1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 1999 by Ralf Baechle
7 * Copyright (C) 1996 by Paul M. Antoine
8 * Copyright (C) 1994 - 1999 by Ralf Baechle
9 * Kevin D. Kissell, kevink@mips.org and Carsten Langgaard, carstenl@mips.com
10 * Copyright (C) 2000 MIPS Technologies, Inc.
11 */
12 #ifndef _ASM_SYSTEM_H
13 #define _ASM_SYSTEM_H
14
15 #include <linux/config.h>
16 #include <asm/sgidefs.h>
17
18 #include <linux/kernel.h>
19
20 #include <asm/addrspace.h>
21 #include <asm/ptrace.h>
22
23 __asm__ (
24 ".macro\t__sti\n\t"
25 ".set\tpush\n\t"
26 ".set\treorder\n\t"
27 ".set\tnoat\n\t"
28 "mfc0\t$1,$12\n\t"
29 "ori\t$1,0x1f\n\t"
30 "xori\t$1,0x1e\n\t"
31 "mtc0\t$1,$12\n\t"
32 ".set\tpop\n\t"
33 ".endm");
34
35 static __inline__ void
__sti(void)36 __sti(void)
37 {
38 __asm__ __volatile__(
39 "__sti"
40 : /* no outputs */
41 : /* no inputs */
42 : "memory");
43 }
44
45 /*
46 * For cli() we have to insert nops to make sure that the new value
47 * has actually arrived in the status register before the end of this
48 * macro.
49 * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
50 * no nops at all.
51 */
52 __asm__ (
53 ".macro\t__cli\n\t"
54 ".set\tpush\n\t"
55 ".set\tnoat\n\t"
56 "mfc0\t$1,$12\n\t"
57 "ori\t$1,1\n\t"
58 "xori\t$1,1\n\t"
59 ".set\tnoreorder\n\t"
60 "mtc0\t$1,$12\n\t"
61 "sll\t$0, $0, 1\t\t\t# nop\n\t"
62 "sll\t$0, $0, 1\t\t\t# nop\n\t"
63 "sll\t$0, $0, 1\t\t\t# nop\n\t"
64 ".set\tpop\n\t"
65 ".endm");
66
67 static __inline__ void
__cli(void)68 __cli(void)
69 {
70 __asm__ __volatile__(
71 "__cli"
72 : /* no outputs */
73 : /* no inputs */
74 : "memory");
75 }
76
77 __asm__ (
78 ".macro\t__save_flags flags\n\t"
79 ".set\tpush\n\t"
80 ".set\treorder\n\t"
81 "mfc0\t\\flags, $12\n\t"
82 ".set\tpop\n\t"
83 ".endm");
84
85 #define __save_flags(x) \
86 __asm__ __volatile__( \
87 "__save_flags %0" \
88 : "=r" (x))
89
90 __asm__ (
91 ".macro\t__save_and_cli result\n\t"
92 ".set\tpush\n\t"
93 ".set\treorder\n\t"
94 ".set\tnoat\n\t"
95 "mfc0\t\\result, $12\n\t"
96 "ori\t$1, \\result, 1\n\t"
97 "xori\t$1, 1\n\t"
98 ".set\tnoreorder\n\t"
99 "mtc0\t$1, $12\n\t"
100 "sll\t$0, $0, 1\t\t\t# nop\n\t"
101 "sll\t$0, $0, 1\t\t\t# nop\n\t"
102 "sll\t$0, $0, 1\t\t\t# nop\n\t"
103 ".set\tpop\n\t"
104 ".endm");
105
106 #define __save_and_cli(x) \
107 __asm__ __volatile__( \
108 "__save_and_cli\t%0" \
109 : "=r" (x) \
110 : /* no inputs */ \
111 : "memory")
112
113 __asm__ (
114 ".macro\t__save_and_sti result\n\t"
115 ".set\tpush\n\t"
116 ".set\treorder\n\t"
117 ".set\tnoat\n\t"
118 "mfc0\t\\result, $12\n\t"
119 "ori\t$1, \\result, 1\n\t"
120 ".set\tnoreorder\n\t"
121 "mtc0\t$1, $12\n\t"
122 ".set\tpop\n\t"
123 ".endm");
124
125 #define __save_and_sti(x) \
126 __asm__ __volatile__( \
127 "__save_and_sti\t%0" \
128 : "=r" (x) \
