1/* 2 * linux/arch/arm/kernel/head.S 3 * 4 * Copyright (C) 1994-2002 Russell King 5 * Copyright (c) 2003 ARM Limited 6 * All Rights Reserved 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 version 2 as 10 * published by the Free Software Foundation. 11 * 12 * Kernel startup code for all 32-bit CPUs 13 */ 14#include <linux/linkage.h> 15#include <linux/init.h> 16 17#include <asm/assembler.h> 18#include <asm/cp15.h> 19#include <asm/domain.h> 20#include <asm/ptrace.h> 21#include <asm/asm-offsets.h> 22#include <asm/memory.h> 23#include <asm/thread_info.h> 24#include <asm/pgtable.h> 25 26#if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_SEMIHOSTING) 27#include CONFIG_DEBUG_LL_INCLUDE 28#endif 29 30/* 31 * swapper_pg_dir is the virtual address of the initial page table. 32 * We place the page tables 16K below KERNEL_RAM_VADDR. Therefore, we must 33 * make sure that KERNEL_RAM_VADDR is correctly set. Currently, we expect 34 * the least significant 16 bits to be 0x8000, but we could probably 35 * relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + 0x4000. 36 */ 37#define KERNEL_RAM_VADDR (PAGE_OFFSET + TEXT_OFFSET) 38#if (KERNEL_RAM_VADDR & 0xffff) != 0x8000 39#error KERNEL_RAM_VADDR must start at 0xXXXX8000 40#endif 41 42#ifdef CONFIG_ARM_LPAE 43 /* LPAE requires an additional page for the PGD */ 44#define PG_DIR_SIZE 0x5000 45#define PMD_ORDER 3 46#else 47#define PG_DIR_SIZE 0x4000 48#define PMD_ORDER 2 49#endif 50 51 .globl swapper_pg_dir 52 .equ swapper_pg_dir, KERNEL_RAM_VADDR - PG_DIR_SIZE 53 54 .macro pgtbl, rd, phys 55 add \rd, \phys, #TEXT_OFFSET - PG_DIR_SIZE 56 .endm 57 58/* 59 * Kernel startup entry point. 60 * --------------------------- 61 * 62 * This is normally called from the decompressor code. The requirements 63 * are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0, 64 * r1 = machine nr, r2 = atags or dtb pointer. 65 * 66 * This code is mostly position independent, so if you link the kernel at 67 * 0xc0008000, you call this at __pa(0xc0008000). 68 * 69 * See linux/arch/arm/tools/mach-types for the complete list of machine 70 * numbers for r1. 71 * 72 * We're trying to keep crap to a minimum; DO NOT add any machine specific 73 * crap here - that's what the boot loader (or in extreme, well justified 74 * circumstances, zImage) is for. 75 */ 76 .arm 77 78 __HEAD 79ENTRY(stext) 80 ARM_BE8(setend be ) @ ensure we are in BE8 mode 81 82 THUMB( adr r9, BSYM(1f) ) @ Kernel is always entered in ARM. 83 THUMB( bx r9 ) @ If this is a Thumb-2 kernel, 84 THUMB( .thumb ) @ switch to Thumb now. 85 THUMB(1: ) 86 87#ifdef CONFIG_ARM_VIRT_EXT 88 bl __hyp_stub_install 89#endif 90 @ ensure svc mode and all interrupts masked 91 safe_svcmode_maskall r9 92 93 mrc p15, 0, r9, c0, c0 @ get processor id 94 bl __lookup_processor_type @ r5=procinfo r9=cpuid 95 movs r10, r5 @ invalid processor (r5=0)? 96 THUMB( it eq ) @ force fixup-able long branch encoding 97 beq __error_p @ yes, error 'p' 98 99#ifdef CONFIG_ARM_LPAE 100 mrc p15, 0, r3, c0, c1, 4 @ read ID_MMFR0 101 and r3, r3, #0xf @ extract VMSA support 102 cmp r3, #5 @ long-descriptor translation table format? 103 THUMB( it lo ) @ force fixup-able long branch encoding 104 blo __error_p @ only classic page table format 105#endif 106 107#ifndef CONFIG_XIP_KERNEL 108 adr r3, 2f 109 ldmia r3, {r4, r8} 110 sub r4, r3, r4 @ (PHYS_OFFSET - PAGE_OFFSET) 111 add r8, r8, r4 @ PHYS_OFFSET 112#else 113 ldr r8, =PLAT_PHYS_OFFSET @ always constant in this case 114#endif 115 116 /* 117 * r1 = machine no, r2 = atags or dtb, 118 * r8 = phys_offset, r9 = cpuid, r10 = procinfo 119 */ 120 bl __vet_atags 121#ifdef CONFIG_SMP_ON_UP 122 bl __fixup_smp 123#endif 124#ifdef CONFIG_ARM_PATCH_PHYS_VIRT 125 bl __fixup_pv_table 126#endif 127 bl __create_page_tables 128 129 /* 130 * The following calls CPU specific code in a position independent 131 * manner. See arch/arm/mm/proc-*.S for details. r10 = base of 132 * xxx_proc_info structure selected by __lookup_processor_type 133 * above. On return, the CPU will be ready for the MMU to be 134 * turned on, and r0 will hold the CPU control register value. 135 */ 136 ldr r13, =__mmap_switched @ address to jump to after 137 @ mmu has been enabled 138 adr lr, BSYM(1f) @ return (PIC) address 139 mov r8, r4 @ set TTBR1 to swapper_pg_dir 140 ARM( add pc, r10, #PROCINFO_INITFUNC ) 141 THUMB( add r12, r10, #PROCINFO_INITFUNC ) 142 THUMB( mov pc, r12 ) 1431: b __enable_mmu 144ENDPROC(stext) 145 .ltorg 146#ifndef CONFIG_XIP_KERNEL 1472: .long . 148 .long PAGE_OFFSET 149#endif 150 151/* 152 * Setup the initial page tables. We only setup the barest 153 * amount which are required to get the kernel running, which 154 * generally means mapping in the kernel code. 155 * 156 * r8 = phys_offset, r9 = cpuid, r10 = procinfo 157 * 158 * Returns: 159 * r0, r3, r5-r7 corrupted 160 * r4 = page table (see ARCH_PGD_SHIFT in asm/memory.h) 161 */ 162__create_page_tables: 163 pgtbl r4, r8 @ page table address 164 165 /* 166 * Clear the swapper page table 167 */ 168 mov r0, r4 169 mov r3, #0 170 add r6, r0, #PG_DIR_SIZE 1711: str r3, [r0], #4 172 str r3, [r0], #4 173 str r3, [r0], #4 174 str r3, [r0], #4 175 teq r0, r6 176 bne 1b 177 178#ifdef CONFIG_ARM_LPAE 179 /* 180 * Build the PGD table (first level) to point to the PMD table. A PGD 181 * entry is 64-bit wide. 182 */ 183 mov r0, r4 184 add r3, r4, #0x1000 @ first PMD table address 185 orr r3, r3, #3 @ PGD block type 186 mov r6, #4 @ PTRS_PER_PGD 187 mov r7, #1 << (55 - 32) @ L_PGD_SWAPPER 1881: 189#ifdef CONFIG_CPU_ENDIAN_BE8 190 str r7, [r0], #4 @ set top PGD entry bits 191 str r3, [r0], #4 @ set bottom PGD entry bits 192#else 193 str r3, [r0], #4 @ set bottom PGD entry bits 194 str r7, [r0], #4 @ set top PGD entry bits 195#endif 196 add r3, r3, #0x1000 @ next PMD table 197 subs r6, r6, #1 198 bne 1b 199 200 add r4, r4, #0x1000 @ point to the PMD tables 201#ifdef CONFIG_CPU_ENDIAN_BE8 202 add r4, r4, #4 @ we only write the bottom word 203#endif 204#endif 205 206 ldr r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags 207 208 /* 209 * Create identity mapping to cater for __enable_mmu. 210 * This identity mapping will be removed by paging_init(). 