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