/* *  linux/include/asm-arm/proc-armv/cache.h * *  Copyright (C) 1999-2001 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. */#include <asm/mman.h>/* * 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/* * Cache handling for 32-bit ARM processors. * * Note that on ARM, we have a more accurate specification than that * Linux's "flush".  We therefore do not use "flush" here, but instead * use: * * clean:      the act of pushing dirty cache entries out to memory. * invalidate: the act of discarding data held within the cache, *             whether it is dirty or not. *//* * Generic I + D cache */#define flush_cache_all()						\	do {								\		cpu_cache_clean_invalidate_all();			\	} while (0)/* This is always called for current->mm */#define flush_cache_mm(_mm)						\	do {								\		if ((_mm) == current->active_mm)			\			cpu_cache_clean_invalidate_all();		\	} while (0)#define flush_cache_range(_mm,_start,_end)				\	do {								\		if ((_mm) == current->active_mm)			\			cpu_cache_clean_invalidate_range((_start) & PAGE_MASK, \							 PAGE_ALIGN(_end), 1); \	} while (0)#define flush_cache_page(_vma,_vmaddr)					\	do {								\		if ((_vma)->vm_mm == current->active_mm) {		\			unsigned long _addr = (_vmaddr) & PAGE_MASK;	\			cpu_cache_clean_invalidate_range(_addr,		\				_addr + PAGE_SIZE,			\				((_vma)->vm_flags & VM_EXEC));		\		} \	} while (0)/* * This flushes back any buffered write data.  We have to clean the entries * in the cache for this page.  This does not invalidate either I or D caches. * * Called from: * 1. mm/filemap.c:filemap_nopage * 2. mm/filemap.c:filemap_nopage *    [via do_no_page - ok] * * 3. mm/memory.c:break_cow *    [copy_cow_page doesn't do anything to the cache; insufficient cache *     handling.  Need to add flush_dcache_page() here] * * 4. mm/memory.c:do_swap_page *    [read_swap_cache_async doesn't do anything to the cache: insufficient *     cache handling.  Need to add flush_dcache_page() here] * * 5. mm/memory.c:do_anonymous_page *    [zero page, never written by kernel - ok] * * 6. mm/memory.c:do_no_page *    [we will be calling update_mmu_cache, which will catch on PG_dcache_dirty] * * 7. mm/shmem.c:shmem_nopage * 8. mm/shmem.c:shmem_nopage *    [via do_no_page - ok] * * 9. fs/exec.c:put_dirty_page *    [we call flush_dcache_page prior to this, which will flush out the *     kernel virtual addresses from the dcache - ok] */static __inline__ void flush_page_to_ram(struct page *page){	cpu_flush_ram_page(page_address(page));}/* * D cache only */#define invalidate_dcache_range(_s,_e)	cpu_dcache_invalidate_range((_s),(_e))#define clean_dcache_range(_s,_e)	cpu_dcache_clean_range((_s),(_e))#define flush_dcache_range(_s,_e)	cpu_cache_clean_invalidate_range((_s),(_e),0)/* * 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 has * userspace mappings (page->mapping->i_mmap or page->mapping->i_mmap_shared) * 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. */#define mapping_mapped(map)	((map)->i_mmap || (map)->i_mmap_shared)static inline void flush_dcache_page(struct page *page){	if (page->mapping && !mapping_mapped(page->mapping))		set_bit(PG_dcache_dirty, &page->flags);	else {		unsigned long virt = (unsigned long)page_address(page);		cpu_cache_clean_invalidate_range(virt, virt + PAGE_SIZE, 0);	}}#define flush_icache_user_range(vma,page,addr,len) \	flush_dcache_page(page)#define clean_dcache_entry(_s)		cpu_dcache_clean_entry((unsigned long)(_s))/* * This function is misnamed IMHO.  There are three places where it * is called, each of which is preceded immediately by a call to * flush_page_to_ram: * *  1. kernel/ptrace.c:access_one_page *     called after we have written to the kernel view of a user page. *     The user page has been expundged from the cache by flush_cache_page. *     [we don't need to do anything here if we add a call to *      flush_dcache_page] * *  2. mm/memory.c:do_swap_page *     called after we have (possibly) written to the kernel view of a *     user page, which has previously been removed (ie, has been through *     the swap cache). *     [if the flush_page_to_ram() conditions are satisfied, then ok] * *  3. mm/memory.c:do_no_page *     [if the flush_page_to_ram() conditions are satisfied, then ok] * * Invalidating the icache at the kernels virtual page isn't really * going to do us much good, since we wouldn't have executed any * instructions there. */#define flush_icache_page(vma,pg)	do { } while (0)/* * I cache coherency stuff. * * This *is not* just icache.  It is to make data written to memory * consistent such that instructions fetched from the region are what * we expect. * * This generally means that we have to clean out the Dcache and write * buffers, and maybe flush the Icache in the specified range. */#define flush_icache_range(_s,_e)					\	do {								\		cpu_icache_invalidate_range((_s), (_e));		\	} while (0)/* * TLB flushing. * *  - flush_tlb_all()			flushes all processes TLBs *  - flush_tlb_mm(mm)			flushes the specified mm context TLB's *  - flush_tlb_page(vma, vmaddr)	flushes TLB for specified page *  - flush_tlb_range(mm, start, end)	flushes TLB for specified range of pages * * We drain the write buffer in here to ensure that the page tables in ram * are really up to date.  It is more efficient to do this here... *//* * Notes: *  current->active_mm is the currently active memory description. *  current->mm == NULL iff we are lazy. */#define flush_tlb_all()							\	do {								\		cpu_tlb_invalidate_all();				\	} while (0)/* * Flush all user virtual address space translations described by `_mm'. * * Currently, this is always called for current->mm, which should be * the same as current->active_mm.  This is currently not be called for * the lazy TLB case. */#define flush_tlb_mm(_mm)						\	do {								\		if ((_mm) == current->active_mm)			\			cpu_tlb_invalidate_all();			\	} while (0)/* * Flush the specified range of user virtual address space translations. * * _mm may not be current->active_mm, but may not be NULL. */#define flush_tlb_range(_mm,_start,_end)				\	do {								\		if ((_mm) == current->active_mm)			\			cpu_tlb_invalidate_range((_start), (_end));	\	} while (0)/* * Flush the specified user virtual address space translation. */#define flush_tlb_page(_vma,_page)					\	do {								\		if ((_vma)->vm_mm == current->active_mm)		\			cpu_tlb_invalidate_page((_page),		\				 ((_vma)->vm_flags & VM_EXEC));		\	} while (0)/* * if PG_dcache_dirty is set for the page, we need to ensure that any * cache entries for the kernels virtual memory range are written * back to the page. */extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t pte);/* * Old ARM MEMC stuff.  This supports the reversed mapping handling that * we have on the older 26-bit machines.  We don't have a MEMC chip, so... */#define memc_update_all()		do { } while (0)#define memc_update_mm(mm)		do { } while (0)#define memc_update_addr(mm,pte,log)	do { } while (0)#define memc_clear(mm,physaddr)		do { } while (0)