1/* 2 * linux/arch/arm/mm/proc-arm926.S: MMU functions for ARM926EJ-S 3 * 4 * Copyright (C) 1999-2001 ARM Limited 5 * Copyright (C) 2000 Deep Blue Solutions Ltd. 6 * hacked for non-paged-MM by Hyok S. Choi, 2003. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 * 23 * These are the low level assembler for performing cache and TLB 24 * functions on the arm926. 25 * 26 * CONFIG_CPU_ARM926_CPU_IDLE -> nohlt 27 */ 28#include <linux/linkage.h> 29#include <linux/init.h> 30#include <asm/assembler.h> 31#include <asm/hwcap.h> 32#include <asm/pgtable-hwdef.h> 33#include <asm/pgtable.h> 34#include <asm/page.h> 35#include <asm/ptrace.h> 36#include "proc-macros.S" 37 38/* 39 * This is the maximum size of an area which will be invalidated 40 * using the single invalidate entry instructions. Anything larger 41 * than this, and we go for the whole cache. 42 * 43 * This value should be chosen such that we choose the cheapest 44 * alternative. 45 */ 46#define CACHE_DLIMIT 16384 47 48/* 49 * the cache line size of the I and D cache 50 */ 51#define CACHE_DLINESIZE 32 52 53 .text 54/* 55 * cpu_arm926_proc_init() 56 */ 57ENTRY(cpu_arm926_proc_init) 58 mov pc, lr 59 60/* 61 * cpu_arm926_proc_fin() 62 */ 63ENTRY(cpu_arm926_proc_fin) 64 mrc p15, 0, r0, c1, c0, 0 @ ctrl register 65 bic r0, r0, #0x1000 @ ...i............ 66 bic r0, r0, #0x000e @ ............wca. 67 mcr p15, 0, r0, c1, c0, 0 @ disable caches 68 mov pc, lr 69 70/* 71 * cpu_arm926_reset(loc) 72 * 73 * Perform a soft reset of the system. Put the CPU into the 74 * same state as it would be if it had been reset, and branch 75 * to what would be the reset vector. 76 * 77 * loc: location to jump to for soft reset 78 */ 79 .align 5 80 .pushsection .idmap.text, "ax" 81ENTRY(cpu_arm926_reset) 82 mov ip, #0 83 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches 84 mcr p15, 0, ip, c7, c10, 4 @ drain WB 85#ifdef CONFIG_MMU 86 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 87#endif 88 mrc p15, 0, ip, c1, c0, 0 @ ctrl register 89 bic ip, ip, #0x000f @ ............wcam 90 bic ip, ip, #0x1100 @ ...i...s........ 91 mcr p15, 0, ip, c1, c0, 0 @ ctrl register 92 mov pc, r0 93ENDPROC(cpu_arm926_reset) 94 .popsection 95 96/* 97 * cpu_arm926_do_idle() 98 * 99 * Called with IRQs disabled 100 */ 101 .align 10 102ENTRY(cpu_arm926_do_idle) 103 mov r0, #0 104 mrc p15, 0, r1, c1, c0, 0 @ Read control register 105 mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer 106 bic r2, r1, #1 << 12 107 mrs r3, cpsr @ Disable FIQs while Icache 108 orr ip, r3, #PSR_F_BIT @ is disabled 109 msr cpsr_c, ip 110 mcr p15, 0, r2, c1, c0, 0 @ Disable I cache 111 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt 112 mcr p15, 0, r1, c1, c0, 0 @ Restore ICache enable 113 msr cpsr_c, r3 @ Restore FIQ state 114 mov pc, lr 115 116/* 117 * flush_icache_all() 118 * 119 * Unconditionally clean and invalidate the entire icache. 120 */ 121ENTRY(arm926_flush_icache_all) 122 mov r0, #0 123 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache 124 mov pc, lr 125ENDPROC(arm926_flush_icache_all) 126 127/* 128 * flush_user_cache_all() 129 * 130 * Clean and invalidate all cache entries in a particular 131 * address space. 132 */ 133ENTRY(arm926_flush_user_cache_all) 134 /* FALLTHROUGH */ 135 136/* 137 * flush_kern_cache_all() 138 * 139 * Clean and invalidate the entire cache. 