diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/hexagon/include/asm/uaccess.h')
-rw-r--r-- | ANDROID_3.4.5/arch/hexagon/include/asm/uaccess.h | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/ANDROID_3.4.5/arch/hexagon/include/asm/uaccess.h b/ANDROID_3.4.5/arch/hexagon/include/asm/uaccess.h deleted file mode 100644 index 7e706ead..00000000 --- a/ANDROID_3.4.5/arch/hexagon/include/asm/uaccess.h +++ /dev/null @@ -1,116 +0,0 @@ -/* - * User memory access support for Hexagon - * - * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 and - * only version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - */ - -#ifndef _ASM_UACCESS_H -#define _ASM_UACCESS_H -/* - * User space memory access functions - */ -#include <linux/sched.h> -#include <linux/mm.h> -#include <asm/segment.h> -#include <asm/sections.h> - -/* - * access_ok: - Checks if a user space pointer is valid - * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that - * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe - * to write to a block, it is always safe to read from it. - * @addr: User space pointer to start of block to check - * @size: Size of block to check - * - * Context: User context only. This function may sleep. - * - * 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. - * - * User address space in Hexagon, like x86, goes to 0xbfffffff, so the - * simple MSB-based tests used by MIPS won't work. Some further - * optimization is probably possible here, but for now, keep it - * reasonably simple and not *too* slow. After all, we've got the - * MMU for backup. - */ -#define VERIFY_READ 0 -#define VERIFY_WRITE 1 - -#define __access_ok(addr, size) \ - ((get_fs().seg == KERNEL_DS.seg) || \ - (((unsigned long)addr < get_fs().seg) && \ - (unsigned long)size < (get_fs().seg - (unsigned long)addr))) - -/* - * 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 __copy_from_user_hexagon(void *to, const void __user *from, - unsigned long n); -unsigned long __copy_to_user_hexagon(void __user *to, const void *from, - unsigned long n); - -#define __copy_from_user(to, from, n) __copy_from_user_hexagon(to, from, n) -#define __copy_to_user(to, from, n) __copy_to_user_hexagon(to, from, n) - -/* - * XXX todo: some additonal performance gain is possible by - * implementing __copy_to/from_user_inatomic, which is much - * like __copy_to/from_user, but performs slightly less checking. - */ - -__kernel_size_t __clear_user_hexagon(void __user *dest, unsigned long count); -#define __clear_user(a, s) __clear_user_hexagon((a), (s)) - -#define __strncpy_from_user(dst, src, n) hexagon_strncpy_from_user(dst, src, n) - -/* get around the ifndef in asm-generic/uaccess.h */ -#define __strnlen_user __strnlen_user - -extern long __strnlen_user(const char __user *src, long n); - -static inline long hexagon_strncpy_from_user(char *dst, const char __user *src, - long n); - -#include <asm-generic/uaccess.h> - -/* Todo: an actual accelerated version of this. */ -static inline long hexagon_strncpy_from_user(char *dst, const char __user *src, - long n) -{ - long res = __strnlen_user(src, n); - - /* return from strnlen can't be zero -- that would be rubbish. */ - - if (res > n) { - copy_from_user(dst, src, n); - return n; - } else { - copy_from_user(dst, src, res); - return res-1; - } -} - -#endif |