[ARM] Introduce new bitmask based cache type macros

[linux-2.6-omap-h63xx.git] / arch / arm / kernel / setup.c

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 1939c904dae34deddc46dbdd1b15af2a7e659169..5b121d81f9eb375c5a2e3262ba65f18b296cfaa5 100644 (file)
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -67,6 +67,8 @@ unsigned int processor_id;
 EXPORT_SYMBOL(processor_id);
 unsigned int __machine_arch_type;
 EXPORT_SYMBOL(__machine_arch_type);
+unsigned int cacheid;
+EXPORT_SYMBOL(cacheid);
 
 unsigned int __atags_pointer __initdata;
 
@@ -229,6 +231,25 @@ int cpu_architecture(void)
        return cpu_arch;
 }
 
+static void __init cacheid_init(void)
+{
+       unsigned int cachetype = read_cpuid_cachetype();
+       unsigned int arch = cpu_architecture();
+
+       if (arch >= CPU_ARCH_ARMv7) {
+               cacheid = CACHEID_VIPT_NONALIASING;
+               if ((cachetype & (3 << 14)) == 1 << 14)
+                       cacheid |= CACHEID_ASID_TAGGED;
+       } else if (arch >= CPU_ARCH_ARMv6) {
+               if (cachetype & (1 << 23))
+                       cacheid = CACHEID_VIPT_ALIASING;
+               else
+                       cacheid = CACHEID_VIPT_NONALIASING;
+       } else {
+               cacheid = CACHEID_VIVT;
+       }
+}
+
 /*
  * These functions re-use the assembly code in head.S, which
  * already provide the required functionality.
@@ -278,6 +299,7 @@ static void __init setup_processor(void)
        elf_hwcap &= ~HWCAP_THUMB;
 #endif
 
+       cacheid_init();
        cpu_proc_init();
 }