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#ifndef __ASM_SH_SYSTEM_H
#define __ASM_SH_SYSTEM_H
/*
* Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
* Copyright (C) 2002 Paul Mundt
*/
#include <linux/irqflags.h>
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/types.h>
#include <asm/ptrace.h>
#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
#if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
#define __icbi() \
{ \
unsigned long __addr; \
__addr = 0xa8000000; \
__asm__ __volatile__( \
"icbi %0\n\t" \
: /* no output */ \
: "m" (__m(__addr))); \
}
#endif
/*
* A brief note on ctrl_barrier(), the control register write barrier.
*
* Legacy SH cores typically require a sequence of 8 nops after
* modification of a control register in order for the changes to take
* effect. On newer cores (like the sh4a and sh5) this is accomplished
* with icbi.
*
* Also note that on sh4a in the icbi case we can forego a synco for the
* write barrier, as it's not necessary for control registers.
*
* Historically we have only done this type of barrier for the MMUCR, but
* it's also necessary for the CCR, so we make it generic here instead.
*/
#if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
#define mb() __asm__ __volatile__ ("synco": : :"memory")
#define rmb() mb()
#define wmb() __asm__ __volatile__ ("synco": : :"memory")
#define ctrl_barrier() __icbi()
#define read_barrier_depends() do { } while(0)
#else
#define mb() __asm__ __volatile__ ("": : :"memory")
#define rmb() mb()
#define wmb() __asm__ __volatile__ ("": : :"memory")
#define ctrl_barrier() __asm__ __volatile__ ("nop;nop;nop;nop;nop;nop;nop;nop")
#define read_barrier_depends() do { } while(0)
#endif
#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
#define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
static inline unsigned long xchg_u32(volatile u32 *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 u8 *m, unsigned long val)
{
unsigned long flags, retval;
local_irq_save(flags);
retval = *m;
*m = val & 0xff;
local_irq_restore(flags);
return retval;
}
extern void __xchg_called_with_bad_pointer(void);
#define __xchg(ptr, x, size) \
({ \
unsigned long __xchg__res; \
volatile void *__xchg_ptr = (ptr); \
switch (size) { \
case 4: \
__xchg__res = xchg_u32(__xchg_ptr, x); \
break; \
case 1: \
__xchg__res = xchg_u8(__xchg_ptr, x); \
break; \
default: \
__xchg_called_with_bad_pointer(); \
__xchg__res = x; \
break; \
} \
\
__xchg__res; \
})
#define xchg(ptr,x) \
((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
unsigned long new)
{
__u32 retval;
unsigned long flags;
local_irq_save(flags);
retval = *m;
if (retval == old)
*m = new;
local_irq_restore(flags); /* implies memory barrier */
return retval;
}
/* This function doesn't exist, so you'll get a linker error
* if something tries to do an invalid cmpxchg(). */
extern void __cmpxchg_called_with_bad_pointer(void);
#define __HAVE_ARCH_CMPXCHG 1
static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
unsigned long new, int size)
{
switch (size) {
case 4:
return __cmpxchg_u32(ptr, old, new);
}
__cmpxchg_called_with_bad_pointer();
return old;
}
#define cmpxchg(ptr,o,n) \
({ \
__typeof__(*(ptr)) _o_ = (o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof(*(ptr))); \
})
extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
extern void *set_exception_table_vec(unsigned int vec, void *handler);
static inline void *set_exception_table_evt(unsigned int evt, void *handler)
{
return set_exception_table_vec(evt >> 5, handler);
}
/*
* SH-2A has both 16 and 32-bit opcodes, do lame encoding checks.
*/
#ifdef CONFIG_CPU_SH2A
extern unsigned int instruction_size(unsigned int insn);
#elif defined(CONFIG_SUPERH32)
#define instruction_size(insn) (2)
#else
#define instruction_size(insn) (4)
#endif
/* XXX
* disable hlt during certain critical i/o operations
*/
#define HAVE_DISABLE_HLT
void disable_hlt(void);
void enable_hlt(void);
void default_idle(void);
void per_cpu_trap_init(void);
asmlinkage void break_point_trap(void);
#ifdef CONFIG_SUPERH32
#define BUILD_TRAP_HANDLER(name) \
asmlinkage void name##_trap_handler(unsigned long r4, unsigned long r5, \
unsigned long r6, unsigned long r7, \
struct pt_regs __regs)
#define TRAP_HANDLER_DECL \
struct pt_regs *regs = RELOC_HIDE(&__regs, 0); \
unsigned int vec = regs->tra; \
(void)vec;
#else
#define BUILD_TRAP_HANDLER(name) \
asmlinkage void name##_trap_handler(unsigned int vec, struct pt_regs *regs)
#define TRAP_HANDLER_DECL
#endif
BUILD_TRAP_HANDLER(address_error);
BUILD_TRAP_HANDLER(debug);
BUILD_TRAP_HANDLER(bug);
#define arch_align_stack(x) (x)
#ifdef CONFIG_SUPERH32
# include "system_32.h"
#else
# include "system_64.h"
#endif
#endif
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