/* *  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-cache.h>#include <asm/shmparam.h>#include <asm/cachetype.h>#include <asm/outercache.h> #define CACHE_COLOUR(vaddr)	((vaddr & (SHMLBA - 1)) >> PAGE_SHIFT) /* * This flag is used to indicate that the page pointed to by a pte is clean * and does not require cleaning before returning it to the user. */#define PG_dcache_clean 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_icache_all() * *		Unconditionally clean and invalidate the entire icache. *		Currently only needed for cache-v6.S and cache-v7.S, see *		__flush_icache_all for the generic implementation. * *	flush_kern_all() * *		Unconditionally clean and invalidate the entire cache. * *     flush_kern_louis() * *             Flush data cache levels up to the level of unification *             inner shareable and invalidate the I-cache. *             Only needed from v7 onwards, falls back to flush_cache_all() *             for all other processor versions. * *	flush_user_all() * *		Clean and invalidate all user space cache entries *		before a change of page tables. * *	flush_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 * *	coherent_user_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 * *	flush_kern_dcache_area(kaddr, size) * *		Ensure that the data held in page is written back. *		- kaddr  - page address *		- size   - region size * *	DMA Cache Coherency *	=================== * *	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_icache_all)(void);	void (*flush_kern_all)(void);	void (*flush_kern_louis)(void);	void (*flush_user_all)(void);	void (*flush_user_range)(unsigned long, unsigned long, unsigned int); 	void (*coherent_kern_range)(unsigned long, unsigned long);	int  (*coherent_user_range)(unsigned long, unsigned long);	void (*flush_kern_dcache_area)(void *, size_t); 	void (*dma_map_area)(const void *, size_t, int);	void (*dma_unmap_area)(const void *, size_t, int); 	void (*dma_flush_range)(const void *, const void *);}; /* * Select the calling method */#ifdef MULTI_CACHE extern struct cpu_cache_fns cpu_cache; #define __cpuc_flush_icache_all		cpu_cache.flush_icache_all#define __cpuc_flush_kern_all		cpu_cache.flush_kern_all#define __cpuc_flush_kern_louis		cpu_cache.flush_kern_louis#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_area	cpu_cache.flush_kern_dcache_area /* * 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_map_area			cpu_cache.dma_map_area#define dmac_unmap_area			cpu_cache.dma_unmap_area#define dmac_flush_range		cpu_cache.dma_flush_range #else extern void __cpuc_flush_icache_all(void);extern void __cpuc_flush_kern_all(void);extern void __cpuc_flush_kern_louis(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 int  __cpuc_coherent_user_range(unsigned long, unsigned long);extern void __cpuc_flush_dcache_area(void *, size_t); /* * 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. */extern void dmac_map_area(const void *, size_t, int);extern void dmac_unmap_area(const void *, size_t, int);extern void dmac_flush_range(const void *, const void *); #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. */extern void copy_to_user_page(struct vm_area_struct *, struct page *,	unsigned long, void *, const void *, unsigned long);#define copy_from_user_page(vma, page, vaddr, dst, src, len) \	do {							\		memcpy(dst, src, len);				\	} while (0) /* * Convert calls to our calling convention. */ /* Invalidate I-cache */#define __flush_icache_all_generic()					\	asm("mcr	p15, 0, %0, c7, c5, 0"				\	    : : "r" (0)); /* Invalidate I-cache inner shareable */#define __flush_icache_all_v7_smp()					\	asm("mcr	p15, 0, %0, c7, c1, 0"				\	    : : "r" (0)); /* * Optimized __flush_icache_all for the common cases. Note that UP ARMv7 * will fall through to use __flush_icache_all_generic. */#if (defined(CONFIG_CPU_V7) && \     (defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K))) || \	defined(CONFIG_SMP_ON_UP)#define __flush_icache_preferred	__cpuc_flush_icache_all#elif __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)#define __flush_icache_preferred	__flush_icache_all_v7_smp#elif __LINUX_ARM_ARCH__ == 6 && defined(CONFIG_ARM_ERRATA_411920)#define __flush_icache_preferred	__cpuc_flush_icache_all#else#define __flush_icache_preferred	__flush_icache_all_generic#endif static inline void __flush_icache_all(void){	__flush_icache_preferred();} /* * Flush caches up to Level of Unification Inner Shareable */#define flush_cache_louis()		__cpuc_flush_kern_louis() #define flush_cache_all()		__cpuc_flush_kern_all() static inline void vivt_flush_cache_mm(struct mm_struct *mm){	if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm)))		__cpuc_flush_user_all();} static inline voidvivt_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end){	struct mm_struct *mm = vma->vm_mm; 	if (!mm || cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm)))		__cpuc_flush_user_range(start & PAGE_MASK, PAGE_ALIGN(end),					vma->vm_flags);} static inline voidvivt_flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn){	struct mm_struct *mm = vma->vm_mm; 	if (!mm || cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm))) {		unsigned long addr = user_addr & PAGE_MASK;		__cpuc_flush_user_range(addr, addr + PAGE_SIZE, vma->vm_flags);	}} #ifndef CONFIG_CPU_CACHE_VIPT#define flush_cache_mm(mm) \		vivt_flush_cache_mm(mm)#define