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