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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-12-18 19:13:32 +0000
committerPaul Mackerras <paulus@samba.org>2008-12-21 14:21:16 +1100
commit7c03d653cd257793dc40520c94e229b5fd0578e7 (patch)
treec2beffddec486c47f8ec6df5c3b592c143380559 /arch/powerpc/include/asm/mmu.h
parent2ca8cf738907180e7fbda90f25f32b86feda609f (diff)
powerpc/mm: Introduce MMU features
We're soon running out of CPU features and I need to add some new ones for various MMU related bits, so this patch separates the MMU features from the CPU features. I moved over the 32-bit MMU related ones, added base features for MMU type families, but didn't move over any 64-bit only feature yet. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/include/asm/mmu.h')
-rw-r--r--arch/powerpc/include/asm/mmu.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index 4c0e1b4f975..dc8c0aef5e6 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -2,6 +2,47 @@
#define _ASM_POWERPC_MMU_H_
#ifdef __KERNEL__
+#include <asm/asm-compat.h>
+#include <asm/feature-fixups.h>
+
+/*
+ * MMU features bit definitions
+ */
+
+/*
+ * First half is MMU families
+ */
+#define MMU_FTR_HPTE_TABLE ASM_CONST(0x00000001)
+#define MMU_FTR_TYPE_8xx ASM_CONST(0x00000002)
+#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)
+
+/*
+ * This is individual features
+ */
+
+/* Enable use of high BAT registers */
+#define MMU_FTR_USE_HIGH_BATS ASM_CONST(0x00010000)
+
+/* Enable >32-bit physical addresses on 32-bit processor, only used
+ * by CONFIG_6xx currently as BookE supports that from day 1
+ */
+#define MMU_FTR_BIG_PHYS ASM_CONST(0x00020000)
+
+#ifndef __ASSEMBLY__
+#include <asm/cputable.h>
+
+static inline int mmu_has_feature(unsigned long feature)
+{
+ return (cur_cpu_spec->mmu_features & feature);
+}
+
+extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup;
+
+#endif /* !__ASSEMBLY__ */
+
+
#ifdef CONFIG_PPC64
/* 64-bit classic hash table MMU */
# include <asm/mmu-hash64.h>