1 files changed, 96 insertions, 0 deletions
diff --git a/arch/arm/include/asm/cachetype.h b/arch/arm/include/asm/cachetype.h
new file mode 100644
index 000000000000..b52386bfd505
--- /dev/null
+++ b/arch/arm/include/asm/cachetype.h
@@ -0,0 +1,96 @@
+#ifndef __ASM_ARM_CACHETYPE_H
+#define __ASM_ARM_CACHETYPE_H
+
+#include <asm/cputype.h>
+
+#define __cacheid_present(val)			(val != read_cpuid_id())
+#define __cacheid_type_v7(val)			((val & (7 << 29)) == (4 << 29))
+
+#define __cacheid_vivt_prev7(val)		((val & (15 << 25)) != (14 << 25))
+#define __cacheid_vipt_prev7(val)		((val & (15 << 25)) == (14 << 25))
+#define __cacheid_vipt_nonaliasing_prev7(val)	((val & (15 << 25 | 1 << 23)) == (14 << 25))
+#define __cacheid_vipt_aliasing_prev7(val)	((val & (15 << 25 | 1 << 23)) == (14 << 25 | 1 << 23))
+
+#define __cacheid_vivt(val)			(__cacheid_type_v7(val) ? 0 : __cacheid_vivt_prev7(val))
+#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)
+/*
+ * VIVT caches only
+ */
+#define cache_is_vivt()			1
+#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_VIVT) && defined(CONFIG_CPU_CACHE_VIPT)
+/*
+ * VIPT caches only
+ */
+#define cache_is_vivt()			0
+#define cache_is_vipt()			1
+#define cache_is_vipt_nonaliasing()					\
+	({								\
+		unsigned int __val = read_cpuid_cachetype();		\
+		__cacheid_vipt_nonaliasing(__val);			\
+	})
+
+#define cache_is_vipt_aliasing()					\
+	({								\
+		unsigned int __val = read_cpuid_cachetype();		\
+		__cacheid_vipt_aliasing(__val);				\
+	})
+
+#define icache_is_vivt_asid_tagged()					\
+	({								\
+		unsigned int __val = read_cpuid_cachetype();		\
+		__cacheid_vivt_asid_tagged_instr(__val);		\
+	})
+
+#else
+/*
+ * VIVT or VIPT caches.  Note that this is unreliable since ARM926
+ * and V6 CPUs satisfy the "(val & (15 << 25)) == (14 << 25)" test.
+ * There's no way to tell from the CacheType register what type (!)
+ * the cache is.
+ */
+#define cache_is_vivt()							\
+	({								\
+		unsigned int __val = read_cpuid_cachetype();		\
+		(!__cacheid_present(__val)) || __cacheid_vivt(__val);	\
+	})
+
+#define cache_is_vipt()							\
+	({								\
+		unsigned int __val = read_cpuid_cachetype();		\
+		__cacheid_present(__val) && __cacheid_vipt(__val);	\
+	})
+
+#define cache_is_vipt_nonaliasing()					\
+	({								\
+		unsigned int __val = read_cpuid_cachetype();		\
+		__cacheid_present(__val) &&				\
+		 __cacheid_vipt_nonaliasing(__val);			\
+	})
+
+#define cache_is_vipt_aliasing()					\
+	({								\
+		unsigned int __val = read_cpuid_cachetype();		\
+		__cacheid_present(__val) &&				\
+		 __cacheid_vipt_aliasing(__val);			\
+	})
+
+#define icache_is_vivt_asid_tagged()					\
+	({								\
+		unsigned int __val = read_cpuid_cachetype();		\
+		__cacheid_present(__val) &&				\
+		 __cacheid_vivt_asid_tagged_instr(__val);		\
+	})
+
+#endif
+
+#endif