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1 | /* Generic system definitions, based on MN10300 definitions. |
2 | * |
3 | * It should be possible to use these on really simple architectures, |
4 | * but it serves more as a starting point for new ports. |
5 | * |
6 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
7 | * Written by David Howells (dhowells@redhat.com) |
8 | * |
9 | * This program is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU General Public Licence |
11 | * as published by the Free Software Foundation; either version |
12 | * 2 of the Licence, or (at your option) any later version. |
13 | */ |
14 | #ifndef __ASM_GENERIC_SYSTEM_H |
15 | #define __ASM_GENERIC_SYSTEM_H |
16 | |
17 | #ifdef __KERNEL__ |
18 | #ifndef __ASSEMBLY__ |
19 | |
20 | #include <linux/types.h> |
21 | #include <linux/irqflags.h> |
22 | |
23 | #include <asm/cmpxchg-local.h> |
24 | #include <asm/cmpxchg.h> |
25 | |
26 | struct task_struct; |
27 | |
28 | /* context switching is now performed out-of-line in switch_to.S */ |
29 | extern struct task_struct *__switch_to(struct task_struct *, |
30 | struct task_struct *); |
31 | #define switch_to(prev, next, last) \ |
32 | do { \ |
33 | ((last) = __switch_to((prev), (next))); \ |
34 | } while (0) |
35 | |
36 | #define arch_align_stack(x) (x) |
37 | |
38 | #define nop() asm volatile ("nop") |
39 | |
40 | #endif /* !__ASSEMBLY__ */ |
41 | |
42 | /* |
43 | * Force strict CPU ordering. |
44 | * And yes, this is required on UP too when we're talking |
45 | * to devices. |
46 | * |
47 | * This implementation only contains a compiler barrier. |
48 | */ |
49 | |
50 | #define mb() asm volatile ("": : :"memory") |
51 | #define rmb() mb() |
52 | #define wmb() asm volatile ("": : :"memory") |
53 | |
54 | #ifdef CONFIG_SMP |
55 | #define smp_mb() mb() |
56 | #define smp_rmb() rmb() |
57 | #define smp_wmb() wmb() |
58 | #else |
59 | #define smp_mb() barrier() |
60 | #define smp_rmb() barrier() |
61 | #define smp_wmb() barrier() |
62 | #endif |
63 | |
64 | #define set_mb(var, value) do { var = value; mb(); } while (0) |
65 | #define set_wmb(var, value) do { var = value; wmb(); } while (0) |
66 | |
67 | #define read_barrier_depends() do {} while (0) |
68 | #define smp_read_barrier_depends() do {} while (0) |
69 | |
70 | /* |
71 | * we make sure local_irq_enable() doesn't cause priority inversion |
72 | */ |
73 | #ifndef __ASSEMBLY__ |
74 | |
75 | /* This function doesn't exist, so you'll get a linker error |
76 | * if something tries to do an invalid xchg(). */ |
77 | extern void __xchg_called_with_bad_pointer(void); |
78 | |
79 | static inline |
80 | unsigned long __xchg(unsigned long x, volatile void *ptr, int size) |
81 | { |
82 | unsigned long ret, flags; |
83 | |
84 | switch (size) { |
85 | case 1: |
86 | #ifdef __xchg_u8 |
87 | return __xchg_u8(x, ptr); |
88 | #else |
89 | local_irq_save(flags); |
90 | ret = *(volatile u8 *)ptr; |
91 | *(volatile u8 *)ptr = x; |
92 | local_irq_restore(flags); |
93 | return ret; |
94 | #endif /* __xchg_u8 */ |
95 | |
96 | case 2: |
97 | #ifdef __xchg_u16 |
98 | return __xchg_u16(x, ptr); |
99 | #else |
100 | local_irq_save(flags); |
101 | ret = *(volatile u16 *)ptr; |
102 | *(volatile u16 *)ptr = x; |
103 | local_irq_restore(flags); |
104 | return ret; |
105 | #endif /* __xchg_u16 */ |
106 | |
107 | case 4: |
108 | #ifdef __xchg_u32 |
109 | return __xchg_u32(x, ptr); |
110 | #else |
111 | local_irq_save(flags); |
112 | ret = *(volatile u32 *)ptr; |
113 | *(volatile u32 *)ptr = x; |
114 | local_irq_restore(flags); |
115 | return ret; |
116 | #endif /* __xchg_u32 */ |
117 | |
118 | #ifdef CONFIG_64BIT |
119 | case 8: |
120 | #ifdef __xchg_u64 |
121 | return __xchg_u64(x, ptr); |
122 | #else |
123 | local_irq_save(flags); |
124 | ret = *(volatile u64 *)ptr; |
125 | *(volatile u64 *)ptr = x; |
126 | local_irq_restore(flags); |
127 | return ret; |
128 | #endif /* __xchg_u64 */ |
129 | #endif /* CONFIG_64BIT */ |
130 | |
131 | default: |
132 | __xchg_called_with_bad_pointer(); |
133 | return x; |
134 | } |
135 | } |
136 | |
137 | #define xchg(ptr, x) \ |
138 | ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr)))) |
139 | |
140 | #endif /* !__ASSEMBLY__ */ |
141 | |
142 | #endif /* __KERNEL__ */ |
143 | #endif /* __ASM_GENERIC_SYSTEM_H */ |
144 |
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v2.6.34-rc5
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