140 */ 141ENTRY(arm926_flush_kern_cache_all) 142 mov r2, #VM_EXEC 143 mov ip, #0 144__flush_whole_cache: 145#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH 146 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache 147#else 1481: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate 149 bne 1b 150#endif 151 tst r2, #VM_EXEC 152 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache 153 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 154 mov pc, lr 155 156/* 157 * flush_user_cache_range(start, end, flags) 158 * 159 * Clean and invalidate a range of cache entries in the 160 * specified address range. 161 * 162 * - start - start address (inclusive) 163 * - end - end address (exclusive) 164 * - flags - vm_flags describing address space 165 */ 166ENTRY(arm926_flush_user_cache_range) 167 mov ip, #0 168 sub r3, r1, r0 @ calculate total size 169 cmp r3, #CACHE_DLIMIT 170 bgt __flush_whole_cache 1711: tst r2, #VM_EXEC 172#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH 173 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry 174 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry 175 add r0, r0, #CACHE_DLINESIZE 176 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry 177 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry 178 add r0, r0, #CACHE_DLINESIZE 179#else 180 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry 181 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry 182 add r0, r0, #CACHE_DLINESIZE 183 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry 184 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry 185 add r0, r0, #CACHE_DLINESIZE 186#endif 187 cmp r0, r1 188 blo 1b 189 tst r2, #VM_EXEC 190 mcrne p15, 0, ip, c7, c10, 4 @ drain WB 191 mov pc, lr 192 193/* 194 * coherent_kern_range(start, end) 195 * 196 * Ensure coherency between the Icache and the Dcache in the 197 * region described by start, end. If you have non-snooping 198 * Harvard caches, you need to implement this function. 199 * 200 * - start - virtual start address 201 * - end - virtual end address 202 */ 203ENTRY(arm926_coherent_kern_range) 204 /* FALLTHROUGH */ 205 206/* 207 * coherent_user_range(start, end) 208 * 209 * Ensure coherency between the Icache and the Dcache in the 210 * region described by start, end. If you have non-snooping 211 * Harvard caches, you need to implement this function. 212 * 213 * - start - virtual start address 214 * - end - virtual end address 215 */ 216ENTRY(arm926_coherent_user_range) 217 bic r0, r0, #CACHE_DLINESIZE - 1 2181: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 219 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry 220 add r0, r0, #CACHE_DLINESIZE 221 cmp r0, r1 222 blo 1b 223 mcr p15, 0, r0, c7, c10, 4 @ drain WB 224 mov pc, lr 225 226/* 227 * flush_kern_dcache_area(void *addr, size_t size) 228 * 229 * Ensure no D cache aliasing occurs, either with itself or 230 * the I cache 231 * 232 * - addr - kernel address 233 * - size - region size 234 */ 235ENTRY(arm926_flush_kern_dcache_area) 236 add r1, r0, r1 2371: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 238 add r0, r0, #CACHE_DLINESIZE 239 cmp r0, r1 240 blo 1b 241 mov r0, #0 242 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache 243 mcr p15, 0, r0, c7, c10, 4 @ drain WB 244 mov pc, lr 245 246/* 247 * dma_inv_range(start, end) 248 * 249 * Invalidate (discard) the specified virtual address range. 