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1da177e4 LT |
1 | /* system.h: FR-V CPU control definitions |
2 | * | |
3 | * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #ifndef _ASM_SYSTEM_H | |
13 | #define _ASM_SYSTEM_H | |
14 | ||
1da177e4 LT |
15 | #include <linux/linkage.h> |
16 | #include <asm/atomic.h> | |
17 | ||
18 | struct thread_struct; | |
19 | ||
1da177e4 LT |
20 | /* |
21 | * switch_to(prev, next) should switch from task `prev' to `next' | |
22 | * `prev' will never be the same as `next'. | |
23 | * The `mb' is to tell GCC not to cache `current' across this call. | |
24 | */ | |
25 | extern asmlinkage | |
26 | struct task_struct *__switch_to(struct thread_struct *prev_thread, | |
27 | struct thread_struct *next_thread, | |
28 | struct task_struct *prev); | |
29 | ||
30 | #define switch_to(prev, next, last) \ | |
31 | do { \ | |
32 | (prev)->thread.sched_lr = \ | |
33 | (unsigned long) __builtin_return_address(0); \ | |
34 | (last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \ | |
35 | mb(); \ | |
36 | } while(0) | |
37 | ||
38 | /* | |
39 | * interrupt flag manipulation | |
28baebae DH |
40 | * - use virtual interrupt management since touching the PSR is slow |
41 | * - ICC2.Z: T if interrupts virtually disabled | |
42 | * - ICC2.C: F if interrupts really disabled | |
43 | * - if Z==1 upon interrupt: | |
44 | * - C is set to 0 | |
45 | * - interrupts are really disabled | |
46 | * - entry.S returns immediately | |
47 | * - uses TIHI (TRAP if Z==0 && C==0) #2 to really reenable interrupts | |
48 | * - if taken, the trap: | |
49 | * - sets ICC2.C | |
50 | * - enables interrupts | |
1da177e4 | 51 | */ |
28baebae DH |
52 | #define local_irq_disable() \ |
53 | do { \ | |
54 | /* set Z flag, but don't change the C flag */ \ | |
55 | asm volatile(" andcc gr0,gr0,gr0,icc2 \n" \ | |
56 | : \ | |
57 | : \ | |
58 | : "memory", "icc2" \ | |
59 | ); \ | |
60 | } while(0) | |
61 | ||
62 | #define local_irq_enable() \ | |
63 | do { \ | |
64 | /* clear Z flag and then test the C flag */ \ | |
65 | asm volatile(" oricc gr0,#1,gr0,icc2 \n" \ | |
66 | " tihi icc2,gr0,#2 \n" \ | |
67 | : \ | |
68 | : \ | |
69 | : "memory", "icc2" \ | |
70 | ); \ | |
71 | } while(0) | |
72 | ||
73 | #define local_save_flags(flags) \ | |
74 | do { \ | |
75 | typecheck(unsigned long, flags); \ | |
76 | asm volatile("movsg ccr,%0" \ | |
77 | : "=r"(flags) \ | |
78 | : \ | |
79 | : "memory"); \ | |
80 | \ | |
81 | /* shift ICC2.Z to bit 0 */ \ | |
82 | flags >>= 26; \ | |
83 | \ | |
84 | /* make flags 1 if interrupts disabled, 0 otherwise */ \ | |
85 | flags &= 1UL; \ | |
86 | } while(0) | |
87 | ||
88 | #define irqs_disabled() \ | |
89 | ({unsigned long flags; local_save_flags(flags); flags; }) | |
90 | ||
91 | #define local_irq_save(flags) \ | |
92 | do { \ | |
93 | typecheck(unsigned long, flags); \ | |
94 | local_save_flags(flags); \ | |
95 | local_irq_disable(); \ | |
96 | } while(0) | |
97 | ||
98 | #define local_irq_restore(flags) \ | |
99 | do { \ | |
100 | typecheck(unsigned long, flags); \ | |
101 | \ | |
102 | /* load the Z flag by turning 1 if disabled into 0 if disabled \ | |
