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 struct task_struct
*__switch_to(struct task_struct
*prev
,
16 struct task_struct
*next
);
19 * switch_to() should switch tasks to task nr n, first
22 #define switch_to(prev, next, last) do { \
23 struct task_struct *__last; \
24 register unsigned long *__ts1 __asm__ ("r1") = &prev->thread.sp; \
25 register unsigned long *__ts2 __asm__ ("r2") = &prev->thread.pc; \
26 register unsigned long *__ts4 __asm__ ("r4") = (unsigned long *)prev; \
27 register unsigned long *__ts5 __asm__ ("r5") = (unsigned long *)next; \
28 register unsigned long *__ts6 __asm__ ("r6") = &next->thread.sp; \
29 register unsigned long __ts7 __asm__ ("r7") = next->thread.pc; \
30 __asm__ __volatile__ (".balign 4\n\t" \
31 "stc.l gbr, @-r15\n\t" \
32 "sts.l pr, @-r15\n\t" \
33 "mov.l r8, @-r15\n\t" \
34 "mov.l r9, @-r15\n\t" \
35 "mov.l r10, @-r15\n\t" \
36 "mov.l r11, @-r15\n\t" \
37 "mov.l r12, @-r15\n\t" \
38 "mov.l r13, @-r15\n\t" \
39 "mov.l r14, @-r15\n\t" \
40 "mov.l r15, @r1 ! save SP\n\t" \
41 "mov.l @r6, r15 ! change to new stack\n\t" \
43 "mov.l %0, @r2 ! save PC\n\t" \
45 "jmp @%0 ! call __switch_to\n\t" \
46 " lds r7, pr ! with return to new PC\n\t" \
49 ".long __switch_to\n" \
51 "mov.l @r15+, r14\n\t" \
52 "mov.l @r15+, r13\n\t" \
53 "mov.l @r15+, r12\n\t" \
54 "mov.l @r15+, r11\n\t" \
55 "mov.l @r15+, r10\n\t" \
56 "mov.l @r15+, r9\n\t" \
57 "mov.l @r15+, r8\n\t" \
58 "lds.l @r15+, pr\n\t" \
59 "ldc.l @r15+, gbr\n\t" \
61 : "r" (__ts1), "r" (__ts2), "r" (__ts4), \
62 "r" (__ts5), "r" (__ts6), "r" (__ts7) \
68 * On SMP systems, when the scheduler does migration-cost autodetection,
69 * it needs a way to flush as much of the CPU's caches as possible.
73 static inline void sched_cacheflush(void)
77 #ifdef CONFIG_CPU_SH4A
80 unsigned long __addr; \
81 __addr = 0xa8000000; \
82 __asm__ __volatile__( \
85 : "m" (__m(__addr))); \
90 * A brief note on ctrl_barrier(), the control register write barrier.
92 * Legacy SH cores typically require a sequence of 8 nops after
93 * modification of a control register in order for the changes to take
94 * effect. On newer cores (like the sh4a and sh5) this is accomplished
97 * Also note that on sh4a in the icbi case we can forego a synco for the
98 * write barrier, as it's not necessary for control registers.
100 * Historically we have only done this type of barrier for the MMUCR, but
101 * it's also necessary for the CCR, so we make it generic here instead.
103 #ifdef CONFIG_CPU_SH4A
104 #define mb() __asm__ __volatile__ ("synco": : :"memory")
106 #define wmb() __asm__ __volatile__ ("synco": : :"memory")
107 #define ctrl_barrier() __icbi()
108 #define read_barrier_depends() do { } while(0)
110 #define mb() __asm__ __volatile__ ("": : :"memory")
112 #define wmb() __asm__ __volatile__ ("": : :"memory")
113 #define ctrl_barrier() __asm__ __volatile__ ("nop;nop;nop;nop;nop;nop;nop;nop")
114 #define read_barrier_depends() do { } while(0)
118 #define smp_mb() mb()
119 #define smp_rmb() rmb()
120 #define smp_wmb() wmb()
121 #define smp_read_barrier_depends() read_barrier_depends()
123 #define smp_mb() barrier()
124 #define smp_rmb() barrier()
125 #define smp_wmb() barrier()
126 #define smp_read_barrier_depends() do { } while(0)
129 #define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
133 * When handling TLB or caches, we need to do it from P2 area.
135 #define jump_to_P2() \
137 unsigned long __dummy; \
138 __asm__ __volatile__( \
147 : "r" (0x20000000)); \
153 #define back_to_P1() \
155 unsigned long __dummy; \
157 __asm__ __volatile__( \
164 : "=&r" (__dummy)); \
167 static inline unsigned long xchg_u32(volatile u32
*m
, unsigned long val
)
169 unsigned long flags
, retval
;
171 local_irq_save(flags
);
174 local_irq_restore(flags
);
178 static inline unsigned long xchg_u8(volatile u8
*m
, unsigned long val
)
180 unsigned long flags
, retval
;
182 local_irq_save(flags
);
185 local_irq_restore(flags
);
189 extern void __xchg_called_with_bad_pointer(void);
191 #define __xchg(ptr, x, size) \
193 unsigned long __xchg__res; \
194 volatile void *__xchg_ptr = (ptr); \
197 __xchg__res = xchg_u32(__xchg_ptr, x); \
200 __xchg__res = xchg_u8(__xchg_ptr, x); \
203 __xchg_called_with_bad_pointer(); \
211 #define xchg(ptr,x) \
212 ((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
214 static inline unsigned long __cmpxchg_u32(volatile int * m
, unsigned long old
,
220 local_irq_save(flags
);
224 local_irq_restore(flags
); /* implies memory barrier */
228 /* This function doesn't exist, so you'll get a linker error
229 * if something tries to do an invalid cmpxchg(). */
230 extern void __cmpxchg_called_with_bad_pointer(void);
232 #define __HAVE_ARCH_CMPXCHG 1
234 static inline unsigned long __cmpxchg(volatile void * ptr
, unsigned long old
,
235 unsigned long new, int size
)
239 return __cmpxchg_u32(ptr
, old
, new);
241 __cmpxchg_called_with_bad_pointer();
245 #define cmpxchg(ptr,o,n) \
247 __typeof__(*(ptr)) _o_ = (o); \
248 __typeof__(*(ptr)) _n_ = (n); \
249 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
250 (unsigned long)_n_, sizeof(*(ptr))); \
253 extern void die(const char *str
, struct pt_regs
*regs
, long err
) __attribute__ ((noreturn
));
255 extern void *set_exception_table_vec(unsigned int vec
, void *handler
);
257 static inline void *set_exception_table_evt(unsigned int evt
, void *handler
)
259 return set_exception_table_vec(evt
>> 5, handler
);
263 * SH-2A has both 16 and 32-bit opcodes, do lame encoding checks.
265 #ifdef CONFIG_CPU_SH2A
266 extern unsigned int instruction_size(unsigned int insn
);
268 #define instruction_size(insn) (2)
272 * disable hlt during certain critical i/o operations
274 #define HAVE_DISABLE_HLT
275 void disable_hlt(void);
276 void enable_hlt(void);
278 void default_idle(void);
280 asmlinkage
void break_point_trap(void);
281 asmlinkage
void debug_trap_handler(unsigned long r4
, unsigned long r5
,
282 unsigned long r6
, unsigned long r7
,
283 struct pt_regs __regs
);
284 asmlinkage
void bug_trap_handler(unsigned long r4
, unsigned long r5
,
285 unsigned long r6
, unsigned long r7
,
286 struct pt_regs __regs
);
288 #define arch_align_stack(x) (x)