diff options
Diffstat (limited to 'arch/arm/kernel/setup.c')
| -rw-r--r-- | arch/arm/kernel/setup.c | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index d5231ae7355a..9fc483393bae 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -238,6 +238,34 @@ int cpu_architecture(void) return cpu_arch; } +static int cpu_has_aliasing_icache(unsigned int arch) +{ + int aliasing_icache; + unsigned int id_reg, num_sets, line_size; + + /* arch specifies the register format */ + switch (arch) { + case CPU_ARCH_ARMv7: + asm("mcr p15, 2, %1, c0, c0, 0 @ set CSSELR\n" + "isb\n" + "mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR" + : "=r" (id_reg) + : "r" (1)); + line_size = 4 << ((id_reg & 0x7) + 2); + num_sets = ((id_reg >> 13) & 0x7fff) + 1; + aliasing_icache = (line_size * num_sets) > PAGE_SIZE; + break; + case CPU_ARCH_ARMv6: + aliasing_icache = read_cpuid_cachetype() & (1 << 11); + break; + default: + /* I-cache aliases will be handled by D-cache aliasing code */ + aliasing_icache = 0; + } + + return aliasing_icache; +} + static void __init cacheid_init(void) { unsigned int cachetype = read_cpuid_cachetype(); @@ -249,10 +277,15 @@ static void __init cacheid_init(void) cacheid = CACHEID_VIPT_NONALIASING; if ((cachetype & (3 << 14)) == 1 << 14) cacheid |= CACHEID_ASID_TAGGED; - } else if (cachetype & (1 << 23)) + else if (cpu_has_aliasing_icache(CPU_ARCH_ARMv7)) + cacheid |= CACHEID_VIPT_I_ALIASING; + } else if (cachetype & (1 << 23)) { cacheid = CACHEID_VIPT_ALIASING; - else + } else { cacheid = CACHEID_VIPT_NONALIASING; + if (cpu_has_aliasing_icache(CPU_ARCH_ARMv6)) + cacheid |= CACHEID_VIPT_I_ALIASING; + } } else { cacheid = CACHEID_VIVT; } @@ -263,7 +296,7 @@ static void __init cacheid_init(void) cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown", cache_is_vivt() ? "VIVT" : icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" : - cache_is_vipt_aliasing() ? "VIPT aliasing" : + icache_is_vipt_aliasing() ? "VIPT aliasing" : cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown"); } |