Commit 130951cc authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
Browse files

[PATCH] x86_64: Support constant TSC feature in future AMD CPUs.



Based on the documentation recently posted by Richard Brunner.
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 2765130b
......@@ -910,6 +910,10 @@ static int __init init_amd(struct cpuinfo_x86 *c)
}
display_cacheinfo(c);
/* c->x86_power is 8000_0007 edx. Bit 8 is constant TSC */
if (c->x86_power & (1<<8))
set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
if (c->extended_cpuid_level >= 0x80000008) {
c->x86_max_cores = (cpuid_ecx(0x80000008) & 0xff) + 1;
if (c->x86_max_cores & (c->x86_max_cores - 1))
......@@ -1268,6 +1272,8 @@ static int show_cpuinfo(struct seq_file *m, void *v)
"ttp", /* thermal trip */
"tm",
"stc"
"?",
"constant_tsc",
};
......
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment