ARM: implement highpte

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / include / asm / pgtable.h

diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 9655bce3d345255ae9e6eac29fe02bec8c9af28e..201ccaa11f61b1ff647b55e5ed12e52e2b74c32f 100644 (file)
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -262,10 +262,19 @@ extern struct page *empty_zero_page;
 #define pte_clear(mm,addr,ptep)        set_pte_ext(ptep, __pte(0), 0)
 #define pte_page(pte)          (pfn_to_page(pte_pfn(pte)))
 #define pte_offset_kernel(dir,addr)    (pmd_page_vaddr(*(dir)) + __pte_index(addr))
-#define pte_offset_map(dir,addr)       (pmd_page_vaddr(*(dir)) + __pte_index(addr))
-#define pte_offset_map_nested(dir,addr)        (pmd_page_vaddr(*(dir)) + __pte_index(addr))
-#define pte_unmap(pte)         do { } while (0)
-#define pte_unmap_nested(pte)  do { } while (0)
+
+#define pte_offset_map(dir,addr)       (__pte_map(dir, KM_PTE0) + __pte_index(addr))
+#define pte_offset_map_nested(dir,addr)        (__pte_map(dir, KM_PTE1) + __pte_index(addr))
+#define pte_unmap(pte)                 __pte_unmap(pte, KM_PTE0)
+#define pte_unmap_nested(pte)          __pte_unmap(pte, KM_PTE1)
+
+#ifndef CONFIG_HIGHPTE
+#define __pte_map(dir,km)      pmd_page_vaddr(*(dir))
+#define __pte_unmap(pte,km)    do { } while (0)
+#else
+#define __pte_map(dir,km)      ((pte_t *)kmap_atomic(pmd_page(*(dir)), km) + PTRS_PER_PTE)
+#define __pte_unmap(pte,km)    kunmap_atomic((pte - PTRS_PER_PTE), km)
+#endif
 
 #define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,pte,ext)