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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-07-29 10:29:19 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-30 19:49:24 +0200
commitdc1e35c6e95e8923cf1d3510438b63c600fee1e2 (patch)
tree4348f51f1bfdd124efd6d16dcc552bd4a148fdfb /arch/x86/kernel/i387.c
parenta648bf4632628c787abb0514277f2a231fca39ca (diff)
x86, xsave: enable xsave/xrstor on cpus with xsave support
Enables xsave/xrstor by turning on cr4.osxsave on cpu's which have the xsave support. For now, features that OS supports/enabled are FP and SSE. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/i387.c')
-rw-r--r--arch/x86/kernel/i387.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index eb9ddd8efb82..e22a9a9dce8a 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -61,6 +61,11 @@ void __init init_thread_xstate(void)
return;
}
+ if (cpu_has_xsave) {
+ xsave_cntxt_init();
+ return;
+ }
+
if (cpu_has_fxsr)
xstate_size = sizeof(struct i387_fxsave_struct);
#ifdef CONFIG_X86_32
@@ -83,6 +88,13 @@ void __cpuinit fpu_init(void)
write_cr0(oldcr0 & ~(X86_CR0_TS|X86_CR0_EM)); /* clear TS and EM */
+ /*
+ * Boot processor to setup the FP and extended state context info.
+ */
+ if (!smp_processor_id())
+ init_thread_xstate();
+ xsave_init();
+
mxcsr_feature_mask_init();
/* clean state in init */
current_thread_info()->status = 0;