| /* |
| * linux/arch/arm/mm/proc-arm1026.S: MMU functions for ARM1026EJ-S |
| * |
| * Copyright (C) 2000 ARM Limited |
| * Copyright (C) 2000 Deep Blue Solutions Ltd. |
| * hacked for non-paged-MM by Hyok S. Choi, 2003. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * |
| * These are the low level assembler for performing cache and TLB |
| * functions on the ARM1026EJ-S. |
| */ |
| #include <linux/linkage.h> |
| #include <linux/init.h> |
| #include <asm/assembler.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/hwcap.h> |
| #include <asm/pgtable-hwdef.h> |
| #include <asm/pgtable.h> |
| #include <asm/ptrace.h> |
| |
| #include "proc-macros.S" |
| |
| /* |
| * This is the maximum size of an area which will be invalidated |
| * using the single invalidate entry instructions. Anything larger |
| * than this, and we go for the whole cache. |
| * |
| * This value should be chosen such that we choose the cheapest |
| * alternative. |
| */ |
| #define MAX_AREA_SIZE 32768 |
| |
| /* |
| * The size of one data cache line. |
| */ |
| #define CACHE_DLINESIZE 32 |
| |
| /* |
| * The number of data cache segments. |
| */ |
| #define CACHE_DSEGMENTS 16 |
| |
| /* |
| * The number of lines in a cache segment. |
| */ |
| #define CACHE_DENTRIES 64 |
| |
| /* |
| * This is the size at which it becomes more efficient to |
| * clean the whole cache, rather than using the individual |
| * cache line maintainence instructions. |
| */ |
| #define CACHE_DLIMIT 32768 |
| |
| .text |
| /* |
| * cpu_arm1026_proc_init() |
| */ |
| ENTRY(cpu_arm1026_proc_init) |
| mov pc, lr |
| |
| /* |
| * cpu_arm1026_proc_fin() |
| */ |
| ENTRY(cpu_arm1026_proc_fin) |
| stmfd sp!, {lr} |
| mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE |
| msr cpsr_c, ip |
| bl arm1026_flush_kern_cache_all |
| mrc p15, 0, r0, c1, c0, 0 @ ctrl register |
| bic r0, r0, #0x1000 @ ...i............ |
| bic r0, r0, #0x000e @ ............wca. |
| mcr p15, 0, r0, c1, c0, 0 @ disable caches |
| ldmfd sp!, {pc} |
| |
| /* |
| * cpu_arm1026_reset(loc) |
| * |
| * Perform a soft reset of the system. Put the CPU into the |
| * same state as it would be if it had been reset, and branch |
| * to what would be the reset vector. |
| * |
| * loc: location to jump to for soft reset |
| */ |
| .align 5 |
| ENTRY(cpu_arm1026_reset) |
| mov ip, #0 |
| mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches |
| mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| #ifdef CONFIG_MMU |
| mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs |
| #endif |
| mrc p15, 0, ip, c1, c0, 0 @ ctrl register |
| bic ip, ip, #0x000f @ ............wcam |
| bic ip, ip, #0x1100 @ ...i...s........ |
| mcr p15, 0, ip, c1, c0, 0 @ ctrl register |
| mov pc, r0 |
| |
| /* |
| * cpu_arm1026_do_idle() |
| */ |
| .align 5 |
| ENTRY(cpu_arm1026_do_idle) |
| mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt |
| mov pc, lr |
| |
| /* ================================= CACHE ================================ */ |
| |
| .align 5 |
| /* |
| * flush_user_cache_all() |
| * |
| * Invalidate all cache entries in a particular address |
| * space. |
| */ |
| ENTRY(arm1026_flush_user_cache_all) |
| /* FALLTHROUGH */ |
| /* |
| * flush_kern_cache_all() |
| * |
| * Clean and invalidate the entire cache. |
| */ |
| ENTRY(arm1026_flush_kern_cache_all) |
| mov r2, #VM_EXEC |
| mov ip, #0 |
| __flush_whole_cache: |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| 1: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate |
| bne 1b |
| #endif |
| tst r2, #VM_EXEC |
| #ifndef CONFIG_CPU_ICACHE_DISABLE |
| mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache |
| #endif |
| mcrne p15, 0, ip, c7, c10, 4 @ drain WB |
| mov pc, lr |
| |
| /* |
| * flush_user_cache_range(start, end, flags) |
| * |
| * Invalidate a range of cache entries in the specified |
| * address space. |
| * |
| * - start - start address (inclusive) |
| * - end - end address (exclusive) |
| * - flags - vm_flags for this space |
| */ |
| ENTRY(arm1026_flush_user_cache_range) |
| mov ip, #0 |
| sub r3, r1, r0 @ calculate total size |
| cmp r3, #CACHE_DLIMIT |
| bhs __flush_whole_cache |
| |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry |
| add r0, r0, #CACHE_DLINESIZE |
| cmp r0, r1 |
| blo 1b |
| #endif |
| tst r2, #VM_EXEC |
| #ifndef CONFIG_CPU_ICACHE_DISABLE |
| mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache |
| #endif |
