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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 | ||
15 | #include <linux/config.h> /* get configuration macros */ | |
16 | #include <linux/linkage.h> | |
17 | #include <asm/atomic.h> | |
18 | ||
19 | struct thread_struct; | |
20 | ||
21 | #define prepare_to_switch() do { } while(0) | |
22 | ||
23 | /* | |
24 | * switch_to(prev, next) should switch from task `prev' to `next' | |
25 | * `prev' will never be the same as `next'. | |
26 | * The `mb' is to tell GCC not to cache `current' across this call. | |
27 | */ | |
28 | extern asmlinkage | |
29 | struct task_struct *__switch_to(struct thread_struct *prev_thread, | |
30 | struct thread_struct *next_thread, | |
31 | struct task_struct *prev); | |
32 | ||
33 | #define switch_to(prev, next, last) \ | |
34 | do { \ | |
35 | (prev)->thread.sched_lr = \ | |
36 | (unsigned long) __builtin_return_address(0); \ | |
37 | (last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \ | |
38 | mb(); \ | |
39 | } while(0) | |
40 | ||
41 | /* | |
42 | * interrupt flag manipulation | |
43 | */ | |
44 | #define local_irq_disable() \ | |
45 | do { \ | |
46 | unsigned long psr; \ | |
47 | asm volatile(" movsg psr,%0 \n" \ | |
48 | " andi %0,%2,%0 \n" \ | |
49 | " ori %0,%1,%0 \n" \ | |
50 | " movgs %0,psr \n" \ | |
51 | : "=r"(psr) \ | |
52 | : "i" (PSR_PIL_14), "i" (~PSR_PIL) \ | |
53 | : "memory"); \ | |
54 | } while(0) | |
55 | ||
56 | #define local_irq_enable() \ | |
57 | do { \ | |
58 | unsigned long psr; \ | |
59 | asm volatile(" movsg psr,%0 \n" \ | |
60 | " andi %0,%1,%0 \n" \ | |
61 | " movgs %0,psr \n" \ | |
62 | : "=r"(psr) \ | |
63 | : "i" (~PSR_PIL) \ | |
64 | : "memory"); \ | |
65 | } while(0) | |
66 | ||
67 | #define local_save_flags(flags) \ | |
68 | do { \ | |
69 | typecheck(unsigned long, flags); \ | |
70 | asm("movsg psr,%0" \ | |
71 | : "=r"(flags) \ | |
72 | : \ | |
73 | : "memory"); \ | |
74 | } while(0) | |
75 | ||
76 | #define local_irq_save(flags) \ | |
77 | do { \ | |
78 | unsigned long npsr; \ | |
79 | typecheck(unsigned long, flags); \ | |
80 | asm volatile(" movsg psr,%0 \n" \ | |
81 | " andi %0,%3,%1 \n" \ | |
82 | " ori %1,%2,%1 \n" \ | |
83 | " movgs %1,psr \n" \ | |
84 | : "=r"(flags), "=r"(npsr) \ | |
85 | : "i" (PSR_PIL_14), "i" (~PSR_PIL) \ | |
86 | : "memory"); \ | |
87 | } while(0) | |
88 | ||
89 | #define local_irq_restore(flags) \ | |
90 | do { \ | |
91 | typecheck(unsigned long, flags); \ | |
92 | asm volatile(" movgs %0,psr \n" \ | |
93 | : \ | |
94 | : "r" (flags) \ | |
95 | : "memory"); \ | |
96 | } while(0) | |
97 | ||
98 | #define irqs_disabled() \ | |
99 | ((__get_PSR() & PSR_PIL) >= PSR_PIL_14) | |
100 | ||
101 | /* | |
102 | * Force strict CPU ordering. | |
103 | */ | |
104 | #define nop() asm volatile ("nop"::) | |
105 | #define mb() asm volatile ("membar" : : :"memory") | |
106 | #define rmb() asm volatile ("membar" : : :"memory") | |
107 | #define wmb() asm volatile ("membar" : : :"memory") | |
108 | #define set_mb(var, value) do { var = value; mb(); } while (0) | |
109 | #define set_wmb(var, value) do { var = value; wmb(); } while (0) | |
110 | ||
111 | #define smp_mb() mb() | |
112 | #define smp_rmb() rmb() | |
113 | #define smp_wmb() wmb() | |
114 | ||
115 | #define read_barrier_depends() do {} while(0) | |
116 | #define smp_read_barrier_depends() read_barrier_depends() | |
117 | ||
118 | #define HARD_RESET_NOW() \ | |
119 | do { \ | |
120 | cli(); \ | |
121 | } while(1) | |
122 | ||
123 | extern void die_if_kernel(const char *, ...) __attribute__((format(printf, 1, 2))); | |
124 | extern void free_initmem(void); | |
125 | ||
126 | #define arch_align_stack(x) (x) | |
127 | ||
128 | #endif /* _ASM_SYSTEM_H */ |