Probe Config3 for small page support. This will be useful to give clues
as to whether the PageGrain register exists.
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
---
arch/mips/include/asm/cpu-features.h | 4 ++++
arch/mips/include/asm/cpu.h | 1 +
arch/mips/kernel/cpu-probe.c | 2 ++
3 files changed, 7 insertions(+)
diff --git a/arch/mips/include/asm/cpu-features.h b/arch/mips/include/asm/cpu-features.h
index f25de771f7ed..9801ac982655 100644
--- a/arch/mips/include/asm/cpu-features.h
+++ b/arch/mips/include/asm/cpu-features.h
@@ -411,4 +411,8 @@
# define cpu_has_cdmm (cpu_data[0].options & MIPS_CPU_CDMM)
#endif
+#ifndef cpu_has_small_pages
+# define cpu_has_small_pages (cpu_data[0].options & MIPS_CPU_SP)
+#endif
+
#endif /* __ASM_CPU_FEATURES_H */
diff --git a/arch/mips/include/asm/cpu.h b/arch/mips/include/asm/cpu.h
index e46e40602af3..00424b630f27 100644
--- a/arch/mips/include/asm/cpu.h
+++ b/arch/mips/include/asm/cpu.h
@@ -382,6 +382,7 @@ enum cpu_type_enum {
#define MIPS_CPU_XPA 0x2000000000ull /* CPU supports Extended Physical Addressing */
#define MIPS_CPU_CDMM 0x4000000000ull /* CPU has Common Device Memory Map */
#define MIPS_CPU_BP_GHIST 0x8000000000ull /* R12K+ Branch Prediction Global History */
+#define MIPS_CPU_SP 0x10000000000ull /* Small (1KB) page support */
/*
* CPU ASE encodings
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index dbe0792fc9c1..4f716dd77734 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -524,6 +524,8 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c)
}
if (config3 & MIPS_CONF3_CDMM)
c->options |= MIPS_CPU_CDMM;
+ if (config3 & MIPS_CONF3_SP)
+ c->options |= MIPS_CPU_SP;
return config3 & MIPS_CONF_M;
}
--
2.3.6
