ARM: mm: Define set_memory_* functions for ARM

[~andy/linux] / arch / arm / mm / mmu.c

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 9ec715f1222475c407f3e5070989bafc7c9967b2..09033890c8b0bd033721a4bbfb56a25b4c7db203 100644 (file)
--- 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.
  */