250 * May not write back any entries. If 'start' or 'end' 251 * are not cache line aligned, those lines must be written 252 * back. 253 * 254 * - start - virtual start address 255 * - end - virtual end address 256 * 257 * (same as v4wb) 258 */ 259arm926_dma_inv_range: 260#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH 261 tst r0, #CACHE_DLINESIZE - 1 262 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry 263 tst r1, #CACHE_DLINESIZE - 1 264 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry 265#endif 266 bic r0, r0, #CACHE_DLINESIZE - 1 2671: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry 268 add r0, r0, #CACHE_DLINESIZE 269 cmp r0, r1 270 blo 1b 271 mcr p15, 0, r0, c7, c10, 4 @ drain WB 272 mov pc, lr 273 274/* 275 * dma_clean_range(start, end) 276 * 277 * Clean the specified virtual address range. 278 * 279 * - start - virtual start address 280 * - end - virtual end address 281 * 282 * (same as v4wb) 283 */ 284arm926_dma_clean_range: 285#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH 286 bic r0, r0, #CACHE_DLINESIZE - 1 2871: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 288 add r0, r0, #CACHE_DLINESIZE 289 cmp r0, r1 290 blo 1b 291#endif 292 mcr p15, 0, r0, c7, c10, 4 @ drain WB 293 mov pc, lr 294 295/* 296 * dma_flush_range(start, end) 297 * 298 * Clean and invalidate the specified virtual address range. 299 * 300 * - start - virtual start address 301 * - end - virtual end address 302 */ 303ENTRY(arm926_dma_flush_range) 304 bic r0, r0, #CACHE_DLINESIZE - 1 3051: 306#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH 307 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry 308#else 309 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry 310#endif 311 add r0, r0, #CACHE_DLINESIZE 312 cmp r0, r1 313 blo 1b 314 mcr p15, 0, r0, c7, c10, 4 @ drain WB 315 mov pc, lr 316 317/* 318 * dma_map_area(start, size, dir) 319 * - start - kernel virtual start address 320 * - size - size of region 321 * - dir - DMA direction 322 */ 323ENTRY(arm926_dma_map_area) 324 add r1, r1, r0 325 cmp r2, #DMA_TO_DEVICE 326 beq arm926_dma_clean_range 327 bcs arm926_dma_inv_range 328 b arm926_dma_flush_range 329ENDPROC(arm926_dma_map_area) 330 331/* 332 * dma_unmap_area(start, size, dir) 333 * - start - kernel virtual start address 334 * - size - size of region 335 * - dir - DMA direction 336 */ 337ENTRY(arm926_dma_unmap_area) 338 mov pc, lr 339ENDPROC(arm926_dma_unmap_area) 340 341 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S) 342 define_cache_functions arm926 343 344ENTRY(cpu_arm926_dcache_clean_area) 345#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH 3461: mcr p15, 0, r0, c7, c10, 1 @ clean D entry 347 add r0, r0, #CACHE_DLINESIZE 348 subs r1, r1, #CACHE_DLINESIZE 349 bhi 1b 350#endif 351 mcr p15, 0, r0, c7, c10, 4 @ drain WB 352 mov pc, lr 353 354/* =============================== PageTable ============================== */ 355 356/* 357 * cpu_arm926_switch_mm(pgd) 358 * 359 * Set the translation base pointer to be as described by pgd. 360 * 361 * pgd: new page tables 362 */ 363 .align 5 364ENTRY(cpu_arm926_switch_mm) 365#ifdef CONFIG_MMU 366 mov ip, #0 367#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH 368 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache 369#else 370@ && 'Clean & Invalidate whole DCache' 3711: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate 372 bne 1b 373#endif 374 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache 375 mcr p15, 0, ip, c7, c10, 4 @ drain WB 376 