powerpc/mm/hash64: Map all the kernel regions in the same 0xc range

[linux-2.6-block.git] / arch / powerpc / include / asm / book3s / 64 / hash-4k.h

diff --git a/arch/powerpc/include/asm/book3s/64/hash-4k.h b/arch/powerpc/include/asm/book3s/64/hash-4k.h
index cf5ba52542992668a0141d21771ce75164b2228e..4c9dfd6254616fc632d9e0bfefd67859fee082af 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/hash-4k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-4k.h
@@ -2,10 +2,10 @@
 #ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H
 #define _ASM_POWERPC_BOOK3S_64_HASH_4K_H
 
-#define H_PTE_INDEX_SIZE  9
-#define H_PMD_INDEX_SIZE  7
-#define H_PUD_INDEX_SIZE  9
-#define H_PGD_INDEX_SIZE  9
+#define H_PTE_INDEX_SIZE  9  // size: 8B << 9 = 4KB, maps: 2^9 x   4KB =   2MB
+#define H_PMD_INDEX_SIZE  7  // size: 8B << 7 = 1KB, maps: 2^7 x   2MB = 256MB
+#define H_PUD_INDEX_SIZE  9  // size: 8B << 9 = 4KB, maps: 2^9 x 256MB = 128GB
+#define H_PGD_INDEX_SIZE  9  // size: 8B << 9 = 4KB, maps: 2^9 x 128GB =  64TB
 
 /*
  * Each context is 512TB. But on 4k we restrict our max TASK size to 64TB
@@ -13,6 +13,19 @@
  */
 #define MAX_EA_BITS_PER_CONTEXT                46
 
+/*
+ * Our page table limit us to 64TB. Hence for the kernel mapping,
+ * each MAP area is limited to 16 TB.
+ * The four map areas are:  linear mapping, vmap, IO and vmemmap
+ */
+#define H_KERN_MAP_SIZE                (ASM_CONST(1) << (MAX_EA_BITS_PER_CONTEXT - 2))
+
+/*
+ * Define the address range of the kernel non-linear virtual area
+ * 16TB
+ */
+#define H_KERN_VIRT_START      ASM_CONST(0xc000100000000000)
+
 #ifndef __ASSEMBLY__
 #define H_PTE_TABLE_SIZE       (sizeof(pte_t) << H_PTE_INDEX_SIZE)
 #define H_PMD_TABLE_SIZE       (sizeof(pmd_t) << H_PMD_INDEX_SIZE)