summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/fpu/xstate.h
blob: 7e42b285c8562009510abd84d0e071e7ff084030 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_X86_XSAVE_H
#define __ASM_X86_XSAVE_H

#include <linux/uaccess.h>
#include <linux/types.h>

#include <asm/processor.h>
#include <asm/user.h>

/* Bit 63 of XCR0 is reserved for future expansion */
#define XFEATURE_MASK_EXTEND	(~(XFEATURE_MASK_FPSSE | (1ULL << 63)))

#define XSTATE_CPUID		0x0000000d

#define FXSAVE_SIZE	512

#define XSAVE_HDR_SIZE	    64
#define XSAVE_HDR_OFFSET    FXSAVE_SIZE

#define XSAVE_YMM_SIZE	    256
#define XSAVE_YMM_OFFSET    (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)

/* Supervisor features */
#define XFEATURE_MASK_SUPERVISOR (XFEATURE_MASK_PT)

/* All currently supported features */
#define XCNTXT_MASK		(XFEATURE_MASK_FP | \
				 XFEATURE_MASK_SSE | \
				 XFEATURE_MASK_YMM | \
				 XFEATURE_MASK_OPMASK | \
				 XFEATURE_MASK_ZMM_Hi256 | \
				 XFEATURE_MASK_Hi16_ZMM	 | \
				 XFEATURE_MASK_PKRU | \
				 XFEATURE_MASK_BNDREGS | \
				 XFEATURE_MASK_BNDCSR)

#ifdef CONFIG_X86_64
#define REX_PREFIX	"0x48, "
#else
#define REX_PREFIX
#endif

extern u64 xfeatures_mask;
extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];

extern void __init update_regset_xstate_info(unsigned int size,
					     u64 xstate_mask);

void fpu__xstate_clear_all_cpu_caps(void);
void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr);
const void *get_xsave_field_ptr(int xfeature_nr);
int using_compacted_format(void);
int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf);
int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf);

/* Validate an xstate header supplied by userspace (ptrace or sigreturn) */
extern int validate_xstate_header(const struct xstate_header *hdr);

#endif