211 */ 212 adr r0, __turn_mmu_on_loc 213 ldmia r0, {r3, r5, r6} 214 sub r0, r0, r3 @ virt->phys offset 215 add r5, r5, r0 @ phys __turn_mmu_on 216 add r6, r6, r0 @ phys __turn_mmu_on_end 217 mov r5, r5, lsr #SECTION_SHIFT 218 mov r6, r6, lsr #SECTION_SHIFT 219 2201: orr r3, r7, r5, lsl #SECTION_SHIFT @ flags + kernel base 221 str r3, [r4, r5, lsl #PMD_ORDER] @ identity mapping 222 cmp r5, r6 223 addlo r5, r5, #1 @ next section 224 blo 1b 225 226 /* 227 * Map our RAM from the start to the end of the kernel .bss section. 228 */ 229 add r0, r4, #PAGE_OFFSET >> (SECTION_SHIFT - PMD_ORDER) 230 ldr r6, =(_end - 1) 231 orr r3, r8, r7 232 add r6, r4, r6, lsr #(SECTION_SHIFT - PMD_ORDER) 2331: str r3, [r0], #1 << PMD_ORDER 234 add r3, r3, #1 << SECTION_SHIFT 235 cmp r0, r6 236 bls 1b 237 238#ifdef CONFIG_XIP_KERNEL 239 /* 240 * Map the kernel image separately as it is not located in RAM. 241 */ 242#define XIP_START XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) 243 mov r3, pc 244 mov r3, r3, lsr #SECTION_SHIFT 245 orr r3, r7, r3, lsl #SECTION_SHIFT 246 add r0, r4, #(XIP_START & 0xff000000) >> (SECTION_SHIFT - PMD_ORDER) 247 str r3, [r0, #((XIP_START & 0x00f00000) >> SECTION_SHIFT) << PMD_ORDER]! 248 ldr r6, =(_edata_loc - 1) 249 add r0, r0, #1 << PMD_ORDER 250 add r6, r4, r6, lsr #(SECTION_SHIFT - PMD_ORDER) 2511: cmp r0, r6 252 add r3, r3, #1 << SECTION_SHIFT 253 strls r3, [r0], #1 << PMD_ORDER 254 bls 1b 255#endif 256 257 /* 258 * Then map boot params address in r2 if specified. 259 * We map 2 sections in case the ATAGs/DTB crosses a section boundary. 260 */ 261 mov r0, r2, lsr #SECTION_SHIFT 262 movs r0, r0, lsl #SECTION_SHIFT 263 subne r3, r0, r8 264 addne r3, r3, #PAGE_OFFSET 265 addne r3, r4, r3, lsr #(SECTION_SHIFT - PMD_ORDER) 266 orrne r6, r7, r0 267 strne r6, [r3], #1 << PMD_ORDER 268 addne r6, r6, #1 << SECTION_SHIFT 269 strne r6, [r3] 270 271#if defined(CONFIG_ARM_LPAE) && defined(CONFIG_CPU_ENDIAN_BE8) 272 sub r4, r4, #4 @ Fixup page table pointer 273 @ for 64-bit descriptors 274#endif 275 276#ifdef CONFIG_DEBUG_LL 277#if !defined(CONFIG_DEBUG_ICEDCC) && !defined(CONFIG_DEBUG_SEMIHOSTING) 278 /* 279 * Map in IO space for serial debugging. 