summaryrefslogtreecommitdiffstats
path: root/include/asm-frv/system.h
blob: d2aea70a5f64cc0ef37e55275394c06f1ad4b34b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
/* system.h: FR-V CPU control definitions
 *
 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifndef _ASM_SYSTEM_H
#define _ASM_SYSTEM_H

#include <linux/config.h> /* get configuration macros */
#include <linux/linkage.h>
#include <asm/atomic.h>

struct thread_struct;

#define prepare_to_switch()    do { } while(0)

/*
 * switch_to(prev, next) should switch from task `prev' to `next'
 * `prev' will never be the same as `next'.
 * The `mb' is to tell GCC not to cache `current' across this call.
 */
extern asmlinkage
struct task_struct *__switch_to(struct thread_struct *prev_thread,
				struct thread_struct *next_thread,
				struct task_struct *prev);

#define switch_to(prev, next, last)					\
do {									\
	(prev)->thread.sched_lr =					\
		(unsigned long) __builtin_return_address(0);		\
	(last) = __switch_to(&(prev)->thread, &(next)->thread, (prev));	\
	mb();								\
} while(0)

/*
 * interrupt flag manipulation
 */
#define local_irq_disable()				\
do {							\
	unsigned long psr;				\
	asm volatile("	movsg	psr,%0		\n"	\
		     "	andi	%0,%2,%0	\n"	\
		     "	ori	%0,%1,%0	\n"	\
		     "	movgs	%0,psr		\n"	\
		     : "=r"(psr)			\
		     : "i" (PSR_PIL_14), "i" (~PSR_PIL)	\
		     : "memory");			\
} while(0)

#define local_irq_enable()				\
do {							\
	unsigned long psr;				\
	asm volatile("	movsg	psr,%0		\n"	\
		     "	andi	%0,%1,%0	\n"	\
		     "	movgs	%0,psr		\n"	\
		     : "=r"(psr)			\
		     : "i" (~PSR_PIL)			\
		     : "memory");			\
} while(0)

#define local_save_flags(flags)			\
do {						\
	typecheck(unsigned long, flags);	\
	asm("movsg psr,%0"			\
	    : "=r"(flags)			\
	    :					\
	    : "memory");			\
} while(0)

#define	local_irq_save(flags)				\
do {							\
	unsigned long npsr;				\
	typecheck(unsigned long, flags);		\
	asm volatile("	movsg	psr,%0		\n"	\
		     "	andi	%0,%3,%1	\n"	\
		     "	ori	%1,%2,%1	\n"	\
		     "	movgs	%1,psr		\n"	\
		     : "=r"(flags), "=r"(npsr)		\
		     : "i" (PSR_PIL_14), "i" (~PSR_PIL)	\
		     : "memory");			\
} while(0)

#define	local_irq_restore(flags)			\
do {							\
	typecheck(unsigned long, flags);		\
	asm volatile("	movgs	%0,psr		\n"	\
		     :					\
		     : "r" (flags)			\
		     : "memory");			\
} while(0)

#define irqs_disabled() \
	((__get_PSR() & PSR_PIL) >= PSR_PIL_14)

/*
 * Force strict CPU ordering.
 */
#define nop()			asm volatile ("nop"::)
#define mb()			asm volatile ("membar" : : :"memory")
#define rmb()			asm volatile ("membar" : : :"memory")
#define wmb()			asm volatile ("membar" : : :"memory")
#define set_mb(var, value)	do { var = value; mb(); } while (0)
#define set_wmb(var, value)	do { var = value; wmb(); } while (0)

#define smp_mb()		mb()
#define smp_rmb()		rmb()
#define smp_wmb()		wmb()

#define read_barrier_depends()		do {} while(0)
#define smp_read_barrier_depends()	read_barrier_depends()

#define HARD_RESET_NOW()			\
do {						\
	cli();					\
} while(1)

extern void die_if_kernel(const char *, ...) __attribute__((format(printf, 1, 2)));
extern void free_initmem(void);

#define arch_align_stack(x) (x)

#endif /* _ASM_SYSTEM_H */