156 строки
4.1 KiB
C
156 строки
4.1 KiB
C
/*
|
|
* Copyright (C) 2004-2006 Atmel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef __ASM_AVR32_SYSTEM_H
|
|
#define __ASM_AVR32_SYSTEM_H
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <asm/sysreg.h>
|
|
|
|
#define xchg(ptr,x) \
|
|
((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
|
|
|
|
#define nop() asm volatile("nop")
|
|
|
|
#define mb() asm volatile("" : : : "memory")
|
|
#define rmb() mb()
|
|
#define wmb() asm volatile("sync 0" : : : "memory")
|
|
#define read_barrier_depends() do { } while(0)
|
|
#define set_mb(var, value) do { var = value; mb(); } while(0)
|
|
|
|
/*
|
|
* Help PathFinder and other Nexus-compliant debuggers keep track of
|
|
* the current PID by emitting an Ownership Trace Message each time we
|
|
* switch task.
|
|
*/
|
|
#ifdef CONFIG_OWNERSHIP_TRACE
|
|
#include <asm/ocd.h>
|
|
#define finish_arch_switch(prev) \
|
|
do { \
|
|
__mtdr(DBGREG_PID, prev->pid); \
|
|
__mtdr(DBGREG_PID, current->pid); \
|
|
} while(0)
|
|
#endif
|
|
|
|
/*
|
|
* switch_to(prev, next, last) should switch from task `prev' to task
|
|
* `next'. `prev' will never be the same as `next'.
|
|
*
|
|
* We just delegate everything to the __switch_to assembly function,
|
|
* which is implemented in arch/avr32/kernel/switch_to.S
|
|
*
|
|
* mb() tells GCC not to cache `current' across this call.
|
|
*/
|
|
struct cpu_context;
|
|
struct task_struct;
|
|
extern struct task_struct *__switch_to(struct task_struct *,
|
|
struct cpu_context *,
|
|
struct cpu_context *);
|
|
#define switch_to(prev, next, last) \
|
|
do { \
|
|
last = __switch_to(prev, &prev->thread.cpu_context + 1, \
|
|
&next->thread.cpu_context); \
|
|
} while (0)
|
|
|
|
#ifdef CONFIG_SMP
|
|
# error "The AVR32 port does not support SMP"
|
|
#else
|
|
# define smp_mb() barrier()
|
|
# define smp_rmb() barrier()
|
|
# define smp_wmb() barrier()
|
|
# define smp_read_barrier_depends() do { } while(0)
|
|
#endif
|
|
|
|
#include <linux/irqflags.h>
|
|
|
|
extern void __xchg_called_with_bad_pointer(void);
|
|
|
|
#ifdef __CHECKER__
|
|
extern unsigned long __builtin_xchg(void *ptr, unsigned long x);
|
|
#endif
|
|
|
|
#define xchg_u32(val, m) __builtin_xchg((void *)m, val)
|
|
|
|
static inline unsigned long __xchg(unsigned long x,
|
|
volatile void *ptr,
|
|
int size)
|
|
{
|
|
switch(size) {
|
|
case 4:
|
|
return xchg_u32(x, ptr);
|
|
default:
|
|
__xchg_called_with_bad_pointer();
|
|
return x;
|
|
}
|
|
}
|
|
|
|
static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
|
|
unsigned long new)
|
|
{
|
|
__u32 ret;
|
|
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %[ret], %[m]\n"
|
|
" cp.w %[ret], %[old]\n"
|
|
" brne 2f\n"
|
|
" stcond %[m], %[new]\n"
|
|
" brne 1b\n"
|
|
"2:\n"
|
|
: [ret] "=&r"(ret), [m] "=m"(*m)
|
|
: "m"(m), [old] "ir"(old), [new] "r"(new)
|
|
: "memory", "cc");
|
|
return ret;
|
|
}
|
|
|
|
extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
|
|
volatile int * m, unsigned long old, unsigned long new);
|
|
#define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels
|
|
|
|
/* 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);
|
|
case 8:
|
|
return __cmpxchg_u64(ptr, old, new);
|
|
}
|
|
|
|
__cmpxchg_called_with_bad_pointer();
|
|
return old;
|
|
}
|
|
|
|
#define cmpxchg(ptr, old, new) \
|
|
((typeof(*(ptr)))__cmpxchg((ptr), (unsigned long)(old), \
|
|
(unsigned long)(new), \
|
|
sizeof(*(ptr))))
|
|
|
|
struct pt_regs;
|
|
extern void __die(const char *, struct pt_regs *, unsigned long,
|
|
const char *, const char *, unsigned long);
|
|
extern void __die_if_kernel(const char *, struct pt_regs *, unsigned long,
|
|
const char *, const char *, unsigned long);
|
|
|
|
#define die(msg, regs, err) \
|
|
__die(msg, regs, err, __FILE__ ":", __FUNCTION__, __LINE__)
|
|
#define die_if_kernel(msg, regs, err) \
|
|
__die_if_kernel(msg, regs, err, __FILE__ ":", __FUNCTION__, __LINE__)
|
|
|
|
#define arch_align_stack(x) (x)
|
|
|
|
#endif /* __ASM_AVR32_SYSTEM_H */
|