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https://github.com/SerenityOS/serenity
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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/UserOrKernelBuffer.h>
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namespace Kernel {
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bool UserOrKernelBuffer::is_kernel_buffer() const
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{
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return !Memory::is_user_address(VirtualAddress(m_buffer));
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}
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ErrorOr<NonnullOwnPtr<KString>> UserOrKernelBuffer::try_copy_into_kstring(size_t size) const
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{
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if (!m_buffer)
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return EINVAL;
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if (Memory::is_user_address(VirtualAddress(m_buffer))) {
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char* buffer;
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auto kstring = TRY(KString::try_create_uninitialized(size, buffer));
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TRY(copy_from_user(buffer, m_buffer, size));
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return kstring;
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}
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return KString::try_create(ReadonlyBytes { m_buffer, size });
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}
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ErrorOr<void> UserOrKernelBuffer::write(void const* src, size_t offset, size_t len)
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{
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if (!m_buffer)
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return EFAULT;
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if (Memory::is_user_address(VirtualAddress(m_buffer)))
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return copy_to_user(m_buffer + offset, src, len);
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memcpy(m_buffer + offset, src, len);
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return {};
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}
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ErrorOr<void> UserOrKernelBuffer::read(void* dest, size_t offset, size_t len) const
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{
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if (!m_buffer)
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return EFAULT;
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if (Memory::is_user_address(VirtualAddress(m_buffer)))
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return copy_from_user(dest, m_buffer + offset, len);
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memcpy(dest, m_buffer + offset, len);
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return {};
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}
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ErrorOr<void> UserOrKernelBuffer::memset(int value, size_t offset, size_t len)
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{
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if (!m_buffer)
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return EFAULT;
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if (Memory::is_user_address(VirtualAddress(m_buffer)))
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return memset_user(m_buffer + offset, value, len);
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::memset(m_buffer + offset, value, len);
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return {};
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}
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}
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