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@xxxxxxxxxxxxxxxxxx>
---
This is the second version, it uses more symbolic values and fewer
magic numbers.
arch/mips/include/asm/mipsregs.h | 4 ++++
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 5c192a0..2cb1f0b 100644
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -564,6 +564,10 @@
#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 80e202e..b6a5c4a 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -691,6 +691,19 @@ 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;
@@ -709,6 +722,8 @@ 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);
}
--
1.6.0.6
