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