| mcrne p15, 0, ip, c7, c10, 4 @ drain WB |
| mov pc, lr |
| |
| /* |
| * coherent_kern_range(start, end) |
| * |
| * Ensure coherency between the Icache and the Dcache in the |
| * region described by start. If you have non-snooping |
| * Harvard caches, you need to implement this function. |
| * |
| * - start - virtual start address |
| * - end - virtual end address |
| */ |
| ENTRY(arm1026_coherent_kern_range) |
| /* FALLTHROUGH */ |
| /* |
| * coherent_user_range(start, end) |
| * |
| * Ensure coherency between the Icache and the Dcache in the |
| * region described by start. If you have non-snooping |
| * Harvard caches, you need to implement this function. |
| * |
| * - start - virtual start address |
| * - end - virtual end address |
| */ |
| ENTRY(arm1026_coherent_user_range) |
| mov ip, #0 |
| bic r0, r0, #CACHE_DLINESIZE - 1 |
| 1: |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| #endif |
| #ifndef CONFIG_CPU_ICACHE_DISABLE |
| mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry |
| #endif |
| add r0, r0, #CACHE_DLINESIZE |
| cmp r0, r1 |
| blo 1b |
| mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| mov pc, lr |
| |
| /* |
| * flush_kern_dcache_area(void *addr, size_t size) |
| * |
| * Ensure no D cache aliasing occurs, either with itself or |
| * the I cache |
| * |
| * - addr - kernel address |
| * - size - region size |
| */ |
| ENTRY(arm1026_flush_kern_dcache_area) |
| mov ip, #0 |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| add r1, r0, r1 |
| 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry |
| add r0, r0, #CACHE_DLINESIZE |
| cmp r0, r1 |
| blo 1b |
| #endif |
| mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| mov pc, lr |
| |
| /* |
| * dma_inv_range(start, end) |
| * |
| * Invalidate (discard) the specified virtual address range. |
| * May not write back any entries. If 'start' or 'end' |
| * are not cache line aligned, those lines must be written |
| * back. |
| * |
| * - start - virtual start address |
| * - end - virtual end address |
| * |
| * (same as v4wb) |
| */ |
| ENTRY(arm1026_dma_inv_range) |
| mov ip, #0 |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| tst r0, #CACHE_DLINESIZE - 1 |
| bic r0, r0, #CACHE_DLINESIZE - 1 |
| mcrne p15, 0, r0, c7, c10, 1 @ clean D entry |
| tst r1, #CACHE_DLINESIZE - 1 |
| mcrne p15, 0, r1, c7, c10, 1 @ clean D entry |
| 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry |
| add r0, r0, #CACHE_DLINESIZE |
| cmp r0, r1 |
| blo 1b |
| #endif |
| mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| mov pc, lr |
| |
| /* |
| * dma_clean_range(start, end) |
| * |
| * Clean the specified virtual address range. |
| * |
| * - start - virtual start address |
| * - end - virtual end address |
| * |
| * (same as v4wb) |
| */ |
| ENTRY(arm1026_dma_clean_range) |
| mov ip, #0 |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| bic r0, r0, #CACHE_DLINESIZE - 1 |
| 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| add r0, r0, #CACHE_DLINESIZE |
| cmp r0, r1 |
| blo 1b |
| #endif |
| mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| mov pc, lr |
| |
| /* |
| * dma_flush_range(start, end) |
| * |
| * Clean and invalidate the specified virtual address range. |
| * |
| * - start - virtual start address |
| * - end - virtual end address |
| */ |
| ENTRY(arm1026_dma_flush_range) |
| mov ip, #0 |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| bic r0, r0, #CACHE_DLINESIZE - 1 |
| 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry |
| add r0, r0, #CACHE_DLINESIZE |
| cmp r0, r1 |
| blo 1b |
| #endif |
| mcr p15, 0, ip, c7, c10, 4 @ drain WB |
| mov pc, lr |
| |
| /* |
| * dma_map_area(start, size, dir) |
| * - start - kernel virtual start address |
| * - size - size of region |
| * - dir - DMA direction |
| */ |
| ENTRY(arm1026_dma_map_area) |
| add r1, r1, r0 |
| cmp r2, #DMA_TO_DEVICE |
| beq arm1026_dma_clean_range |
| bcs arm1026_dma_inv_range |
| b arm1026_dma_flush_range |
| ENDPROC(arm1026_dma_map_area) |
| |
| /* |
| * dma_unmap_area(start, size, dir) |
| * - start - kernel virtual start address |
| * - size - size of region |
| * - dir - DMA direction |
| */ |
| ENTRY(arm1026_dma_unmap_area) |
| mov pc, lr |
| ENDPROC(arm1026_dma_unmap_area) |
| |
| ENTRY(arm1026_cache_fns) |
| .long arm1026_flush_kern_cache_all |
| .long arm1026_flush_user_cache_all |
| .long arm1026_flush_user_cache_range |