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer 377 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 378#endif 379 mov pc, lr 380 381/* 382 * cpu_arm926_set_pte_ext(ptep, pte, ext) 383 * 384 * Set a PTE and flush it out 385 */ 386 .align 5 387ENTRY(cpu_arm926_set_pte_ext) 388#ifdef CONFIG_MMU 389 armv3_set_pte_ext 390 mov r0, r0 391#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH 392 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 393#endif 394 mcr p15, 0, r0, c7, c10, 4 @ drain WB 395#endif 396 mov pc, lr 397 398/* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */ 399.globl cpu_arm926_suspend_size 400.equ cpu_arm926_suspend_size, 4 * 3 401#ifdef CONFIG_ARM_CPU_SUSPEND 402ENTRY(cpu_arm926_do_suspend) 403 stmfd sp!, {r4 - r6, lr} 404 mrc p15, 0, r4, c13, c0, 0 @ PID 405 mrc p15, 0, r5, c3, c0, 0 @ Domain ID 406 mrc p15, 0, r6, c1, c0, 0 @ Control register 407 stmia r0, {r4 - r6} 408 ldmfd sp!, {r4 - r6, pc} 409ENDPROC(cpu_arm926_do_suspend) 410 411ENTRY(cpu_arm926_do_resume) 412 mov ip, #0 413 mcr p15, 0, ip, c8, c7, 0 @ invalidate I+D TLBs 414 mcr p15, 0, ip, c7, c7, 0 @ invalidate I+D caches 415 ldmia r0, {r4 - r6} 416 mcr p15, 0, r4, c13, c0, 0 @ PID 417 mcr p15, 0, r5, c3, c0, 0 @ Domain ID 418 mcr p15, 0, r1, c2, c0, 0 @ TTB address 419 mov r0, r6 @ control register 420 b cpu_resume_mmu 421ENDPROC(cpu_arm926_do_resume) 422#endif 423 424 __CPUINIT 425 426 .type __arm926_setup, #function 427__arm926_setup: 428 mov r0, #0 429 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 430 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 431#ifdef CONFIG_MMU 432 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 433#endif 434 435 436#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH 437 mov r0, #4 @ disable write-back on caches explicitly 438 mcr p15, 7, r0, c15, c0, 0 439#endif 440 441 adr r5, arm926_crval 442 ldmia r5, {r5, r6} 443 mrc p15, 0, r0, c1, c0 @ get control register v4 444 bic r0, r0, r5 445 orr r0, r0, r6 446#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN 447 orr r0, r0, #0x4000 @ .1.. .... .... .... 448#endif 449 mov pc, lr 450 .size __arm926_setup, . - __arm926_setup 451 452 /* 453 * R 454 * .RVI ZFRS BLDP WCAM 455 * .011 0001 ..11 0101 456 * 457 */ 458 .type arm926_crval, #object 459arm926_crval: 460 crval clear=0x00007f3f, mmuset=0x00003135, ucset=0x00001134 461 462 __INITDATA 463 464 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) 465 define_processor_functions arm926, dabort=v5tj_early_abort, pabort=legacy_pabort, suspend=1 466 467 .section ".rodata" 468 469 string cpu_arch_name, "armv5tej" 470 string cpu_elf_name, "v5" 471 string cpu_arm926_name, "ARM926EJ-S" 472 473 .align 474 475 .section ".proc.info.init", #alloc, #execinstr 476 477 .type __arm926_proc_info,#object 478__arm926_proc_info: 479 .long 0x41069260 @ ARM926EJ-S (v5TEJ) 480 .long 0xff0ffff0 481 .long PMD_TYPE_SECT | \ 482 PMD_SECT_BUFFERABLE | \ 483 PMD_SECT_CACHEABLE | \ 484 PMD_BIT4 | \ 485 PMD_SECT_AP_WRITE | \ 486 PMD_SECT_AP_READ 487 .long PMD_TYPE_SECT | \ 488 PMD_BIT4 | \ 489 PMD_SECT_AP_WRITE | \ 490 PMD_SECT_AP_READ 491 b __arm926_setup 492 .long cpu_arch_name 493 .long cpu_elf_name 494 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA 495 .long cpu_arm926_name 496 .long arm926_processor_functions 497 .long v4wbi_tlb_fns 498 .long v4wb_user_fns 499 .long arm926_cache_fns 500 .size __arm926_proc_info, . - __arm926_proc_info 501