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14cf11af PM |
1 | #include <linux/config.h> |
2 | #include <asm/ppc_asm.h> | |
3 | #include <asm/processor.h> | |
4 | ||
5 | /* | |
6 | * The routines below are in assembler so we can closely control the | |
7 | * usage of floating-point registers. These routines must be called | |
8 | * with preempt disabled. | |
9 | */ | |
10 | #ifdef CONFIG_PPC32 | |
11 | .data | |
12 | fpzero: | |
13 | .long 0 | |
14 | fpone: | |
15 | .long 0x3f800000 /* 1.0 in single-precision FP */ | |
16 | fphalf: | |
17 | .long 0x3f000000 /* 0.5 in single-precision FP */ | |
18 | ||
19 | #define LDCONST(fr, name) \ | |
20 | lis r11,name@ha; \ | |
21 | lfs fr,name@l(r11) | |
22 | #else | |
23 | ||
24 | .section ".toc","aw" | |
25 | fpzero: | |
26 | .tc FD_0_0[TC],0 | |
27 | fpone: | |
28 | .tc FD_3ff00000_0[TC],0x3ff0000000000000 /* 1.0 */ | |
29 | fphalf: | |
30 | .tc FD_3fe00000_0[TC],0x3fe0000000000000 /* 0.5 */ | |
31 | ||
32 | #define LDCONST(fr, name) \ | |
33 | lfd fr,name@toc(r2) | |
34 | #endif | |
35 | ||
36 | .text | |
37 | /* | |
38 | * Internal routine to enable floating point and set FPSCR to 0. | |
39 | * Don't call it from C; it doesn't use the normal calling convention. | |
40 | */ | |
41 | fpenable: | |
42 | #ifdef CONFIG_PPC32 | |
43 | stwu r1,-64(r1) | |
44 | #else | |
45 | stdu r1,-64(r1) | |
46 | #endif | |
47 | mfmsr r10 | |
48 | ori r11,r10,MSR_FP | |
49 | mtmsr r11 | |
50 | isync | |
51 | stfd fr0,24(r1) | |
52 | stfd fr1,16(r1) | |
53 | stfd fr31,8(r1) | |
54 | LDCONST(fr1, fpzero) | |
55 | mffs fr31 | |
56 | mtfsf 0xff,fr1 | |
57 | blr | |
58 | ||
59 | fpdisable: | |
60 | mtlr r12 | |
61 | mtfsf 0xff,fr31 | |
62 | lfd fr31,8(r1) | |
63 | lfd fr1,16(r1) | |
64 | lfd fr0,24(r1) | |
65 | mtmsr r10 | |
66 | isync | |
67 | addi r1,r1,64 | |
68 | blr | |
69 | ||
70 | /* | |
71 | * Vector add, floating point. | |
72 | */ | |
73 | _GLOBAL(vaddfp) | |
74 | mflr r12 | |
75 | bl fpenable | |
76 | li r0,4 | |
77 | mtctr r0 | |
78 | li r6,0 | |
79 | 1: lfsx fr0,r4,r6 | |
80 | lfsx fr1,r5,r6 | |
81 | fadds fr0,fr0,fr1 | |
82 | stfsx fr0,r3,r6 | |
83 | addi r6,r6,4 | |
84 | bdnz 1b | |
85 | b fpdisable | |
86 | ||
87 | /* | |
88 | * Vector subtract, floating point. | |
89 | */ | |
90 | _GLOBAL(vsubfp) | |
91 | mflr r12 | |
92 | bl fpenable | |
93 | li r0,4 | |
94 | mtctr r0 | |
95 | li r6,0 | |
96 | 1: lfsx fr0,r4,r6 | |
97 | lfsx fr1,r5,r6 | |
98 | fsubs fr0,fr0,fr1 | |
99 | stfsx fr0,r3,r6 | |
100 | addi r6,r6,4 | |
101 | bdnz 1b | |
102 | b fpdisable | |
103 | ||
104 | /* | |
105 | * Vector multiply and add, floating point. | |
