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Some features, like Intel MPX, work only if the kernel uses eagerfpu model. So we should force eagerfpu on unless the user has explicitly disabled it. Add definitions for Intel MPX and add it to the supported list. [ hpa: renamed XSTATE_FLEXIBLE to XSTATE_LAZY and added comments ] Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com> Link: http://lkml.kernel.org/r/9E0BE1322F2F2246BD820DA9FC397ADE014A6115@SHSMSX102.ccr.corp.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
#ifndef __ASM_X86_XSAVE_H
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#define __ASM_X86_XSAVE_H
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#include <linux/types.h>
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#include <asm/processor.h>
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#define XSTATE_CPUID 0x0000000d
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#define XSTATE_FP 0x1
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#define XSTATE_SSE 0x2
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#define XSTATE_YMM 0x4
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#define XSTATE_BNDREGS 0x8
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#define XSTATE_BNDCSR 0x10
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#define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE)
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#define FXSAVE_SIZE 512
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#define XSAVE_HDR_SIZE 64
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#define XSAVE_HDR_OFFSET FXSAVE_SIZE
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#define XSAVE_YMM_SIZE 256
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#define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)
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/* Supported features which support lazy state saving */
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#define XSTATE_LAZY (XSTATE_FP | XSTATE_SSE | XSTATE_YMM)
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/* Supported features which require eager state saving */
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#define XSTATE_EAGER (XSTATE_BNDREGS | XSTATE_BNDCSR)
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/* All currently supported features */
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#define XCNTXT_MASK (XSTATE_LAZY | XSTATE_EAGER)
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#ifdef CONFIG_X86_64
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#define REX_PREFIX "0x48, "
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#else
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#define REX_PREFIX
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#endif
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extern unsigned int xstate_size;
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extern u64 pcntxt_mask;
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extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
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extern struct xsave_struct *init_xstate_buf;
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extern void xsave_init(void);
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extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
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extern int init_fpu(struct task_struct *child);
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static inline int fpu_xrstor_checking(struct xsave_struct *fx)
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{
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int err;
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asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
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"2:\n"
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".section .fixup,\"ax\"\n"
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"3: movl $-1,%[err]\n"
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" jmp 2b\n"
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".previous\n"
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_ASM_EXTABLE(1b, 3b)
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: [err] "=r" (err)
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: "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0)
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: "memory");
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return err;
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}
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static inline int xsave_user(struct xsave_struct __user *buf)
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{
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int err;
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/*
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* Clear the xsave header first, so that reserved fields are
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* initialized to zero.
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*/
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err = __clear_user(&buf->xsave_hdr, sizeof(buf->xsave_hdr));
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if (unlikely(err))
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return -EFAULT;
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__asm__ __volatile__(ASM_STAC "\n"
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"1: .byte " REX_PREFIX "0x0f,0xae,0x27\n"
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"2: " ASM_CLAC "\n"
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".section .fixup,\"ax\"\n"
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"3: movl $-1,%[err]\n"
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" jmp 2b\n"
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".previous\n"
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_ASM_EXTABLE(1b,3b)
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: [err] "=r" (err)
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: "D" (buf), "a" (-1), "d" (-1), "0" (0)
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: "memory");
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return err;
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}
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static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask)
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{
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int err;
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struct xsave_struct *xstate = ((__force struct xsave_struct *)buf);
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u32 lmask = mask;
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u32 hmask = mask >> 32;
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__asm__ __volatile__(ASM_STAC "\n"
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"1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n"
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"2: " ASM_CLAC "\n"
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".section .fixup,\"ax\"\n"
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"3: movl $-1,%[err]\n"
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" jmp 2b\n"
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".previous\n"
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_ASM_EXTABLE(1b,3b)
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: [err] "=r" (err)
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: "D" (xstate), "a" (lmask), "d" (hmask), "0" (0)
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: "memory"); /* memory required? */
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return err;
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}
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static inline void xrstor_state(struct xsave_struct *fx, u64 mask)
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{
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u32 lmask = mask;
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u32 hmask = mask >> 32;
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asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
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: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
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: "memory");
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}
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static inline void xsave_state(struct xsave_struct *fx, u64 mask)
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{
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u32 lmask = mask;
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u32 hmask = mask >> 32;
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asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x27\n\t"
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: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
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: "memory");
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}
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static inline void fpu_xsave(struct fpu *fpu)
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{
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/* This, however, we can work around by forcing the compiler to select
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an addressing mode that doesn't require extended registers. */
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alternative_input(
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".byte " REX_PREFIX "0x0f,0xae,0x27",
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".byte " REX_PREFIX "0x0f,0xae,0x37",
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X86_FEATURE_XSAVEOPT,
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[fx] "D" (&fpu->state->xsave), "a" (-1), "d" (-1) :
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"memory");
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}
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#endif
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