mirror of
https://github.com/RGBCube/serenity
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f6e82a8e0a
Instead of making it hold the shadow data as another `T`, make it hold the data as a byte array, and allow it to read the byte array as `T`. This makes it much easier to make a "read_typed" function in the MMU.
129 lines
3.2 KiB
C++
129 lines
3.2 KiB
C++
/*
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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 "SimpleRegion.h"
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#include <AK/ByteReader.h>
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#include <string.h>
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namespace UserspaceEmulator {
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SimpleRegion::SimpleRegion(u32 base, u32 size)
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: Region(base, size)
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{
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m_data = (u8*)calloc(1, size);
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m_shadow_data = (u8*)malloc(size);
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memset(m_shadow_data, 1, size);
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}
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SimpleRegion::~SimpleRegion()
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{
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free(m_shadow_data);
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free(m_data);
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}
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ValueWithShadow<u8> SimpleRegion::read8(FlatPtr offset)
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{
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VERIFY(offset < size());
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return { m_data[offset], m_shadow_data[offset] };
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}
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ValueWithShadow<u16> SimpleRegion::read16(u32 offset)
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{
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VERIFY(offset + 1 < size());
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u16 value, shadow;
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ByteReader::load<u16>(m_data + offset, value);
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ByteReader::load<u16>(m_shadow_data + offset, shadow);
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return { value, shadow };
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}
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ValueWithShadow<u32> SimpleRegion::read32(u32 offset)
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{
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VERIFY(offset + 3 < size());
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u32 value, shadow;
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ByteReader::load<u32>(m_data + offset, value);
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ByteReader::load<u32>(m_shadow_data + offset, shadow);
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return { value, shadow };
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}
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ValueWithShadow<u64> SimpleRegion::read64(u32 offset)
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{
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VERIFY(offset + 7 < size());
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u64 value, shadow;
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ByteReader::load<u64>(m_data + offset, value);
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ByteReader::load<u64>(m_shadow_data + offset, shadow);
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return { value, shadow };
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}
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ValueWithShadow<u128> SimpleRegion::read128(u32 offset)
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{
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VERIFY(offset + 15 < size());
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u128 value, shadow;
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ByteReader::load(m_data + offset, value);
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ByteReader::load(m_shadow_data + offset, shadow);
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return { value, shadow };
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}
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ValueWithShadow<u256> SimpleRegion::read256(u32 offset)
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{
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VERIFY(offset + 31 < size());
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u256 value, shadow;
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ByteReader::load(m_data + offset, value);
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ByteReader::load(m_shadow_data + offset, shadow);
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return { value, shadow };
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}
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void SimpleRegion::write8(u32 offset, ValueWithShadow<u8> value)
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{
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VERIFY(offset < size());
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m_data[offset] = value.value();
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m_shadow_data[offset] = value.shadow()[0];
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}
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void SimpleRegion::write16(u32 offset, ValueWithShadow<u16> value)
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{
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VERIFY(offset + 1 < size());
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ByteReader::store(m_data + offset, value.value());
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ByteReader::store(m_shadow_data + offset, value.shadow());
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}
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void SimpleRegion::write32(u32 offset, ValueWithShadow<u32> value)
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{
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VERIFY(offset + 3 < size());
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ByteReader::store(m_data + offset, value.value());
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ByteReader::store(m_shadow_data + offset, value.shadow());
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}
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void SimpleRegion::write64(u32 offset, ValueWithShadow<u64> value)
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{
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VERIFY(offset + 7 < size());
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ByteReader::store(m_data + offset, value.value());
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ByteReader::store(m_shadow_data + offset, value.shadow());
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}
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void SimpleRegion::write128(u32 offset, ValueWithShadow<u128> value)
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{
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VERIFY(offset + 15 < size());
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ByteReader::store(m_data + offset, value.value());
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ByteReader::store(m_shadow_data + offset, value.shadow());
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}
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void SimpleRegion::write256(u32 offset, ValueWithShadow<u256> value)
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{
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VERIFY(offset + 31 < size());
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ByteReader::store(m_data + offset, value.value());
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ByteReader::store(m_shadow_data + offset, value.shadow());
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}
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u8* SimpleRegion::cacheable_ptr(u32 offset)
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{
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return m_data + offset;
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}
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}
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