[linux-2.6-block.git] / arch / x86 / include / asm / cacheflush.h

#ifndef _ASM_X86_CACHEFLUSH_H
#define _ASM_X86_CACHEFLUSH_H

/* Keep includes the same across arches.  */
#include <linux/mm.h>

/* Caches aren't brain-dead on the intel. */
static inline void flush_cache_all(void) { }
static inline void flush_cache_mm(struct mm_struct *mm) { }
static inline void flush_cache_dup_mm(struct mm_struct *mm) { }
static inline void flush_cache_range(struct vm_area_struct *vma,
				     unsigned long start, unsigned long end) { }
static inline void flush_cache_page(struct vm_area_struct *vma,
				    unsigned long vmaddr, unsigned long pfn) { }
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
static inline void flush_dcache_page(struct page *page) { }
static inline void flush_dcache_mmap_lock(struct address_space *mapping) { }
static inline void flush_dcache_mmap_unlock(struct address_space *mapping) { }
static inline void flush_icache_range(unsigned long start,
				      unsigned long end) { }
static inline void flush_icache_page(struct vm_area_struct *vma,
				     struct page *page) { }
static inline void flush_icache_user_range(struct vm_area_struct *vma,
					   struct page *page,
					   unsigned long addr,
					   unsigned long len) { }
static inline void flush_cache_vmap(unsigned long start, unsigned long end) { }
static inline void flush_cache_vunmap(unsigned long start,
				      unsigned long end) { }

static inline void copy_to_user_page(struct vm_area_struct *vma,
				     struct page *page, unsigned long vaddr,
				     void *dst, const void *src,
				     unsigned long len)
{
	memcpy(dst, src, len);
}

static inline void copy_from_user_page(struct vm_area_struct *vma,
				       struct page *page, unsigned long vaddr,
				       void *dst, const void *src,
				       unsigned long len)
{
	memcpy(dst, src, len);
}

#define PG_WC				PG_arch_1
PAGEFLAG(WC, WC)

#ifdef CONFIG_X86_PAT
/*
 * X86 PAT uses page flags WC and Uncached together to keep track of
 * memory type of pages that have backing page struct. X86 PAT supports 3
 * different memory types, _PAGE_CACHE_WB, _PAGE_CACHE_WC and
 * _PAGE_CACHE_UC_MINUS and fourth state where page's memory type has not
 * been changed from its default (value of -1 used to denote this).
 * Note we do not support _PAGE_CACHE_UC here.
 *
 * Caller must hold memtype_lock for atomicity.
 */
static inline unsigned long get_page_memtype(struct page *pg)
{
	if (!PageUncached(pg) && !PageWC(pg))
		return -1;
	else if (!PageUncached(pg) && PageWC(pg))
		return _PAGE_CACHE_WC;
	else if (PageUncached(pg) && !PageWC(pg))
		return _PAGE_CACHE_UC_MINUS;
	else
		return _PAGE_CACHE_WB;
}

static inline void set_page_memtype(struct page *pg, unsigned long memtype)
{
	switch (memtype) {
	case _PAGE_CACHE_WC:
		ClearPageUncached(pg);
		SetPageWC(pg);
		break;
	case _PAGE_CACHE_UC_MINUS:
		SetPageUncached(pg);
		ClearPageWC(pg);
		break;
	case _PAGE_CACHE_WB:
		SetPageUncached(pg);
		SetPageWC(pg);
		break;
	default:
	case -1:
		ClearPageUncached(pg);
		ClearPageWC(pg);
		break;
	}
}
#else
static inline unsigned long get_page_memtype(struct page *pg) { return -1; }
static inline void set_page_memtype(struct page *pg, unsigned long memtype) { }
#endif

