[PATCH v3 3/3] X86, mpx: Intel MPX xstate feature definition

From: Qiaowei Ren
Date: Fri Dec 06 2013 - 19:18:09 EST


This patch defines xstate feature and extends struct xsave_hdr_struct
to support Intel MPX.

Signed-off-by: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
Signed-off-by: Xudong Hao <xudong.hao@xxxxxxxxx>
Signed-off-by: Liu Jinsong <jinsong.liu@xxxxxxxxx>
---
arch/x86/include/asm/processor.h | 12 ++++++++++++
arch/x86/include/asm/xsave.h | 6 +++++-
2 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 987c75e..2fe2e75 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -370,6 +370,15 @@ struct ymmh_struct {
u32 ymmh_space[64];
};

+struct bndregs_struct {
+ u64 bndregs[8];
+} __packed;
+
+struct bndcsr_struct {
+ u64 cfg_reg_u;
+ u64 status_reg;
+} __packed;
+
struct xsave_hdr_struct {
u64 xstate_bv;
u64 reserved1[2];
@@ -380,6 +389,9 @@ struct xsave_struct {
struct i387_fxsave_struct i387;
struct xsave_hdr_struct xsave_hdr;
struct ymmh_struct ymmh;
+ u8 lwp_area[128];
+ struct bndregs_struct bndregs;
+ struct bndcsr_struct bndcsr;
/* new processor state extensions will go here */
} __attribute__ ((packed, aligned (64)));

diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h
index 0415cda..5cd9de3 100644
--- a/arch/x86/include/asm/xsave.h
+++ b/arch/x86/include/asm/xsave.h
@@ -9,6 +9,8 @@
#define XSTATE_FP 0x1
#define XSTATE_SSE 0x2
#define XSTATE_YMM 0x4
+#define XSTATE_BNDREGS 0x8
+#define XSTATE_BNDCSR 0x10

#define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE)

@@ -20,10 +22,12 @@
#define XSAVE_YMM_SIZE 256
#define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)

+#define XSTATE_FLEXIBLE (XSTATE_FP | XSTATE_SSE | XSTATE_YMM)
+#define XSTATE_EAGER (XSTATE_BNDREGS | XSTATE_BNDCSR)
/*
* These are the features that the OS can handle currently.
*/
-#define XCNTXT_MASK (XSTATE_FP | XSTATE_SSE | XSTATE_YMM)
+#define XCNTXT_MASK (XSTATE_FLEXIBLE | XSTATE_EAGER)

#ifdef CONFIG_X86_64
#define REX_PREFIX "0x48, "
--
1.7.1

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