diff options
Diffstat (limited to 'arch/x86/power/cpu_32.c')
| -rw-r--r-- | arch/x86/power/cpu_32.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/x86/power/cpu_32.c b/arch/x86/power/cpu_32.c index 7dc5d5cf50a..274d06082f4 100644 --- a/arch/x86/power/cpu_32.c +++ b/arch/x86/power/cpu_32.c @@ -11,6 +11,7 @@ #include <linux/suspend.h> #include <asm/mtrr.h> #include <asm/mce.h> +#include <asm/xcr.h> static struct saved_context saved_context; @@ -45,7 +46,7 @@ static void __save_processor_state(struct saved_context *ctxt) ctxt->cr0 = read_cr0(); ctxt->cr2 = read_cr2(); ctxt->cr3 = read_cr3(); - ctxt->cr4 = read_cr4(); + ctxt->cr4 = read_cr4_safe(); } /* Needed by apm.c */ @@ -98,7 +99,9 @@ static void __restore_processor_state(struct saved_context *ctxt) /* * control registers */ - write_cr4(ctxt->cr4); + /* cr4 was introduced in the Pentium CPU */ + if (ctxt->cr4) + write_cr4(ctxt->cr4); write_cr3(ctxt->cr3); write_cr2(ctxt->cr2); write_cr0(ctxt->cr0); @@ -124,6 +127,12 @@ static void __restore_processor_state(struct saved_context *ctxt) if (boot_cpu_has(X86_FEATURE_SEP)) enable_sep_cpu(); + /* + * restore XCR0 for xsave capable cpu's. + */ + if (cpu_has_xsave) + xsetbv(XCR_XFEATURE_ENABLED_MASK, pcntxt_mask); + fix_processor_context(); do_fpu_end(); mtrr_ap_init(); |