280 * This allows debug messages to be output 281 * via a serial console before paging_init. 282 */ 283 addruart r7, r3, r0 284 285 mov r3, r3, lsr #SECTION_SHIFT 286 mov r3, r3, lsl #PMD_ORDER 287 288 add r0, r4, r3 289 mov r3, r7, lsr #SECTION_SHIFT 290 ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags 291 orr r3, r7, r3, lsl #SECTION_SHIFT 292#ifdef CONFIG_ARM_LPAE 293 mov r7, #1 << (54 - 32) @ XN 294#ifdef CONFIG_CPU_ENDIAN_BE8 295 str r7, [r0], #4 296 str r3, [r0], #4 297#else 298 str r3, [r0], #4 299 str r7, [r0], #4 300#endif 301#else 302 orr r3, r3, #PMD_SECT_XN 303 str r3, [r0], #4 304#endif 305 306#else /* CONFIG_DEBUG_ICEDCC || CONFIG_DEBUG_SEMIHOSTING */ 307 /* we don't need any serial debugging mappings */ 308 ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags 309#endif 310 311#if defined(CONFIG_ARCH_NETWINDER) || defined(CONFIG_ARCH_CATS) 312 /* 313 * If we're using the NetWinder or CATS, we also need to map 314 * in the 16550-type serial port for the debug messages 315 */ 316 add r0, r4, #0xff000000 >> (SECTION_SHIFT - PMD_ORDER) 317 orr r3, r7, #0x7c000000 318 str r3, [r0] 319#endif 320#ifdef CONFIG_ARCH_RPC 321 /* 322 * Map in screen at 0x02000000 & SCREEN2_BASE 323 * Similar reasons here - for debug. This is 324 * only for Acorn RiscPC architectures. 325 */ 326 add r0, r4, #0x02000000 >> (SECTION_SHIFT - PMD_ORDER) 327 orr r3, r7, #0x02000000 328 str r3, [r0] 329 add r0, r4, #0xd8000000 >> (SECTION_SHIFT - PMD_ORDER) 330 str r3, [r0] 331#endif 332#endif 333#ifdef CONFIG_ARM_LPAE 334 sub r4, r4, #0x1000 @ point to the PGD table 335 mov r4, r4, lsr #ARCH_PGD_SHIFT 336#endif 337 mov pc, lr 338ENDPROC(__create_page_tables) 339 .ltorg 340 .align 341__turn_mmu_on_loc: 342 .long . 343 .long __turn_mmu_on 344 .long __turn_mmu_on_end 345 346#if defined(CONFIG_SMP) 347 .text 348ENTRY(secondary_startup) 349 /* 350 * Common entry point for secondary CPUs. 351 * 352 * Ensure that we're in SVC mode, and IRQs are disabled. Lookup 353 * the processor type - there is no need to check the machine type 354 * as it has already been validated by the primary processor. 355 */ 356 357 ARM_BE8(setend be) @ ensure we are in BE8 mode 358 359#ifdef CONFIG_ARM_VIRT_EXT 360 bl __hyp_stub_install_secondary 361#endif 362 safe_svcmode_maskall r9 363 364 mrc p15, 0, r9, c0, c0 @ get processor id 365 bl __lookup_processor_type 366 movs r10, r5 @ invalid processor? 367 moveq r0, #'p' @ yes, error 'p' 368 THUMB( it eq ) @ force fixup-able long branch encoding 369 beq __error_p 370 371 /* 372 * Use the page tables supplied from __cpu_up. 373 */ 374 adr r4, __secondary_data 375 ldmia r4, {r5, r7, r12} @ address to jump to after 376 sub lr, r4, r5 @ mmu has been enabled 377 ldr r4, [r7, lr] @ get secondary_data.pgdir 378 add r7, r7, #4 379 ldr r8, [r7, lr] @ get secondary_data.swapper_pg_dir 380 adr lr, BSYM(__enable_mmu) @ return address 381 mov r13, r12 @ __secondary_switched address 382 ARM( add pc, r10, #PROCINFO_INITFUNC ) @ initialise processor 383 @ (return control reg) 384 THUMB( add r12, r10, #PROCINFO_INITFUNC ) 385 THUMB( mov pc, r12 ) 386ENDPROC(secondary_startup) 387 388 /* 389 * r6 = &secondary_data 390 */ 391ENTRY(__secondary_switched) 392 ldr sp, [r7, #4] @ get secondary_data.stack 393 mov fp, #0 394 b secondary_start_kernel 395ENDPROC(__secondary_switched) 396 397 .align 398 399 .type __secondary_data, %object 400__secondary_data: 401 .long . 