95e97463d2
This patch adds user_access() which can be used to gracefully handle
page faults that may happen when accessing user memory. It is used
by arch_cpu_user{memcpy, memset, strlcpy}() to allow using optimized
functions from the standard library.
Currently only x64 uses this, but nothing really is arch specific here.
Signed-off-by: Paweł Dziepak <pdziepak@quarnos.org>
58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
/*
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* Copyright 2014, Paweł Dziepak, pdziepak@quarnos.org.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _KERNEL_ARCH_USER_MEMORY_H
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#define _KERNEL_ARCH_USER_MEMORY_H
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#include <OS.h>
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#include <thread.h>
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#ifdef __x86_64__
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# include <arch/generic/user_memory.h>
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#else
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extern "C" {
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status_t _arch_cpu_user_memcpy(void* to, const void* from, size_t size,
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void (**faultHandler)(void));
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ssize_t _arch_cpu_user_strlcpy(char* to, const char* from, size_t size,
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void (**faultHandler)(void));
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status_t _arch_cpu_user_memset(void* s, char c, size_t count,
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void (**faultHandler)(void));
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}
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static inline status_t
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arch_cpu_user_memcpy(void* to, const void* from, size_t size)
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{
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return _arch_cpu_user_memcpy(to, from, size,
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&thread_get_current_thread()->fault_handler);
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}
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static inline ssize_t
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arch_cpu_user_strlcpy(char* to, const char* from, size_t size)
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{
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return _arch_cpu_user_strlcpy(to, from, size,
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&thread_get_current_thread()->fault_handler);
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}
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static inline status_t
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arch_cpu_user_memset(void* s, char c, size_t count)
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{
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return _arch_cpu_user_memset(s, c, count,
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&thread_get_current_thread()->fault_handler);
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}
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#endif
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#endif // _KERNEL_ARCH_USER_MEMORY_H
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