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kernel-ark/drivers/md/raid6x86.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

246 lines
7.2 KiB
C
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/* ----------------------------------------------------------------------- *
*
* Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Bostom MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* raid6x86.h
*
* Definitions common to x86 and x86-64 RAID-6 code only
*/
#ifndef LINUX_RAID_RAID6X86_H
#define LINUX_RAID_RAID6X86_H
#if defined(__i386__) || defined(__x86_64__)
#ifdef __x86_64__
typedef struct {
unsigned int fsave[27];
unsigned long cr0;
} raid6_mmx_save_t __attribute__((aligned(16)));
/* N.B.: For SSE we only save %xmm0-%xmm7 even for x86-64, since
the code doesn't know about the additional x86-64 registers */
typedef struct {
unsigned int sarea[8*4+2];
unsigned long cr0;
} raid6_sse_save_t __attribute__((aligned(16)));
/* This is for x86-64-specific code which uses all 16 XMM registers */
typedef struct {
unsigned int sarea[16*4+2];
unsigned long cr0;
} raid6_sse16_save_t __attribute__((aligned(16)));
/* On x86-64 the stack *SHOULD* be 16-byte aligned, but currently this
is buggy in the kernel and it's only 8-byte aligned in places, so
we need to do this anyway. Sigh. */
#define SAREA(x) ((unsigned int *)((((unsigned long)&(x)->sarea)+15) & ~15))
#else /* __i386__ */
typedef struct {
unsigned int fsave[27];
unsigned long cr0;
} raid6_mmx_save_t;
/* On i386, the stack is only 8-byte aligned, but SSE requires 16-byte
alignment. The +3 is so we have the slack space to manually align
a properly-sized area correctly. */
typedef struct {
unsigned int sarea[8*4+3];
unsigned long cr0;
} raid6_sse_save_t;
/* Find the 16-byte aligned save area */
#define SAREA(x) ((unsigned int *)((((unsigned long)&(x)->sarea)+15) & ~15))
#endif
#ifdef __KERNEL__ /* Real code */
/* Note: %cr0 is 32 bits on i386 and 64 bits on x86-64 */
static inline unsigned long raid6_get_fpu(void)
{
unsigned long cr0;
preempt_disable();
asm volatile("mov %%cr0,%0 ; clts" : "=r" (cr0));
return cr0;
}
static inline void raid6_put_fpu(unsigned long cr0)
{
asm volatile("mov %0,%%cr0" : : "r" (cr0));
preempt_enable();
}
#else /* Dummy code for user space testing */
static inline unsigned long raid6_get_fpu(void)
{
return 0xf00ba6;
}
static inline void raid6_put_fpu(unsigned long cr0)
{
(void)cr0;
}
#endif
static inline void raid6_before_mmx(raid6_mmx_save_t *s)
{
s->cr0 = raid6_get_fpu();
asm volatile("fsave %0 ; fwait" : "=m" (s->fsave[0]));
}
static inline void raid6_after_mmx(raid6_mmx_save_t *s)
{
asm volatile("frstor %0" : : "m" (s->fsave[0]));
raid6_put_fpu(s->cr0);
}
static inline void raid6_before_sse(raid6_sse_save_t *s)
{
unsigned int *rsa = SAREA(s);
s->cr0 = raid6_get_fpu();
asm volatile("movaps %%xmm0,%0" : "=m" (rsa[0]));
asm volatile("movaps %%xmm1,%0" : "=m" (rsa[4]));
asm volatile("movaps %%xmm2,%0" : "=m" (rsa[8]));
asm volatile("movaps %%xmm3,%0" : "=m" (rsa[12]));
asm volatile("movaps %%xmm4,%0" : "=m" (rsa[16]));
asm volatile("movaps %%xmm5,%0" : "=m" (rsa[20]));
asm volatile("movaps %%xmm6,%0" : "=m" (rsa[24]));
asm volatile("movaps %%xmm7,%0" : "=m" (rsa[28]));
}
static inline void raid6_after_sse(raid6_sse_save_t *s)
{
unsigned int *rsa = SAREA(s);
asm volatile("movaps %0,%%xmm0" : : "m" (rsa[0]));
asm volatile("movaps %0,%%xmm1" : : "m" (rsa[4]));
asm volatile("movaps %0,%%xmm2" : : "m" (rsa[8]));
asm volatile("movaps %0,%%xmm3" : : "m" (rsa[12]));