402 .long secondary_data 403 .long __secondary_switched 404#endif /* defined(CONFIG_SMP) */ 405 406 407 408/* 409 * Setup common bits before finally enabling the MMU. Essentially 410 * this is just loading the page table pointer and domain access 411 * registers. 412 * 413 * r0 = cp#15 control register 414 * r1 = machine ID 415 * r2 = atags or dtb pointer 416 * r4 = page table (see ARCH_PGD_SHIFT in asm/memory.h) 417 * r9 = processor ID 418 * r13 = *virtual* address to jump to upon completion 419 */ 420__enable_mmu: 421#if defined(CONFIG_ALIGNMENT_TRAP) && __LINUX_ARM_ARCH__ < 6 422 orr r0, r0, #CR_A 423#else 424 bic r0, r0, #CR_A 425#endif 426#ifdef CONFIG_CPU_DCACHE_DISABLE 427 bic r0, r0, #CR_C 428#endif 429#ifdef CONFIG_CPU_BPREDICT_DISABLE 430 bic r0, r0, #CR_Z 431#endif 432#ifdef CONFIG_CPU_ICACHE_DISABLE 433 bic r0, r0, #CR_I 434#endif 435#ifndef CONFIG_ARM_LPAE 436 mov r5, #(domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ 437 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ 438 domain_val(DOMAIN_TABLE, DOMAIN_MANAGER) | \ 439 domain_val(DOMAIN_IO, DOMAIN_CLIENT)) 440 mcr p15, 0, r5, c3, c0, 0 @ load domain access register 441 mcr p15, 0, r4, c2, c0, 0 @ load page table pointer 442#endif 443 b __turn_mmu_on 444ENDPROC(__enable_mmu) 445 446/* 447 * Enable the MMU. This completely changes the structure of the visible 448 * memory space. You will not be able to trace execution through this. 449 * If you have an enquiry about this, *please* check the linux-arm-kernel 450 * mailing list archives BEFORE sending another post to the list. 451 * 452 * r0 = cp#15 control register 453 * r1 = machine ID 454 * r2 = atags or dtb pointer 455 * r9 = processor ID 456 * r13 = *virtual* address to jump to upon completion 457 * 458 * other registers depend on the function called upon completion 459 */ 460 .align 5 461 .pushsection .idmap.text, "ax" 462ENTRY(__turn_mmu_on) 463 mov r0, r0 464 instr_sync 465 mcr p15, 0, r0, c1, c0, 0 @ write control reg 466 mrc p15, 0, r3, c0, c0, 0 @ read id reg 467 instr_sync 468 mov r3, r3 469 mov r3, r13 470 mov pc, r3 471__turn_mmu_on_end: 472ENDPROC(__turn_mmu_on) 473 .popsection 474 475 476#ifdef CONFIG_SMP_ON_UP 477 __INIT 478__fixup_smp: 479 and r3, r9, #0x000f0000 @ architecture version 480 teq r3, #0x000f0000 @ CPU ID supported? 481 bne __fixup_smp_on_up @ no, assume UP 482 483 bic r3, r9, #0x00ff0000 484 bic r3, r3, #0x0000000f @ mask 0xff00fff0 485 mov r4, #0x41000000 486 orr r4, r4, #0x0000b000 487 orr r4, r4, #0x00000020 @ val 0x4100b020 488 teq r3, r4 @ ARM 11MPCore? 489 moveq pc, lr @ yes, assume SMP 490 491 mrc p15, 0, r0, c0, c0, 5 @ read MPIDR 492 and r0, r0, #0xc0000000 @ multiprocessing extensions and 493 teq r0, #0x80000000 @ not part of a uniprocessor system? 