129 : /* no inputs */ \
130 : "memory")
131
132 __asm__(".macro\t__restore_flags flags\n\t"
133 ".set\tnoreorder\n\t"
134 ".set\tnoat\n\t"
135 "mfc0\t$1, $12\n\t"
136 "andi\t\\flags, 1\n\t"
137 "ori\t$1, 1\n\t"
138 "xori\t$1, 1\n\t"
139 "or\t\\flags, $1\n\t"
140 "mtc0\t\\flags, $12\n\t"
141 "sll\t$0, $0, 1\t\t\t# nop\n\t"
142 "sll\t$0, $0, 1\t\t\t# nop\n\t"
143 "sll\t$0, $0, 1\t\t\t# nop\n\t"
144 ".set\tat\n\t"
145 ".set\treorder\n\t"
146 ".endm");
147
148 #define __restore_flags(flags) \
149 do { \
150 unsigned long __tmp1; \
151 \
152 __asm__ __volatile__( \
153 "__restore_flags\t%0" \
154 : "=r" (__tmp1) \
155 : "0" (flags) \
156 : "memory"); \
157 } while(0)
158
159 #ifdef CONFIG_SMP
160
161 extern void __global_sti(void);
162 extern void __global_cli(void);
163 extern unsigned long __global_save_flags(void);
164 extern void __global_restore_flags(unsigned long);
165 # define sti() __global_sti()
166 # define cli() __global_cli()
167 # define save_flags(x) do { x = __global_save_flags(); } while (0)
168 # define restore_flags(x) __global_restore_flags(x)
169 # define save_and_cli(x) do { save_flags(x); cli(); } while(0)
170 # define save_and_sti(x) do { save_flags(x); sti(); } while(0)
171
172 #else /* Single processor */
173
174 # define sti() __sti()
175 # define cli() __cli()
176 # define save_flags(x) __save_flags(x)
177 # define save_and_cli(x) __save_and_cli(x)
178 # define restore_flags(x) __restore_flags(x)
179 # define save_and_sti(x) __save_and_sti(x)
180
181 #endif /* SMP */
182
183 /* For spinlocks etc */
184 #define local_irq_save(x) __save_and_cli(x)
185 #define local_irq_set(x) __save_and_sti(x)
186 #define local_irq_restore(x) __restore_flags(x)
187 #define local_irq_disable() __cli()
188 #define local_irq_enable() __sti()
189
190 #ifdef CONFIG_CPU_HAS_SYNC
191 #define __sync() \
192 __asm__ __volatile__( \
193 ".set push\n\t" \
194 ".set noreorder\n\t" \
195 ".set mips2\n\t" \
196 "sync\n\t" \
197 ".set pop" \
198 : /* no output */ \
199 : /* no input */ \
200 : "memory")
201 #else
202 #define __sync() do { } while(0)
203 #endif
204
205 #define __fast_iob() \
206 __asm__ __volatile__( \
207 ".set push\n\t" \
208 ".set noreorder\n\t" \
209 "lw $0,%0\n\t" \
210 "nop\n\t" \
211 ".set pop" \
212 : /* no output */ \
213 : "m" (*(int *)KSEG1) \
214 : "memory")
215
216 #define fast_wmb() __sync()
217 #define fast_rmb() __sync()
218 #define fast_mb() __sync()
219 #define fast_iob() \
220 do { \
221 __sync(); \
222 __fast_iob(); \
223 } while (0)
224
225 #ifdef CONFIG_CPU_HAS_WB
226
227 #include <asm/wbflush.h>
228
229 #define wmb() fast_wmb()
230 #define rmb() fast_rmb()
231 #define mb() wbflush()
232 #define iob() wbflush()
233
234 #else /* !CONFIG_CPU_HAS_WB */
235
236 #define wmb() fast_wmb()
