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Commit aaa7be48 authored by James Hogan's avatar James Hogan Committed by Ralf Baechle
Browse files

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: default avatarJames 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: default avatarRalf Baechle <ralf@linux-mips.org>
parent 3c865dd9

arch/mips/include/asm/cpu-features.h

+4 −0
Original line number Diff line number Diff line
@@ -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 */

arch/mips/include/asm/cpu.h

+1 −0
Original line number Diff line number Diff line
@@ -384,6 +384,7 @@ 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

arch/mips/kernel/cpu-probe.c

+2 −0
Original line number Diff line number Diff line
@@ -538,6 +538,8 @@ 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;

}