summaryrefslogtreecommitdiff
path: root/ANDROID_3.4.5/arch/hexagon/include/asm/uaccess.h
diff options
context:
space:
mode:
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.h116
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