1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/alpha/lib/fpreg.c
4 *
5 * (C) Copyright 1998 Linus Torvalds
6 */
7
8 #include <linux/compiler.h>
9 #include <linux/export.h>
10 #include <linux/preempt.h>
11 #include <asm/fpu.h>
12 #include <asm/thread_info.h>
13 #include <asm/fpu.h>
14
15 #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67)
16 #define STT(reg,val) asm volatile ("ftoit $f"#reg",%0" : "=r"(val));
17 #else
18 #define STT(reg,val) asm volatile ("stt $f"#reg",%0" : "=m"(val));
19 #endif
20
21 unsigned long
22 alpha_read_fp_reg (unsigned long reg)
23 {
24 unsigned long val;
25
26 if (unlikely(reg >= 32))
27 return 0;
28 preempt_disable();
29 if (current_thread_info()->status & TS_SAVED_FP)
30 val = current_thread_info()->fp[reg];
31 else switch (reg) {
32 case 0: STT( 0, val); break;
33 case 1: STT( 1, val); break;
34 case 2: STT( 2, val); break;
35 case 3: STT( 3, val); break;
36 case 4: STT( 4, val); break;
37 case 5: STT( 5, val); break;
38 case 6: STT( 6, val); break;
39 case 7: STT( 7, val); break;
40 case 8: STT( 8, val); break;
41 case 9: STT( 9, val); break;
42 case 10: STT(10, val); break;
43 case 11: STT(11, val); break;
44 case 12: STT(12, val); break;
45 case 13: STT(13, val); break;
46 case 14: STT(14, val); break;
47 case 15: STT(15, val); break;
48 case 16: STT(16, val); break;
49 case 17: STT(17, val); break;
50 case 18: STT(18, val); break;
51 case 19: STT(19, val); break;
52 case 20: STT(20, val); break;
53 case 21: STT(21, val); break;
54 case 22: STT(22, val); break;
55 case 23: STT(23, val); break;
56 case 24: STT(24, val); break;
57 case 25: STT(25, val); break;
58 case 26: STT(26, val); break;
59 case 27: STT(27, val); break;
60 case 28: STT(28, val); break;
61 case 29: STT(29, val); break;
62 case 30: STT(30, val); break;
63 case 31: STT(31, val); break;
64 }
65 preempt_enable();
66 return val;
67 }
68 EXPORT_SYMBOL(alpha_read_fp_reg);
69
70 #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67)
71 #define LDT(reg,val) asm volatile ("itoft %0,$f"#reg : : "r"(val));
72 #else
73 #define LDT(reg,val) asm volatile ("ldt $f"#reg",%0" : : "m"(val));
74 #endif
75
76 void
77 alpha_write_fp_reg (unsigned long reg, unsigned long val)
78 {
79 if (unlikely(reg >= 32))
80 return;
81
82 preempt_disable();
83 if (current_thread_info()->status & TS_SAVED_FP) {
84 current_thread_info()->status |= TS_RESTORE_FP;
85 current_thread_info()->fp[reg] = val;
86 } else switch (reg) {
87 case 0: LDT( 0, val); break;
88 case 1: LDT( 1, val); break;
89 case 2: LDT( 2, val); break;
90 case 3: LDT( 3, val); break;
91 case 4: LDT( 4, val); break;
92 case 5: LDT( 5, val); break;
93 case 6: LDT( 6, val); break;
94 case 7: LDT( 7, val); break;
95 case 8: LDT( 8, val); break;
96 case 9: LDT( 9, val); break;
97 case 10: LDT(10, val); break;
98 case 11: LDT(11, val); break;
99 case 12: LDT(12, val); break;
100 case 13: LDT(13, val); break;
101 case 14: LDT(14, val); break;
102 case 15: LDT(15, val); break;
103 case 16: LDT(16, val); break;
104 case 17: LDT(17, val); break;
105 case 18: LDT(18, val); break;
106 case 19: LDT(19, val); break;
107 case 20: LDT(20, val); break;
108 case 21: LDT(21, val); break;
109 case 22: LDT(22, val); break;
110 case 23: LDT(23, val); break;
111 case 24: LDT(24, val); break;
112 case 25: LDT(25, val); break;
113 case 26: LDT(26, val); break;
114 case 27: LDT(27, val); break;
115 case 28: LDT(28, val); break;
116 case 29: LDT(29, val); break;
117 case 30: LDT(30, val); break;
118 case 31: LDT(31, val); break;
119 }
120 preempt_enable();
