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#ifndef __ASM_SH_SYSTEM_H
#define __ASM_SH_SYSTEM_H
/*
* Copyright (C) 1999 Niibe Yutaka
*/
/*
* switch_to() should switch tasks to task nr n, first
*/
typedef struct {
unsigned long seg;
} mm_segment_t;
#ifdef __SMP__
#error no SMP SuperH
#else
#define prepare_to_switch() do { } while(0)
#define switch_to(prev,next,last) do { \
register struct task_struct *__last; \
register unsigned long *__ts1 __asm__ ("r1") = &prev->thread.sp; \
register unsigned long *__ts2 __asm__ ("r2") = &prev->thread.pc; \
register unsigned long *__ts4 __asm__ ("r4") = (unsigned long *)prev; \
register unsigned long *__ts5 __asm__ ("r5") = (unsigned long *)next; \
register unsigned long *__ts6 __asm__ ("r6") = &next->thread.sp; \
register unsigned long __ts7 __asm__ ("r7") = next->thread.pc; \
__asm__ __volatile__ (".balign 4\n\t" \
"stc.l gbr,@-r15\n\t" \
"sts.l pr,@-r15\n\t" \
"mov.l r8,@-r15\n\t" \
"mov.l r9,@-r15\n\t" \
"mov.l r10,@-r15\n\t" \
"mov.l r11,@-r15\n\t" \
"mov.l r12,@-r15\n\t" \
"mov.l r13,@-r15\n\t" \
"mov.l r14,@-r15\n\t" \
"mov.l r15,@r1 ! save SP\n\t" \
"mov.l @r6,r15 ! change to new stack\n\t" \
"mov.l %0,@-r15 ! push R0 onto new stack\n\t" \
"mova 1f,%0\n\t" \
"mov.l %0,@r2 ! save PC\n\t" \
"mov.l 2f,%0\n\t" \
"jmp @%0 ! call __switch_to\n\t" \
" lds r7,pr ! with return to new PC\n\t" \
".balign 4\n" \
"2:\n\t" \
".long " "_" "__switch_to\n" \
"1:\n\t" \
"mov.l @r15+,%0 ! pop R0 from new stack\n\t" \
"mov.l @r15+,r14\n\t" \
"mov.l @r15+,r13\n\t" \
"mov.l @r15+,r12\n\t" \
"mov.l @r15+,r11\n\t" \
"mov.l @r15+,r10\n\t" \
"mov.l @r15+,r9\n\t" \
"mov.l @r15+,r8\n\t" \
"lds.l @r15+,pr\n\t" \
"ldc.l @r15+,gbr\n\t" \
:"=&z" (__last) \
:"0" (prev), \
"r" (__ts1), "r" (__ts2), \
"r" (__ts4), "r" (__ts5), "r" (__ts6), "r" (__ts7) \
:"r3"); \
last = __last; \
} while (0)
#endif
#define nop() __asm__ __volatile__ ("nop")
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
static __inline__ unsigned long tas(volatile int *m)
{ /* #define tas(ptr) (xchg((ptr),1)) */
unsigned long retval;
__asm__ __volatile__ ("tas.b @%1\n\t"
"movt %0"
: "=r" (retval): "r" (m): "t", "memory");
return retval;
}
extern void __xchg_called_with_bad_pointer(void);
#define mb() __asm__ __volatile__ ("": : :"memory")
#define rmb() mb()
#define wmb() __asm__ __volatile__ ("": : :"memory")
#define set_rmb(var, value) do { xchg(&var, value); } while (0)
#define set_mb(var, value) set_rmb(var, value)
#define set_wmb(var, value) do { var = value; wmb(); } while (0)
/* Interrupt Control */
extern __inline__ void __sti(void)
{
unsigned long __dummy;
__asm__ __volatile__("stc sr,%0\n\t"
"and %1,%0\n\t"
"ldc %0,sr"
: "=&r" (__dummy)
: "r" (0xefffffff)
: "memory");
}
extern __inline__ void __cli(void)
{
unsigned long __dummy;
__asm__ __volatile__("stc sr,%0\n\t"
"or %1,%0\n\t"
"ldc %0,sr"
: "=&r" (__dummy)
: "r" (0x10000000)
: "memory");
}
#define __save_flags(x) \
__asm__ __volatile__("stc sr,%0":"=r" (x): /* no inputs */ :"memory")
#define __save_and_cli(x) \
x = (__extension__ ({ unsigned long __dummy,__sr; \
__asm__ __volatile__( \
"stc sr,%1\n\t" \
"or %0,%1\n\t" \
"stc sr,%0\n\t" \
"ldc %1,sr" \
: "=r" (__sr), "=&r" (__dummy) \
: "0" (0x10000000) \
: "memory"); __sr; }))
#define __restore_flags(x) \
__asm__ __volatile__("ldc %0,sr": /* no output */: "r" (x):"memory")
/* For spinlocks etc */
#define local_irq_save(x) __save_and_cli(x)
#define local_irq_restore(x) __restore_flags(x)
#define local_irq_disable() __cli()
#define local_irq_enable() __sti()
#ifdef __SMP__
extern void __global_cli(void);
extern void __global_sti(void);
extern unsigned long __global_save_flags(void);
extern void __global_restore_flags(unsigned long);
#define cli() __global_cli()
#define sti() __global_sti()
#define save_flags(x) ((x)=__global_save_flags())
#define restore_flags(x) __global_restore_flags(x)
#else
#define cli() __cli()
#define sti() __sti()
#define save_flags(x) __save_flags(x)
#define save_and_cli(x) __save_and_cli(x)
#define restore_flags(x) __restore_flags(x)
#endif
extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
{
unsigned long flags, retval;
save_and_cli(flags);
retval = *m;
*m = val;
restore_flags(flags);
return retval;
}
static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
{
switch (size) {
case 4:
return xchg_u32(ptr, x);
break;
}
__xchg_called_with_bad_pointer();
return x;
}
/* XXX
* disable hlt during certain critical i/o operations
*/
#define HAVE_DISABLE_HLT
void disable_hlt(void);
void enable_hlt(void);
#endif
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