1 #ifndef __ASM_SH_SYSTEM_H
2 #define __ASM_SH_SYSTEM_H
5 * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
6 * Copyright (C) 2002 Paul Mundt
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>
15 #define AT_VECTOR_SIZE_ARCH 5 /* entries in ARCH_DLINFO */
17 #if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
20 unsigned long __addr; \
21 __addr = 0xa8000000; \
22 __asm__ __volatile__( \
25 : "m" (__m(__addr))); \
30 * A brief note on ctrl_barrier(), the control register write barrier.
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
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.
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.
43 #if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
44 #define mb() __asm__ __volatile__ ("synco": : :"memory")
46 #define wmb() __asm__ __volatile__ ("synco": : :"memory")
47 #define ctrl_barrier() __icbi()
48 #define read_barrier_depends() do { } while(0)
50 #define mb() __asm__ __volatile__ ("": : :"memory")
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)
59 #define smp_rmb() rmb()
60 #define smp_wmb() wmb()
61 #define smp_read_barrier_depends() read_barrier_depends()
63 #define smp_mb() barrier()
64 #define smp_rmb() barrier()
65 #define smp_wmb() barrier()
66 #define smp_read_barrier_depends() do { } while(0)
69 #define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
72 #include <asm/cmpxchg-grb.h>
74 #include <asm/cmpxchg-irq.h>
77 extern void __xchg_called_with_bad_pointer(void);
79 #define __xchg(ptr, x, size) \
81 unsigned long __xchg__res; \
82 volatile void *__xchg_ptr = (ptr); \
85 __xchg__res = xchg_u32(__xchg_ptr, x); \
88 __xchg__res = xchg_u8(__xchg_ptr, x); \
91 __xchg_called_with_bad_pointer(); \
100 ((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
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);
106 #define __HAVE_ARCH_CMPXCHG 1
108 static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
109 unsigned long new, int size)
113 return __cmpxchg_u32(ptr, old, new);
115 __cmpxchg_called_with_bad_pointer();
119 #define cmpxchg(ptr,o,n) \
121 __typeof__(*(ptr)) _o_ = (o); \
122 __typeof__(*(ptr)) _n_ = (n); \
123 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
124 (unsigned long)_n_, sizeof(*(ptr))); \
127 extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
129 extern void *set_exception_table_vec(unsigned int vec, void *handler);
131 static inline void *set_exception_table_evt(unsigned int evt, void *handler)
133 return set_exception_table_vec(evt >> 5, handler);
137 * SH-2A has both 16 and 32-bit opcodes, do lame encoding checks.
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)
144 #define instruction_size(insn) (4)
147 extern unsigned long cached_to_uncached;
149 extern struct dentry *sh_debugfs_root;
152 * disable hlt during certain critical i/o operations
154 #define HAVE_DISABLE_HLT
155 void disable_hlt(void);
156 void enable_hlt(void);
158 void default_idle(void);
159 void per_cpu_trap_init(void);
161 asmlinkage void break_point_trap(void);
163 #ifdef CONFIG_SUPERH32
164 #define BUILD_TRAP_HANDLER(name) \
165 asmlinkage void name##_trap_handler(unsigned long r4, unsigned long r5, \
166 unsigned long r6, unsigned long r7, \
167 struct pt_regs __regs)
169 #define TRAP_HANDLER_DECL \
170 struct pt_regs *regs = RELOC_HIDE(&__regs, 0); \
171 unsigned int vec = regs->tra; \
174 #define BUILD_TRAP_HANDLER(name) \
175 asmlinkage void name##_trap_handler(unsigned int vec, struct pt_regs *regs)
176 #define TRAP_HANDLER_DECL
179 BUILD_TRAP_HANDLER(address_error);
180 BUILD_TRAP_HANDLER(debug);
181 BUILD_TRAP_HANDLER(bug);
182 BUILD_TRAP_HANDLER(fpu_error);
183 BUILD_TRAP_HANDLER(fpu_state_restore);
185 #define arch_align_stack(x) (x)
188 unsigned long (*from)(void *dst, const void *src, unsigned long cnt);
189 unsigned long (*to)(void *dst, const void *src, unsigned long cnt);
192 #ifdef CONFIG_SUPERH32
193 # include "system_32.h"
195 # include "system_64.h"