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1da177e4 LT |
1 | #ifndef __ASM_SH_SYSTEM_H |
2 | #define __ASM_SH_SYSTEM_H | |
3 | ||
4 | /* | |
5 | * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
6 | * Copyright (C) 2002 Paul Mundt | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | |
10 | /* | |
11 | * switch_to() should switch tasks to task nr n, first | |
12 | */ | |
13 | ||
14 | #define switch_to(prev, next, last) do { \ | |
36c8b586 | 15 | struct task_struct *__last; \ |
1da177e4 LT |
16 | register unsigned long *__ts1 __asm__ ("r1") = &prev->thread.sp; \ |
17 | register unsigned long *__ts2 __asm__ ("r2") = &prev->thread.pc; \ | |
18 | register unsigned long *__ts4 __asm__ ("r4") = (unsigned long *)prev; \ | |
19 | register unsigned long *__ts5 __asm__ ("r5") = (unsigned long *)next; \ | |
20 | register unsigned long *__ts6 __asm__ ("r6") = &next->thread.sp; \ | |
21 | register unsigned long __ts7 __asm__ ("r7") = next->thread.pc; \ | |
22 | __asm__ __volatile__ (".balign 4\n\t" \ | |
23 | "stc.l gbr, @-r15\n\t" \ | |
24 | "sts.l pr, @-r15\n\t" \ | |
25 | "mov.l r8, @-r15\n\t" \ | |
26 | "mov.l r9, @-r15\n\t" \ | |
27 | "mov.l r10, @-r15\n\t" \ | |
28 | "mov.l r11, @-r15\n\t" \ | |
29 | "mov.l r12, @-r15\n\t" \ | |
30 | "mov.l r13, @-r15\n\t" \ | |
31 | "mov.l r14, @-r15\n\t" \ | |
32 | "mov.l r15, @r1 ! save SP\n\t" \ | |
33 | "mov.l @r6, r15 ! change to new stack\n\t" \ | |
34 | "mova 1f, %0\n\t" \ | |
35 | "mov.l %0, @r2 ! save PC\n\t" \ | |
36 | "mov.l 2f, %0\n\t" \ | |
37 | "jmp @%0 ! call __switch_to\n\t" \ | |
38 | " lds r7, pr ! with return to new PC\n\t" \ | |
39 | ".balign 4\n" \ | |
40 | "2:\n\t" \ | |
41 | ".long __switch_to\n" \ | |
42 | "1:\n\t" \ | |
43 | "mov.l @r15+, r14\n\t" \ | |
44 | "mov.l @r15+, r13\n\t" \ | |
45 | "mov.l @r15+, r12\n\t" \ | |
46 | "mov.l @r15+, r11\n\t" \ | |
47 | "mov.l @r15+, r10\n\t" \ | |
48 | "mov.l @r15+, r9\n\t" \ | |
49 | "mov.l @r15+, r8\n\t" \ | |
50 | "lds.l @r15+, pr\n\t" \ | |
51 | "ldc.l @r15+, gbr\n\t" \ | |
52 | : "=z" (__last) \ | |
53 | : "r" (__ts1), "r" (__ts2), "r" (__ts4), \ | |
54 | "r" (__ts5), "r" (__ts6), "r" (__ts7) \ | |
55 | : "r3", "t"); \ | |
56 | last = __last; \ | |
57 | } while (0) | |
58 | ||
4dc7a0bb IM |
59 | /* |
60 | * On SMP systems, when the scheduler does migration-cost autodetection, | |
61 | * it needs a way to flush as much of the CPU's caches as possible. | |
62 | * | |
63 | * TODO: fill this in! | |
64 | */ | |
65 | static inline void sched_cacheflush(void) | |
66 | { | |
67 | } | |
68 | ||
1da177e4 LT |
69 | #define nop() __asm__ __volatile__ ("nop") |
70 | ||
71 | ||
72 | #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) | |
73 | ||
74 | static __inline__ unsigned long tas(volatile int *m) | |
75 | { /* #define tas(ptr) (xchg((ptr),1)) */ | |
