forked from Minki/linux
d0f2dd1861
Add a missing inline annotation on a static function, in order to shut
up a bunch of warnings like:
In file included from arch/x86/crypto/camellia_aesni_avx_glue.c:23:0:
./arch/x86/include/asm/xsave.h:73:12: warning: ‘xsave_state_booting’ defined but not used [-Wunused-function]
static int xsave_state_booting(struct xsave_struct *fx, u64 mask)
^
In file included from arch/x86/crypto/camellia_aesni_avx2_glue.c:23:0:
./arch/x86/include/asm/xsave.h:73:12: warning: ‘xsave_state_booting’ defined but not used [-Wunused-function]
static int xsave_state_booting(struct xsave_struct *fx, u64 mask)
^
...
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1403000468-30094-1-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
263 lines
6.2 KiB
C
263 lines
6.2 KiB
C
#ifndef __ASM_X86_XSAVE_H
|
|
#define __ASM_X86_XSAVE_H
|
|
|
|
#include <linux/types.h>
|
|
#include <asm/processor.h>
|
|
|
|
#define XSTATE_CPUID 0x0000000d
|
|
|
|
#define XSTATE_FP 0x1
|
|
#define XSTATE_SSE 0x2
|
|
#define XSTATE_YMM 0x4
|
|
#define XSTATE_BNDREGS 0x8
|
|
#define XSTATE_BNDCSR 0x10
|
|
#define XSTATE_OPMASK 0x20
|
|
#define XSTATE_ZMM_Hi256 0x40
|
|
#define XSTATE_Hi16_ZMM 0x80
|
|
|
|
#define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE)
|
|
/* Bit 63 of XCR0 is reserved for future expansion */
|
|
#define XSTATE_EXTEND_MASK (~(XSTATE_FPSSE | (1ULL << 63)))
|
|
|
|
#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)
|
|
|
|
/* Supported features which support lazy state saving */
|
|
#define XSTATE_LAZY (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \
|
|
| XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM)
|
|
|
|
/* Supported features which require eager state saving */
|
|
#define XSTATE_EAGER (XSTATE_BNDREGS | XSTATE_BNDCSR)
|
|
|
|
/* All currently supported features */
|
|
#define XCNTXT_MASK (XSTATE_LAZY | XSTATE_EAGER)
|
|
|
|
#ifdef CONFIG_X86_64
|
|
#define REX_PREFIX "0x48, "
|
|
#else
|
|
#define REX_PREFIX
|
|
#endif
|
|
|
|
extern unsigned int xstate_size;
|
|
extern u64 pcntxt_mask;
|
|
extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
|
|
extern struct xsave_struct *init_xstate_buf;
|
|
|
|
extern void xsave_init(void);
|
|
extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
|
|
extern int init_fpu(struct task_struct *child);
|
|
|
|
/* These macros all use (%edi)/(%rdi) as the single memory argument. */
|
|
#define XSAVE ".byte " REX_PREFIX "0x0f,0xae,0x27"
|
|
#define XSAVEOPT ".byte " REX_PREFIX "0x0f,0xae,0x37"
|
|
#define XSAVES ".byte " REX_PREFIX "0x0f,0xc7,0x2f"
|
|
#define XRSTOR ".byte " REX_PREFIX "0x0f,0xae,0x2f"
|
|
#define XRSTORS ".byte " REX_PREFIX "0x0f,0xc7,0x1f"
|
|
|
|
#define xstate_fault ".section .fixup,\"ax\"\n" \
|
|
"3: movl $-1,%[err]\n" \
|
|
" jmp 2b\n" \
|
|
".previous\n" \
|
|
_ASM_EXTABLE(1b, 3b) \
|
|
: [err] "=r" (err)
|
|
|
|
/*
|
|
* This function is called only during boot time when x86 caps are not set
|
|
* up and alternative can not be used yet.
|
|
*/
|
|
static inline int xsave_state_booting(struct xsave_struct *fx, u64 mask)
|
|
{
|
|
u32 lmask = mask;
|
|
u32 hmask = mask >> 32;
|
|
int err = 0;
|
|
|
|
WARN_ON(system_state != SYSTEM_BOOTING);
|
|
|
|
if (boot_cpu_has(X86_FEATURE_XSAVES))
|
|
asm volatile("1:"XSAVES"\n\t"
|
|
"2:\n\t"
|
|
: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
|
|
: "memory");
|
|
else
|
|
asm volatile("1:"XSAVE"\n\t"
|
|
"2:\n\t"
|
|
: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
|
|
: "memory");
|
|
|
|
asm volatile(xstate_fault
|
|
: "0" (0)
|
|
: "memory");
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* This function is called only during boot time when x86 caps are not set
|
|
* up and alternative can not be used yet.
