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ARM: mm: Define set_memory_* functions for ARM

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Other architectures define various set_memory functions to allow
attributes to be changed (e.g. set_memory_x, set_memory_rw, etc.)
Currently, these functions are missing on ARM. Define these in an
appropriate manner for ARM.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Laura Abbott 2013-06-17 10:29:13 -07:00 committed by Russell King
parent 27ec8da4ac
commit 75374ad47c
2 changed files with 43 additions and 0 deletions
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5
arch/arm/include/asm/cacheflush.h
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@ -481,4 +481,9 @@ static inline void __sync_cache_range_r(volatile void *p, size_t size)
: : : "r0","r1","r2","r3","r4","r5","r6","r7", \
"r9","r10","lr","memory" )
int set_memory_ro(unsigned long addr, int numpages);
int set_memory_rw(unsigned long addr, int numpages);
int set_memory_x(unsigned long addr, int numpages);
int set_memory_nx(unsigned long addr, int numpages);
#endif

38
arch/arm/mm/mmu.c
View File

@ -345,6 +345,44 @@ const struct mem_type *get_mem_type(unsigned int type)
}
EXPORT_SYMBOL(get_mem_type);
#define PTE_SET_FN(_name, pteop) \
static int pte_set_##_name(pte_t *ptep, pgtable_t token, unsigned long addr, \
void *data) \
{ \
pte_t pte = pteop(*ptep); \
\
set_pte_ext(ptep, pte, 0); \
return 0; \
} \
#define SET_MEMORY_FN(_name, callback) \
int set_memory_##_name(unsigned long addr, int numpages) \
{ \
unsigned long start = addr; \
unsigned long size = PAGE_SIZE*numpages; \
unsigned end = start + size; \
\
if (start < MODULES_VADDR || start >= MODULES_END) \
return -EINVAL;\
\
if (end < MODULES_VADDR || end >= MODULES_END) \
return -EINVAL; \
\
apply_to_page_range(&init_mm, start, size, callback, NULL); \
flush_tlb_kernel_range(start, end); \
return 0;\
}
PTE_SET_FN(ro, pte_wrprotect)
PTE_SET_FN(rw, pte_mkwrite)
PTE_SET_FN(x, pte_mkexec)
PTE_SET_FN(nx, pte_mknexec)
SET_MEMORY_FN(ro, pte_set_ro)
SET_MEMORY_FN(rw, pte_set_rw)
SET_MEMORY_FN(x, pte_set_x)
SET_MEMORY_FN(nx, pte_set_nx)
/*
* Adjust the PMD section entries according to the CPU in use.
*/