diff options
| author | David Daney <ddaney@caviumnetworks.com> | 2010-01-23 01:41:15 +0300 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2010-02-27 14:53:13 +0300 |
| commit | 1b362e3e350f72c6cb4b3346f6ba92a529082a09 (patch) | |
| tree | de172b4853b1aaa6684e5b7afed679c88d8ab655 | |
| parent | 2a880986d899f556f5a327bc77cc8760d5bb9c64 (diff) | |
| download | linux-1b362e3e350f72c6cb4b3346f6ba92a529082a09.tar.xz | |
MIPS: Decode c0_config4 for large TLBs.
For processors that have more than 64 TLBs, we need to decode both
config1 and config4 to determine the total number TLBs.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/866/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/include/asm/mipsregs.h | 4 | ||||
| -rw-r--r-- | arch/mips/kernel/cpu-probe.c | 15 |
2 files changed, 19 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h index f4ab3139d737..edda1daf742f 100644 --- a/arch/mips/include/asm/mipsregs.h +++ b/arch/mips/include/asm/mipsregs.h @@ -576,6 +576,10 @@ #define MIPS_CONF3_DSP (_ULCAST_(1) << 10) #define MIPS_CONF3_ULRI (_ULCAST_(1) << 13) +#define MIPS_CONF4_MMUSIZEEXT (_ULCAST_(255) << 0) +#define MIPS_CONF4_MMUEXTDEF (_ULCAST_(3) << 14) +#define MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT (_ULCAST_(1) << 14) + #define MIPS_CONF7_WII (_ULCAST_(1) << 31) #define MIPS_CONF7_RPS (_ULCAST_(1) << 2) diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index 758ad426c57f..323395081b2a 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -700,6 +700,19 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c) return config3 & MIPS_CONF_M; } +static inline unsigned int decode_config4(struct cpuinfo_mips *c) +{ + unsigned int config4; + + config4 = read_c0_config4(); + + if ((config4 & MIPS_CONF4_MMUEXTDEF) == MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT + && cpu_has_tlb) + c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40; + + return config4 & MIPS_CONF_M; +} + static void __cpuinit decode_configs(struct cpuinfo_mips *c) { int ok; @@ -718,6 +731,8 @@ static void __cpuinit decode_configs(struct cpuinfo_mips *c) ok = decode_config2(c); if (ok) ok = decode_config3(c); + if (ok) + ok = decode_config4(c); mips_probe_watch_registers(c); } |