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7c0540a229
This has KString, KBuffer, DoubleBuffer, KBufferBuilder, IOWindow, UserOrKernelBuffer and ScopedCritical classes being moved to the Kernel/Library subdirectory. Also, move the panic and assertions handling code to that directory.
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/Library/UserOrKernelBuffer.h>
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#include <Kernel/Memory/MemoryManager.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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