cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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xcr.h (793B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_X86_FPU_XCR_H
      3#define _ASM_X86_FPU_XCR_H
      4
      5#define XCR_XFEATURE_ENABLED_MASK	0x00000000
      6#define XCR_XFEATURE_IN_USE_MASK	0x00000001
      7
      8static inline u64 xgetbv(u32 index)
      9{
     10	u32 eax, edx;
     11
     12	asm volatile("xgetbv" : "=a" (eax), "=d" (edx) : "c" (index));
     13	return eax + ((u64)edx << 32);
     14}
     15
     16static inline void xsetbv(u32 index, u64 value)
     17{
     18	u32 eax = value;
     19	u32 edx = value >> 32;
     20
     21	asm volatile("xsetbv" :: "a" (eax), "d" (edx), "c" (index));
     22}
     23
     24/*
     25 * Return a mask of xfeatures which are currently being tracked
     26 * by the processor as being in the initial configuration.
     27 *
     28 * Callers should check X86_FEATURE_XGETBV1.
     29 */
     30static inline u64 xfeatures_in_use(void)
     31{
     32	return xgetbv(XCR_XFEATURE_IN_USE_MASK);
     33}
     34
     35#endif /* _ASM_X86_FPU_XCR_H */