| .long arm1026_coherent_kern_range |
| .long arm1026_coherent_user_range |
| .long arm1026_flush_kern_dcache_area |
| .long arm1026_dma_map_area |
| .long arm1026_dma_unmap_area |
| .long arm1026_dma_inv_range |
| .long arm1026_dma_clean_range |
| .long arm1026_dma_flush_range |
| |
| .align 5 |
| ENTRY(cpu_arm1026_dcache_clean_area) |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| mov ip, #0 |
| 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| add r0, r0, #CACHE_DLINESIZE |
| subs r1, r1, #CACHE_DLINESIZE |
| bhi 1b |
| #endif |
| mov pc, lr |
| |
| /* =============================== PageTable ============================== */ |
| |
| /* |
| * cpu_arm1026_switch_mm(pgd) |
| * |
| * Set the translation base pointer to be as described by pgd. |
| * |
| * pgd: new page tables |
| */ |
| .align 5 |
| ENTRY(cpu_arm1026_switch_mm) |
| #ifdef CONFIG_MMU |
| mov r1, #0 |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| 1: mrc p15, 0, r15, c7, c14, 3 @ test, clean, invalidate |
| bne 1b |
| #endif |
| #ifndef CONFIG_CPU_ICACHE_DISABLE |
| mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache |
| #endif |
| mcr p15, 0, r1, c7, c10, 4 @ drain WB |
| mcr p15, 0, r0, c2, c0, 0 @ load page table pointer |
| mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs |
| #endif |
| mov pc, lr |
| |
| /* |
| * cpu_arm1026_set_pte_ext(ptep, pte, ext) |
| * |
| * Set a PTE and flush it out |
| */ |
| .align 5 |
| ENTRY(cpu_arm1026_set_pte_ext) |
| #ifdef CONFIG_MMU |
| armv3_set_pte_ext |
| mov r0, r0 |
| #ifndef CONFIG_CPU_DCACHE_DISABLE |
| mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
| #endif |
| #endif /* CONFIG_MMU */ |
| mov pc, lr |
| |
| |
| __INIT |
| |
| .type __arm1026_setup, #function |
| __arm1026_setup: |
| mov r0, #0 |
| mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 |
| mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 |
| #ifdef CONFIG_MMU |
| mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 |
| mcr p15, 0, r4, c2, c0 @ load page table pointer |
| #endif |
| #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
| mov r0, #4 @ explicitly disable writeback |
| mcr p15, 7, r0, c15, c0, 0 |
| #endif |
| adr r5, arm1026_crval |
| ldmia r5, {r5, r6} |
| mrc p15, 0, r0, c1, c0 @ get control register v4 |
| bic r0, r0, r5 |
| orr r0, r0, r6 |
| #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN |
| orr r0, r0, #0x4000 @ .R.. .... .... .... |
| #endif |
| mov pc, lr |
| .size __arm1026_setup, . - __arm1026_setup |
| |
| /* |
| * R |
| * .RVI ZFRS BLDP WCAM |
| * .011 1001 ..11 0101 |
| * |
| */ |
| .type arm1026_crval, #object |
| arm1026_crval: |
| crval clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001934 |
| |
| __INITDATA |
| |
| /* |
| * Purpose : Function pointers used to access above functions - all calls |
| * come through these |
| */ |
| .type arm1026_processor_functions, #object |
| arm1026_processor_functions: |
| .word v5t_early_abort |
| .word legacy_pabort |
| .word cpu_arm1026_proc_init |
| .word cpu_arm1026_proc_fin |
| .word cpu_arm1026_reset |
| .word cpu_arm1026_do_idle |
| .word cpu_arm1026_dcache_clean_area |
| .word cpu_arm1026_switch_mm |
| .word cpu_arm1026_set_pte_ext |
| .size arm1026_processor_functions, . - arm1026_processor_functions |
| |
| .section .rodata |
| |
| .type cpu_arch_name, #object |
| cpu_arch_name: |
| .asciz "armv5tej" |
| .size cpu_arch_name, . - cpu_arch_name |
| |
| .type cpu_elf_name, #object |
| cpu_elf_name: |
| .asciz "v5" |
| .size cpu_elf_name, . - cpu_elf_name |
| .align |
| |
| .type cpu_arm1026_name, #object |
| cpu_arm1026_name: |
| .asciz "ARM1026EJ-S" |
| .size cpu_arm1026_name, . - cpu_arm1026_name |
| |
| .align |
| |
| .section ".proc.info.init", #alloc, #execinstr |
| |
| .type __arm1026_proc_info,#object |
| __arm1026_proc_info: |
| .long 0x4106a260 @ ARM 1026EJ-S (v5TEJ) |
| .long 0xff0ffff0 |
| .long PMD_TYPE_SECT | \ |
| PMD_BIT4 | \ |
| PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ |
| .long PMD_TYPE_SECT | \ |
| PMD_BIT4 | \ |
| PMD_SECT_AP_WRITE | \ |
| PMD_SECT_AP_READ |
| b __arm1026_setup |
| .long cpu_arch_name |
| .long cpu_elf_name |
| .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA |
| .long cpu_arm1026_name |
| .long arm1026_processor_functions |
| .long v4wbi_tlb_fns |
| .long v4wb_user_fns |
| .long arm1026_cache_fns |
| .size __arm1026_proc_info, . - __arm1026_proc_info |