mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 22:06:44 +07:00
bb8985586b
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
#ifndef __ASM_X86_XSAVE_H
|
|
#define __ASM_X86_XSAVE_H
|
|
|
|
#include <linux/types.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/i387.h>
|
|
|
|
#define XSTATE_FP 0x1
|
|
#define XSTATE_SSE 0x2
|
|
|
|
#define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE)
|
|
|
|
#define FXSAVE_SIZE 512
|
|
|
|
/*
|
|
* These are the features that the OS can handle currently.
|
|
*/
|
|
#define XCNTXT_MASK (XSTATE_FP | XSTATE_SSE)
|
|
|
|
#ifdef CONFIG_X86_64
|
|
#define REX_PREFIX "0x48, "
|
|
#else
|
|
#define REX_PREFIX
|
|
#endif
|
|
|
|
extern unsigned int xstate_size;
|
|
extern u64 pcntxt_mask;
|
|
extern struct xsave_struct *init_xstate_buf;
|
|
|
|
extern void xsave_cntxt_init(void);
|
|
extern void xsave_init(void);
|
|
extern int init_fpu(struct task_struct *child);
|
|
extern int check_for_xstate(struct i387_fxsave_struct __user *buf,
|
|
void __user *fpstate,
|
|
struct _fpx_sw_bytes *sw);
|
|
|
|
static inline int xrstor_checking(struct xsave_struct *fx)
|
|
{
|
|
int err;
|
|
|
|
asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
|
|
"2:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
"3: movl $-1,%[err]\n"
|
|
" jmp 2b\n"
|
|
".previous\n"
|
|
_ASM_EXTABLE(1b, 3b)
|
|
: [err] "=r" (err)
|
|
: "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0)
|
|
: "memory");
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline int xsave_user(struct xsave_struct __user *buf)
|
|
{
|
|
int err;
|
|
__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n"
|
|
"2:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
"3: movl $-1,%[err]\n"
|
|
" jmp 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
_ASM_ALIGN "\n"
|
|
_ASM_PTR "1b,3b\n"
|
|
".previous"
|
|
: [err] "=r" (err)
|
|
: "D" (buf), "a" (-1), "d" (-1), "0" (0)
|
|
: "memory");
|
|
if (unlikely(err) && __clear_user(buf, xstate_size))
|
|
err = -EFAULT;
|
|
/* No need to clear here because the caller clears USED_MATH */
|
|
return err;
|
|
}
|
|
|
|
static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask)
|
|
{
|
|
int err;
|
|
struct xsave_struct *xstate = ((__force struct xsave_struct *)buf);
|
|
u32 lmask = mask;
|
|
u32 hmask = mask >> 32;
|
|
|
|
__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n"
|
|
"2:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
"3: movl $-1,%[err]\n"
|
|
" jmp 2b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
_ASM_ALIGN "\n"
|
|
_ASM_PTR "1b,3b\n"
|
|
".previous"
|
|
: [err] "=r" (err)
|
|
: "D" (xstate), "a" (lmask), "d" (hmask), "0" (0)
|
|
: "memory"); /* memory required? */
|
|
return err;
|
|
}
|
|
|
|
static inline void xrstor_state(struct xsave_struct *fx, u64 mask)
|
|
{
|
|
u32 lmask = mask;
|
|
u32 hmask = mask >> 32;
|
|
|
|
asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
|
|
: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
|
|
: "memory");
|
|
}
|
|
|
|
static inline void xsave(struct task_struct *tsk)
|
|
{
|
|
/* This, however, we can work around by forcing the compiler to select
|
|
an addressing mode that doesn't require extended registers. */
|
|
__asm__ __volatile__(".byte " REX_PREFIX "0x0f,0xae,0x27"
|
|
: : "D" (&(tsk->thread.xstate->xsave)),
|
|
"a" (-1), "d"(-1) : "memory");
|
|
}
|
|
#endif
|