494 bne __fixup_smp_on_up @ no, assume UP 495 496 @ Core indicates it is SMP. Check for Aegis SOC where a single 497 @ Cortex-A9 CPU is present but SMP operations fault. 498 mov r4, #0x41000000 499 orr r4, r4, #0x0000c000 500 orr r4, r4, #0x00000090 501 teq r3, r4 @ Check for ARM Cortex-A9 502 movne pc, lr @ Not ARM Cortex-A9, 503 504 @ If a future SoC *does* use 0x0 as the PERIPH_BASE, then the 505 @ below address check will need to be #ifdef'd or equivalent 506 @ for the Aegis platform. 507 mrc p15, 4, r0, c15, c0 @ get SCU base address 508 teq r0, #0x0 @ '0' on actual UP A9 hardware 509 beq __fixup_smp_on_up @ So its an A9 UP 510 ldr r0, [r0, #4] @ read SCU Config 511ARM_BE8(rev r0, r0) @ byteswap if big endian 512 and r0, r0, #0x3 @ number of CPUs 513 teq r0, #0x0 @ is 1? 514 movne pc, lr 515 516__fixup_smp_on_up: 517 adr r0, 1f 518 ldmia r0, {r3 - r5} 519 sub r3, r0, r3 520 add r4, r4, r3 521 add r5, r5, r3 522 b __do_fixup_smp_on_up 523ENDPROC(__fixup_smp) 524 525 .align 5261: .word . 527 .word __smpalt_begin 528 .word __smpalt_end 529 530 .pushsection .data 531 .globl smp_on_up 532smp_on_up: 533 ALT_SMP(.long 1) 534 ALT_UP(.long 0) 535 .popsection 536#endif 537 538 .text 539__do_fixup_smp_on_up: 540 cmp r4, r5 541 movhs pc, lr 542 ldmia r4!, {r0, r6} 543 ARM( str r6, [r0, r3] ) 544 THUMB( add r0, r0, r3 ) 545#ifdef __ARMEB__ 546 THUMB( mov r6, r6, ror #16 ) @ Convert word order for big-endian. 547#endif 548 THUMB( strh r6, [r0], #2 ) @ For Thumb-2, store as two halfwords 549 THUMB( mov r6, r6, lsr #16 ) @ to be robust against misaligned r3. 550 THUMB( strh r6, [r0] ) 551 b __do_fixup_smp_on_up 552ENDPROC(__do_fixup_smp_on_up) 553 554ENTRY(fixup_smp) 555 stmfd sp!, {r4 - r6, lr} 556 mov r4, r0 557 add r5, r0, r1 558 mov r3, #0 559 bl __do_fixup_smp_on_up 560 ldmfd sp!, {r4 - r6, pc} 561ENDPROC(fixup_smp) 562 563#ifdef __ARMEB__ 564#define LOW_OFFSET 0x4 565#define HIGH_OFFSET 0x0 566#else 567#define LOW_OFFSET 0x0 568#define HIGH_OFFSET 0x4 569#endif 570 571#ifdef CONFIG_ARM_PATCH_PHYS_VIRT 572 573/* __fixup_pv_table - patch the stub instructions with the delta between 574 * PHYS_OFFSET and PAGE_OFFSET, which is assumed to be 16MiB aligned and 575 * can be expressed by an immediate shifter operand. The stub instruction 576 * has a form of '(add|sub) rd, rn, #imm'. 577 */ 578 __HEAD 579__fixup_pv_table: 580 adr r0, 1f 581 ldmia r0, {r3-r7} 582 mvn ip, #0 583 subs r3, r0, r3 @ PHYS_OFFSET - PAGE_OFFSET 584 add r4, r4, r3 @ adjust table start address 585 add r5, r5, r3 @ adjust table end address 586 add r6, r6, r3 @ adjust __pv_phys_offset address 587 add r7, r7, r3 @ adjust __pv_offset address 588 str r8, [r6, #LOW_OFFSET] @ save computed PHYS_OFFSET to __pv_phys_offset 589 strcc ip, [r7, #HIGH_OFFSET] @ save to __pv_offset high bits 590 mov r6, r3, lsr #24 @ constant for add/sub instructions 591 teq r3, r6, lsl #24 @ must be 16MiB aligned 592THUMB( it ne @ cross section branch ) 593 bne __error 594 str r3, [r7, #LOW_OFFSET] @ save to __pv_offset low bits 595 b __fixup_a_pv_table 596ENDPROC(__fixup_pv_table) 597 598 .align 5991: .long . 