summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/include/asm/mmu.h
diff options
context:
space:
mode:
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-07-28 11:59:34 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-20 10:25:06 +1000
commit57e2a99f74b0d3720c97a6aadb57ae6aad3c61ea (patch)
tree4268a98ad222dbcf790749aed52417eb0a3a2a35 /arch/powerpc/include/asm/mmu.h
parent0257c99cdfaca53a881339e1cbca638c61569b05 (diff)
powerpc: Add memory management headers for new 64-bit BookE
This adds the PTE and pgtable format definitions, along with changes to the kernel memory map and other definitions related to implementing support for 64-bit Book3E. This also shields some asm-offset bits that are currently only relevant on 32-bit We also move the definition of the "linux" page size constants to the common mmu.h file and add a few sizes that are relevant to embedded processors. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/mmu.h')
-rw-r--r--arch/powerpc/include/asm/mmu.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index fb57ded592f..2fcfefc6089 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -17,6 +17,7 @@
#define MMU_FTR_TYPE_40x ASM_CONST(0x00000004)
#define MMU_FTR_TYPE_44x ASM_CONST(0x00000008)
#define MMU_FTR_TYPE_FSL_E ASM_CONST(0x00000010)
+#define MMU_FTR_TYPE_3E ASM_CONST(0x00000020)
/*
* This is individual features
@@ -73,6 +74,41 @@ extern void early_init_mmu_secondary(void);
#endif /* !__ASSEMBLY__ */
+/* The kernel use the constants below to index in the page sizes array.
+ * The use of fixed constants for this purpose is better for performances
+ * of the low level hash refill handlers.
+ *
+ * A non supported page size has a "shift" field set to 0
+ *
+ * Any new page size being implemented can get a new entry in here. Whether
+ * the kernel will use it or not is a different matter though. The actual page
+ * size used by hugetlbfs is not defined here and may be made variable
+ *
+ * Note: This array ended up being a false good idea as it's growing to the
+ * point where I wonder if we should replace it with something different,
+ * to think about, feedback welcome. --BenH.
+ */
+
+/* There are #define as they have to be used in assembly
+ *
+ * WARNING: If you change this list, make sure to update the array of
+ * names currently in arch/powerpc/mm/hugetlbpage.c or bad things will
+ * happen
+ */
+#define MMU_PAGE_4K 0
+#define MMU_PAGE_16K 1
+#define MMU_PAGE_64K 2
+#define MMU_PAGE_64K_AP 3 /* "Admixed pages" (hash64 only) */
+#define MMU_PAGE_256K 4
+#define MMU_PAGE_1M 5
+#define MMU_PAGE_8M 6
+#define MMU_PAGE_16M 7
+#define MMU_PAGE_256M 8
+#define MMU_PAGE_1G 9
+#define MMU_PAGE_16G 10
+#define MMU_PAGE_64G 11
+#define MMU_PAGE_COUNT 12
+
#if defined(CONFIG_PPC_STD_MMU_64)
/* 64-bit classic hash table MMU */
@@ -94,5 +130,6 @@ extern void early_init_mmu_secondary(void);
# include <asm/mmu-8xx.h>
#endif
+
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_MMU_H_ */