diff options
Diffstat (limited to 'arch/mips/mm/cache.c')
| -rw-r--r-- | arch/mips/mm/cache.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c new file mode 100644 index 00000000000..1d95cdb77be --- /dev/null +++ b/arch/mips/mm/cache.c @@ -0,0 +1,157 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1994 - 2003 by Ralf Baechle + */ +#include <linux/config.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/mm.h> + +#include <asm/cacheflush.h> +#include <asm/processor.h> +#include <asm/cpu.h> +#include <asm/cpu-features.h> + +/* Cache operations. */ +void (*flush_cache_all)(void); +void (*__flush_cache_all)(void); +void (*flush_cache_mm)(struct mm_struct *mm); +void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start, + unsigned long end); +void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn); +void (*flush_icache_range)(unsigned long start, unsigned long end); +void (*flush_icache_page)(struct vm_area_struct *vma, struct page *page); + +/* MIPS specific cache operations */ +void (*flush_cache_sigtramp)(unsigned long addr); +void (*flush_data_cache_page)(unsigned long addr); +void (*flush_icache_all)(void); + +#ifdef CONFIG_DMA_NONCOHERENT + +/* DMA cache operations. */ +void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); +void (*_dma_cache_wback)(unsigned long start, unsigned long size); +void (*_dma_cache_inv)(unsigned long start, unsigned long size); + +EXPORT_SYMBOL(_dma_cache_wback_inv); +EXPORT_SYMBOL(_dma_cache_wback); +EXPORT_SYMBOL(_dma_cache_inv); + +#endif /* CONFIG_DMA_NONCOHERENT */ + +/* + * We could optimize the case where the cache argument is not BCACHE but + * that seems very atypical use ... + */ +asmlinkage int sys_cacheflush(unsigned long addr, unsigned long int bytes, + unsigned int cache) +{ + if (!access_ok(VERIFY_WRITE, (void *) addr, bytes)) + return -EFAULT; + + flush_icache_range(addr, addr + bytes); + + return 0; +} + +void __flush_dcache_page(struct page *page) +{ + struct address_space *mapping = page_mapping(page); + unsigned long addr; + + if (mapping && !mapping_mapped(mapping)) { + SetPageDcacheDirty(page); + return; + } + + /* + * We could delay the flush for the !page_mapping case too. But that + * case is for exec env/arg pages and those are %99 certainly going to + * get faulted into the tlb (and thus flushed) anyways. + */ + addr = (unsigned long) page_address(page); + flush_data_cache_page(addr); +} + +EXPORT_SYMBOL(__flush_dcache_page); + +void __update_cache(struct vm_area_struct *vma, unsigned long address, + pte_t pte) +{ + struct page *page; + unsigned long pfn, addr; + + pfn = pte_pfn(pte); + if (pfn_valid(pfn) && (page = pfn_to_page(pfn), page_mapping(page)) && + Page_dcache_dirty(page)) { + if (pages_do_alias((unsigned long)page_address(page), + address & PAGE_MASK)) { + addr = (unsigned long) page_address(page); + flush_data_cache_page(addr); + } + + ClearPageDcacheDirty(page); + } +} + +extern void ld_mmu_r23000(void); +extern void ld_mmu_r4xx0(void); +extern void ld_mmu_tx39(void); +extern void ld_mmu_r6000(void); +extern void ld_mmu_tfp(void); +extern void ld_mmu_andes(void); +extern void ld_mmu_sb1(void); + +void __init cpu_cache_init(void) +{ + if (cpu_has_4ktlb) { +#if defined(CONFIG_CPU_R4X00) || defined(CONFIG_CPU_VR41XX) || \ + defined(CONFIG_CPU_R4300) || defined(CONFIG_CPU_R5000) || \ + defined(CONFIG_CPU_NEVADA) || defined(CONFIG_CPU_R5432) || \ + defined(CONFIG_CPU_R5500) || defined(CONFIG_CPU_MIPS32) || \ + defined(CONFIG_CPU_MIPS64) || defined(CONFIG_CPU_TX49XX) || \ + defined(CONFIG_CPU_RM7000) || defined(CONFIG_CPU_RM9000) + ld_mmu_r4xx0(); +#endif + } else switch (current_cpu_data.cputype) { +#ifdef CONFIG_CPU_R3000 + case CPU_R2000: + case CPU_R3000: + case CPU_R3000A: + case CPU_R3081E: + ld_mmu_r23000(); + break; +#endif +#ifdef CONFIG_CPU_TX39XX + case CPU_TX3912: + case CPU_TX3922: + case CPU_TX3927: + ld_mmu_tx39(); + break; +#endif +#ifdef CONFIG_CPU_R10000 + case CPU_R10000: + case CPU_R12000: + ld_mmu_r4xx0(); + break; +#endif +#ifdef CONFIG_CPU_SB1 + case CPU_SB1: + ld_mmu_sb1(); + break; +#endif + + case CPU_R8000: + panic("R8000 is unsupported"); + break; + + default: + panic("Yeee, unsupported cache architecture."); + } +} |