asm volatile("movaps %0,%%xmm4" : : "m" (rsa[16]));
asm volatile("movaps %0,%%xmm5" : : "m" (rsa[20]));
asm volatile("movaps %0,%%xmm6" : : "m" (rsa[24]));
asm volatile("movaps %0,%%xmm7" : : "m" (rsa[28]));
raid6_put_fpu(s->cr0);
}
static inline void raid6_before_sse2(raid6_sse_save_t *s)
{
unsigned int *rsa = SAREA(s);
s->cr0 = raid6_get_fpu();
asm volatile("movdqa %%xmm0,%0" : "=m" (rsa[0]));
asm volatile("movdqa %%xmm1,%0" : "=m" (rsa[4]));
asm volatile("movdqa %%xmm2,%0" : "=m" (rsa[8]));
asm volatile("movdqa %%xmm3,%0" : "=m" (rsa[12]));
asm volatile("movdqa %%xmm4,%0" : "=m" (rsa[16]));
asm volatile("movdqa %%xmm5,%0" : "=m" (rsa[20]));
asm volatile("movdqa %%xmm6,%0" : "=m" (rsa[24]));
asm volatile("movdqa %%xmm7,%0" : "=m" (rsa[28]));
}
static inline void raid6_after_sse2(raid6_sse_save_t *s)
{
unsigned int *rsa = SAREA(s);
asm volatile("movdqa %0,%%xmm0" : : "m" (rsa[0]));
asm volatile("movdqa %0,%%xmm1" : : "m" (rsa[4]));
asm volatile("movdqa %0,%%xmm2" : : "m" (rsa[8]));
asm volatile("movdqa %0,%%xmm3" : : "m" (rsa[12]));
asm volatile("movdqa %0,%%xmm4" : : "m" (rsa[16]));
asm volatile("movdqa %0,%%xmm5" : : "m" (rsa[20]));
asm volatile("movdqa %0,%%xmm6" : : "m" (rsa[24]));
asm volatile("movdqa %0,%%xmm7" : : "m" (rsa[28]));
raid6_put_fpu(s->cr0);
}
#ifdef __x86_64__
static inline void raid6_before_sse16(raid6_sse16_save_t *s)
{
unsigned int *rsa = SAREA(s);
s->cr0 = raid6_get_fpu();
asm volatile("movdqa %%xmm0,%0" : "=m" (rsa[0]));
asm volatile("movdqa %%xmm1,%0" : "=m" (rsa[4]));
asm volatile("movdqa %%xmm2,%0" : "=m" (rsa[8]));
asm volatile("movdqa %%xmm3,%0" : "=m" (rsa[12]));
asm volatile("movdqa %%xmm4,%0" : "=m" (rsa[16]));
asm volatile("movdqa %%xmm5,%0" : "=m" (rsa[20]));
asm volatile("movdqa %%xmm6,%0" : "=m" (rsa[24]));
asm volatile("movdqa %%xmm7,%0" : "=m" (rsa[28]));
asm volatile("movdqa %%xmm8,%0" : "=m" (rsa[32]));
asm volatile("movdqa %%xmm9,%0" : "=m" (rsa[36]));
asm volatile("movdqa %%xmm10,%0" : "=m" (rsa[40]));
asm volatile("movdqa %%xmm11,%0" : "=m" (rsa[44]));
asm volatile("movdqa %%xmm12,%0" : "=m" (rsa[48]));
asm volatile("movdqa %%xmm13,%0" : "=m" (rsa[52]));
asm volatile("movdqa %%xmm14,%0" : "=m" (rsa[56]));
asm volatile("movdqa %%xmm15,%0" : "=m" (rsa[60]));
}
static inline void raid6_after_sse16(raid6_sse16_save_t *s)
{
unsigned int *rsa = SAREA(s);
asm volatile("movdqa %0,%%xmm0" : : "m" (rsa[0]));
asm volatile("movdqa %0,%%xmm1" : : "m" (rsa[4]));
asm volatile("movdqa %0,%%xmm2" : : "m" (rsa[8]));
asm volatile("movdqa %0,%%xmm3" : : "m" (rsa[12]));
asm volatile("movdqa %0,%%xmm4" : : "m" (rsa[16]));
asm volatile("movdqa %0,%%xmm5" : : "m" (rsa[20]));
asm volatile("movdqa %0,%%xmm6" : : "m" (rsa[24]));
asm volatile("movdqa %0,%%xmm7" : : "m" (rsa[28]));
asm volatile("movdqa %0,%%xmm8" : : "m" (rsa[32]));
asm volatile("movdqa %0,%%xmm9" : : "m" (rsa[36]));
asm volatile("movdqa %0,%%xmm10" : : "m" (rsa[40]));
asm volatile("movdqa %0,%%xmm11" : : "m" (rsa[44]));
asm volatile("movdqa %0,%%xmm12" : : "m" (rsa[48]));
asm volatile("movdqa %0,%%xmm13" : : "m" (rsa[52]));
asm volatile("movdqa %0,%%xmm14" : : "m" (rsa[56]));
asm volatile("movdqa %0,%%xmm15" : : "m" (rsa[60]));
raid6_put_fpu(s->cr0);
}
#endif /* __x86_64__ */
/* User space test hack */
#ifndef __KERNEL__
static inline int cpuid_features(void)
{
u32 eax = 1;
u32 ebx, ecx, edx;
asm volatile("cpuid" :
"+a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx));
return edx;
}
#endif /* ndef __KERNEL__ */
#endif
#endif
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