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Diffstat (limited to 'arch/arm/mm/cache-v6.S')
| -rw-r--r-- | arch/arm/mm/cache-v6.S | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/arch/arm/mm/cache-v6.S b/arch/arm/mm/cache-v6.S new file mode 100644 index 0000000..85c10a7 --- /dev/null +++ b/arch/arm/mm/cache-v6.S @@ -0,0 +1,227 @@ +/* + * linux/arch/arm/mm/cache-v6.S + * + * Copyright (C) 2001 Deep Blue Solutions Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This is the "shell" of the ARMv6 processor support. + */ +#include <linux/linkage.h> +#include <linux/init.h> +#include <asm/assembler.h> + +#include "proc-macros.S" + +#define HARVARD_CACHE +#define CACHE_LINE_SIZE 32 +#define D_CACHE_LINE_SIZE 32 + +/* + * v6_flush_cache_all() + * + * Flush the entire cache. + * + * It is assumed that: + */ +ENTRY(v6_flush_kern_cache_all) + mov r0, #0 +#ifdef HARVARD_CACHE + mcr p15, 0, r0, c7, c14, 0 @ D cache clean+invalidate + mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate +#else + mcr p15, 0, r0, c7, c15, 0 @ Cache clean+invalidate +#endif + mov pc, lr + +/* + * v6_flush_cache_all() + * + * Flush all TLB entries in a particular address space + * + * - mm - mm_struct describing address space + */ +ENTRY(v6_flush_user_cache_all) + /*FALLTHROUGH*/ + +/* + * v6_flush_cache_range(start, end, flags) + * + * Flush a range of TLB entries in the specified address space. + * + * - start - start address (may not be aligned) + * - end - end address (exclusive, may not be aligned) + * - flags - vm_area_struct flags describing address space + * + * It is assumed that: + * - we have a VIPT cache. + */ +ENTRY(v6_flush_user_cache_range) + mov pc, lr + +/* + * v6_coherent_kern_range(start,end) + * + * Ensure that the I and D caches are coherent within specified + * region. This is typically used when code has been written to + * a memory region, and will be executed. + * + * - start - virtual start address of region + * - end - virtual end address of region + * + * It is assumed that: + * - the Icache does not read data from the write buffer + */ +ENTRY(v6_coherent_kern_range) + /* FALLTHROUGH */ + +/* + * v6_coherent_user_range(start,end) + * + * Ensure that the I and D caches are coherent within specified + * region. This is typically used when code has been written to + * a memory region, and will be executed. + * + * - start - virtual start address of region + * - end - virtual end address of region + * + * It is assumed that: + * - the Icache does not read data from the write buffer + */ +ENTRY(v6_coherent_user_range) + bic r0, r0, #CACHE_LINE_SIZE - 1 +1: +#ifdef HARVARD_CACHE + mcr p15, 0, r0, c7, c10, 1 @ clean D line + mcr p15, 0, r0, c7, c5, 1 @ invalidate I line +#endif + mcr p15, 0, r0, c7, c5, 7 @ invalidate BTB entry + add r0, r0, #CACHE_LINE_SIZE + cmp r0, r1 + blo 1b +#ifdef HARVARD_CACHE + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer +#endif + mov pc, lr + +/* + * v6_flush_kern_dcache_page(kaddr) + * + * Ensure that the data held in the page kaddr is written back + * to the page in question. + * + * - kaddr - kernel address (guaranteed to be page aligned) + */ +ENTRY(v6_flush_kern_dcache_page) + add r1, r0, #PAGE_SZ +1: +#ifdef HARVARD_CACHE + mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line +#else + mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate unified line +#endif + add r0, r0, #D_CACHE_LINE_SIZE + cmp r0, r1 + blo 1b +#ifdef HARVARD_CACHE + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 +#endif + mov pc, lr + + +/* + * v6_dma_inv_range(start,end) + * + * Invalidate the data cache within the specified region; we will + * be performing a DMA operation in this region and we want to + * purge old data in the cache. + * + * - start - virtual start address of region + * - end - virtual end address of region + */ +ENTRY(v6_dma_inv_range) + tst r0, #D_CACHE_LINE_SIZE - 1 + bic r0, r0, #D_CACHE_LINE_SIZE - 1 +#ifdef HARVARD_CACHE + mcrne p15, 0, r0, c7, c10, 1 @ clean D line +#else + mcrne p15, 0, r0, c7, c11, 1 @ clean unified line +#endif + tst r1, #D_CACHE_LINE_SIZE - 1 + bic r1, r1, #D_CACHE_LINE_SIZE - 1 +#ifdef HARVARD_CACHE + mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D line +#else + mcrne p15, 0, r1, c7, c15, 1 @ clean & invalidate unified line +#endif +1: +#ifdef HARVARD_CACHE + mcr p15, 0, r0, c7, c6, 1 @ invalidate D line +#else + mcr p15, 0, r0, c7, c7, 1 @ invalidate unified line +#endif + add r0, r0, #D_CACHE_LINE_SIZE + cmp r0, r1 + blo 1b + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + mov pc, lr + +/* + * v6_dma_clean_range(start,end) + * - start - virtual start address of region + * - end - virtual end address of region + */ +ENTRY(v6_dma_clean_range) + bic r0, r0, #D_CACHE_LINE_SIZE - 1 +1: +#ifdef HARVARD_CACHE + mcr p15, 0, r0, c7, c10, 1 @ clean D line +#else + mcr p15, 0, r0, c7, c11, 1 @ clean unified line +#endif + add r0, r0, #D_CACHE_LINE_SIZE + cmp r0, r1 + blo 1b + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + mov pc, lr + +/* + * v6_dma_flush_range(start,end) + * - start - virtual start address of region + * - end - virtual end address of region + */ +ENTRY(v6_dma_flush_range) + bic r0, r0, #D_CACHE_LINE_SIZE - 1 +1: +#ifdef HARVARD_CACHE + mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line +#else + mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate line +#endif + add r0, r0, #D_CACHE_LINE_SIZE + cmp r0, r1 + blo 1b + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + mov pc, lr + + __INITDATA + + .type v6_cache_fns, #object +ENTRY(v6_cache_fns) + .long v6_flush_kern_cache_all + .long v6_flush_user_cache_all + .long v6_flush_user_cache_range + .long v6_coherent_kern_range + .long v6_coherent_user_range + .long v6_flush_kern_dcache_page + .long v6_dma_inv_range + .long v6_dma_clean_range + .long v6_dma_flush_range + .size v6_cache_fns, . - v6_cache_fns |