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