64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* User memory access support for Hexagon
|
|
*
|
|
* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
|
|
*/
|
|
|
|
#ifndef _ASM_UACCESS_H
|
|
#define _ASM_UACCESS_H
|
|
/*
|
|
* User space memory access functions
|
|
*/
|
|
#include <asm/sections.h>
|
|
|
|
/*
|
|
* access_ok: - Checks if a user space pointer is valid
|
|
* @addr: User space pointer to start of block to check
|
|
* @size: Size of block to check
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* Checks if a pointer to a block of memory in user space is valid.
|
|
*
|
|
* Returns true (nonzero) if the memory block *may* be valid, false (zero)
|
|
* if it is definitely invalid.
|
|
*
|
|
*/
|
|
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
|
|
#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE)
|
|
|
|
static inline int __access_ok(unsigned long addr, unsigned long size)
|
|
{
|
|
unsigned long limit = TASK_SIZE;
|
|
|
|
return (size <= limit) && (addr <= (limit - size));
|
|
}
|
|
#define __access_ok __access_ok
|
|
|
|
/*
|
|
* When a kernel-mode page fault is taken, the faulting instruction
|
|
* address is checked against a table of exception_table_entries.
|
|
* Each entry is a tuple of the address of an instruction that may
|
|
* be authorized to fault, and the address at which execution should
|
|
* be resumed instead of the faulting instruction, so as to effect
|
|
* a workaround.
|
|
*/
|
|
|
|
/* Assembly somewhat optimized copy routines */
|
|
unsigned long raw_copy_from_user(void *to, const void __user *from,
|
|
unsigned long n);
|
|
unsigned long raw_copy_to_user(void __user *to, const void *from,
|
|
unsigned long n);
|
|
#define INLINE_COPY_FROM_USER
|
|
#define INLINE_COPY_TO_USER
|
|
|
|
__kernel_size_t __clear_user_hexagon(void __user *dest, unsigned long count);
|
|
#define __clear_user(a, s) __clear_user_hexagon((a), (s))
|
|
|
|
#include <asm-generic/uaccess.h>
|
|
|
|
|
|
#endif
|