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16#ifndef _ASM_SYSTEM_H
17#define _ASM_SYSTEM_H
18
19#include <linux/config.h>
20#include <asm/sgidefs.h>
21#include <asm/ptrace.h>
22#if 0
23#include <linux/kernel.h>
24#endif
25
26extern __inline__ void
27__sti(void)
28{
29 __asm__ __volatile__(
30 ".set\tpush\n\t"
31 ".set\treorder\n\t"
32 ".set\tnoat\n\t"
33 "mfc0\t$1,$12\n\t"
34 "ori\t$1,0x1f\n\t"
35 "xori\t$1,0x1e\n\t"
36 "mtc0\t$1,$12\n\t"
37 ".set\tpop\n\t"
38 :
39 :
40 : "$1", "memory");
41}
42
43
44
45
46
47
48
49
50extern __inline__ void
51__cli(void)
52{
53 __asm__ __volatile__(
54 ".set\tpush\n\t"
55 ".set\treorder\n\t"
56 ".set\tnoat\n\t"
57 "mfc0\t$1,$12\n\t"
58 "ori\t$1,1\n\t"
59 "xori\t$1,1\n\t"
60 ".set\tnoreorder\n\t"
61 "mtc0\t$1,$12\n\t"
62 "nop\n\t"
63 "nop\n\t"
64 "nop\n\t"
65 ".set\tpop\n\t"
66 :
67 :
68 : "$1", "memory");
69}
70
71#define __save_flags(x) \
72__asm__ __volatile__( \
73 ".set\tpush\n\t" \
74 ".set\treorder\n\t" \
75 "mfc0\t%0,$12\n\t" \
76 ".set\tpop\n\t" \
77 : "=r" (x))
78
79#define __save_and_cli(x) \
80__asm__ __volatile__( \
81 ".set\tpush\n\t" \
82 ".set\treorder\n\t" \
83 ".set\tnoat\n\t" \
84 "mfc0\t%0,$12\n\t" \
85 "ori\t$1,%0,1\n\t" \
86 "xori\t$1,1\n\t" \
87 ".set\tnoreorder\n\t" \
88 "mtc0\t$1,$12\n\t" \
89 "nop\n\t" \
90 "nop\n\t" \
91 "nop\n\t" \
92 ".set\tpop\n\t" \
93 : "=r" (x) \
94 : \
95 : "$1", "memory")
96
97#define __restore_flags(flags) \
98do { \
99 unsigned long __tmp1; \
100 \
101 __asm__ __volatile__( \
102 ".set\tnoreorder\t\t\t# __restore_flags\n\t" \
103 ".set\tnoat\n\t" \
104 "mfc0\t$1, $12\n\t" \
105 "andi\t%0, 1\n\t" \
106 "ori\t$1, 1\n\t" \
107 "xori\t$1, 1\n\t" \
108 "or\t%0, $1\n\t" \
109 "mtc0\t%0, $12\n\t" \
110 "nop\n\t" \
111 "nop\n\t" \
112 "nop\n\t" \
113 ".set\tat\n\t" \
114 ".set\treorder" \
115 : "=r" (__tmp1) \
116 : "0" (flags) \
117 : "$1", "memory"); \
118} while(0)
119
120#ifdef CONFIG_SMP
121
122extern void __global_sti(void);
123extern void __global_cli(void);
124extern unsigned long __global_save_flags(void);
125extern void __global_restore_flags(unsigned long);
126# define sti() __global_sti()
127# define cli() __global_cli()
128# define save_flags(x) do { x = __global_save_flags(); } while (0)
129# define restore_flags(x) __global_restore_flags(x)
130# define save_and_cli(x) do { save_flags(x); cli(); } while(0)
131
132#else
133
134# define sti() __sti()
135# define cli() __cli()
136# define save_flags(x) __save_flags(x)
137# define save_and_cli(x) __save_and_cli(x)
138# define restore_flags(x) __restore_flags(x)
139
140#endif
141
142
143#define local_irq_save(x) __save_and_cli(x);
144#define local_irq_restore(x) __restore_flags(x);
145#define local_irq_disable() __cli();
146#define local_irq_enable() __sti();
147
148
149
150
151#ifdef CONFIG_CPU_HAS_WB
152
153#include <asm/wbflush.h>
154#define rmb() do { } while(0)
155#define wmb() wbflush()
156#define mb() wbflush()
157
158#else
159
160#define mb() \
161__asm__ __volatile__( \
162 "# prevent instructions being moved around\n\t" \
163 ".set\tnoreorder\n\t" \
164 "# 8 nops to fool the R4400 pipeline\n\t" \
165 "nop;nop;nop;nop;nop;nop;nop;nop\n\t" \
166 ".set\treorder" \
167 : \
168 : \
169 : "memory")
170#define rmb() mb()
171#define wmb() mb()
172
173#endif
174
175#ifdef CONFIG_SMP
176#define smp_mb() mb()
177#define smp_rmb() rmb()
178#define smp_wmb() wmb()
179#else
180#define smp_mb() barrier()
181#define smp_rmb() barrier()
182#define smp_wmb() barrier()
183#endif
184
185#define set_mb(var, value) \
186do { var = value; mb(); } while (0)
187
188#define set_wmb(var, value) \
189do { var = value; wmb(); } while (0)
190
191#if !defined (_LANGUAGE_ASSEMBLY)
192
193
194
195
196#if 0
197extern asmlinkage void *resume(void *last, void *next);
198#endif
199#endif
200
201#define prepare_to_switch() do { } while(0)
202#define switch_to(prev,next,last) \
203do { \
204 (last) = resume(prev, next); \
205} while(0)
206
207
208
209
210
211extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
212{
213#ifdef CONFIG_CPU_HAS_LLSC
214 unsigned long dummy;
215
216 __asm__ __volatile__(
217 ".set\tnoreorder\t\t\t# xchg_u32\n\t"
218 ".set\tnoat\n\t"
219 "ll\t%0, %3\n"
220 "1:\tmove\t$1, %2\n\t"
221 "sc\t$1, %1\n\t"
222 "beqzl\t$1, 1b\n\t"
223 " ll\t%0, %3\n\t"
224 ".set\tat\n\t"
225 ".set\treorder"
226 : "=r" (val), "=o" (*m), "=r" (dummy)
227 : "o" (*m), "2" (val)
228 : "memory");
229
230 return val;
231#else
232 unsigned long flags, retval;
233
234 save_flags(flags);
235 cli();
236 retval = *m;
237 *m = val;
238 restore_flags(flags);
239 return retval;
240#endif
241}
242
243#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
244#define tas(ptr) (xchg((ptr),1))
245
246static __inline__ unsigned long
247__xchg(unsigned long x, volatile void * ptr, int size)
248{
249 switch (size) {
250 case 4:
251 return xchg_u32(ptr, x);
252 }
253 return x;
254}
255
256extern void *set_except_vector(int n, void *addr);
257
258extern void __die(const char *, struct pt_regs *, const char *where,
259 unsigned long line) __attribute__((noreturn));
260extern void __die_if_kernel(const char *, struct pt_regs *, const char *where,
261 unsigned long line);
262
263#define die(msg, regs) \
264 __die(msg, regs, __FILE__ ":"__FUNCTION__, __LINE__)
265#define die_if_kernel(msg, regs) \
266 __die_if_kernel(msg, regs, __FILE__ ":"__FUNCTION__, __LINE__)
267
268#endif
269
