arm64: mm: Implement 4 levels of translation tables

[linux-2.6-block.git] / arch / arm64 / include / asm / page.h

diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h
index 46bf66628b6a69f00e1c866c68e134cb32b3ff69..cf9afa0366b67da615ef80b2929954fa076db0b3 100644 (file)
--- a/arch/arm64/include/asm/page.h
+++ b/arch/arm64/include/asm/page.h
@@ -31,12 +31,28 @@
 /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
 #define __HAVE_ARCH_GATE_AREA          1
 
+/*
+ * The idmap and swapper page tables need some space reserved in the kernel
+ * image. Both require pgd, pud (4 levels only) and pmd tables to (section)
+ * map the kernel. The swapper also maps the FDT (see __create_page_tables for
+ * more information).
+ */
+#ifdef CONFIG_ARM64_4_LEVELS
+#define SWAPPER_DIR_SIZE       (3 * PAGE_SIZE)
+#define IDMAP_DIR_SIZE         (3 * PAGE_SIZE)
+#else
+#define SWAPPER_DIR_SIZE       (2 * PAGE_SIZE)
+#define IDMAP_DIR_SIZE         (2 * PAGE_SIZE)
+#endif
+
 #ifndef __ASSEMBLY__
 
-#ifdef CONFIG_ARM64_64K_PAGES
+#ifdef CONFIG_ARM64_2_LEVELS
 #include <asm/pgtable-2level-types.h>
-#else
+#elif defined(CONFIG_ARM64_3_LEVELS)
 #include <asm/pgtable-3level-types.h>
+#else
+#include <asm/pgtable-4level-types.h>
 #endif
 
 extern void __cpu_clear_user_page(void *p, unsigned long user);