/*
 * The set_memory_* API can be used to change various attributes of a virtual
 * address range. The attributes include:
 * Cachability   : UnCached, WriteCombining, WriteBack
 * Executability : eXeutable, NoteXecutable
 * Read/Write    : ReadOnly, ReadWrite
 * Presence      : NotPresent
 *
 * Within a catagory, the attributes are mutually exclusive.
 *
 * The implementation of this API will take care of various aspects that
 * are associated with changing such attributes, such as:
 * - Flushing TLBs
 * - Flushing CPU caches
 * - Making sure aliases of the memory behind the mapping don't violate
 *   coherency rules as defined by the CPU in the system.
 *
 * What this API does not do:
 * - Provide exclusion between various callers - including callers that
 *   operation on other mappings of the same physical page
 * - Restore default attributes when a page is freed
 * - Guarantee that mappings other than the requested one are
 *   in any state, other than that these do not violate rules for
 *   the CPU you have. Do not depend on any effects on other mappings,
 *   CPUs other than the one you have may have more relaxed rules.
 * The caller is required to take care of these.
 */

int _set_memory_uc(unsigned long addr, int numpages);
int _set_memory_wc(unsigned long addr, int numpages);
int _set_memory_wb(unsigned long addr, int numpages);
int set_memory_uc(unsigned long addr, int numpages);
int set_memory_wc(unsigned long addr, int numpages);
int set_memory_wb(unsigned long addr, int numpages);
int set_memory_x(unsigned long addr, int numpages);
int set_memory_nx(unsigned long addr, int numpages);
int set_memory_ro(unsigned long addr, int numpages);
int set_memory_rw(unsigned long addr, int numpages);
int set_memory_np(unsigned long addr, int numpages);
int set_memory_4k(unsigned long addr, int numpages);

int set_memory_array_uc(unsigned long *addr, int addrinarray);
int set_memory_array_wb(unsigned long *addr, int addrinarray);

int set_pages_array_uc(struct page **pages, int addrinarray);
int set_pages_array_wb(struct page **pages, int addrinarray);

/*
 * For legacy compatibility with the old APIs, a few functions
 * are provided that work on a "struct page".
 * These functions operate ONLY on the 1:1 kernel mapping of the
 * memory that the struct page represents, and internally just
 * call the set_memory_* function. See the description of the
 * set_memory_* function for more details on conventions.
 *
 * These APIs should be considered *deprecated* and are likely going to
 * be removed in the future.
 * The reason for this is the implicit operation on the 1:1 mapping only,
 * making this not a generally useful API.
 *
 * Specifically, many users of the old APIs had a virtual address,
 * called virt_to_page() or vmalloc_to_page() on that address to
 * get a struct page* that the old API required.
 * To convert these cases, use set_memory_*() on the original
 * virtual address, do not use these functions.
 */

int set_pages_uc(struct page *page, int numpages);
int set_pages_wb(struct page *page, int numpages);
int set_pages_x(struct page *page, int numpages);
int set_pages_nx(struct page *page, int numpages);
int set_pages_ro(struct page *page, int numpages);
int set_pages_rw(struct page *page, int numpages);


void clflush_cache_range(void *addr, unsigned int size);

#ifdef CONFIG_DEBUG_RODATA
void mark_rodata_ro(void);
extern const int rodata_test_data;
void set_kernel_text_rw(void);
void set_kernel_text_ro(void);
#else
static inline void set_kernel_text_rw(void) { }
static inline void set_kernel_text_ro(void) { }
#endif

#ifdef CONFIG_DEBUG_RODATA_TEST
int rodata_test(void);
#else
static inline int rodata_test(void)
{
	return 0;
}
#endif

