MIPS: Probe for small (1KiB) page support
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@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10722/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/include/asm/cpu-features.h b/arch/mips/include/asm/cpu-features.h
index f25de77..9801ac9 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 5fa7b8b..cd89e98 100644
--- a/arch/mips/include/asm/cpu.h
+++ b/arch/mips/include/asm/cpu.h
@@ -384,6 +384,7 @@
#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 4e39b34..9870367 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -538,6 +538,8 @@
}
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;
}