121 }
122 EXPORT_SYMBOL(alpha_write_fp_reg);
123
124 #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67)
125 #define STS(reg,val) asm volatile ("ftois $f"#reg",%0" : "=r"(val));
126 #else
127 #define STS(reg,val) asm volatile ("sts $f"#reg",%0" : "=m"(val));
128 #endif
129
130 unsigned long
131 alpha_read_fp_reg_s (unsigned long reg)
132 {
133 unsigned long val;
134
135 if (unlikely(reg >= 32))
136 return 0;
137
138 preempt_disable();
139 if (current_thread_info()->status & TS_SAVED_FP) {
140 LDT(0, current_thread_info()->fp[reg]);
141 STS(0, val);
142 } else switch (reg) {
143 case 0: STS( 0, val); break;
144 case 1: STS( 1, val); break;
145 case 2: STS( 2, val); break;
146 case 3: STS( 3, val); break;
147 case 4: STS( 4, val); break;
148 case 5: STS( 5, val); break;
149 case 6: STS( 6, val); break;
150 case 7: STS( 7, val); break;
151 case 8: STS( 8, val); break;
152 case 9: STS( 9, val); break;
153 case 10: STS(10, val); break;
154 case 11: STS(11, val); break;
155 case 12: STS(12, val); break;
156 case 13: STS(13, val); break;
157 case 14: STS(14, val); break;
158 case 15: STS(15, val); break;
159 case 16: STS(16, val); break;
160 case 17: STS(17, val); break;
161 case 18: STS(18, val); break;
162 case 19: STS(19, val); break;
163 case 20: STS(20, val); break;
164 case 21: STS(21, val); break;
165 case 22: STS(22, val); break;
166 case 23: STS(23, val); break;
167 case 24: STS(24, val); break;
168 case 25: STS(25, val); break;
169 case 26: STS(26, val); break;
170 case 27: STS(27, val); break;
171 case 28: STS(28, val); break;
172 case 29: STS(29, val); break;
173 case 30: STS(30, val); break;
174 case 31: STS(31, val); break;
175 }
176 preempt_enable();
177 return val;
178 }
179 EXPORT_SYMBOL(alpha_read_fp_reg_s);
180
181 #if defined(CONFIG_ALPHA_EV6) || defined(CONFIG_ALPHA_EV67)
182 #define LDS(reg,val) asm volatile ("itofs %0,$f"#reg : : "r"(val));
183 #else
184 #define LDS(reg,val) asm volatile ("lds $f"#reg",%0" : : "m"(val));
185 #endif
186
187 void
188 alpha_write_fp_reg_s (unsigned long reg, unsigned long val)
189 {
190 if (unlikely(reg >= 32))
191 return;
192
193 preempt_disable();
194 if (current_thread_info()->status & TS_SAVED_FP) {
195 current_thread_info()->status |= TS_RESTORE_FP;
196 LDS(0, val);
197 STT(0, current_thread_info()->fp[reg]);
198 } else switch (reg) {
199 case 0: LDS( 0, val); break;
200 case 1: LDS( 1, val); break;
201 case 2: LDS( 2, val); break;
202 case 3: LDS( 3, val); break;
203 case 4: LDS( 4, val); break;
204 case 5: LDS( 5, val); break;
205 case 6: LDS( 6, val); break;
206 case 7: LDS( 7, val); break;
207 case 8: LDS( 8, val); break;
208 case 9: LDS( 9, val); break;
209 case 10: LDS(10, val); break;
210 case 11: LDS(11, val); break;
211 case 12: LDS(12, val); break;
212 case 13: LDS(13, val); break;
213 case 14: LDS(14, val); break;
214 case 15: LDS(15, val); break;
215 case 16: LDS(16, val); break;
216 case 17: LDS(17, val); break;
217 case 18: LDS(18, val); break;
218 case 19: LDS(19, val); break;
219 case 20: LDS(20, val); break;
220 case 21: LDS(21, val); break;
221 case 22: LDS(22, val); break;
222 case 23: LDS(23, val); break;
223 case 24: LDS(24, val); break;
224 case 25: LDS(25, val); break;
225 case 26: LDS(26, val); break;
226 case 27: LDS(27, val); break;
227 case 28: LDS(28, val); break;
228 case 29: LDS(29, val); break;
229 case 30: LDS(30, val); break;
230 case 31: LDS(31, val); break;
231 }
232 preempt_enable();
233 }
234 EXPORT_SYMBOL(alpha_write_fp_reg_s);
235
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