xstate.c (2f2fcc40a961ed04f0e130803fbaa868c2899310) xstate.c (ad3bc25a320742f42b3015115384f5aec69c7ce2)
1/*
2 * xsave/xrstor support.
3 *
4 * Author: Suresh Siddha <suresh.b.siddha@intel.com>
5 */
6#include <linux/compat.h>
7#include <linux/cpu.h>
8#include <linux/mman.h>

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439{
440 u32 eax, ebx, ecx, edx;
441
442 /*
443 * Only XSAVES supports supervisor states and it uses compacted
444 * format. Checking a supervisor state's uncompacted offset is
445 * an error.
446 */
1/*
2 * xsave/xrstor support.
3 *
4 * Author: Suresh Siddha <suresh.b.siddha@intel.com>
5 */
6#include <linux/compat.h>
7#include <linux/cpu.h>
8#include <linux/mman.h>

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439{
440 u32 eax, ebx, ecx, edx;
441
442 /*
443 * Only XSAVES supports supervisor states and it uses compacted
444 * format. Checking a supervisor state's uncompacted offset is
445 * an error.
446 */
447 if (XFEATURE_MASK_SUPERVISOR & BIT_ULL(xfeature_nr)) {
447 if (XFEATURE_MASK_SUPERVISOR & (1 << xfeature_nr)) {
448 WARN_ONCE(1, "No fixed offset for xstate %d\n", xfeature_nr);
449 return -1;
450 }
451
452 CHECK_XFEATURE(xfeature_nr);
453 cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
454 return ebx;
455}

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803 if (boot_cpu_has(X86_FEATURE_XSAVE))
804 xsetbv(XCR_XFEATURE_ENABLED_MASK, xfeatures_mask);
805}
806
807/*
808 * Given an xstate feature mask, calculate where in the xsave
809 * buffer the state is. Callers should ensure that the buffer
810 * is valid.
448 WARN_ONCE(1, "No fixed offset for xstate %d\n", xfeature_nr);
449 return -1;
450 }
451
452 CHECK_XFEATURE(xfeature_nr);
453 cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
454 return ebx;
455}

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803 if (boot_cpu_has(X86_FEATURE_XSAVE))
804 xsetbv(XCR_XFEATURE_ENABLED_MASK, xfeatures_mask);
805}
806
807/*
808 * Given an xstate feature mask, calculate where in the xsave
809 * buffer the state is. Callers should ensure that the buffer
810 * is valid.
811 *
812 * Note: does not work for compacted buffers.
811 */
813 */
812void *__raw_xsave_addr(struct xregs_state *xsave, int xstate_feature_mask)
814static void *__raw_xsave_addr(struct xregs_state *xsave, int xstate_feature_mask)
813{
814 int feature_nr = fls64(xstate_feature_mask) - 1;
815
816 if (!xfeature_enabled(feature_nr)) {
817 WARN_ON_FPU(1);
818 return NULL;
819 }
820

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816 int feature_nr = fls64(xstate_feature_mask) - 1;
817
818 if (!xfeature_enabled(feature_nr)) {
819 WARN_ON_FPU(1);
820 return NULL;
821 }
822

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