arm64: head: cover entire kernel image in initial ID map

[linux-2.6-microblaze.git] / arch / arm64 / include / asm / kernel-pgtable.h

diff --git a/arch/arm64/include/asm/kernel-pgtable.h b/arch/arm64/include/asm/kernel-pgtable.h
index 96dc0f7..5395e5a 100644 (file)
--- a/arch/arm64/include/asm/kernel-pgtable.h
+++ b/arch/arm64/include/asm/kernel-pgtable.h
@@ -35,10 +35,8 @@
  */
 #if ARM64_KERNEL_USES_PMD_MAPS
 #define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS - 1)
-#define IDMAP_PGTABLE_LEVELS   (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT) - 1)
 #else
 #define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS)
-#define IDMAP_PGTABLE_LEVELS   (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT))
 #endif
 
 
@@ -87,7 +85,13 @@
                        + EARLY_PUDS((vstart), (vend))  /* each PUD needs a next level page table */    \
                        + EARLY_PMDS((vstart), (vend))) /* each PMD needs a next level page table */
 #define INIT_DIR_SIZE (PAGE_SIZE * EARLY_PAGES(KIMAGE_VADDR, _end))
-#define IDMAP_DIR_SIZE         (IDMAP_PGTABLE_LEVELS * PAGE_SIZE)
+
+/* the initial ID map may need two extra pages if it needs to be extended */
+#if VA_BITS < 48
+#define INIT_IDMAP_DIR_SIZE    (INIT_DIR_SIZE + (2 * PAGE_SIZE))
+#else
+#define INIT_IDMAP_DIR_SIZE    INIT_DIR_SIZE
+#endif
 
 /* Initial memory map size */
 #if ARM64_KERNEL_USES_PMD_MAPS
@@ -107,9 +111,11 @@
 #define SWAPPER_PMD_FLAGS      (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
 
 #if ARM64_KERNEL_USES_PMD_MAPS
-#define SWAPPER_MM_MMUFLAGS    (PMD_ATTRINDX(MT_NORMAL) | SWAPPER_PMD_FLAGS)
+#define SWAPPER_RW_MMUFLAGS    (PMD_ATTRINDX(MT_NORMAL) | SWAPPER_PMD_FLAGS)
+#define SWAPPER_RX_MMUFLAGS    (SWAPPER_RW_MMUFLAGS | PMD_SECT_RDONLY)
 #else
-#define SWAPPER_MM_MMUFLAGS    (PTE_ATTRINDX(MT_NORMAL) | SWAPPER_PTE_FLAGS)
+#define SWAPPER_RW_MMUFLAGS    (PTE_ATTRINDX(MT_NORMAL) | SWAPPER_PTE_FLAGS)
+#define SWAPPER_RX_MMUFLAGS    (SWAPPER_RW_MMUFLAGS | PTE_RDONLY)
 #endif
 
 /*