600 .long __pv_table_begin 601 .long __pv_table_end 6022: .long __pv_phys_offset 603 .long __pv_offset 604 605 .text 606__fixup_a_pv_table: 607 adr r0, 3f 608 ldr r6, [r0] 609 add r6, r6, r3 610 ldr r0, [r6, #HIGH_OFFSET] @ pv_offset high word 611 ldr r6, [r6, #LOW_OFFSET] @ pv_offset low word 612 mov r6, r6, lsr #24 613 cmn r0, #1 614#ifdef CONFIG_THUMB2_KERNEL 615 moveq r0, #0x200000 @ set bit 21, mov to mvn instruction 616 lsls r6, #24 617 beq 2f 618 clz r7, r6 619 lsr r6, #24 620 lsl r6, r7 621 bic r6, #0x0080 622 lsrs r7, #1 623 orrcs r6, #0x0080 624 orr r6, r6, r7, lsl #12 625 orr r6, #0x4000 626 b 2f 6271: add r7, r3 628 ldrh ip, [r7, #2] 629ARM_BE8(rev16 ip, ip) 630 tst ip, #0x4000 631 and ip, #0x8f00 632 orrne ip, r6 @ mask in offset bits 31-24 633 orreq ip, r0 @ mask in offset bits 7-0 634ARM_BE8(rev16 ip, ip) 635 strh ip, [r7, #2] 636 bne 2f 637 ldrh ip, [r7] 638ARM_BE8(rev16 ip, ip) 639 bic ip, #0x20 640 orr ip, ip, r0, lsr #16 641ARM_BE8(rev16 ip, ip) 642 strh ip, [r7] 6432: cmp r4, r5 644 ldrcc r7, [r4], #4 @ use branch for delay slot 645 bcc 1b 646 bx lr 647#else 648#ifdef CONFIG_CPU_ENDIAN_BE8 649 moveq r0, #0x00004000 @ set bit 22, mov to mvn instruction 650#else 651 moveq r0, #0x400000 @ set bit 22, mov to mvn instruction 652#endif 653 b 2f 6541: ldr ip, [r7, r3] 655#ifdef CONFIG_CPU_ENDIAN_BE8 656 @ in BE8, we load data in BE, but instructions still in LE 657 bic ip, ip, #0xff000000 658 tst ip, #0x000f0000 @ check the rotation field 659 orrne ip, ip, r6, lsl #24 @ mask in offset bits 31-24 660 biceq ip, ip, #0x00004000 @ clear bit 22 661 orreq ip, ip, r0 @ mask in offset bits 7-0 662#else 663 bic ip, ip, #0x000000ff 664 tst ip, #0xf00 @ check the rotation field 665 orrne ip, ip, r6 @ mask in offset bits 31-24 666 biceq ip, ip, #0x400000 @ clear bit 22 667 orreq ip, ip, r0 @ mask in offset bits 7-0 668#endif 669 str ip, [r7, r3] 6702: cmp r4, r5 671 ldrcc r7, [r4], #4 @ use branch for delay slot 672 bcc 1b 673 mov pc, lr 674#endif 675ENDPROC(__fixup_a_pv_table) 676 677 .align 6783: .long __pv_offset 679 680ENTRY(fixup_pv_table) 681 stmfd sp!, {r4 - r7, lr} 682 mov r3, #0 @ no offset 683 mov r4, r0 @ r0 = table start 684 add r5, r0, r1 @ r1 = table size 685 bl __fixup_a_pv_table 686 ldmfd sp!, {r4 - r7, pc} 687ENDPROC(fixup_pv_table) 688 689 .data 690 .globl __pv_phys_offset 691 .type __pv_phys_offset, %object 692__pv_phys_offset: 693 .quad 0 694 .size __pv_phys_offset, . -__pv_phys_offset 695 696 .globl __pv_offset 697 .type __pv_offset, %object 698__pv_offset: 699 .quad 0 700 .size __pv_offset, . -__pv_offset 701#endif 702 703#include "head-common.S" 704