76 | unsigned long retval; | |
77 | ||
78 | __asm__ __volatile__ ("tas.b @%1\n\t" | |
79 | "movt %0" | |
80 | : "=r" (retval): "r" (m): "t", "memory"); | |
81 | return retval; | |
82 | } | |
83 | ||
84 | extern void __xchg_called_with_bad_pointer(void); | |
85 | ||
86 | #define mb() __asm__ __volatile__ ("": : :"memory") | |
87 | #define rmb() mb() | |
88 | #define wmb() __asm__ __volatile__ ("": : :"memory") | |
89 | #define read_barrier_depends() do { } while(0) | |
90 | ||
91 | #ifdef CONFIG_SMP | |
92 | #define smp_mb() mb() | |
93 | #define smp_rmb() rmb() | |
94 | #define smp_wmb() wmb() | |
95 | #define smp_read_barrier_depends() read_barrier_depends() | |
96 | #else | |
97 | #define smp_mb() barrier() | |
98 | #define smp_rmb() barrier() | |
99 | #define smp_wmb() barrier() | |
100 | #define smp_read_barrier_depends() do { } while(0) | |
101 | #endif | |
102 | ||
103 | #define set_mb(var, value) do { xchg(&var, value); } while (0) | |
1da177e4 LT |
104 | |
105 | /* Interrupt Control */ | |
106 | static __inline__ void local_irq_enable(void) | |
107 | { | |
108 | unsigned long __dummy0, __dummy1; | |
109 | ||
110 | __asm__ __volatile__("stc sr, %0\n\t" | |
111 | "and %1, %0\n\t" | |
112 | "stc r6_bank, %1\n\t" | |
113 | "or %1, %0\n\t" | |
114 | "ldc %0, sr" | |
115 | : "=&r" (__dummy0), "=r" (__dummy1) | |
116 | : "1" (~0x000000f0) | |
117 | : "memory"); | |
118 | } | |
119 | ||
120 | static __inline__ void local_irq_disable(void) | |
121 | { | |
122 | unsigned long __dummy; | |
123 | __asm__ __volatile__("stc sr, %0\n\t" | |
124 | "or #0xf0, %0\n\t" | |
125 | "ldc %0, sr" | |
126 | : "=&z" (__dummy) | |
127 | : /* no inputs */ | |
128 | : "memory"); | |
129 | } | |
130 | ||
131 | #define local_save_flags(x) \ | |
132 | __asm__("stc sr, %0; and #0xf0, %0" : "=&z" (x) :/**/: "memory" ) | |
133 | ||
134 | #define irqs_disabled() \ | |
135 | ({ \ | |
136 | unsigned long flags; \ | |
137 | local_save_flags(flags); \ | |
138 | (flags != 0); \ | |
139 | }) | |
140 | ||
141 | static __inline__ unsigned long local_irq_save(void) | |
142 | { | |
143 | unsigned long flags, __dummy; | |
144 | ||
145 | __asm__ __volatile__("stc sr, %1\n\t" | |
146 | "mov %1, %0\n\t" | |
147 | "or #0xf0, %0\n\t" | |
148 | "ldc %0, sr\n\t" | |
149 | "mov %1, %0\n\t" | |
150 | "and #0xf0, %0" | |
151 | : "=&z" (flags), "=&r" (__dummy) | |
152 | :/**/ | |
153 | : "memory" ); | |
154 | return flags; | |
155 | } | |
156 | ||
157 | #ifdef DEBUG_CLI_STI | |
158 | static __inline__ void local_irq_restore(unsigned long x) | |
159 | { | |
160 | if ((x & 0x000000f0) != 0x000000f0) | |
161 | local_irq_enable(); | |
162 | else { | |
163 | unsigned long flags; | |
164 | local_save_flags(flags); | |
165 | ||
166 | if (flags == 0) { | |
167 | extern void dump_stack(void); | |
