[ARM] Add cache_is_xxxx() functions for cache type identification.

Add cache_is_xxxx() functions so we can easily identify the cache
type of the CPU we're running on.

diff --git a/include/asm-arm/system.h b/include/asm-arm/system.h
index d500cc940f812adb124a3871ab8589988295862e..146a814e53a2064b3fe2f282fb0d0a84f47af77e 100644 (file)
--- a/include/asm-arm/system.h
+++ b/include/asm-arm/system.h
@@ -55,6 +55,38 @@
                __val;                                                  \
        })
 
+#define __cacheid_present(val)         (val != read_cpuid(CPUID_ID))
+#define __cacheid_vivt(val)            ((val & (15 << 25)) != (14 << 25))
+#define __cacheid_vipt(val)            ((val & (15 << 25)) == (14 << 25))
+#define __cacheid_vipt_nonaliasing(val)        ((val & (15 << 25 | 1 << 23)) == (14 << 25))
+#define __cacheid_vipt_aliasing(val)   ((val & (15 << 25 | 1 << 23)) == (14 << 25 | 1 << 23))
+
+#define cache_is_vivt()                                                        \
+       ({                                                              \
+               unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
+               (!__cacheid_present(__val)) || __cacheid_vivt(__val);   \
+       })
+               
+#define cache_is_vipt()                                                        \
+       ({                                                              \
+               unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
+               __cacheid_present(__val) && __cacheid_vipt(__val);      \
+       })
+
+#define cache_is_vipt_nonaliasing()                                    \
+       ({                                                              \
+               unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
+               __cacheid_present(__val) &&                             \
+                __cacheid_vipt_nonaliasing(__val);                     \
+       })
+
+#define cache_is_vipt_aliasing()                                       \
+       ({                                                              \
+               unsigned int __val = read_cpuid(CPUID_CACHETYPE);       \
+               __cacheid_present(__val) &&                             \
+                __cacheid_vipt_aliasing(__val);                        \
+       })
+
 /*
  * This is used to ensure the compiler did actually allocate the register we
  * asked it for some inline assembly sequences.  Apparently we can't trust