Commit-ID: a30469e7921a6dd2067e9e836d7787cfa0105627
Gitweb: http://git.kernel.org/tip/a30469e7921a6dd2067e9e836d7787cfa0105627
Author: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
AuthorDate: Fri, 10 Apr 2009 15:21:24 -0700
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Sun, 12 Apr 2009 13:08:56 +0200
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@xxxxxxxxx>
LKML-Reference: <1239402084.27006.8057.camel@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/include/asm/processor.h | 6 ++++++
arch/x86/include/asm/sigcontext.h | 6 ++++++
arch/x86/include/asm/xsave.h | 3 ++-
arch/x86/kernel/xsave.c | 2 +-
4 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 34c5237..fcf4d92 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -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)));
diff --git a/arch/x86/include/asm/sigcontext.h b/arch/x86/include/asm/sigcontext.h
index ec66649..72e5a44 100644
--- a/arch/x86/include/asm/sigcontext.h
+++ b/arch/x86/include/asm/sigcontext.h
@@ -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 */
};
diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h
index 08e9a1a..727acc1 100644
--- a/arch/x86/include/asm/xsave.h
+++ b/arch/x86/include/asm/xsave.h
@@ -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, "
diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 2b54fe0..0a5b04a 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -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();
--
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