#ifndef __ASM_SH64_SYSTEM_H
#define __ASM_SH64_SYSTEM_H
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* include/asm-sh64/system.h
*
* Copyright (C) 2000, 2001 Paolo Alberelli
* Copyright (C) 2003 Paul Mundt
* Copyright (C) 2004 Richard Curnow
*
*/
#include <asm/registers.h>
#include <asm/processor.h>
/*
* switch_to() should switch tasks to task nr n, first
*/
typedef struct {
unsigned long seg;
} mm_segment_t;
extern struct task_struct *sh64_switch_to(struct task_struct *prev,
struct thread_struct *prev_thread,
struct task_struct *next,
struct thread_struct *next_thread);
#define switch_to(prev,next,last) \
do {\
if (last_task_used_math != next) {\
struct pt_regs *regs = next->thread.uregs;\
if (regs) regs->sr |= SR_FD;\
}\
last = sh64_switch_to(prev, &prev->thread, next, &next->thread);\
} while(0)
#define nop() __asm__ __volatile__ ("nop")
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
extern void __xchg_called_with_bad_pointer(void);
#define mb() __asm__ __volatile__ ("synco": : :"memory")
#define rmb() mb()
#define wmb() __asm__ __volatile__ ("synco": : :"memory")
#define read_barrier_depends() do { } while (0)
#ifdef CONFIG_SMP
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#define smp_read_barrier_depends() read_barrier_depends()
#else
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#define smp_read_barrier_depends() do { } while (0)
#endif /* CONFIG_SMP */
#define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
/* Interrupt Control */
#ifndef HARD_CLI
#define SR_MASK_L 0x000000f0L
#define SR_MASK_LL 0x00000000000000f0LL
#else
#define SR_MASK_L 0x10000000L
#define SR_MASK_LL 0x0000000010000000LL
#endif
static __inline__ void local_irq_enable(void)
{
/* cli/sti based on SR.BL */
unsigned long long __dummy0, __dummy1=~SR_MASK_LL;
__asm__ __volatile__("getcon " __SR ", %0\n\t"
"and %0, %1, %0\n\t"
"putcon %0, " __SR "\n\t"
: "=&r" (__dummy0)
: "r" (__dummy1));
}
static __inline__ void local_irq_disable(void)
{
/* cli/sti based on SR.BL */
unsigned long long __dummy0, __dummy1=SR_MASK_LL;
__asm__ __volatile__("getcon " __SR ", %0\n\t"
"or %0, %1, %0\n\t"
"putcon %0, " __SR "\n\t"
: "=&r" (__dummy0)
: "r" (__dummy1));
}
#define local_save_flags(x) \
(__extension__ ({ unsigned long long __dummy=SR_MASK_LL; \
__asm__ __volatile__( \
"getcon " __SR ", %0\n\t" \
"and %0, %1, %0" \
: "=&r" (x) \
: "r" (__dummy));}))
#define local_irq_save(x) \
(__extension__ ({ unsigned long long __d2=SR_MASK_LL, __d1; \
__asm__ __volatile__( \
"getcon " __SR ", %1\n\t" \
"or %1, r63, %0\n\t" \
"or %1, %2, %1\n\t" \
"putcon %1, " __SR "\n\t" \
"and %0, %2, %0" \
: "=&r" (x), "=&r" (__d1) \
: "r" (__d2));}));
#define local_irq_restore(x) do { \
if ( ((x) & SR_MASK_L) == 0 ) /* dropping to 0 ? */ \
local_irq_enable(); /* yes...re-enable */ \
} while (0)
#define irqs_disabled() \
({ \
unsigned long flags; \
local_save_flags(flags); \
(flags != 0); \
})
static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
{
unsigned long flags, retval;
local_irq_save(flags);
retval = *m;
*m = val;
local_irq_restore(flags);
return retval;
}
static inline unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
{
unsigned long flags, retval;
local_irq_save(flags);
retval = *m;
*m = val & 0xff;
local_irq_restore(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;
case 1:
return xchg_u8(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);
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#ifdef CONFIG_SH_ALPHANUMERIC
/* This is only used for debugging. */
extern void print_seg(char *file,int line);
#define PLS() print_seg(__FILE__,__LINE__)
#else /* CONFIG_SH_ALPHANUMERIC */
#define PLS()
#endif /* CONFIG_SH_ALPHANUMERIC */
#define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)
#define arch_align_stack(x) (x)
#endif /* __ASM_SH64_SYSTEM_H */