#endif /* _ASM_X86_CACHEFLUSH_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_CACHEFLUSH_H
1965aae3 PA	2	#define _ASM_X86_CACHEFLUSH_H
b2bba72c TG	3
	4	/* Keep includes the same across arches. */
	5	#include <linux/mm.h>
	6
	7	/* Caches aren't brain-dead on the intel. */
d3251005 TH	8	static inline void flush_cache_all(void) { }
	9	static inline void flush_cache_mm(struct mm_struct *mm) { }
	10	static inline void flush_cache_dup_mm(struct mm_struct *mm) { }
	11	static inline void flush_cache_range(struct vm_area_struct *vma,
	12	unsigned long start, unsigned long end) { }
	13	static inline void flush_cache_page(struct vm_area_struct *vma,
	14	unsigned long vmaddr, unsigned long pfn) { }
2d4dc890	15	#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
d3251005 TH	16	static inline void flush_dcache_page(struct page *page) { }
	17	static inline void flush_dcache_mmap_lock(struct address_space *mapping) { }
	18	static inline void flush_dcache_mmap_unlock(struct address_space *mapping) { }
	19	static inline void flush_icache_range(unsigned long start,
	20	unsigned long end) { }
	21	static inline void flush_icache_page(struct vm_area_struct *vma,
	22	struct page *page) { }
	23	static inline void flush_icache_user_range(struct vm_area_struct *vma,
	24	struct page *page,
	25	unsigned long addr,
	26	unsigned long len) { }
	27	static inline void flush_cache_vmap(unsigned long start, unsigned long end) { }
	28	static inline void flush_cache_vunmap(unsigned long start,
	29	unsigned long end) { }
b2bba72c	30
d3251005 TH	31	static inline void copy_to_user_page(struct vm_area_struct *vma,
	32	struct page *page, unsigned long vaddr,
	33	void dst, const void src,
	34	unsigned long len)
	35	{
	36	memcpy(dst, src, len);
	37	}
	38
	39	static inline void copy_from_user_page(struct vm_area_struct *vma,
	40	struct page *page, unsigned long vaddr,
	41	void dst, const void src,
	42	unsigned long len)
	43	{
	44	memcpy(dst, src, len);
	45	}
b2bba72c	46
f5841740 VP	47	#define PG_WC PG_arch_1
	48	PAGEFLAG(WC, WC)
	49
	50	#ifdef CONFIG_X86_PAT
	51	/*
	52	* X86 PAT uses page flags WC and Uncached together to keep track of
	53	* memory type of pages that have backing page struct. X86 PAT supports 3
	54	* different memory types, _PAGE_CACHE_WB, _PAGE_CACHE_WC and
	55	* _PAGE_CACHE_UC_MINUS and fourth state where page's memory type has not
	56	* been changed from its default (value of -1 used to denote this).
	57	* Note we do not support _PAGE_CACHE_UC here.
	58	*
	59	* Caller must hold memtype_lock for atomicity.
	60	*/
	61	static inline unsigned long get_page_memtype(struct page *pg)
	62	{
	63	if (!PageUncached(pg) && !PageWC(pg))
	64	return -1;
	65	else if (!PageUncached(pg) && PageWC(pg))
	66	return _PAGE_CACHE_WC;
	67	else if (PageUncached(pg) && !PageWC(pg))
	68	return _PAGE_CACHE_UC_MINUS;
	69	else
	70	return _PAGE_CACHE_WB;
	71	}
	72
	73	static inline void set_page_memtype(struct page *pg, unsigned long memtype)
	74	{
	75	switch (memtype) {
	76	case _PAGE_CACHE_WC:
	77	ClearPageUncached(pg);
	78	SetPageWC(pg);
	79	break;
	80	case _PAGE_CACHE_UC_MINUS:
	81	SetPageUncached(pg);
	82	ClearPageWC(pg);
	83	break;
	84	case _PAGE_CACHE_WB:
	85	SetPageUncached(pg);
	86	SetPageWC(pg);
	87	break;
	88	default:
	89	case -1:
	90	ClearPageUncached(pg);
	91	ClearPageWC(pg);
	92	break;
	93	}
	94	}
	95	#else
	96	static inline unsigned long get_page_memtype(struct page *pg) { return -1; }
	97	static inline void set_page_memtype(struct page *pg, unsigned long memtype) { }
	98	#endif
75cbade8	99
7219bebd AV	100	/*
	101	* The set_memory_* API can be used to change various attributes of a virtual
	102	* address range. The attributes include:
	103	* Cachability : UnCached, WriteCombining, WriteBack
	104	* Executability : eXeutable, NoteXecutable
	105	* Read/Write : ReadOnly, ReadWrite
	106	* Presence : NotPresent
	107	*
	108	* Within a catagory, the attributes are mutually exclusive.
	109	*
	110	* The implementation of this API will take care of various aspects that
