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-rw-r--r--include/asm-blackfin/uaccess.h205
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diff --git a/include/asm-blackfin/uaccess.h b/include/asm-blackfin/uaccess.h
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--- a/include/asm-blackfin/uaccess.h
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-/*
- * U-boot - uaccess.h
- *
- * Copyright (c) 2005-2007 Analog Devices Inc.
- *
- * This file is based on
- * Based on: include/asm-m68knommu/uaccess.h
- * Changes made by Lineo Inc. May 2001
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * 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 St, Fifth Floor, Boston,
- * MA 02110-1301 USA
- */
-
-#ifndef __BLACKFIN_UACCESS_H
-#define __BLACKFIN_UACCESS_H
-
-/*
- * User space memory access functions
- */
-#include <asm/segment.h>
-#include <asm/errno.h>
-
-#define VERIFY_READ 0
-#define VERIFY_WRITE 1
-
-/* We let the MMU do all checking */
-static inline int access_ok(int type, const void *addr, unsigned long size)
-{
- return ((unsigned long)addr < 0x10f00000); /* need final decision - Tony */
-}
-
-static inline int verify_area(int type, const void *addr, unsigned long size)
-{
- return access_ok(type, addr, size) ? 0 : -EFAULT;
-}
-
-/*
- * The exception table consists of pairs of addresses: the first is the
- * address of an instruction that is allowed to fault, and the second is
- * the address at which the program should continue. No registers are
- * modified, so it is entirely up to the continuation code to figure out
- * what to do.
- *
- * All the routines below use bits of fixup code that are out of line
- * with the main instruction path. This means when everything is well,
- * we don't even have to jump over them. Further, they do not intrude
- * on our cache or tlb entries.
- */
-
-struct exception_table_entry {
- unsigned long insn, fixup;
-};
-
-/* Returns 0 if exception not found and fixup otherwise. */
-extern unsigned long search_exception_table(unsigned long);
-
-/*
- * These are the main single-value transfer routines. They automatically
- * use the right size if we just have the right pointer type.
- */
-
-#define put_user(x, ptr) \
-({ \
- int __pu_err = 0; \
- typeof(*(ptr)) __pu_val = (x); \
- switch (sizeof (*(ptr))) { \
- case 1: \
- __put_user_asm(__pu_err, __pu_val, ptr, B); \
- break; \
- case 2: \
- __put_user_asm(__pu_err, __pu_val, ptr, W); \
- break; \
- case 4: \
- __put_user_asm(__pu_err, __pu_val, ptr, ); \
- break; \
- default: \
- __pu_err = __put_user_bad(); \
- break; \
- } \
- __pu_err; \
-})
-/*
- * [pregs] = dregs ==> 32bits
- * H[pregs] = dregs ==> 16bits
- * B[pregs] = dregs ==> 8 bits
- */
-
-#define __put_user(x, ptr) put_user(x, ptr)
-
-static inline int bad_user_access_length(void)
-{
- panic("bad_user_access_length");
- return -1;
-}
-
-#define __put_user_bad() (bad_user_access_length(), (-EFAULT))
-
-/*
- * Tell gcc we read from memory instead of writing: this is because
- * we do not write to any memory gcc knows about, so there are no
- * aliasing issues.
- */
-
-#define __ptr(x) ((unsigned long *)(x))
-
-#define __put_user_asm(err,x,ptr,bhw) \
- __asm__ (#bhw"[%1] = %0;\n\t" \
- : /* no outputs */ \
- :"d" (x),"a" (__ptr(ptr)) : "memory")
-
-#define get_user(x, ptr) \
-({ \
- int __gu_err = 0; \
- typeof(*(ptr)) __gu_val = 0; \
- switch (sizeof(*(ptr))) { \
- case 1: \
- __get_user_asm(__gu_err, __gu_val, ptr, B, "=d",(Z)); \
- break; \
- case 2: \
- __get_user_asm(__gu_err, __gu_val, ptr, W, "=r",(Z)); \
- break; \
- case 4: \
- __get_user_asm(__gu_err, __gu_val, ptr, , "=r",); \
- break; \
- default: \
- __gu_val = 0; \
- __gu_err = __get_user_bad(); \
- break; \
- } \
- (x) = __gu_val; \
- __gu_err; \
-})
-
-/* dregs = [pregs] ==> 32bits
- * H[pregs] ==> 16bits
- * B[pregs] ==> 8 bits
- */
-
-#define __get_user(x, ptr) get_user(x, ptr)
-#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
-
-#define __get_user_asm(err,x,ptr,bhw,reg,option) \
- __asm__ ("%0 =" #bhw "[%1]"#option";\n\t" \
- : "=d" (x) \
- : "a" (__ptr(ptr)))
-
-#define copy_from_user(to, from, n) (memcpy(to, from, n), 0)
-#define copy_to_user(to, from, n) (memcpy(to, from, n), 0)
-
-#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
-#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
-
-#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; })
-#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; })
-
-/*
- * Copy a null terminated string from userspace.
- */
-
-static inline long strncpy_from_user(char *dst, const char *src, long count)
-{
- char *tmp;
- strncpy(dst, src, count);
- for (tmp = dst; *tmp && count > 0; tmp++, count--) ;
- return (tmp - dst); /* DAVIDM should we count a NUL ? check getname */
-}
-
-/*
- * Return the size of a string (including the ending 0)
- *
- * Return 0 on exception, a value greater than N if too long
- */
-static inline long strnlen_user(const char *src, long n)
-{
- return (strlen(src) + 1); /* DAVIDM make safer */
-}
-
-#define strlen_user(str) strnlen_user(str, 32767)
-
-/*
- * Zero Userspace
- */
-
-static inline unsigned long clear_user(void *to, unsigned long n)
-{
- memset(to, 0, n);
- return (0);
-}
-
-#endif