Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / include / asm / cachetype.h

diff --git a/kernel/arch/arm/include/asm/cachetype.h b/kernel/arch/arm/include/asm/cachetype.h
new file mode 100644 (file)
index 0000000..7ea7814
--- /dev/null
+++ b/kernel/arch/arm/include/asm/cachetype.h
@@ -0,0 +1,59 @@
+#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)
+#define CACHEID_VIPT_I_ALIASING                (1 << 4)
+#define CACHEID_PIPT                   (1 << 5)
+
+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)
+#define icache_is_vipt_aliasing()      cacheid_is(CACHEID_VIPT_I_ALIASING)
+#define icache_is_pipt()               cacheid_is(CACHEID_PIPT)
+
+/*
+ * __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 on D-side
+ */
+#if __LINUX_ARM_ARCH__ >= 7
+#define __CACHEID_ARCH_MIN     (CACHEID_VIPT_NONALIASING |\
+                                CACHEID_ASID_TAGGED |\
+                                CACHEID_VIPT_I_ALIASING |\
+                                CACHEID_PIPT)
+#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