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x86/fpu: Clean up asm/fpu/types.h 

- add header guards

 - standardize vertical alignment

 - add comments about MPX

No code changed.

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-04-22 10:17:06 +02:00
parent 14b9675ae9
commit 47bc510634
1 changed files with 30 additions and 20 deletions
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50
arch/x86/include/asm/fpu/types.h
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@ -1,3 +1,8 @@
/*
* FPU data structures:
*/
#ifndef _ASM_X86_FPU_H
#define _ASM_X86_FPU_H
#define MXCSR_DEFAULT 0x1f80 #define MXCSR_DEFAULT 0x1f80
@ -52,6 +57,9 @@ struct i387_fxsave_struct {
} __attribute__((aligned(16))); } __attribute__((aligned(16)));
/*
* Software based FPU emulation state:
*/
struct i387_soft_struct { struct i387_soft_struct {
u32 cwd; u32 cwd;
u32 swd; u32 swd;
@ -74,38 +82,39 @@ struct i387_soft_struct {
struct ymmh_struct { struct ymmh_struct {
/* 16 * 16 bytes for each YMMH-reg = 256 bytes */ /* 16 * 16 bytes for each YMMH-reg = 256 bytes */
u32 ymmh_space[64]; u32 ymmh_space[64];
}; };
/* We don't support LWP yet: */ /* We don't support LWP yet: */
struct lwp_struct { struct lwp_struct {
u8 reserved[128]; u8 reserved[128];
}; };
/* Intel MPX support: */
struct bndreg { struct bndreg {
u64 lower_bound; u64 lower_bound;
u64 upper_bound; u64 upper_bound;
} __packed; } __packed;
struct bndcsr { struct bndcsr {
u64 bndcfgu; u64 bndcfgu;
u64 bndstatus; u64 bndstatus;
} __packed; } __packed;
struct xsave_hdr_struct { struct xsave_hdr_struct {
u64 xstate_bv; u64 xstate_bv;
u64 xcomp_bv; u64 xcomp_bv;
u64 reserved[6]; u64 reserved[6];
} __attribute__((packed)); } __attribute__((packed));
struct xsave_struct { struct xsave_struct {
struct i387_fxsave_struct i387; struct i387_fxsave_struct i387;
struct xsave_hdr_struct xsave_hdr; struct xsave_hdr_struct xsave_hdr;
struct ymmh_struct ymmh; struct ymmh_struct ymmh;
struct lwp_struct lwp; struct lwp_struct lwp;
struct bndreg bndreg[4]; struct bndreg bndreg[4];
struct bndcsr bndcsr; struct bndcsr bndcsr;
/* new processor state extensions will go here */ /* New processor state extensions will go here. */
} __attribute__ ((packed, aligned (64))); } __attribute__ ((packed, aligned (64)));
union thread_xstate { union thread_xstate {
@ -116,9 +125,9 @@ union thread_xstate {
}; };
struct fpu { struct fpu {
unsigned int last_cpu; unsigned int last_cpu;
unsigned int has_fpu; unsigned int has_fpu;
union thread_xstate *state; union thread_xstate *state;
/* /*
* This counter contains the number of consecutive context switches * This counter contains the number of consecutive context switches
* during which the FPU stays used. If this is over a threshold, the * during which the FPU stays used. If this is over a threshold, the
@ -127,6 +136,7 @@ struct fpu {
* wraps and the context switch behavior turns lazy again; this is to * wraps and the context switch behavior turns lazy again; this is to
* deal with bursty apps that only use the FPU for a short time: * deal with bursty apps that only use the FPU for a short time:
*/ */
unsigned char counter; unsigned char counter;
}; };
#endif /* _ASM_X86_FPU_H */