	111	* are associated with changing such attributes, such as:
	112	* - Flushing TLBs
	113	* - Flushing CPU caches
	114	* - Making sure aliases of the memory behind the mapping don't violate
	115	* coherency rules as defined by the CPU in the system.
	116	*
	117	* What this API does not do:
	118	* - Provide exclusion between various callers - including callers that
	119	* operation on other mappings of the same physical page
	120	* - Restore default attributes when a page is freed
	121	* - Guarantee that mappings other than the requested one are
	122	* in any state, other than that these do not violate rules for
	123	* the CPU you have. Do not depend on any effects on other mappings,
	124	* CPUs other than the one you have may have more relaxed rules.
	125	* The caller is required to take care of these.
	126	*/
75cbade8	127
1219333d	128	int _set_memory_uc(unsigned long addr, int numpages);
ef354af4	129	int _set_memory_wc(unsigned long addr, int numpages);
1219333d	130	int _set_memory_wb(unsigned long addr, int numpages);
75cbade8	131	int set_memory_uc(unsigned long addr, int numpages);
ef354af4	132	int set_memory_wc(unsigned long addr, int numpages);
75cbade8 AV	133	int set_memory_wb(unsigned long addr, int numpages);
	134	int set_memory_x(unsigned long addr, int numpages);
	135	int set_memory_nx(unsigned long addr, int numpages);
	136	int set_memory_ro(unsigned long addr, int numpages);
	137	int set_memory_rw(unsigned long addr, int numpages);
f62d0f00	138	int set_memory_np(unsigned long addr, int numpages);
c9caa02c	139	int set_memory_4k(unsigned long addr, int numpages);
75cbade8	140
d75586ad SL	141	int set_memory_array_uc(unsigned long *addr, int addrinarray);
	142	int set_memory_array_wb(unsigned long *addr, int addrinarray);
	143
0f350755	144	int set_pages_array_uc(struct page **pages, int addrinarray);
	145	int set_pages_array_wb(struct page **pages, int addrinarray);
	146
7219bebd AV	147	/*
	148	* For legacy compatibility with the old APIs, a few functions
	149	* are provided that work on a "struct page".
	150	* These functions operate ONLY on the 1:1 kernel mapping of the
	151	* memory that the struct page represents, and internally just
	152	* call the set_memory_* function. See the description of the
	153	* set_memory_* function for more details on conventions.
	154	*
	155	* These APIs should be considered deprecated and are likely going to
	156	* be removed in the future.
	157	* The reason for this is the implicit operation on the 1:1 mapping only,
	158	* making this not a generally useful API.
	159	*
	160	* Specifically, many users of the old APIs had a virtual address,
	161	* called virt_to_page() or vmalloc_to_page() on that address to
	162	* get a struct page* that the old API required.
	163	* To convert these cases, use set_memory_*() on the original
	164	* virtual address, do not use these functions.
	165	*/
	166
	167	int set_pages_uc(struct page *page, int numpages);
	168	int set_pages_wb(struct page *page, int numpages);
	169	int set_pages_x(struct page *page, int numpages);
	170	int set_pages_nx(struct page *page, int numpages);
	171	int set_pages_ro(struct page *page, int numpages);
	172	int set_pages_rw(struct page *page, int numpages);
	173
	174
4c61afcd	175	void clflush_cache_range(void *addr, unsigned int size);
b2bba72c	176
b2bba72c TG	177	#ifdef CONFIG_DEBUG_RODATA
b2bba72c TG	178	void mark_rodata_ro(void);
7bfeab9a	179	extern const int rodata_test_data;
16239630 SR	180	void set_kernel_text_rw(void);
	181	void set_kernel_text_ro(void);
	182	#else
	183	static inline void set_kernel_text_rw(void) { }
	184	static inline void set_kernel_text_ro(void) { }
b2bba72c	185	#endif
7bfeab9a	186
edeed305	187	#ifdef CONFIG_DEBUG_RODATA_TEST
7bfeab9a	188	int rodata_test(void);
edeed305	189	#else
7bfeab9a	190	static inline int rodata_test(void)
edeed305	191	{
7bfeab9a	192	return 0;
edeed305 AV	193	}
edeed305 AV	194	#endif
b2bba72c	195
1965aae3	196	#endif /* _ASM_X86_CACHEFLUSH_H */