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[PATCH] i386: Retrieve CLFLUSH size from CPUID 

Also report it in /proc/cpuinfo similar to x86-64.

Needed for followon patch

Signed-off-by: Andi Kleen <ak@suse.de>
hifive-unleashed-5.1
Andi Kleen 2006-12-07 02:14:05 +01:00 committed by Andi Kleen
parent ea7322decb
commit 770d132f03
3 changed files with 6 additions and 1 deletions
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3
arch/i386/kernel/cpu/common.c
View File

@ -309,6 +309,8 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 * c)
#else
c->apicid = (ebx >> 24) & 0xFF;
#endif
if (c->x86_capability[0] & (1<<19))
c->x86_clflush_size = ((ebx >> 8) & 0xff) * 8;
} else {
/* Have CPUID level 0 only - unheard of */
c->x86 = 4;
@ -373,6 +375,7 @@ void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
c->x86_vendor_id[0] = '\0'; /* Unset */
c->x86_model_id[0] = '\0'; /* Unset */
c->x86_max_cores = 1;
c->x86_clflush_size = 32;
memset(&c->x86_capability, 0, sizeof c->x86_capability);
if (!have_cpuid_p()) {

3
arch/i386/kernel/cpu/proc.c
View File

@ -152,9 +152,10 @@ static int show_cpuinfo(struct seq_file *m, void *v)
seq_printf(m, " [%d]", i);
}
seq_printf(m, "\nbogomips\t: %lu.%02lu\n\n",
seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
c->loops_per_jiffy/(500000/HZ),
(c->loops_per_jiffy/(5000/HZ)) % 100);
seq_printf(m, "clflush size\t: %u\n\n", c->x86_clflush_size);
return 0;
}

1
include/asm-i386/processor.h
View File

@ -72,6 +72,7 @@ struct cpuinfo_x86 {
#endif
unsigned char x86_max_cores; /* cpuid returned max cores value */
unsigned char apicid;
unsigned short x86_clflush_size;
#ifdef CONFIG_SMP
unsigned char booted_cores; /* number of cores as seen by OS */
__u8 phys_proc_id; /* Physical processor id. */