mirror of
https://github.com/edk2-porting/linux-next.git
synced 2025-01-03 19:24:02 +08:00
885df91ca3
Create asm-generic/barrier.h and move the barrier definitions from asm-generic/system.h to it. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
/* Generic system definitions, based on MN10300 definitions.
|
|
*
|
|
* It should be possible to use these on really simple architectures,
|
|
* but it serves more as a starting point for new ports.
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#ifndef __ASM_GENERIC_SYSTEM_H
|
|
#define __ASM_GENERIC_SYSTEM_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/irqflags.h>
|
|
|
|
#include <asm/barrier.h>
|
|
#include <asm/cmpxchg.h>
|
|
|
|
struct task_struct;
|
|
|
|
/* context switching is now performed out-of-line in switch_to.S */
|
|
extern struct task_struct *__switch_to(struct task_struct *,
|
|
struct task_struct *);
|
|
#define switch_to(prev, next, last) \
|
|
do { \
|
|
((last) = __switch_to((prev), (next))); \
|
|
} while (0)
|
|
|
|
#define arch_align_stack(x) (x)
|
|
|
|
/*
|
|
* we make sure local_irq_enable() doesn't cause priority inversion
|
|
*/
|
|
|
|
/* This function doesn't exist, so you'll get a linker error
|
|
* if something tries to do an invalid xchg(). */
|
|
extern void __xchg_called_with_bad_pointer(void);
|
|
|
|
static inline
|
|
unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
|
|
{
|
|
unsigned long ret, flags;
|
|
|
|
switch (size) {
|
|
case 1:
|
|
#ifdef __xchg_u8
|
|
return __xchg_u8(x, ptr);
|
|
#else
|
|
local_irq_save(flags);
|
|
ret = *(volatile u8 *)ptr;
|
|
*(volatile u8 *)ptr = x;
|
|
local_irq_restore(flags);
|
|
return ret;
|
|
#endif /* __xchg_u8 */
|
|
|
|
case 2:
|
|
#ifdef __xchg_u16
|
|
return __xchg_u16(x, ptr);
|
|
#else
|
|
local_irq_save(flags);
|
|
ret = *(volatile u16 *)ptr;
|
|
*(volatile u16 *)ptr = x;
|
|
local_irq_restore(flags);
|
|
return ret;
|
|
#endif /* __xchg_u16 */
|
|
|
|
case 4:
|
|
#ifdef __xchg_u32
|
|
return __xchg_u32(x, ptr);
|
|
#else
|
|
local_irq_save(flags);
|
|
ret = *(volatile u32 *)ptr;
|
|
*(volatile u32 *)ptr = x;
|
|
local_irq_restore(flags);
|
|
return ret;
|
|
#endif /* __xchg_u32 */
|
|
|
|
#ifdef CONFIG_64BIT
|
|
case 8:
|
|
#ifdef __xchg_u64
|
|
return __xchg_u64(x, ptr);
|
|
#else
|
|
local_irq_save(flags);
|
|
ret = *(volatile u64 *)ptr;
|
|
*(volatile u64 *)ptr = x;
|
|
local_irq_restore(flags);
|
|
return ret;
|
|
#endif /* __xchg_u64 */
|
|
#endif /* CONFIG_64BIT */
|
|
|
|
default:
|
|
__xchg_called_with_bad_pointer();
|
|
return x;
|
|
}
|
|
}
|
|
|
|
#define xchg(ptr, x) \
|
|
((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* __ASM_GENERIC_SYSTEM_H */
|