237 #define rmb() fast_rmb()
238 #define mb() fast_mb()
239 #define iob() fast_iob()
240
241 #endif /* !CONFIG_CPU_HAS_WB */
242
243 #ifdef CONFIG_SMP
244 #define smp_mb() mb()
245 #define smp_rmb() rmb()
246 #define smp_wmb() wmb()
247 #else
248 #define smp_mb() barrier()
249 #define smp_rmb() barrier()
250 #define smp_wmb() barrier()
251 #endif
252
253 #define set_mb(var, value) \
254 do { var = value; mb(); } while (0)
255
256 #define set_wmb(var, value) \
257 do { var = value; wmb(); } while (0)
258
259 /*
260 * switch_to(n) should switch tasks to task nr n, first
261 * checking that n isn't the current task, in which case it does nothing.
262 */
263 extern asmlinkage void *resume(void *last, void *next);
264
265 #define prepare_to_switch() do { } while(0)
266
267 struct task_struct;
268
269 #define switch_to(prev,next,last) \
270 do { \
271 (last) = resume(prev, next); \
272 } while(0)
273
274 /*
275 * For 32 and 64 bit operands we can take advantage of ll and sc.
276 * FIXME: This doesn't work for R3000 machines.
277 */
xchg_u32(volatile int * m,unsigned long val)278 static __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
279 {
280 #ifdef CONFIG_CPU_HAS_LLSC
281 unsigned long dummy;
282
283 __asm__ __volatile__(
284 ".set\tpush\t\t\t\t# xchg_u32\n\t"
285 ".set\tnoreorder\n\t"
286 ".set\tnomacro\n\t"
287 "ll\t%0, %3\n"
288 "1:\tmove\t%2, %z4\n\t"
289 "sc\t%2, %1\n\t"
290 "beqzl\t%2, 1b\n\t"
291 " ll\t%0, %3\n\t"
292 "sync\n\t"
293 ".set\tpop"
294 : "=&r" (val), "=m" (*m), "=&r" (dummy)
295 : "R" (*m), "Jr" (val)
296 : "memory");
297
298 return val;
299 #else
300 unsigned long flags, retval;
301
302 local_irq_save(flags);
303 retval = *m;
304 *m = val;
305 local_irq_restore(flags); /* implies memory barrier */
306 return retval;
307 #endif /* Processor-dependent optimization */
308 }
309
310 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
311 #define tas(ptr) (xchg((ptr),1))
312
313 static __inline__ unsigned long
__xchg(unsigned long x,volatile void * ptr,int size)314 __xchg(unsigned long x, volatile void * ptr, int size)
315 {
316 switch (size) {
317 case 4:
318 return xchg_u32(ptr, x);
319 }
320 return x;
321 }
322
323 extern void *set_except_vector(int n, void *addr);
324 extern void per_cpu_trap_init(void);
325
326 extern void __die(const char *, struct pt_regs *, const char *file,
327 const char *func, unsigned long line) __attribute__((noreturn));
328 extern void __die_if_kernel(const char *, struct pt_regs *, const char *file,
329 const char *func, unsigned long line);
330
331 #define die(msg, regs) \
332 __die(msg, regs, __FILE__ ":", __FUNCTION__, __LINE__)
333 #define die_if_kernel(msg, regs) \
334 __die_if_kernel(msg, regs, __FILE__ ":", __FUNCTION__, __LINE__)
335
336 #endif /* _ASM_SYSTEM_H */
337