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authorLaura Abbott <lauraa@codeaurora.org>2013-06-17 10:29:13 -0700
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-12-11 09:53:19 +0000
commit75374ad47c6465de6c098d7b913fe02d6131195c (patch)
treeade5f83cf6baea175e6380c986777f0b7979d940 /arch/arm/mm/mmu.c
parent27ec8da4ace46900a71b8462157aa2bc88ff5d2c (diff)
downloadlinux-75374ad47c6465de6c098d7b913fe02d6131195c.tar.bz2
ARM: mm: Define set_memory_* functions for ARM
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>
Diffstat (limited to 'arch/arm/mm/mmu.c')
-rw-r--r--arch/arm/mm/mmu.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 9ec715f12224..09033890c8b0 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -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.
*/