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5f97f7f9 HS |
1 | /* |
2 | * Copyright (C) 2004-2006 Atmel Corporation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | #ifndef __ASM_AVR32_SYSTEM_H | |
9 | #define __ASM_AVR32_SYSTEM_H | |
10 | ||
11 | #include <linux/compiler.h> | |
623b0355 | 12 | #include <linux/linkage.h> |
5f97f7f9 HS |
13 | #include <linux/types.h> |
14 | ||
15 | #include <asm/ptrace.h> | |
16 | #include <asm/sysreg.h> | |
17 | ||
18 | #define xchg(ptr,x) \ | |
19 | ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) | |
20 | ||
21 | #define nop() asm volatile("nop") | |
22 | ||
23 | #define mb() asm volatile("" : : : "memory") | |
24 | #define rmb() mb() | |
25 | #define wmb() asm volatile("sync 0" : : : "memory") | |
26 | #define read_barrier_depends() do { } while(0) | |
27 | #define set_mb(var, value) do { var = value; mb(); } while(0) | |
28 | ||
29 | /* | |
30 | * Help PathFinder and other Nexus-compliant debuggers keep track of | |
31 | * the current PID by emitting an Ownership Trace Message each time we | |
32 | * switch task. | |
33 | */ | |
34 | #ifdef CONFIG_OWNERSHIP_TRACE | |
35 | #include <asm/ocd.h> | |
36 | #define finish_arch_switch(prev) \ | |
37 | do { \ | |
8dfe8f29 HS |
38 | ocd_write(PID, prev->pid); \ |
39 | ocd_write(PID, current->pid); \ | |
5f97f7f9 HS |
40 | } while(0) |
41 | #endif | |
42 | ||
43 | /* | |
44 | * switch_to(prev, next, last) should switch from task `prev' to task | |
45 | * `next'. `prev' will never be the same as `next'. | |
46 | * | |
47 | * We just delegate everything to the __switch_to assembly function, | |
48 | * which is implemented in arch/avr32/kernel/switch_to.S | |
49 | * | |
50 | * mb() tells GCC not to cache `current' across this call. | |
51 | */ | |
52 | struct cpu_context; | |
53 | struct task_struct; | |
54 | extern struct task_struct *__switch_to(struct task_struct *, | |
55 | struct cpu_context *, | |
56 | struct cpu_context *); | |
57 | #define switch_to(prev, next, last) \ | |
58 | do { \ | |
59 | last = __switch_to(prev, &prev->thread.cpu_context + 1, \ | |
60 | &next->thread.cpu_context); \ | |
61 | } while (0) | |
62 | ||
63 | #ifdef CONFIG_SMP | |
64 | # error "The AVR32 port does not support SMP" | |
65 | #else | |
66 | # define smp_mb() barrier() | |
67 | # define smp_rmb() barrier() | |
68 | # define smp_wmb() barrier() | |
69 | # define smp_read_barrier_depends() do { } while(0) | |
70 | #endif | |
71 | ||
72 | #include <linux/irqflags.h> | |
73 | ||
74 | extern void __xchg_called_with_bad_pointer(void); | |
75 | ||
bb7aa6d4 HS |
76 | static inline unsigned long xchg_u32(u32 val, volatile u32 *m) |
77 | { | |
78 | u32 ret; | |
5f97f7f9 | 79 | |
bb7aa6d4 HS |
80 | asm volatile("xchg %[ret], %[m], %[val]" |
81 | : [ret] "=&r"(ret), "=m"(*m) | |
82 | : "m"(*m), [m] "r"(m), [val] "r"(val) | |
83 | : "memory"); | |
84 | return ret; | |
85 | } | |
5f97f7f9 HS |
86 | |
87 | static inline unsigned long __xchg(unsigned long x, | |
88 | volatile void *ptr, | |
89 | int size) | |
90 | { | |
91 | switch(size) { | |
92 | case 4: | |
93 | return xchg_u32(x, ptr); | |
94 | default: | |
95 | __xchg_called_with_bad_pointer(); | |
96 | return x; | |
97 | } | |
98 | } | |
99 | ||
100 | static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old, | |
101 | unsigned long new) | |
102 | { | |
103 | __u32 ret; | |
104 | ||
105 | asm volatile( | |
106 | "1: ssrf 5\n" | |
107 | " ld.w %[ret], %[m]\n" | |
108 | " cp.w %[ret], %[old]\n" | |
109 | " brne 2f\n" | |
110 | " stcond %[m], %[new]\n" | |
111 | " brne 1b\n" | |
112 | "2:\n" | |
113 | : [ret] "=&r"(ret), [m] "=m"(*m) | |
114 | : "m"(m), [old] "ir"(old), [new] "r"(new) | |
115 | : "memory", "cc"); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels( | |
120 | volatile int * m, unsigned long old, unsigned long new); | |
121 | #define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels | |
122 | ||
123 | /* This function doesn't exist, so you'll get a linker error | |
124 | if something tries to do an invalid cmpxchg(). */ | |
125 | extern void __cmpxchg_called_with_bad_pointer(void); | |
126 | ||
127 | #define __HAVE_ARCH_CMPXCHG 1 | |
128 | ||
129 | static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, | |
130 | unsigned long new, int size) | |
131 | { | |
132 | switch (size) { | |
133 | case 4: | |
134 | return __cmpxchg_u32(ptr, old, new); | |
135 | case 8: | |
136 | return __cmpxchg_u64(ptr, old, new); | |
137 | } | |
138 | ||
139 | __cmpxchg_called_with_bad_pointer(); | |
140 | return old; | |
141 | } | |
142 | ||
143 | #define cmpxchg(ptr, old, new) \ | |
144 | ((typeof(*(ptr)))__cmpxchg((ptr), (unsigned long)(old), \ | |
145 | (unsigned long)(new), \ | |
146 | sizeof(*(ptr)))) | |
147 | ||
5e86c11d MD |
148 | #include <asm-generic/cmpxchg-local.h> |
149 | ||
150 | static inline unsigned long __cmpxchg_local(volatile void *ptr, | |
151 | unsigned long old, | |
152 | unsigned long new, int size) | |
153 | { | |
154 | switch (size) { | |
155 | case 4: | |
156 | return __cmpxchg_u32(ptr, old, new); | |
157 | default: | |
158 | return __cmpxchg_local_generic(ptr, old, new, size); | |
159 | } | |
160 | ||
161 | return old; | |
162 | } | |
163 | ||
164 | #define cmpxchg_local(ptr, old, new) \ | |
165 | ((typeof(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(old), \ | |
166 | (unsigned long)(new), \ | |
167 | sizeof(*(ptr)))) | |
168 | ||
169 | #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) | |
170 | ||
5f97f7f9 | 171 | struct pt_regs; |
623b0355 HS |
172 | void NORET_TYPE die(const char *str, struct pt_regs *regs, long err); |
173 | void _exception(long signr, struct pt_regs *regs, int code, | |
174 | unsigned long addr); | |
5f97f7f9 HS |
175 | |
176 | #define arch_align_stack(x) (x) | |
177 | ||
178 | #endif /* __ASM_AVR32_SYSTEM_H */ |