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| author | Suresh Siddha | 2008-07-29 19:29:25 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2008-07-30 19:49:27 +0200 |
| commit | c37b5efea43f9e500363f9973dd00e3d2cdcc685 (patch) | |
| tree | 9ce635f1672099dafcd78e535b4ea18d80235d8f /include/asm-x86/xsave.h | |
| parent | x86, xsave: struct _fpstate extensions to include extended state information (diff) | |
| download | kernel-qcow2-linux-c37b5efea43f9e500363f9973dd00e3d2cdcc685.tar.gz kernel-qcow2-linux-c37b5efea43f9e500363f9973dd00e3d2cdcc685.tar.xz kernel-qcow2-linux-c37b5efea43f9e500363f9973dd00e3d2cdcc685.zip | |
x86, xsave: save/restore the extended state context in sigframe
On cpu's supporting xsave/xrstor, fpstate pointer in the sigcontext, will
include the extended state information along with fpstate information. Presence
of extended state information is indicated by the presence
of FP_XSTATE_MAGIC1 at fpstate.sw_reserved.magic1 and FP_XSTATE_MAGIC2
at fpstate + (fpstate.sw_reserved.extended_size - FP_XSTATE_MAGIC2_SIZE).
Extended feature bit mask that is saved in the memory layout is represented
by the fpstate.sw_reserved.xstate_bv
For RT signal frames, UC_FP_XSTATE in the uc_flags also indicate the
presence of extended state information in the sigcontext's fpstate
pointer.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86/xsave.h')
| -rw-r--r-- | include/asm-x86/xsave.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/asm-x86/xsave.h b/include/asm-x86/xsave.h index b716511aede2..b7f64b9fcd94 100644 --- a/include/asm-x86/xsave.h +++ b/include/asm-x86/xsave.h @@ -29,6 +29,9 @@ 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) { @@ -48,7 +51,7 @@ static inline int xrstor_checking(struct xsave_struct *fx) return err; } -static inline int xsave_check(struct xsave_struct __user *buf) +static inline int xsave_user(struct xsave_struct __user *buf) { int err; __asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n" |