106 | */ | |
107 | _GLOBAL(vmaddfp) | |
108 | mflr r12 | |
109 | bl fpenable | |
110 | stfd fr2,32(r1) | |
111 | li r0,4 | |
112 | mtctr r0 | |
113 | li r7,0 | |
114 | 1: lfsx fr0,r4,r7 | |
115 | lfsx fr1,r5,r7 | |
116 | lfsx fr2,r6,r7 | |
117 | fmadds fr0,fr0,fr2,fr1 | |
118 | stfsx fr0,r3,r7 | |
119 | addi r7,r7,4 | |
120 | bdnz 1b | |
121 | lfd fr2,32(r1) | |
122 | b fpdisable | |
123 | ||
124 | /* | |
125 | * Vector negative multiply and subtract, floating point. | |
126 | */ | |
127 | _GLOBAL(vnmsubfp) | |
128 | mflr r12 | |
129 | bl fpenable | |
130 | stfd fr2,32(r1) | |
131 | li r0,4 | |
132 | mtctr r0 | |
133 | li r7,0 | |
134 | 1: lfsx fr0,r4,r7 | |
135 | lfsx fr1,r5,r7 | |
136 | lfsx fr2,r6,r7 | |
137 | fnmsubs fr0,fr0,fr2,fr1 | |
138 | stfsx fr0,r3,r7 | |
139 | addi r7,r7,4 | |
140 | bdnz 1b | |
141 | lfd fr2,32(r1) | |
142 | b fpdisable | |
143 | ||
144 | /* | |
145 | * Vector reciprocal estimate. We just compute 1.0/x. | |
146 | * r3 -> destination, r4 -> source. | |
147 | */ | |
148 | _GLOBAL(vrefp) | |
149 | mflr r12 | |
150 | bl fpenable | |
151 | li r0,4 | |
152 | LDCONST(fr1, fpone) | |
153 | mtctr r0 | |
154 | li r6,0 | |
155 | 1: lfsx fr0,r4,r6 | |
156 | fdivs fr0,fr1,fr0 | |
157 | stfsx fr0,r3,r6 | |
158 | addi r6,r6,4 | |
159 | bdnz 1b | |
160 | b fpdisable | |
161 | ||
162 | /* | |
163 | * Vector reciprocal square-root estimate, floating point. | |
164 | * We use the frsqrte instruction for the initial estimate followed | |
165 | * by 2 iterations of Newton-Raphson to get sufficient accuracy. | |
166 | * r3 -> destination, r4 -> source. | |
167 | */ | |
168 | _GLOBAL(vrsqrtefp) | |
169 | mflr r12 | |
170 | bl fpenable | |
171 | stfd fr2,32(r1) | |
172 | stfd fr3,40(r1) | |
173 | stfd fr4,48(r1) | |
174 | stfd fr5,56(r1) | |
175 | li r0,4 | |
176 | LDCONST(fr4, fpone) | |
177 | LDCONST(fr5, fphalf) | |
178 | mtctr r0 | |
179 | li r6,0 | |
180 | 1: lfsx fr0,r4,r6 | |
181 | frsqrte fr1,fr0 /* r = frsqrte(s) */ | |
182 | fmuls fr3,fr1,fr0 /* r * s */ | |
183 | fmuls fr2,fr1,fr5 /* r * 0.5 */ | |
184 | fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */ | |
185 | fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */ | |
186 | fmuls fr3,fr1,fr0 /* r * s */ | |
187 | fmuls fr2,fr1,fr5 /* r * 0.5 */ | |
188 | fnmsubs fr3,fr1,fr3,fr4 /* 1 - s * r * r */ | |
189 | fmadds fr1,fr2,fr3,fr1 /* r = r + 0.5 * r * (1 - s * r * r) */ | |
190 | stfsx fr1,r3,r6 | |
191 | addi r6,r6,4 | |
192 | bdnz 1b | |
193 | lfd fr5,56(r1) | |
194 | lfd fr4,48(r1) | |
195 | lfd fr3,40(r1) | |
196 | lfd fr2,32(r1) | |
197 | b fpdisable |