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x86: add linux kernel support for YMM state 

Impact: save/restore Intel-AVX state properly between tasks

Intel Advanced Vector Extensions (AVX) introduce 256-bit vector processing
capability. More about AVX at http://software.intel.com/sites/avx

Add OS support for YMM state management using xsave/xrstor infrastructure
to support AVX.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <1239402084.27006.8057.camel@localhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Suresh Siddha 2009-04-10 15:21:24 -07:00 committed by Ingo Molnar
parent 1ee4bd92a7
commit a30469e792
4 changed files with 15 additions and 2 deletions
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6
arch/x86/include/asm/processor.h
View File

@ -352,6 +352,11 @@ struct i387_soft_struct {
u32 entry_eip;
};
struct ymmh_struct {
/* 16 * 16 bytes for each YMMH-reg = 256 bytes */
u32 ymmh_space[64];
};
struct xsave_hdr_struct {
u64 xstate_bv;
u64 reserved1[2];
@ -361,6 +366,7 @@ struct xsave_hdr_struct {
struct xsave_struct {
struct i387_fxsave_struct i387;
struct xsave_hdr_struct xsave_hdr;
struct ymmh_struct ymmh;
/* new processor state extensions will go here */
} __attribute__ ((packed, aligned (64)));

6
arch/x86/include/asm/sigcontext.h
View File

@ -269,6 +269,11 @@ struct _xsave_hdr {
__u64 reserved2[5];
};
struct _ymmh_state {
/* 16 * 16 bytes for each YMMH-reg */
__u32 ymmh_space[64];
};
/*
* Extended state pointed by the fpstate pointer in the sigcontext.
* In addition to the fpstate, information encoded in the xstate_hdr
@ -278,6 +283,7 @@ struct _xsave_hdr {
struct _xstate {
struct _fpstate fpstate;
struct _xsave_hdr xstate_hdr;
struct _ymmh_state ymmh;
/* new processor state extensions go here */
};

3
arch/x86/include/asm/xsave.h
View File

@ -7,6 +7,7 @@
#define XSTATE_FP 0x1
#define XSTATE_SSE 0x2
#define XSTATE_YMM 0x4
#define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE)
@ -15,7 +16,7 @@
/*
* These are the features that the OS can handle currently.
*/
#define XCNTXT_MASK (XSTATE_FP | XSTATE_SSE)
#define XCNTXT_MASK (XSTATE_FP | XSTATE_SSE | XSTATE_YMM)
#ifdef CONFIG_X86_64
#define REX_PREFIX "0x48, "

2
arch/x86/kernel/xsave.c
View File

@ -324,7 +324,7 @@ void __ref xsave_cntxt_init(void)
}
/*
* for now OS knows only about FP/SSE
* Support only the state known to OS.
*/
pcntxt_mask = pcntxt_mask & XCNTXT_MASK;
xsave_init();