From e77c32fe284a4da1b4e0994890a4d3527812eb61 Mon Sep 17 00:00:00 2001 From: David Daney Date: Tue, 21 Dec 2010 14:19:09 -0800 Subject: [PATCH] MIPS: Probe for presence of KScratch registers. Probe c0_config4 for KScratch registers and report them in /proc/cpuinfo. Signed-off-by: David Daney To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/1877/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/cpu-info.h | 1 + arch/mips/kernel/cpu-probe.c | 2 ++ arch/mips/kernel/proc.c | 2 ++ 3 files changed, 5 insertions(+) diff --git a/arch/mips/include/asm/cpu-info.h b/arch/mips/include/asm/cpu-info.h index b39def3..c454550 100644 --- a/arch/mips/include/asm/cpu-info.h +++ b/arch/mips/include/asm/cpu-info.h @@ -78,6 +78,7 @@ struct cpuinfo_mips { unsigned int watch_reg_use_cnt; /* Usable by ptrace */ #define NUM_WATCH_REGS 4 u16 watch_reg_masks[NUM_WATCH_REGS]; + unsigned int kscratch_mask; /* Usable KScratch mask. */ } __attribute__((aligned(SMP_CACHE_BYTES))); extern struct cpuinfo_mips cpu_data[]; diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index 68dae7b..f65d4c8 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -739,6 +739,8 @@ static inline unsigned int decode_config4(struct cpuinfo_mips *c) && cpu_has_tlb) c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40; + c->kscratch_mask = (config4 >> 16) & 0xff; + return config4 & MIPS_CONF_M; } diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c index 4195abb..e309665 100644 --- a/arch/mips/kernel/proc.c +++ b/arch/mips/kernel/proc.c @@ -74,6 +74,8 @@ static int show_cpuinfo(struct seq_file *m, void *v) ); seq_printf(m, "shadow register sets\t: %d\n", cpu_data[n].srsets); + seq_printf(m, "kscratch registers\t: %d\n", + hweight8(cpu_data[n].kscratch_mask)); seq_printf(m, "core\t\t\t: %d\n", cpu_data[n].core); sprintf(fmt, "VCE%%c exceptions\t\t: %s\n", -- 2.7.4