167 lines
5.7 KiB
C
167 lines
5.7 KiB
C
#ifndef _ASM_X86_CACHEFLUSH_H
|
|
#define _ASM_X86_CACHEFLUSH_H
|
|
|
|
/* Caches aren't brain-dead on the intel. */
|
|
#include <asm-generic/cacheflush.h>
|
|
#include <asm/special_insns.h>
|
|
|
|
#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.
|
|
*/
|
|
|
|
#define _PGMT_DEFAULT 0
|
|
#define _PGMT_WC (1UL << PG_arch_1)
|
|
#define _PGMT_UC_MINUS (1UL << PG_uncached)
|
|
#define _PGMT_WB (1UL << PG_uncached | 1UL << PG_arch_1)
|
|
#define _PGMT_MASK (1UL << PG_uncached | 1UL << PG_arch_1)
|
|
#define _PGMT_CLEAR_MASK (~_PGMT_MASK)
|
|
|
|
static inline unsigned long get_page_memtype(struct page *pg)
|
|
{
|
|
unsigned long pg_flags = pg->flags & _PGMT_MASK;
|
|
|
|
if (pg_flags == _PGMT_DEFAULT)
|
|
return -1;
|
|
else if (pg_flags == _PGMT_WC)
|
|
return _PAGE_CACHE_WC;
|
|
else if (pg_flags == _PGMT_UC_MINUS)
|
|
return _PAGE_CACHE_UC_MINUS;
|
|
else
|
|
return _PAGE_CACHE_WB;
|
|
}
|
|
|
|
static inline void set_page_memtype(struct page *pg, unsigned long memtype)
|
|
{
|
|
unsigned long memtype_flags = _PGMT_DEFAULT;
|
|
unsigned long old_flags;
|
|
unsigned long new_flags;
|
|
|
|
switch (memtype) {
|
|
case _PAGE_CACHE_WC:
|
|
memtype_flags = _PGMT_WC;
|
|
break;
|
|
case _PAGE_CACHE_UC_MINUS:
|
|
memtype_flags = _PGMT_UC_MINUS;
|
|
break;
|
|
case _PAGE_CACHE_WB:
|
|
memtype_flags = _PGMT_WB;
|
|
break;
|
|
}
|
|
|
|
do {
|
|
old_flags = pg->flags;
|
|
new_flags = (old_flags & _PGMT_CLEAR_MASK) | memtype_flags;
|
|
} while (cmpxchg(&pg->flags, old_flags, new_flags) != old_flags);
|
|
}
|
|
#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 category, 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_wc(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_wc(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;
|
|
extern int kernel_set_to_readonly;
|
|
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 */
|