uaccess.h (762f99f4f3cb41a775b5157dd761217beba65873) uaccess.h (12700c17fc286149324f92d6d380bc48e43f253d)
1/*
2 * include/asm-xtensa/uaccess.h
3 *
4 * User space memory access functions
5 *
6 * These routines provide basic accessing functions to the user memory
7 * space for the kernel. This header file provides functions such as:
8 *

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30 */
31
32#define KERNEL_DS ((mm_segment_t) { 0 })
33#define USER_DS ((mm_segment_t) { 1 })
34
35#define get_fs() (current->thread.current_ds)
36#define set_fs(val) (current->thread.current_ds = (val))
37
1/*
2 * include/asm-xtensa/uaccess.h
3 *
4 * User space memory access functions
5 *
6 * These routines provide basic accessing functions to the user memory
7 * space for the kernel. This header file provides functions such as:
8 *

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30 */
31
32#define KERNEL_DS ((mm_segment_t) { 0 })
33#define USER_DS ((mm_segment_t) { 1 })
34
35#define get_fs() (current->thread.current_ds)
36#define set_fs(val) (current->thread.current_ds = (val))
37
38#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
38#include <asm-generic/access_ok.h>
39
39
40#define __kernel_ok (uaccess_kernel())
41#define __user_ok(addr, size) \
42 (((size) <= TASK_SIZE)&&((addr) <= TASK_SIZE-(size)))
43#define __access_ok(addr, size) (__kernel_ok || __user_ok((addr), (size)))
44#define access_ok(addr, size) __access_ok((unsigned long)(addr), (size))
45
46#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE)
47
48/*
49 * These are the main single-value transfer routines. They
50 * automatically use the right size if we just have the right pointer
51 * type.
52 *
53 * This gets kind of ugly. We want to return _two_ values in
54 * "get_user()" and yet we don't want to do any pointers, because that
55 * is too much of a performance impact. Thus we have a few rather ugly

--- 264 unchanged lines hidden --- 		40/*
41 * These are the main single-value transfer routines. They
42 * automatically use the right size if we just have the right pointer
43 * type.
44 *
45 * This gets kind of ugly. We want to return _two_ values in
46 * "get_user()" and yet we don't want to do any pointers, because that
47 * is too much of a performance impact. Thus we have a few rather ugly

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