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cacheflush.h
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/* * arch/arm/include/asm/cacheflush.h * * Copyright (C) 1999-2002 Russell King * * 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. */ #ifndef _ASMARM_CACHEFLUSH_H #define _ASMARM_CACHEFLUSH_H #include <linux/mm.h> #include <asm/glue.h> #include <asm/shmparam.h> #include <asm/cachetype.h> #define CACHE_COLOUR(vaddr) ((vaddr & (SHMLBA - 1)) >> PAGE_SHIFT) /* * Cache Model * =========== */ #undef _CACHE #undef MULTI_CACHE #if defined(CONFIG_CPU_CACHE_V3) # ifdef _CACHE # define MULTI_CACHE 1 # else # define _CACHE v3 # endif #endif #if defined(CONFIG_CPU_CACHE_V4) # ifdef _CACHE # define MULTI_CACHE 1 # else # define _CACHE v4 # endif #endif #if defined(CONFIG_CPU_ARM920T) || defined(CONFIG_CPU_ARM922T) || \ defined(CONFIG_CPU_ARM925T) || defined(CONFIG_CPU_ARM1020) # define MULTI_CACHE 1 #endif #if defined(CONFIG_CPU_FA526) # ifdef _CACHE # define MULTI_CACHE 1 # else # define _CACHE fa # endif #endif #if defined(CONFIG_CPU_ARM926T) # ifdef _CACHE # define MULTI_CACHE 1 # else # define _CACHE arm926 # endif #endif #if defined(CONFIG_CPU_ARM940T) # ifdef _CACHE # define MULTI_CACHE 1 # else # define _CACHE arm940 # endif #endif #if defined(CONFIG_CPU_ARM946E) # ifdef _CACHE # define MULTI_CACHE 1 # else # define _CACHE arm946 # endif #endif #if defined(CONFIG_CPU_CACHE_V4WB) # ifdef _CACHE # define MULTI_CACHE 1 # else # define _CACHE v4wb # endif #endif #if defined(CONFIG_CPU_XSCALE) # ifdef _CACHE # define MULTI_CACHE 1 # else # define _CACHE xscale # endif #endif #if defined(CONFIG_CPU_XSC3) # ifdef _CACHE # define MULTI_CACHE 1 # else # define _CACHE xsc3 # endif #endif #if defined(CONFIG_CPU_MOHAWK) # ifdef _CACHE # define MULTI_CACHE 1 # else # define _CACHE mohawk # endif #endif #if defined(CONFIG_CPU_FEROCEON) # define MULTI_CACHE 1 #endif #if defined(CONFIG_CPU_V6) //# ifdef _CACHE # define MULTI_CACHE 1 //# else //# define _CACHE v6 //# endif #endif #if defined(CONFIG_CPU_V7) //# ifdef _CACHE # define MULTI_CACHE 1 //# else //# define _CACHE v7 //# endif #endif #if !defined(_CACHE) && !defined(MULTI_CACHE) #error Unknown cache maintainence model #endif /* * This flag is used to indicate that the page pointed to by a pte * is dirty and requires cleaning before returning it to the user. */ #define PG_dcache_dirty PG_arch_1 /* * MM Cache Management * =================== * * The arch/arm/mm/cache-*.S and arch/arm/mm/proc-*.S files * implement these methods. * * Start addresses are inclusive and end addresses are exclusive; * start addresses should be rounded down, end addresses up. * * See Documentation/cachetlb.txt for more information. * Please note that the implementation of these, and the required * effects are cache-type (VIVT/VIPT/PIPT) specific. * * flush_cache_kern_all() * * Unconditionally clean and invalidate the entire cache. * * flush_cache_user_mm(mm) * * Clean and invalidate all user space cache entries * before a change of page tables. * * flush_cache_user_range(start, end, flags) * * Clean and invalidate a range of cache entries in the * specified address space before a change of page tables. * - start - user start address (inclusive, page aligned) * - end - user end address (exclusive, page aligned) * - flags - vma->vm_flags field * * coherent_kern_range(start, end) * * Ensure coherency between the Icache and the Dcache in the * region described by start, end. If you have non-snooping * Harvard caches, you need to implement this function. * - start - virtual start address * - end - virtual end address * * DMA Cache Coherency * =================== * * 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 * * dma_clean_range(start, end) * * Clean (write back) the specified virtual address range. * - start - virtual start address * - end - virtual end address * * dma_flush_range(start, end) * * Clean and invalidate the specified virtual address range. * - start - virtual start address * - end - virtual end address */ struct cpu_cache_fns { void (*flush_kern_all)(void); void (*flush_user_all)(void); void (*flush_user_range)(unsigned long, unsigned long, unsigned int); void (*coherent_kern_range)(unsigned long, unsigned long); void (*coherent_user_range)(unsigned long, unsigned long); void (*flush_kern_dcache_page)(void *); void (*dma_inv_range)(const void *, const void *); void (*dma_clean_range)(const void *, const void *); void (*dma_flush_range)(const void *, const void *); }; struct outer_cache_fns { void (*inv_range)(unsigned long, unsigned long); void (*clean_range)(unsigned long, unsigned long); void (*flush_range)(unsigned long, unsigned long); }; /* * Select the calling method */ #ifdef MULTI_CACHE extern struct cpu_cache_fns cpu_cache; #define __cpuc_flush_kern_all cpu_cache.flush_kern_all #define __cpuc_flush_user_all cpu_cache.flush_user_all #define __cpuc_flush_user_range cpu_cache.flush_user_range #define __cpuc_coherent_kern_range cpu_cache.coherent_kern_range #define __cpuc_coherent_user_range cpu_cache.coherent_user_range #define __cpuc_flush_dcache_page cpu_cache.flush_kern_dcache_page /* * These are private to the dma-mapping API. Do not use directly. * Their sole purpose is to ensure that data held in the cache * is visible to DMA, or data written by DMA to system memory is * visible to the CPU. */ #define dmac_inv_range cpu_cache.dma_inv_range #define dmac_clean_range cpu_cache.dma_clean_range #define dmac_flush_range cpu_cache.dma_flush_range #else #define __cpuc_flush_kern_all __glue(_CACHE,_flush_kern_cache_all) #define __cpuc_flush_user_all __glue(_CACHE,_flush_user_cache_all) #define __cpuc_flush_user_range __glue(_CACHE,_flush_user_cache_range) #define __cpuc_coherent_kern_range __glue(_CACHE,_coherent_kern_range) #define __cpuc_coherent_user_range __glue(_CACHE,_coherent_user_range) #define __cpuc_flush_dcache_page __glue(_CACHE,_flush_kern_dcache_page) extern void __cpuc_flush_kern_all(void); extern void __cpuc_flush_user_all(void); extern void __cpuc_flush_user_range(unsigned long, unsigned long, unsigned int); extern void __cpuc_coherent_kern_range(unsigned long, unsigned long); extern void __cpuc_coherent_user_range(unsigned long, unsigned long); extern void __cpuc_flush_dcache_page(void *); /* * These are private to the dma-mapping API. Do not use directly. * Their sole purpose is to ensure that data held in the cache * is visible to DMA, or data written by DMA to system memory is * visible to the CPU. */ #define dmac_inv_range __glue(_CACHE,_dma_inv_range) #define dmac_clean_range __glue(_CACHE,_dma_clean_range) #define dmac_flush_range __glue(_CACHE,_dma_flush_range) extern void dmac_inv_range(const void *, const void *); extern void dmac_clean_range(const void *, const void *); extern void dmac_flush_range(const void *, const void *); #endif #ifdef CONFIG_OUTER_CACHE extern struct outer_cache_fns outer_cache; static inline void outer_inv_range(unsigned long start, unsigned long end) { if (outer_cache.inv_range) outer_cache.inv_range(start, end); } static inline void outer_clean_range(unsigned long start, unsigned long end) { if (outer_cache.clean_range) outer_cache.clean_range(start, end); } static inline void outer_flush_range(unsigned long start, unsigned long end) { if (outer_cache.flush_range) outer_cache.flush_range(start, end); } #else static inline void outer_inv_range(unsigned long start, unsigned long end) { } static inline void outer_clean_range(unsigned long start, unsigned long end) { } static inline void outer_flush_range(unsigned long start, unsigned long end) { } #endif /* * Copy user data from/to a page which is mapped into a different * processes address space. Really, we want to allow our "user * space" model to handle this. */ #define copy_to_user_page(vma, page, vaddr, dst, src, len) \ do { \ memcpy(dst, src, len); \ flush_ptrace_access(vma, page, vaddr, dst, len, 1);\ } while (0) #define copy_from_user_page(vma, page, vaddr, dst, src, len) \ do { \ memcpy(dst, src, len); \ } while (0) /* * Convert calls to our calling convention. */ #define flush_cache_all() __cpuc_flush_kern_all() #ifndef CONFIG_CPU_CACHE_VIPT static inline void flush_cache_mm(struct mm_struct *mm) { if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm))) __cpuc_flush_user_all(); } static inline void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) __cpuc_flush_user_range(start & PAGE_MASK, PAGE_ALIGN(end), vma->vm_flags); } static inline void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn) { if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) { unsigned long addr = user_addr & PAGE_MASK; __cpuc_flush_user_range(addr, addr + PAGE_SIZE, vma->vm_flags); } } static inline void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, unsigned long uaddr, void *kaddr, unsigned long len, int write) { if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) { unsigned long addr = (unsigned long)kaddr; __cpuc_coherent_kern_range(addr, addr + len); } } #else extern void flush_cache_mm(struct mm_struct *mm); extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); extern void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn); extern void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, unsigned long uaddr, void *kaddr, unsigned long len, int write); #endif #define flush_cache_dup_mm(mm) flush_cache_mm(mm) /* * flush_cache_user_range is used when we want to ensure that the * Harvard caches are synchronised for the user space address range. * This is used for the ARM private sys_cacheflush system call. */ #define flush_cache_user_range(vma,start,end) \ __cpuc_coherent_user_range((start) & PAGE_MASK, PAGE_ALIGN(end)) /* * Perform necessary cache operations to ensure that data previously * stored within this range of addresses can be executed by the CPU. */ #define flush_icache_range(s,e) __cpuc_coherent_kern_range(s,e) /* * Perform necessary cache operations to ensure that the TLB will * see data written in the specified area. */ #define clean_dcache_area(start,size) cpu_dcache_clean_area(start, size) /* * flush_dcache_page is used when the kernel has written to the page * cache page at virtual address page->virtual. * * If this page isn't mapped (ie, page_mapping == NULL), or it might * have userspace mappings, then we _must_ always clean + invalidate * the dcache entries associated with the kernel mapping. * * Otherwise we can defer the operation, and clean the cache when we are * about to change to user space. This is the same method as used on SPARC64. * See update_mmu_cache for the user space part. */ extern void flush_dcache_page(struct page *); extern void __flush_dcache_page(struct address_space *mapping, struct page *page); static inline void __flush_icache_all(void) { #ifdef CONFIG_ARM_ERRATA_411920 extern void v6_icache_inval_all(void); v6_icache_inval_all(); #else asm("mcr p15, 0, %0, c7, c5, 0 @ invalidate I-cache\n" : : "r" (0)); #endif } #define ARCH_HAS_FLUSH_ANON_PAGE static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr) { extern void __flush_anon_page(struct vm_area_struct *vma, struct page *, unsigned long); if (PageAnon(page)) __flush_anon_page(vma, page, vmaddr); } #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE static inline void flush_kernel_dcache_page(struct page *page) { /* highmem pages are always flushed upon kunmap already */ if ((cache_is_vivt() || cache_is_vipt_aliasing()) && !PageHighMem(page)) __cpuc_flush_dcache_page(page_address(page)); } #define flush_dcache_mmap_lock(mapping) \ spin_lock_irq(&(mapping)->tree_lock) #define flush_dcache_mmap_unlock(mapping) \ spin_unlock_irq(&(mapping)->tree_lock) #define flush_icache_user_range(vma,page,addr,len) \ flush_dcache_page(page) /* * We don't appear to need to do anything here. In fact, if we did, we'd * duplicate cache flushing elsewhere performed by flush_dcache_page(). */ #define flush_icache_page(vma,page) do { } while (0) static inline void flush_ioremap_region(unsigned long phys, void __iomem *virt, unsigned offset, size_t size) { const void *start = (void __force *)virt + offset; dmac_inv_range(start, start + size); } /* * flush_cache_vmap() is used when creating mappings (eg, via vmap, * vmalloc, ioremap etc) in kernel space for pages. On non-VIPT * caches, since the direct-mappings of these pages may contain cached * data, we need to do a full cache flush to ensure that writebacks * don't corrupt data placed into these pages via the new mappings. */ static inline void flush_cache_vmap(unsigned long start, unsigned long end) { if (!cache_is_vipt_nonaliasing()) flush_cache_all(); else /* * set_pte_at() called from vmap_pte_range() does not * have a DSB after cleaning the cache line. */ dsb(); } static inline void flush_cache_vunmap(unsigned long start, unsigned long end) { if (!cache_is_vipt_nonaliasing()) flush_cache_all(); } #endif
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