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-rw-r--r--arch/arm/include/asm/cachetype.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/arm/include/asm/cachetype.h b/arch/arm/include/asm/cachetype.h
new file mode 100644
index 00000000000..d3a4c2cb9f2
--- /dev/null
+++ b/arch/arm/include/asm/cachetype.h
@@ -0,0 +1,52 @@
+#ifndef __ASM_ARM_CACHETYPE_H
+#define __ASM_ARM_CACHETYPE_H
+
+#define CACHEID_VIVT (1 << 0)
+#define CACHEID_VIPT_NONALIASING (1 << 1)
+#define CACHEID_VIPT_ALIASING (1 << 2)
+#define CACHEID_VIPT (CACHEID_VIPT_ALIASING|CACHEID_VIPT_NONALIASING)
+#define CACHEID_ASID_TAGGED (1 << 3)
+
+extern unsigned int cacheid;
+
+#define cache_is_vivt() cacheid_is(CACHEID_VIVT)
+#define cache_is_vipt() cacheid_is(CACHEID_VIPT)
+#define cache_is_vipt_nonaliasing() cacheid_is(CACHEID_VIPT_NONALIASING)
+#define cache_is_vipt_aliasing() cacheid_is(CACHEID_VIPT_ALIASING)
+#define icache_is_vivt_asid_tagged() cacheid_is(CACHEID_ASID_TAGGED)
+
+/*
+ * __LINUX_ARM_ARCH__ is the minimum supported CPU architecture
+ * Mask out support which will never be present on newer CPUs.
+ * - v6+ is never VIVT
+ * - v7+ VIPT never aliases
+ */
+#if __LINUX_ARM_ARCH__ >= 7
+#define __CACHEID_ARCH_MIN (CACHEID_VIPT_NONALIASING | CACHEID_ASID_TAGGED)
+#elif __LINUX_ARM_ARCH__ >= 6
+#define __CACHEID_ARCH_MIN (~CACHEID_VIVT)
+#else
+#define __CACHEID_ARCH_MIN (~0)
+#endif
+
+/*
+ * Mask out support which isn't configured
+ */
+#if defined(CONFIG_CPU_CACHE_VIVT) && !defined(CONFIG_CPU_CACHE_VIPT)
+#define __CACHEID_ALWAYS (CACHEID_VIVT)
+#define __CACHEID_NEVER (~CACHEID_VIVT)
+#elif !defined(CONFIG_CPU_CACHE_VIVT) && defined(CONFIG_CPU_CACHE_VIPT)
+#define __CACHEID_ALWAYS (0)
+#define __CACHEID_NEVER (CACHEID_VIVT)
+#else
+#define __CACHEID_ALWAYS (0)
+#define __CACHEID_NEVER (0)
+#endif
+
+static inline unsigned int __attribute__((pure)) cacheid_is(unsigned int mask)
+{
+ return (__CACHEID_ALWAYS & mask) |
+ (~__CACHEID_NEVER & __CACHEID_ARCH_MIN & mask & cacheid);
+}
+
+#endif