1 /* -*- linux-c -*- ---------------------------
2 *
3 * Copyright 2002-2004 H. Peter Anvin - All
4 *
5 * This program is free software; you can re
6 * it under the terms of the GNU General Pub
7 * the Free Software Foundation, Inc., 53 Te
8 * Boston MA 02111-1307, USA; either version
9 * (at your option) any later version; incor
10 *
11 * -------------------------------------------
12
13 /*
14 * raid6altivec$#.c
15 *
16 * $#-way unrolled portable integer math RAID-
17 *
18 * This file is postprocessed using unroll.awk
19 *
20 * <benh> hpa: in process,
21 * you can just "steal" the vec unit with enab
22 * bracked this with preempt_disable/enable or
23 */
24
25 #include <linux/raid/pq.h>
26
27 #ifdef CONFIG_ALTIVEC
28
29 #include <altivec.h>
30 #ifdef __KERNEL__
31 # include <asm/cputable.h>
32 # include <asm/switch_to.h>
33 #endif /* __KERNEL__ */
34
35 /*
36 * This is the C data type to use. We use a v
37 * signed char so vec_cmpgt() will generate th
38 * instruction.
39 */
40
41 typedef vector signed char unative_t;
42
43 #define NBYTES(x) ((vector signed char) {x,x,x
44 #define NSIZE sizeof(unative_t)
45
46 /*
47 * The SHLBYTE() operation shifts each byte le
48 * rolling over into the next byte
49 */
50 static inline __attribute_const__ unative_t SH
51 {
52 return vec_add(v,v);
53 }
54
55 /*
56 * The MASK() operation returns 0xFF in any by
57 * bit is 1, 0x00 for any byte for which the h
58 */
59 static inline __attribute_const__ unative_t MA
60 {
61 unative_t zv = NBYTES(0);
62
63 /* vec_cmpgt returns a vector bool cha
64 return (unative_t)vec_cmpgt(zv, v);
65 }
66
67
68 /* This is noinline to make damned sure that g
69 Altivec code around the enable/disable code
70 static void noinline
71 raid6_altivec$#_gen_syndrome_real(int disks, s
72 {
73 u8 **dptr = (u8 **)ptrs;
74 u8 *p, *q;
75 int d, z, z0;
76
77 unative_t wd$$, wq$$, wp$$, w1$$, w2$$
78 unative_t x1d = NBYTES(0x1d);
79
80 z0 = disks - 3; /* Highest dat
81 p = dptr[z0+1]; /* XOR parity
82 q = dptr[z0+2]; /* RS syndrome
83
84 for ( d = 0 ; d < bytes ; d += NSIZE*$
85 wq$$ = wp$$ = *(unative_t *)&d
86 for ( z = z0-1 ; z >= 0 ; z--
87 wd$$ = *(unative_t *)&
88 wp$$ = vec_xor(wp$$, w
89 w2$$ = MASK(wq$$);
90 w1$$ = SHLBYTE(wq$$);
91 w2$$ = vec_and(w2$$, x
92 w1$$ = vec_xor(w1$$, w
93 wq$$ = vec_xor(w1$$, w
94 }
95 *(unative_t *)&p[d+NSIZE*$$] =
96 *(unative_t *)&q[d+NSIZE*$$] =
97 }
98 }
99
100 static void raid6_altivec$#_gen_syndrome(int d
101 {
102 preempt_disable();
103 enable_kernel_altivec();
104
105 raid6_altivec$#_gen_syndrome_real(disk
106
107 disable_kernel_altivec();
108 preempt_enable();
109 }
110
111 int raid6_have_altivec(void);
112 #if $# == 1
113 int raid6_have_altivec(void)
114 {
115 /* This assumes either all CPUs have A
116 # ifdef __KERNEL__
117 return cpu_has_feature(CPU_FTR_ALTIVEC
118 # else
119 return 1;
120 # endif
121 }
122 #endif
123
124 const struct raid6_calls raid6_altivec$# = {
125 raid6_altivec$#_gen_syndrome,
126 NULL, /* XOR not yet
127 raid6_have_altivec,
128 "altivecx$#",
129 0
130 };
131
132 #endif /* CONFIG_ALTIVEC */
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