168 | printk(KERN_ERR "BUG!\n"); | |
169 | dump_stack(); | |
170 | local_irq_disable(); | |
171 | } | |
172 | } | |
173 | } | |
174 | #else | |
175 | #define local_irq_restore(x) do { \ | |
176 | if ((x & 0x000000f0) != 0x000000f0) \ | |
177 | local_irq_enable(); \ | |
178 | } while (0) | |
179 | #endif | |
180 | ||
181 | #define really_restore_flags(x) do { \ | |
182 | if ((x & 0x000000f0) != 0x000000f0) \ | |
183 | local_irq_enable(); \ | |
184 | else \ | |
185 | local_irq_disable(); \ | |
186 | } while (0) | |
187 | ||
188 | /* | |
189 | * Jump to P2 area. | |
190 | * When handling TLB or caches, we need to do it from P2 area. | |
191 | */ | |
192 | #define jump_to_P2() \ | |
193 | do { \ | |
194 | unsigned long __dummy; \ | |
195 | __asm__ __volatile__( \ | |
196 | "mov.l 1f, %0\n\t" \ | |
197 | "or %1, %0\n\t" \ | |
198 | "jmp @%0\n\t" \ | |
199 | " nop\n\t" \ | |
200 | ".balign 4\n" \ | |
201 | "1: .long 2f\n" \ | |
202 | "2:" \ | |
203 | : "=&r" (__dummy) \ | |
204 | : "r" (0x20000000)); \ | |
205 | } while (0) | |
206 | ||
207 | /* | |
208 | * Back to P1 area. | |
209 | */ | |
210 | #define back_to_P1() \ | |
211 | do { \ | |
212 | unsigned long __dummy; \ | |
213 | __asm__ __volatile__( \ | |
214 | "nop;nop;nop;nop;nop;nop;nop\n\t" \ | |
215 | "mov.l 1f, %0\n\t" \ | |
216 | "jmp @%0\n\t" \ | |
217 | " nop\n\t" \ | |
218 | ".balign 4\n" \ | |
219 | "1: .long 2f\n" \ | |
220 | "2:" \ | |
221 | : "=&r" (__dummy)); \ | |
222 | } while (0) | |
223 | ||
224 | /* For spinlocks etc */ | |
225 | #define local_irq_save(x) x = local_irq_save() | |
226 | ||
227 | static __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val) | |
228 | { | |
229 | unsigned long flags, retval; | |
230 | ||
231 | local_irq_save(flags); | |
232 | retval = *m; | |
233 | *m = val; | |
234 | local_irq_restore(flags); | |
235 | return retval; | |
236 | } | |
237 | ||
238 | static __inline__ unsigned long xchg_u8(volatile unsigned char * m, unsigned long val) | |
239 | { | |
240 | unsigned long flags, retval; | |
241 | ||
242 | local_irq_save(flags); | |
243 | retval = *m; | |
244 | *m = val & 0xff; | |
245 | local_irq_restore(flags); | |
246 | return retval; | |
247 | } | |
248 | ||
249 | static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size) | |
250 | { | |
251 | switch (size) { | |
252 | case 4: | |
253 | return xchg_u32(ptr, x); | |
254 | break; | |
255 | case 1: | |
256 | return xchg_u8(ptr, x); | |
257 | break; | |
258 | } | |
259 | __xchg_called_with_bad_pointer(); | |
260 | return x; | |
261 | } | |
262 | ||
263 | /* XXX | |
264 | * disable hlt during certain critical i/o operations | |
265 | */ | |
266 | #define HAVE_DISABLE_HLT | |
267 | void disable_hlt(void); | |
268 | void enable_hlt(void); | |
269 | ||
270 | #define arch_align_stack(x) (x) | |
271 | ||
272 | #endif |