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x86, xsave: struct _fpstate extensions to include extended state information

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Bytes 464..511 in the current 512byte layout of fxsave/fxrstor
frame, are reserved for SW usage. On cpu's supporting xsave/xrstor, these bytes
are used to extended the fpstate pointer in the sigcontext, which now includes
the extended state information along with fpstate information.

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>
This commit is contained in:
Suresh Siddha
2008-07-29 10:29:24 -07:00
committed by Ingo Molnar
parent 9dc89c0f96
commit bdd8caba5e
3 changed files with 94 additions and 6 deletions
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7
include/asm-x86/processor.h
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@@ -322,7 +322,12 @@ struct i387_fxsave_struct {
/* 16*16 bytes for each XMM-reg = 256 bytes: */
u32 xmm_space[64];
u32 padding[24];
u32 padding[12];
union {
u32 padding1[12];
u32 sw_reserved[12];
};
} __attribute__((aligned(16)));