1 /* ----------------------------------------------------------------------- *
3 * Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
8 * Bostom MA 02111-1307, USA; either version 2 of the License, or
9 * (at your option) any later version; incorporated herein by reference.
11 * ----------------------------------------------------------------------- */
16 * Definitions common to x86 and x86-64 RAID-6 code only
19 #ifndef LINUX_RAID_RAID6X86_H
20 #define LINUX_RAID_RAID6X86_H
22 #if defined(__i386__) || defined(__x86_64__)
27 unsigned int fsave[27];
29 } raid6_mmx_save_t __attribute__((aligned(16)));
31 /* N.B.: For SSE we only save %xmm0-%xmm7 even for x86-64, since
32 the code doesn't know about the additional x86-64 registers */
34 unsigned int sarea[8*4+2];
36 } raid6_sse_save_t __attribute__((aligned(16)));
38 /* This is for x86-64-specific code which uses all 16 XMM registers */
40 unsigned int sarea[16*4+2];
42 } raid6_sse16_save_t __attribute__((aligned(16)));
44 /* On x86-64 the stack *SHOULD* be 16-byte aligned, but currently this
45 is buggy in the kernel and it's only 8-byte aligned in places, so
46 we need to do this anyway. Sigh. */
47 #define SAREA(x) ((unsigned int *)((((unsigned long)&(x)->sarea)+15) & ~15))
52 unsigned int fsave[27];
56 /* On i386, the stack is only 8-byte aligned, but SSE requires 16-byte
57 alignment. The +3 is so we have the slack space to manually align
58 a properly-sized area correctly. */
60 unsigned int sarea[8*4+3];
64 /* Find the 16-byte aligned save area */
65 #define SAREA(x) ((unsigned int *)((((unsigned long)&(x)->sarea)+15) & ~15))
69 #ifdef __KERNEL__ /* Real code */
71 /* Note: %cr0 is 32 bits on i386 and 64 bits on x86-64 */
73 static inline unsigned long raid6_get_fpu(void)
78 asm volatile("mov %%cr0,%0 ; clts" : "=r" (cr0));
82 static inline void raid6_put_fpu(unsigned long cr0)
84 asm volatile("mov %0,%%cr0" : : "r" (cr0));
88 #else /* Dummy code for user space testing */
90 static inline unsigned long raid6_get_fpu(void)
95 static inline void raid6_put_fpu(unsigned long cr0)
102 static inline void raid6_before_mmx(raid6_mmx_save_t *s)
104 s->cr0 = raid6_get_fpu();
105 asm volatile("fsave %0 ; fwait" : "=m" (s->fsave[0]));
108 static inline void raid6_after_mmx(raid6_mmx_save_t *s)
110 asm volatile("frstor %0" : : "m" (s->fsave[0]));
111 raid6_put_fpu(s->cr0);
114 static inline void raid6_before_sse(raid6_sse_save_t *s)
116 unsigned int *rsa = SAREA(s);
118 s->cr0 = raid6_get_fpu();
120 asm volatile("movaps %%xmm0,%0" : "=m" (rsa[0]));
121 asm volatile("movaps %%xmm1,%0" : "=m" (rsa[4]));
122 asm volatile("movaps %%xmm2,%0" : "=m" (rsa[8]));
123 asm volatile("movaps %%xmm3,%0" : "=m" (rsa[12]));
124 asm volatile("movaps %%xmm4,%0" : "=m" (rsa[16]));
125 asm volatile("movaps %%xmm5,%0" : "=m" (rsa[20]));
126 asm volatile("movaps %%xmm6,%0" : "=m" (rsa[24]));
127 asm volatile("movaps %%xmm7,%0" : "=m" (rsa[28]));
130 static inline void raid6_after_sse(raid6_sse_save_t *s)
132 unsigned int *rsa = SAREA(s);
134 asm volatile("movaps %0,%%xmm0" : : "m" (rsa[0]));
135 asm volatile("movaps %0,%%xmm1" : : "m" (rsa[4]));
136 asm volatile("movaps %0,%%xmm2" : : "m" (rsa[8]));
137 asm volatile("movaps %0,%%xmm3" : : "m" (rsa[12]));
138 asm volatile("movaps %0,%%xmm4" : : "m" (rsa[16]));
139 asm volatile("movaps %0,%%xmm5" : : "m" (rsa[20]));
140 asm volatile("movaps %0,%%xmm6" : : "m" (rsa[24]));
141 asm volatile("movaps %0,%%xmm7" : : "m" (rsa[28]));
