arm64: add helper functions to read I-cache attributes

[linux-2.6-microblaze.git] / arch / arm64 / include / asm / cachetype.h

diff --git a/arch/arm64/include/asm/cachetype.h b/arch/arm64/include/asm/cachetype.h
index 7a2e076..4c631a0 100644 (file)
--- a/arch/arm64/include/asm/cachetype.h
+++ b/arch/arm64/include/asm/cachetype.h
@@ -39,6 +39,26 @@
 
 extern unsigned long __icache_flags;
 
+#define CCSIDR_EL1_LINESIZE_MASK       0x7
+#define CCSIDR_EL1_LINESIZE(x)         ((x) & CCSIDR_EL1_LINESIZE_MASK)
+
+#define CCSIDR_EL1_NUMSETS_SHIFT       13
+#define CCSIDR_EL1_NUMSETS_MASK                (0x7fff << CCSIDR_EL1_NUMSETS_SHIFT)
+#define CCSIDR_EL1_NUMSETS(x) \
+       (((x) & CCSIDR_EL1_NUMSETS_MASK) >> CCSIDR_EL1_NUMSETS_SHIFT)
+
+extern u64 __attribute_const__ icache_get_ccsidr(void);
+
+static inline int icache_get_linesize(void)
+{
+       return 16 << CCSIDR_EL1_LINESIZE(icache_get_ccsidr());
+}
+
+static inline int icache_get_numsets(void)
+{
+       return 1 + CCSIDR_EL1_NUMSETS(icache_get_ccsidr());
+}
+
 /*
  * Whilst the D-side always behaves as PIPT on AArch64, aliasing is
  * permitted in the I-cache.