108 строки
2.3 KiB
C
108 строки
2.3 KiB
C
/*
|
|
* Copyright (C) 2011 Texas Instruments Incorporated
|
|
* Author: Mark Salter <msalter@redhat.com>
|
|
*
|
|
* 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_C6X_UACCESS_H
|
|
#define _ASM_C6X_UACCESS_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/string.h>
|
|
|
|
#ifdef CONFIG_ACCESS_CHECK
|
|
#define __access_ok _access_ok
|
|
#endif
|
|
|
|
/*
|
|
* __copy_from_user/copy_to_user are based on ones in asm-generic/uaccess.h
|
|
*
|
|
* C6X supports unaligned 32 and 64 bit loads and stores.
|
|
*/
|
|
static inline __must_check long __copy_from_user(void *to,
|
|
const void __user *from, unsigned long n)
|
|
{
|
|
u32 tmp32;
|
|
u64 tmp64;
|
|
|
|
if (__builtin_constant_p(n)) {
|
|
switch (n) {
|
|
case 1:
|
|
*(u8 *)to = *(u8 __force *)from;
|
|
return 0;
|
|
case 4:
|
|
asm volatile ("ldnw .d1t1 *%2,%0\n"
|
|
"nop 4\n"
|
|
"stnw .d1t1 %0,*%1\n"
|
|
: "=&a"(tmp32)
|
|
: "A"(to), "a"(from)
|
|
: "memory");
|
|
return 0;
|
|
case 8:
|
|
asm volatile ("ldndw .d1t1 *%2,%0\n"
|
|
"nop 4\n"
|
|
"stndw .d1t1 %0,*%1\n"
|
|
: "=&a"(tmp64)
|
|
: "a"(to), "a"(from)
|
|
: "memory");
|
|
return 0;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
memcpy(to, (const void __force *)from, n);
|
|
return 0;
|
|
}
|
|
|
|
static inline __must_check long __copy_to_user(void __user *to,
|
|
const void *from, unsigned long n)
|
|
{
|
|
u32 tmp32;
|
|
u64 tmp64;
|
|
|
|
if (__builtin_constant_p(n)) {
|
|
switch (n) {
|
|
case 1:
|
|
*(u8 __force *)to = *(u8 *)from;
|
|
return 0;
|
|
case 4:
|
|
asm volatile ("ldnw .d1t1 *%2,%0\n"
|
|
"nop 4\n"
|
|
"stnw .d1t1 %0,*%1\n"
|
|
: "=&a"(tmp32)
|
|
: "a"(to), "a"(from)
|
|
: "memory");
|
|
return 0;
|
|
case 8:
|
|
asm volatile ("ldndw .d1t1 *%2,%0\n"
|
|
"nop 4\n"
|
|
"stndw .d1t1 %0,*%1\n"
|
|
: "=&a"(tmp64)
|
|
: "a"(to), "a"(from)
|
|
: "memory");
|
|
return 0;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
memcpy((void __force *)to, from, n);
|
|
return 0;
|
|
}
|
|
|
|
#define __copy_to_user __copy_to_user
|
|
#define __copy_from_user __copy_from_user
|
|
|
|
extern int _access_ok(unsigned long addr, unsigned long size);
|
|
#ifdef CONFIG_ACCESS_CHECK
|
|
#define __access_ok _access_ok
|
|
#endif
|
|
|
|
#include <asm-generic/uaccess.h>
|
|
|
|
#endif /* _ASM_C6X_UACCESS_H */
|