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authorCatalin Marinas <catalin.marinas@arm.com>2007-05-09 09:50:23 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-05-09 09:50:23 +0100
commit065cf519c32984b7a78777aae3859baf5f5fd3d3 (patch)
treea6d0fe57cfacb76bd90189101977ec8e6bab3ec0
parent56163fcf194fb688fcf3cefa9b90c5ad41f74059 (diff)
[ARM] armv7: add support for asid-tagged VIVT I-cache
ARMv7 can have VIPT, PIPT or ASID-tagged VIVT I-cache. This patch adds the necessary invalidation of the I-cache when the ASID numbers are re-used. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/mm/context.c7
-rw-r--r--include/asm-arm/cacheflush.h15
2 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c
index 9da43a0fdcd..c9e9a558626 100644
--- a/arch/arm/mm/context.c
+++ b/arch/arm/mm/context.c
@@ -47,6 +47,13 @@ void __new_context(struct mm_struct *mm)
: "r" (0));
isb();
flush_tlb_all();
+ if (icache_is_vivt_asid_tagged()) {
+ asm("mcr p15, 0, %0, c7, c5, 0 @ invalidate I-cache\n"
+ "mcr p15, 0, %0, c7, c5, 6 @ flush BTAC/BTB\n"
+ :
+ : "r" (0));
+ dsb();
+ }
}
mm->context.id = asid;
diff --git a/include/asm-arm/cacheflush.h b/include/asm-arm/cacheflush.h
index 6832ef96bc1..d1294a46c70 100644
--- a/include/asm-arm/cacheflush.h
+++ b/include/asm-arm/cacheflush.h
@@ -438,6 +438,7 @@ static inline void flush_anon_page(struct vm_area_struct *vma,
#define __cacheid_vipt(val) (__cacheid_type_v7(val) ? 1 : __cacheid_vipt_prev7(val))
#define __cacheid_vipt_nonaliasing(val) (__cacheid_type_v7(val) ? 1 : __cacheid_vipt_nonaliasing_prev7(val))
#define __cacheid_vipt_aliasing(val) (__cacheid_type_v7(val) ? 0 : __cacheid_vipt_aliasing_prev7(val))
+#define __cacheid_vivt_asid_tagged_instr(val) (__cacheid_type_v7(val) ? ((val & (3 << 14)) == (1 << 14)) : 0)
#if defined(CONFIG_CPU_CACHE_VIVT) && !defined(CONFIG_CPU_CACHE_VIPT)
@@ -445,6 +446,7 @@ static inline void flush_anon_page(struct vm_area_struct *vma,
#define cache_is_vipt() 0
#define cache_is_vipt_nonaliasing() 0
#define cache_is_vipt_aliasing() 0
+#define icache_is_vivt_asid_tagged() 0
#elif defined(CONFIG_CPU_CACHE_VIPT)
@@ -462,6 +464,12 @@ static inline void flush_anon_page(struct vm_area_struct *vma,
__cacheid_vipt_aliasing(__val); \
})
+#define icache_is_vivt_asid_tagged() \
+ ({ \
+ unsigned int __val = read_cpuid(CPUID_CACHETYPE); \
+ __cacheid_vivt_asid_tagged_instr(__val); \
+ })
+
#else
#define cache_is_vivt() \
@@ -490,6 +498,13 @@ static inline void flush_anon_page(struct vm_area_struct *vma,
__cacheid_vipt_aliasing(__val); \
})
+#define icache_is_vivt_asid_tagged() \
+ ({ \
+ unsigned int __val = read_cpuid(CPUID_CACHETYPE); \
+ __cacheid_present(__val) && \
+ __cacheid_vivt_asid_tagged_instr(__val); \
+ })
+
#endif
#endif