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Diffstat (limited to 'arch/x86/include/asm/xsave.h')
-rw-r--r--arch/x86/include/asm/xsave.h45
1 files changed, 37 insertions, 8 deletions
diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h
index ddc04ccad03b..c6ce2452f10c 100644
--- a/arch/x86/include/asm/xsave.h
+++ b/arch/x86/include/asm/xsave.h
@@ -3,7 +3,8 @@
#include <linux/types.h>
#include <asm/processor.h>
-#include <asm/i387.h>
+
+#define XSTATE_CPUID 0x0000000d
#define XSTATE_FP 0x1
#define XSTATE_SSE 0x2
@@ -13,6 +14,12 @@
#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)
+
/*
* These are the features that the OS can handle currently.
*/
@@ -26,10 +33,8 @@
extern unsigned int xstate_size;
extern u64 pcntxt_mask;
-extern struct xsave_struct *init_xstate_buf;
extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
-extern void xsave_cntxt_init(void);
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);
@@ -37,8 +42,9 @@ 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)
+static inline int fpu_xrstor_checking(struct fpu *fpu)
{
+ struct xsave_struct *fx = &fpu->state->xsave;
int err;
asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
@@ -58,6 +64,16 @@ static inline int xrstor_checking(struct xsave_struct *fx)
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(struct xsave_hdr_struct));
+ if (unlikely(err))
+ return -EFAULT;
+
__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n"
"2:\n"
".section .fixup,\"ax\"\n"
@@ -110,12 +126,25 @@ static inline void xrstor_state(struct xsave_struct *fx, u64 mask)
: "memory");
}
-static inline void xsave(struct task_struct *tsk)
+static inline void xsave_state(struct xsave_struct *fx, u64 mask)
+{
+ u32 lmask = mask;
+ u32 hmask = mask >> 32;
+
+ asm volatile(".byte " REX_PREFIX "0x0f,0xae,0x27\n\t"
+ : : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
+ : "memory");
+}
+
+static inline void fpu_xsave(struct fpu *fpu)
{
/* 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");
+ alternative_input(
+ ".byte " REX_PREFIX "0x0f,0xae,0x27",
+ ".byte " REX_PREFIX "0x0f,0xae,0x37",
+ X86_FEATURE_XSAVEOPT,
+ [fx] "D" (&fpu->state->xsave), "a" (-1), "d" (-1) :
+ "memory");
}
#endif