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97 lines
2.0 KiB
97 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2011 Texas Instruments Incorporated |
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* Author: Mark Salter <[email protected]> |
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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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/* |
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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 unsigned long |
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raw_copy_from_user(void *to, 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 unsigned long |
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raw_copy_to_user(void __user *to, 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 INLINE_COPY_FROM_USER |
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#define INLINE_COPY_TO_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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