                 .word   cpu_arm7_do_idle
 300                 .word   cpu_arm7_dcache_clean_area
 301                 .word   cpu_arm7_switch_mm
 302                 .word   cpu_arm7_set_pte
 303                 .size   arm7_processor_functions, . - arm7_processor_functions
 304
 305                 .section ".rodata"
 306
 307                 .type   cpu_arch_name, #object
 308 cpu_arch_name:  .asciz  "armv3"
 309                 .size   cpu_arch_name, . - cpu_arch_name
 310
 311                 .type   cpu_elf_name, #object
 312 cpu_elf_name:   .asciz  "v3"
 313                 .size   cpu_elf_name, . - cpu_elf_name
 314
 315                 .type   cpu_arm6_name, #object
 316 cpu_arm6_name:  .asciz  "ARM6"
 317                 .size   cpu_arm6_name, . - cpu_arm6_name
 318
 319                 .type   cpu_arm610_name, #object
 320 cpu_arm610_name:
 321                 .asciz  "ARM610"
 322                 .size   cpu_arm610_name, . - cpu_arm610_name
 323
 324                 .type   cpu_arm7_name, #object
 325 cpu_arm7_name:  .asciz  "ARM7"
 326                 .size   cpu_arm7_name, . - cpu_arm7_name
 327
 328                 .type   cpu_arm710_name, #object
 329 cpu_arm710_name:
 330                 .asciz  "ARM710"
 331                 .size   cpu_arm710_name, . - cpu_arm710_name
 332
 333                 .align
 334
 335                 .section ".proc.info", #alloc, #execinstr
 336
 337                 .type   __arm6_proc_info, #object
 338 __arm6_proc_info:
 339                 .long   0x41560600
 340                 .long   0xfffffff0
 341                 .long   0x00000c1e
 342                 b       __arm6_setup
 343                 .long   cpu_arch_name
 344                 .long   cpu_elf_name
 345                 .long   HWCAP_SWP | HWCAP_26BIT
 346                 .long   cpu_arm6_name
 347                 .long   arm6_processor_functions
 348                 .long   v3_tlb_fns
 349                 .long   v3_user_fns
 350                 .long   v3_cache_fns
 351                 .size   __arm6_proc_info, . - __arm6_proc_info
 352
 353                 .type   __arm610_proc_info, #object
 354 __arm610_proc_info:
 355                 .long   0x41560610
 356                 .long   0xfffffff0
 357                 .long   0x00000c1e
 358                 b       __arm6_setup
 359                 .long   cpu_arch_name
 360                 .long   cpu_elf_name
 361                 .long   HWCAP_SWP | HWCAP_26BIT
 362                 .long   cpu_arm610_name
 363                 .long   arm6_processor_functions
 364                 .long   v3_tlb_fns
 365                 .long   v3_user_fns
 366                 .long   v3_cache_fns
 367                 .size   __arm610_proc_info, . - __arm610_proc_info
 368
 369                 .type   __arm7_proc_info, #object
 370 __arm7_proc_info:
 371                 .long   0x41007000
 372                 .long   0xffffff00
 373                 .long   0x00000c1e
 374                 b       __arm7_setup
 375                 .long   cpu_arch_name
 376                 .long   cpu_elf_name
 377                 .long   HWCAP_SWP | HWCAP_26BIT
 378                 .long   cpu_arm7_name
 379                 .long   arm7_processor_functions
 380                 .long   v3_tlb_fns
 381                 .long   v3_user_fns
 382                 .long   v3_cache_fns
 383                 .size   __arm7_proc_info, . - __arm7_proc_info
 384
 385                 .type   __arm710_proc_info, #object
 386 __arm710_proc_info:
 387                 .long   0x41007100
 388                 .long   0xfff8ff00
 389                 .long   PMD_TYPE_SECT | \
 390                         PMD_SECT_BUFFERABLE | \
 391                         PMD_SECT_CACHEABLE | \
 392                         PMD_BIT4 | \
 393                         PMD_SECT_AP_WRITE | \
 394                         PMD_SECT_AP_READ
 395                 b       __arm7_setup
 396                 .long   cpu_arch_name
 397                 .long   cpu_elf_name
 398                 .long   HWCAP_SWP | HWCAP_26BIT
 399                 .long   cpu_arm710_name
 400                 .long   arm7_processor_functions
 401                 .long   v3_tlb_fns
 402                 .long   v3_user_fns
 403                 .long   v3_cache_fns
 404                 .size   __arm710_proc_info, . - __arm710_proc_info