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/* $OpenBSD: uaccess.h,v 1.4 2020/11/17 11:20:59 jsg Exp $ */
/*
* Copyright (c) 2015 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _LINUX_UACCESS_H
#define _LINUX_UACCESS_H
#include <sys/types.h>
#include <sys/systm.h>
#include <linux/sched.h>
static inline unsigned long
__copy_to_user(void *to, const void *from, unsigned len)
{
if (copyout(from, to, len))
return len;
return 0;
}
static inline unsigned long
copy_to_user(void *to, const void *from, unsigned len)
{
return __copy_to_user(to, from, len);
}
static inline unsigned long
__copy_from_user(void *to, const void *from, unsigned len)
{
if (copyin(from, to, len))
return len;
return 0;
}
static inline unsigned long
copy_from_user(void *to, const void *from, unsigned len)
{
return __copy_from_user(to, from, len);
}
#define get_user(x, ptr) -copyin(ptr, &(x), sizeof(x))
#define put_user(x, ptr) ({ \
__typeof((x)) __tmp = (x); \
-copyout(&(__tmp), ptr, sizeof(__tmp)); \
})
#define __get_user(x, ptr) get_user((x), (ptr))
#define __put_user(x, ptr) put_user((x), (ptr))
#define unsafe_put_user(x, ptr, err) ({ \
__typeof((x)) __tmp = (x); \
if (copyout(&(__tmp), ptr, sizeof(__tmp)) != 0) \
goto err; \
})
static inline int
access_ok(const void *addr, unsigned long size)
{
return 1;
}
#define user_access_begin(addr, size) access_ok(addr, size)
#define user_access_end()
#if defined(__i386__) || defined(__amd64__)
static inline void
pagefault_disable(void)
{
curcpu()->ci_inatomic++;
KASSERT(curcpu()->ci_inatomic > 0);
}
static inline void
pagefault_enable(void)
{
KASSERT(curcpu()->ci_inatomic > 0);
curcpu()->ci_inatomic--;
}
static inline int
pagefault_disabled(void)
{
return curcpu()->ci_inatomic;
}
static inline unsigned long
__copy_to_user_inatomic(void *to, const void *from, unsigned len)
{
struct cpu_info *ci = curcpu();
int inatomic = ci->ci_inatomic;
int error;
ci->ci_inatomic = 1;
error = copyout(from, to, len);
ci->ci_inatomic = inatomic;
return (error ? len : 0);
}
static inline unsigned long
__copy_from_user_inatomic(void *to, const void *from, unsigned len)
{
struct cpu_info *ci = curcpu();
int inatomic = ci->ci_inatomic;
int error;
ci->ci_inatomic = 1;
error = copyin(from, to, len);
ci->ci_inatomic = inatomic;
return (error ? len : 0);
}
static inline unsigned long
__copy_from_user_inatomic_nocache(void *to, const void *from, unsigned len)
{
return __copy_from_user_inatomic(to, from, len);
}
#endif /* defined(__i386__) || defined(__amd64__) */
#endif
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