flush_cache_range(vma,start,end) \		vivt_flush_cache_range(vma,start,end)#define flush_cache_page(vma,addr,pfn) \		vivt_flush_cache_page(vma,addr,pfn)#elseextern 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);#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(s,e)	__cpuc_coherent_user_range(s,e) /* * 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. */#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1extern void flush_dcache_page(struct page *); static inline void flush_kernel_vmap_range(void *addr, int size){	if ((cache_is_vivt() || cache_is_vipt_aliasing()))	  __cpuc_flush_dcache_area(addr, (size_t)size);}static inline void invalidate_kernel_vmap_range(void *addr, int size){	if ((cache_is_vivt() || cache_is_vipt_aliasing()))	  __cpuc_flush_dcache_area(addr, (size_t)size);} #define ARCH_HAS_FLUSH_ANON_PAGEstatic 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_PAGEextern void flush_kernel_dcache_page(struct 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) /* * 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(ishst);} static inline void flush_cache_vunmap(unsigned long start, unsigned long end){	if (!cache_is_vipt_nonaliasing())		flush_cache_all();} /* * Memory synchronization helpers for mixed cached vs non cached accesses. * * Some synchronization algorithms have to set states in memory with the * cache enabled or disabled depending on the code path.  It is crucial * to always ensure proper cache maintenance to update main memory right * away in that case. * * Any cached write must be followed by a cache clean operation. * Any cached read must be preceded by a cache invalidate operation. * Yet, in the read case, a cache flush i.e. atomic clean+invalidate * operation is needed to avoid discarding possible concurrent writes to the * accessed memory. * * Also, in order to prevent a cached writer from interfering with an * adjacent non-cached writer, each state variable must be located to * a separate cache line. */ /* * This needs to be >= the max cache writeback size of all * supported platforms included in the current kernel configuration. * This is used to align state variables to their own cache lines. */#define __CACHE_WRITEBACK_ORDER 6  /* guessed from existing platforms */#define __CACHE_WRITEBACK_GRANULE (1 << __CACHE_WRITEBACK_ORDER) /* * There is no __cpuc_clean_dcache_area but we use it anyway for * code intent clarity, and alias it to __cpuc_flush_dcache_area. */#define __cpuc_clean_dcache_area __cpuc_flush_dcache_area /* * Ensure preceding writes to *p by this CPU are visible to * subsequent reads by other CPUs: */static inline void __sync_cache_range_w(volatile void *p, size_t size){	char *_p = (char *)p; 	__cpuc_clean_dcache_area(_p, size);	outer_clean_range(__pa(_p), __pa(_p + size));} /* * Ensure preceding writes to *p by other CPUs are visible to * subsequent reads by this CPU.  We must be careful not to * discard data simultaneously written by another CPU, hence the * usage of flush rather than invalidate operations. */static inline void __sync_cache_range_r(volatile void *p, size_t size){	char *_p = (char *)p; #ifdef CONFIG_OUTER_CACHE	if (outer_cache.flush_range) {		/*		 * Ensure dirty data migrated from other CPUs into our cache		 * are cleaned out safely before the outer cache is cleaned:		 */		__cpuc_clean_dcache_area(_p, size); 		/* Clean and invalidate stale data for *p from outer ... */		outer_flush_range(__pa(_p), __pa(_p + size));	}#endif 	/* ... and inner cache: */	__cpuc_flush_dcache_area(_p, size);} #define sync_cache_w(ptr) __sync_cache_range_w(ptr, sizeof *(ptr))#define sync_cache_r(ptr) __sync_cache_range_r(ptr, sizeof *(ptr)) /* * Disabling cache access for one CPU in an ARMv7 SMP system is tricky. * To do so we must: * * - Clear the SCTLR.C bit to prevent further cache allocations * - Flush the desired level of cache * - Clear the ACTLR "SMP" bit to disable local coherency * * ... and so without any intervening memory access in between those steps, * not even to the stack. * * WARNING -- After this has been called: * * - No ldrex/strex (and similar) instructions must be used. * - The CPU is obviously no longer coherent with the other CPUs. * - This is unlikely to work as expected if Linux is running non-secure. * * Note: * * - This is known to apply to several ARMv7 processor implementations, *   however some exceptions may exist.  Caveat emptor. * * - The clobber list is dictated by the call to v7_flush_dcache_*. *   fp is preserved to the stack explicitly prior disabling the cache *   since adding it to the clobber list is incompatible with having *   CONFIG_FRAME_POINTER=y.  ip is saved as well if ever r12-clobbering *   trampoline are inserted by the linker and to keep sp 64-bit aligned. */#define v7_exit_coherency_flush(level) \	asm volatile( \	"stmfd	sp!, {fp, ip} \n\t" \	"mrc	p15, 0, r0, c1, c0, 0	@ get SCTLR \n\t" \	"bic	r0, r0, #"__stringify(CR_C)" \n\t" \	"mcr	p15, 0, r0, c1, c0, 0	@ set SCTLR \n\t" \	"isb	\n\t" \	"bl	v7_flush_dcache_"__stringify(level)" \n\t" \	"clrex	\n\t" \	"mrc	p15, 0, r0, c1, c0, 1	@ get ACTLR \n\t" \	"bic	r0, r0, #(1 << 6)	@ disable local coherency \n\t" \	"mcr	p15, 0, r0, c1, c0, 1	@ set ACTLR \n\t" \	"isb	\n\t" \	"dsb	\n\t" \	"ldmfd	sp!, {fp, ip}" \	: : : "r0","r1","r2","r3","r4","r5","r6","r7", \	      "r9","r10","lr","memory" ) #endif