Merge branch 'master' of git://git.kernel.org/pub/scm/fs/xfs/xfs
[sfrench/cifs-2.6.git] / arch / microblaze / include / asm / system.h
1 /*
2  * Copyright (C) 2006 Atmark Techno, Inc.
3  *
4  * This file is subject to the terms and conditions of the GNU General Public
5  * License. See the file "COPYING" in the main directory of this archive
6  * for more details.
7  */
8
9 #ifndef _ASM_MICROBLAZE_SYSTEM_H
10 #define _ASM_MICROBLAZE_SYSTEM_H
11
12 #include <asm/registers.h>
13 #include <asm/setup.h>
14 #include <asm/irqflags.h>
15
16 struct task_struct;
17 struct thread_info;
18
19 extern struct task_struct *_switch_to(struct thread_info *prev,
20                                         struct thread_info *next);
21
22 #define switch_to(prev, next, last)                                     \
23         do {                                                            \
24                 (last) = _switch_to(task_thread_info(prev),             \
25                                         task_thread_info(next));        \
26         } while (0)
27
28 #define smp_read_barrier_depends()      do {} while (0)
29 #define read_barrier_depends()          do {} while (0)
30
31 #define nop()                   asm volatile ("nop")
32 #define mb()                    barrier()
33 #define rmb()                   mb()
34 #define wmb()                   mb()
35 #define set_mb(var, value)      do { var = value; mb(); } while (0)
36 #define set_wmb(var, value)     do { var = value; wmb(); } while (0)
37
38 #define smp_mb()                mb()
39 #define smp_rmb()               rmb()
40 #define smp_wmb()               wmb()
41
42 void show_trace(struct task_struct *task, unsigned long *stack);
43 void __bad_xchg(volatile void *ptr, int size);
44
45 static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
46                                                                 int size)
47 {
48         unsigned long ret;
49         unsigned long flags;
50
51         switch (size) {
52         case 1:
53                 local_irq_save(flags);
54                 ret = *(volatile unsigned char *)ptr;
55                 *(volatile unsigned char *)ptr = x;
56                 local_irq_restore(flags);
57                 break;
58
59         case 4:
60                 local_irq_save(flags);
61                 ret = *(volatile unsigned long *)ptr;
62                 *(volatile unsigned long *)ptr = x;
63                 local_irq_restore(flags);
64                 break;
65         default:
66                 __bad_xchg(ptr, size), ret = 0;
67                 break;
68         }
69
70         return ret;
71 }
72
73 void disable_hlt(void);
74 void enable_hlt(void);
75 void default_idle(void);
76
77 #define xchg(ptr, x) \
78         ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
79
80 void free_init_pages(char *what, unsigned long begin, unsigned long end);
81 void free_initmem(void);
82 extern char *klimit;
83 extern void ret_from_fork(void);
84
85 #ifdef CONFIG_DEBUG_FS
86 extern struct dentry *of_debugfs_root;
87 #endif
88
89 #define arch_align_stack(x) (x)
90
91 #endif /* _ASM_MICROBLAZE_SYSTEM_H */