103 | * and thus setting the Z flag but not the C flag */ \ | |
104 | asm volatile(" xoricc %0,#1,gr0,icc2 \n" \ | |
105 | /* then test Z=0 and C=0 */ \ | |
106 | " tihi icc2,gr0,#2 \n" \ | |
107 | : \ | |
108 | : "r"(flags) \ | |
109 | : "memory", "icc2" \ | |
110 | ); \ | |
111 | \ | |
112 | } while(0) | |
113 | ||
114 | /* | |
115 | * real interrupt flag manipulation | |
116 | */ | |
117 | #define __local_irq_disable() \ | |
1da177e4 LT |
118 | do { \ |
119 | unsigned long psr; \ | |
120 | asm volatile(" movsg psr,%0 \n" \ | |
121 | " andi %0,%2,%0 \n" \ | |
122 | " ori %0,%1,%0 \n" \ | |
123 | " movgs %0,psr \n" \ | |
124 | : "=r"(psr) \ | |
125 | : "i" (PSR_PIL_14), "i" (~PSR_PIL) \ | |
126 | : "memory"); \ | |
127 | } while(0) | |
128 | ||
28baebae | 129 | #define __local_irq_enable() \ |
1da177e4 LT |
130 | do { \ |
131 | unsigned long psr; \ | |
132 | asm volatile(" movsg psr,%0 \n" \ | |
133 | " andi %0,%1,%0 \n" \ | |
134 | " movgs %0,psr \n" \ | |
135 | : "=r"(psr) \ | |
136 | : "i" (~PSR_PIL) \ | |
137 | : "memory"); \ | |
138 | } while(0) | |
139 | ||
28baebae | 140 | #define __local_save_flags(flags) \ |
1da177e4 LT |
141 | do { \ |
142 | typecheck(unsigned long, flags); \ | |
143 | asm("movsg psr,%0" \ | |
144 | : "=r"(flags) \ | |
145 | : \ | |
146 | : "memory"); \ | |
147 | } while(0) | |
148 | ||
28baebae | 149 | #define __local_irq_save(flags) \ |
1da177e4 LT |
150 | do { \ |
151 | unsigned long npsr; \ | |
152 | typecheck(unsigned long, flags); \ | |
153 | asm volatile(" movsg psr,%0 \n" \ | |
154 | " andi %0,%3,%1 \n" \ | |
155 | " ori %1,%2,%1 \n" \ | |
156 | " movgs %1,psr \n" \ | |
157 | : "=r"(flags), "=r"(npsr) \ | |
158 | : "i" (PSR_PIL_14), "i" (~PSR_PIL) \ | |
159 | : "memory"); \ | |
160 | } while(0) | |
161 | ||
28baebae | 162 | #define __local_irq_restore(flags) \ |
1da177e4 LT |
163 | do { \ |
164 | typecheck(unsigned long, flags); \ | |
165 | asm volatile(" movgs %0,psr \n" \ | |
166 | : \ | |
167 | : "r" (flags) \ | |
168 | : "memory"); \ | |
169 | } while(0) | |
170 | ||
28baebae | 171 | #define __irqs_disabled() \ |
1da177e4 LT |
172 | ((__get_PSR() & PSR_PIL) >= PSR_PIL_14) |
173 | ||
174 | /* | |
175 | * Force strict CPU ordering. | |
176 | */ | |
177 | #define nop() asm volatile ("nop"::) | |
178 | #define mb() asm volatile ("membar" : : :"memory") | |
179 | #define rmb() asm volatile ("membar" : : :"memory") | |
180 | #define wmb() asm volatile ("membar" : : :"memory") | |
181 | #define set_mb(var, value) do { var = value; mb(); } while (0) | |
182 | #define set_wmb(var, value) do { var = value; wmb(); } while (0) | |
183 | ||
184 | #define smp_mb() mb() | |
185 | #define smp_rmb() rmb() | |
186 | #define smp_wmb() wmb() | |
187 | ||
188 | #define read_barrier_depends() do {} while(0) | |
189 | #define smp_read_barrier_depends() read_barrier_depends() | |
190 | ||
191 | #define HARD_RESET_NOW() \ | |
192 | do { \ | |
193 | cli(); \ | |
194 | } while(1) | |
195 | ||
196 | extern void die_if_kernel(const char *, ...) __attribute__((format(printf, 1, 2))); | |
197 | extern void free_initmem(void); | |
198 | ||
199 | #define arch_align_stack(x) (x) | |
200 | ||
201 | #endif /* _ASM_SYSTEM_H */ |