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- /*
- * Copyright (C) 2011 Texas Instruments Incorporated
- * Author: Mark Salter <msalter@redhat.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #ifndef _ASM_C6X_UACCESS_H
- #define _ASM_C6X_UACCESS_H
- #include <linux/types.h>
- #include <linux/compiler.h>
- #include <linux/string.h>
- #ifdef CONFIG_ACCESS_CHECK
- #define __access_ok _access_ok
- #endif
- /*
- * __copy_from_user/copy_to_user are based on ones in asm-generic/uaccess.h
- *
- * C6X supports unaligned 32 and 64 bit loads and stores.
- */
- static inline __must_check long __copy_from_user(void *to,
- const void __user *from, unsigned long n)
- {
- u32 tmp32;
- u64 tmp64;
- if (__builtin_constant_p(n)) {
- switch (n) {
- case 1:
- *(u8 *)to = *(u8 __force *)from;
- return 0;
- case 4:
- asm volatile ("ldnw .d1t1 *%2,%0\n"
- "nop 4\n"
- "stnw .d1t1 %0,*%1\n"
- : "=&a"(tmp32)
- : "A"(to), "a"(from)
- : "memory");
- return 0;
- case 8:
- asm volatile ("ldndw .d1t1 *%2,%0\n"
- "nop 4\n"
- "stndw .d1t1 %0,*%1\n"
- : "=&a"(tmp64)
- : "a"(to), "a"(from)
- : "memory");
- return 0;
- default:
- break;
- }
- }
- memcpy(to, (const void __force *)from, n);
- return 0;
- }
- static inline __must_check long __copy_to_user(void __user *to,
- const void *from, unsigned long n)
- {
- u32 tmp32;
- u64 tmp64;
- if (__builtin_constant_p(n)) {
- switch (n) {
- case 1:
- *(u8 __force *)to = *(u8 *)from;
- return 0;
- case 4:
- asm volatile ("ldnw .d1t1 *%2,%0\n"
- "nop 4\n"
- "stnw .d1t1 %0,*%1\n"
- : "=&a"(tmp32)
- : "a"(to), "a"(from)
- : "memory");
- return 0;
- case 8:
- asm volatile ("ldndw .d1t1 *%2,%0\n"
- "nop 4\n"
- "stndw .d1t1 %0,*%1\n"
- : "=&a"(tmp64)
- : "a"(to), "a"(from)
- : "memory");
- return 0;
- default:
- break;
- }
- }
- memcpy((void __force *)to, from, n);
- return 0;
- }
- #define __copy_to_user __copy_to_user
- #define __copy_from_user __copy_from_user
- extern int _access_ok(unsigned long addr, unsigned long size);
- #ifdef CONFIG_ACCESS_CHECK
- #define __access_ok _access_ok
- #endif
- #include <asm-generic/uaccess.h>
- #endif /* _ASM_C6X_UACCESS_H */
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