|
|
*/
|
|
static inline int xrstor_state_booting(struct xsave_struct *fx, u64 mask)
|
|
{
|
|
u32 lmask = mask;
|
|
u32 hmask = mask >> 32;
|
|
int err = 0;
|
|
|
|
WARN_ON(system_state != SYSTEM_BOOTING);
|
|
|
|
if (boot_cpu_has(X86_FEATURE_XSAVES))
|
|
asm volatile("1:"XRSTORS"\n\t"
|
|
"2:\n\t"
|
|
: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
|
|
: "memory");
|
|
else
|
|
asm volatile("1:"XRSTOR"\n\t"
|
|
"2:\n\t"
|
|
: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
|
|
: "memory");
|
|
|
|
asm volatile(xstate_fault
|
|
: "0" (0)
|
|
: "memory");
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Save processor xstate to xsave area.
|
|
*/
|
|
static inline int xsave_state(struct xsave_struct *fx, u64 mask)
|
|
{
|
|
u32 lmask = mask;
|
|
u32 hmask = mask >> 32;
|
|
int err = 0;
|
|
|
|
/*
|
|
* If xsaves is enabled, xsaves replaces xsaveopt because
|
|
* it supports compact format and supervisor states in addition to
|
|
* modified optimization in xsaveopt.
|
|
*
|
|
* Otherwise, if xsaveopt is enabled, xsaveopt replaces xsave
|
|
* because xsaveopt supports modified optimization which is not
|
|
* supported by xsave.
|
|
*
|
|
* If none of xsaves and xsaveopt is enabled, use xsave.
|
|
*/
|
|
alternative_input_2(
|
|
"1:"XSAVE,
|
|
"1:"XSAVEOPT,
|
|
X86_FEATURE_XSAVEOPT,
|
|
"1:"XSAVES,
|
|
X86_FEATURE_XSAVES,
|
|
[fx] "D" (fx), "a" (lmask), "d" (hmask) :
|
|
"memory");
|
|
asm volatile("2:\n\t"
|
|
xstate_fault
|
|
: "0" (0)
|
|
: "memory");
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Restore processor xstate from xsave area.
|
|
*/
|
|
static inline int xrstor_state(struct xsave_struct *fx, u64 mask)
|
|
{
|
|
int err = 0;
|
|
u32 lmask = mask;
|
|
u32 hmask = mask >> 32;
|
|
|
|
/*
|
|
* Use xrstors to restore context if it is enabled. xrstors supports
|
|
* compacted format of xsave area which is not supported by xrstor.
|
|
*/
|
|
alternative_input(
|
|
"1: " XRSTOR,
|
|
"1: " XRSTORS,
|
|
X86_FEATURE_XSAVES,
|
|
"D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
|
|
: "memory");
|
|
|
|
asm volatile("2:\n"
|
|
xstate_fault
|
|
: "0" (0)
|
|
: "memory");
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Save xstate context for old process during context switch.
|
|
*/
|
|
static inline void fpu_xsave(struct fpu *fpu)
|
|
{
|
|
xsave_state(&fpu->state->xsave, -1);
|
|
}
|
|
|
|
/*
|
|
* Restore xstate context for new process during context switch.
|
|
*/
|
|
static inline int fpu_xrstor_checking(struct xsave_struct *fx)
|
|
{
|
|
return xrstor_state(fx, -1);
|
|
}
|
|
|
|
/*
|
|
* Save xstate to user space xsave area.
|
|
*
|
|
* We don't use modified optimization because xrstor/xrstors might track
|
|
* a different application.
|
|
*
|
|
* We don't use compacted format xsave area for
|
|
* backward compatibility for old applications which don't understand
|
|
* compacted format of xsave area.
|
|
*/
|
|
static inline int xsave_user(struct xsave_struct __user *buf)
|
|
{
|
|
int err;
|
|
|
|
/*
|
|
* Clear the xsave header first, so that reserved fields are
|
|
* initialized to zero.
|
|
*/
|
|
err = __clear_user(&buf->xsave_hdr, sizeof(buf->xsave_hdr));
|
|
if (unlikely(err))
|
|
return -EFAULT;
|
|
|
|
__asm__ __volatile__(ASM_STAC "\n"
|
|
"1:"XSAVE"\n"
|
|
"2: " ASM_CLAC "\n"
|
|
xstate_fault
|
|
: "D" (buf), "a" (-1), "d" (-1), "0" (0)
|
|
: "memory");
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Restore xstate from user space xsave area.
|
|
*/
|
|
static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask)
|
|
{
|
|
int err = 0;
|
|
struct xsave_struct *xstate = ((__force struct xsave_struct *)buf);
|
|
u32 lmask = mask;
|
|
u32 hmask = mask >> 32;
|
|
|
|
__asm__ __volatile__(ASM_STAC "\n"
|
|
"1:"XRSTOR"\n"
|
|
"2: " ASM_CLAC "\n"
|
|
xstate_fault
|
|
: "D" (xstate), "a" (lmask), "d" (hmask), "0" (0)
|
|
: "memory"); /* memory required? */
|
|
return err;
|
|
}
|
|
|
|
void *get_xsave_addr(struct xsave_struct *xsave, int xstate);
|
|
void setup_xstate_comp(void);
|
|
|
|
#endif
|