https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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- v2.6.20-rc4
- v2.6.20-rc3
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Tip revision: 8c2ffd9174779014c3fe1f96d9dc3641d9175f00 authored by Linus Torvalds on 24 March 2019, 21:02:26 UTC
Linux 5.1-rc2
Linux 5.1-rc2
Tip revision: 8c2ffd9
io.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _IO_H
#define _IO_H
#include "types.h"
/*
* Low-level I/O routines.
*
* Copied from <file:arch/powerpc/include/asm/io.h> (which has no copyright)
*/
static inline int in_8(const volatile unsigned char *addr)
{
int ret;
__asm__ __volatile__("lbz%U1%X1 %0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "m" (*addr));
return ret;
}
static inline void out_8(volatile unsigned char *addr, int val)
{
__asm__ __volatile__("stb%U0%X0 %1,%0; sync"
: "=m" (*addr) : "r" (val));
}
static inline unsigned in_le16(const volatile u16 *addr)
{
unsigned ret;
__asm__ __volatile__("lhbrx %0,0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "r" (addr), "m" (*addr));
return ret;
}
static inline unsigned in_be16(const volatile u16 *addr)
{
unsigned ret;
__asm__ __volatile__("lhz%U1%X1 %0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "m" (*addr));
return ret;
}
static inline void out_le16(volatile u16 *addr, int val)
{
__asm__ __volatile__("sthbrx %1,0,%2; sync" : "=m" (*addr)
: "r" (val), "r" (addr));
}
static inline void out_be16(volatile u16 *addr, int val)
{
__asm__ __volatile__("sth%U0%X0 %1,%0; sync"
: "=m" (*addr) : "r" (val));
}
static inline unsigned in_le32(const volatile unsigned *addr)
{
unsigned ret;
__asm__ __volatile__("lwbrx %0,0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "r" (addr), "m" (*addr));
return ret;
}
static inline unsigned in_be32(const volatile unsigned *addr)
{
unsigned ret;
__asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync"
: "=r" (ret) : "m" (*addr));
return ret;
}
static inline void out_le32(volatile unsigned *addr, int val)
{
__asm__ __volatile__("stwbrx %1,0,%2; sync" : "=m" (*addr)
: "r" (val), "r" (addr));
}
static inline void out_be32(volatile unsigned *addr, int val)
{
__asm__ __volatile__("stw%U0%X0 %1,%0; sync"
: "=m" (*addr) : "r" (val));
}
static inline void sync(void)
{
asm volatile("sync" : : : "memory");
}
static inline void eieio(void)
{
asm volatile("eieio" : : : "memory");
}
static inline void barrier(void)
{
asm volatile("" : : : "memory");
}
#endif /* _IO_H */