modules: warn about suspicious return values from module's ->init() hook
[linux-2.6] / include / asm-sh / system.h
1 #ifndef __ASM_SH_SYSTEM_H
2 #define __ASM_SH_SYSTEM_H
3
4 /*
5  * Copyright (C) 1999, 2000  Niibe Yutaka  &  Kaz Kojima
6  * Copyright (C) 2002 Paul Mundt
7  */
8
9 #include <linux/irqflags.h>
10 #include <linux/compiler.h>
11 #include <linux/linkage.h>
12 #include <asm/types.h>
13 #include <asm/ptrace.h>
14
15 #define AT_VECTOR_SIZE_ARCH 5 /* entries in ARCH_DLINFO */
16
17 #if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
18 #define __icbi()                        \
19 {                                       \
20         unsigned long __addr;           \
21         __addr = 0xa8000000;            \
22         __asm__ __volatile__(           \
23                 "icbi   %0\n\t"         \
24                 : /* no output */       \
25                 : "m" (__m(__addr)));   \
26 }
27 #endif
28
29 /*
30  * A brief note on ctrl_barrier(), the control register write barrier.
31  *
32  * Legacy SH cores typically require a sequence of 8 nops after
33  * modification of a control register in order for the changes to take
34  * effect. On newer cores (like the sh4a and sh5) this is accomplished
35  * with icbi.
36  *
37  * Also note that on sh4a in the icbi case we can forego a synco for the
38  * write barrier, as it's not necessary for control registers.
39  *
40  * Historically we have only done this type of barrier for the MMUCR, but
41  * it's also necessary for the CCR, so we make it generic here instead.
42  */
43 #if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
44 #define mb()            __asm__ __volatile__ ("synco": : :"memory")
45 #define rmb()           mb()
46 #define wmb()           __asm__ __volatile__ ("synco": : :"memory")
47 #define ctrl_barrier()  __icbi()
48 #define read_barrier_depends()  do { } while(0)
49 #else
50 #define mb()            __asm__ __volatile__ ("": : :"memory")
51 #define rmb()           mb()
52 #define wmb()           __asm__ __volatile__ ("": : :"memory")
53 #define ctrl_barrier()  __asm__ __volatile__ ("nop;nop;nop;nop;nop;nop;nop;nop")
54 #define read_barrier_depends()  do { } while(0)
55 #endif
56
57 #ifdef CONFIG_SMP
58 #define smp_mb()        mb()
59 #define smp_rmb()       rmb()
60 #define smp_wmb()       wmb()
61 #define smp_read_barrier_depends()      read_barrier_depends()
62 #else
63 #define smp_mb()        barrier()
64 #define smp_rmb()       barrier()
65 #define smp_wmb()       barrier()
66 #define smp_read_barrier_depends()      do { } while(0)
67 #endif
68
69 #define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
70
71 #ifdef CONFIG_GUSA_RB
72 #include <asm/cmpxchg-grb.h>
73 #else
74 #include <asm/cmpxchg-irq.h>
75 #endif
76
77 extern void __xchg_called_with_bad_pointer(void);
78
79 #define __xchg(ptr, x, size)                            \
80 ({                                                      \
81         unsigned long __xchg__res;                      \
82         volatile void *__xchg_ptr = (ptr);              \
83         switch (size) {                                 \
84         case 4:                                         \
85                 __xchg__res = xchg_u32(__xchg_ptr, x);  \
86                 break;                                  \
87         case 1:                                         \
88                 __xchg__res = xchg_u8(__xchg_ptr, x);   \
89                 break;                                  \
90         default:                                        \
91                 __xchg_called_with_bad_pointer();       \
92                 __xchg__res = x;                        \
93                 break;                                  \
94         }                                               \
95                                                         \
96         __xchg__res;                                    \
97 })
98
99 #define xchg(ptr,x)     \
100         ((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
101
102 /* This function doesn't exist, so you'll get a linker error
103  * if something tries to do an invalid cmpxchg(). */
104 extern void __cmpxchg_called_with_bad_pointer(void);
105
106 #define __HAVE_ARCH_CMPXCHG 1
107
108 static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
109                 unsigned long new, int size)
110 {
111         switch (size) {
112         case 4:
113                 return __cmpxchg_u32(ptr, old, new);
114         }
115         __cmpxchg_called_with_bad_pointer();
116         return old;
117 }
118
119 #define cmpxchg(ptr,o,n)                                                 \
120   ({                                                                     \
121      __typeof__(*(ptr)) _o_ = (o);                                       \
122      __typeof__(*(ptr)) _n_ = (n);                                       \
123      (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,           \
124                                     (unsigned long)_n_, sizeof(*(ptr))); \
125   })
126
127 extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
128
129 extern void *set_exception_table_vec(unsigned int vec, void *handler);
130
131 static inline void *set_exception_table_evt(unsigned int evt, void *handler)
132 {
133         return set_exception_table_vec(evt >> 5, handler);
134 }
135
136 /*
137  * SH-2A has both 16 and 32-bit opcodes, do lame encoding checks.
138  */
139 #ifdef CONFIG_CPU_SH2A
140 extern unsigned int instruction_size(unsigned int insn);
141 #elif defined(CONFIG_SUPERH32)
142 #define instruction_size(insn)  (2)
143 #else
144 #define instruction_size(insn)  (4)
145 #endif
146
147 extern unsigned long cached_to_uncached;
148
149 /* XXX
150  * disable hlt during certain critical i/o operations
151  */
152 #define HAVE_DISABLE_HLT
153 void disable_hlt(void);
154 void enable_hlt(void);
155
156 void default_idle(void);
157 void per_cpu_trap_init(void);
158
159 asmlinkage void break_point_trap(void);
160
161 #ifdef CONFIG_SUPERH32
162 #define BUILD_TRAP_HANDLER(name)                                        \
163 asmlinkage void name##_trap_handler(unsigned long r4, unsigned long r5, \
164                                     unsigned long r6, unsigned long r7, \
165                                     struct pt_regs __regs)
166
167 #define TRAP_HANDLER_DECL                               \
168         struct pt_regs *regs = RELOC_HIDE(&__regs, 0);  \
169         unsigned int vec = regs->tra;                   \
170         (void)vec;
171 #else
172 #define BUILD_TRAP_HANDLER(name)        \
173 asmlinkage void name##_trap_handler(unsigned int vec, struct pt_regs *regs)
174 #define TRAP_HANDLER_DECL
175 #endif
176
177 BUILD_TRAP_HANDLER(address_error);
178 BUILD_TRAP_HANDLER(debug);
179 BUILD_TRAP_HANDLER(bug);
180 BUILD_TRAP_HANDLER(fpu_error);
181 BUILD_TRAP_HANDLER(fpu_state_restore);
182
183 #define arch_align_stack(x) (x)
184
185 struct mem_access {
186         unsigned long (*from)(void *dst, const void *src, unsigned long cnt);
187         unsigned long (*to)(void *dst, const void *src, unsigned long cnt);
188 };
189
190 #ifdef CONFIG_SUPERH32
191 # include "system_32.h"
192 #else
193 # include "system_64.h"
194 #endif
195
196 #endif