143 raid6_put_fpu(s->cr0);
146 static inline void raid6_before_sse2(raid6_sse_save_t *s)
148 unsigned int *rsa = SAREA(s);
150 s->cr0 = raid6_get_fpu();
152 asm volatile("movdqa %%xmm0,%0" : "=m" (rsa[0]));
153 asm volatile("movdqa %%xmm1,%0" : "=m" (rsa[4]));
154 asm volatile("movdqa %%xmm2,%0" : "=m" (rsa[8]));
155 asm volatile("movdqa %%xmm3,%0" : "=m" (rsa[12]));
156 asm volatile("movdqa %%xmm4,%0" : "=m" (rsa[16]));
157 asm volatile("movdqa %%xmm5,%0" : "=m" (rsa[20]));
158 asm volatile("movdqa %%xmm6,%0" : "=m" (rsa[24]));
159 asm volatile("movdqa %%xmm7,%0" : "=m" (rsa[28]));
162 static inline void raid6_after_sse2(raid6_sse_save_t *s)
164 unsigned int *rsa = SAREA(s);
166 asm volatile("movdqa %0,%%xmm0" : : "m" (rsa[0]));
167 asm volatile("movdqa %0,%%xmm1" : : "m" (rsa[4]));
168 asm volatile("movdqa %0,%%xmm2" : : "m" (rsa[8]));
169 asm volatile("movdqa %0,%%xmm3" : : "m" (rsa[12]));
170 asm volatile("movdqa %0,%%xmm4" : : "m" (rsa[16]));
171 asm volatile("movdqa %0,%%xmm5" : : "m" (rsa[20]));
172 asm volatile("movdqa %0,%%xmm6" : : "m" (rsa[24]));
173 asm volatile("movdqa %0,%%xmm7" : : "m" (rsa[28]));
175 raid6_put_fpu(s->cr0);
180 static inline void raid6_before_sse16(raid6_sse16_save_t *s)
182 unsigned int *rsa = SAREA(s);
184 s->cr0 = raid6_get_fpu();
186 asm volatile("movdqa %%xmm0,%0" : "=m" (rsa[0]));
187 asm volatile("movdqa %%xmm1,%0" : "=m" (rsa[4]));
188 asm volatile("movdqa %%xmm2,%0" : "=m" (rsa[8]));
189 asm volatile("movdqa %%xmm3,%0" : "=m" (rsa[12]));
190 asm volatile("movdqa %%xmm4,%0" : "=m" (rsa[16]));
191 asm volatile("movdqa %%xmm5,%0" : "=m" (rsa[20]));
192 asm volatile("movdqa %%xmm6,%0" : "=m" (rsa[24]));
193 asm volatile("movdqa %%xmm7,%0" : "=m" (rsa[28]));
194 asm volatile("movdqa %%xmm8,%0" : "=m" (rsa[32]));
195 asm volatile("movdqa %%xmm9,%0" : "=m" (rsa[36]));
196 asm volatile("movdqa %%xmm10,%0" : "=m" (rsa[40]));
197 asm volatile("movdqa %%xmm11,%0" : "=m" (rsa[44]));
198 asm volatile("movdqa %%xmm12,%0" : "=m" (rsa[48]));
199 asm volatile("movdqa %%xmm13,%0" : "=m" (rsa[52]));
200 asm volatile("movdqa %%xmm14,%0" : "=m" (rsa[56]));
201 asm volatile("movdqa %%xmm15,%0" : "=m" (rsa[60]));
204 static inline void raid6_after_sse16(raid6_sse16_save_t *s)
206 unsigned int *rsa = SAREA(s);
208 asm volatile("movdqa %0,%%xmm0" : : "m" (rsa[0]));
209 asm volatile("movdqa %0,%%xmm1" : : "m" (rsa[4]));
210 asm volatile("movdqa %0,%%xmm2" : : "m" (rsa[8]));
211 asm volatile("movdqa %0,%%xmm3" : : "m" (rsa[12]));
212 asm volatile("movdqa %0,%%xmm4" : : "m" (rsa[16]));
213 asm volatile("movdqa %0,%%xmm5" : : "m" (rsa[20]));
214 asm volatile("movdqa %0,%%xmm6" : : "m" (rsa[24]));
215 asm volatile("movdqa %0,%%xmm7" : : "m" (rsa[28]));
216 asm volatile("movdqa %0,%%xmm8" : : "m" (rsa[32]));
217 asm volatile("movdqa %0,%%xmm9" : : "m" (rsa[36]));
218 asm volatile("movdqa %0,%%xmm10" : : "m" (rsa[40]));
219 asm volatile("movdqa %0,%%xmm11" : : "m" (rsa[44]));
220 asm volatile("movdqa %0,%%xmm12" : : "m" (rsa[48]));
221 asm volatile("movdqa %0,%%xmm13" : : "m" (rsa[52]));
222 asm volatile("movdqa %0,%%xmm14" : : "m" (rsa[56]));
223 asm volatile("movdqa %0,%%xmm15" : : "m" (rsa[60]));
225 raid6_put_fpu(s->cr0);
228 #endif /* __x86_64__ */
230 /* User space test hack */
232 static inline int cpuid_features(void)
237 asm volatile("cpuid" :
238 "+a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx));
242 #endif /* ndef __KERNEL__ */