mirror of
https://github.com/RGBCube/serenity
synced 2025-06-19 23:32:07 +00:00
6f43f81fb4
This implements a passthrough disk driver that translates the read/write block addresses by a fixed offset. This could form the basis of MBR partition support if we were to parse the MBR table at boot and create that OffsetDiskDevice dynamically, rather than seeking to a fixed offset. This also introduces a dependency in the form of grub. You'll need to have 32-bit grub binaries installed to build the project now. As a bonus, divorcing Serenity from qemu's kernel loading means we can now *technically* boot on real hardware. It just... doesn't get very far yet. If you write the `_disk_image` file to an IDE hard drive and boot it in a machine that supports all the basic PC hardware, it *will* start loading the kernel.
63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
#include <Kernel/Devices/OffsetDiskDevice.h>
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// #define OFFD_DEBUG
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Retained<OffsetDiskDevice> OffsetDiskDevice::create(Retained<DiskDevice>&& device, unsigned offset)
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{
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return adopt(*new OffsetDiskDevice(move(device), offset));
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}
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OffsetDiskDevice::OffsetDiskDevice(Retained<DiskDevice>&& device, unsigned offset)
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: m_device(move(device)), m_offset(offset)
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{
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}
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OffsetDiskDevice::~OffsetDiskDevice()
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{
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}
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unsigned OffsetDiskDevice::block_size() const
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{
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return m_device->block_size();
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}
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bool OffsetDiskDevice::read_block(unsigned index, byte* out) const
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{
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#ifdef OFFD_DEBUG
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kprintf("OffsetDiskDevice::read_block %u (really: %u)\n", index, m_offset + index);
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#endif
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return m_device->read_block(m_offset + index, out);
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}
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bool OffsetDiskDevice::write_block(unsigned index, const byte* data)
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{
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#ifdef OFFD_DEBUG
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kprintf("OffsetDiskDevice::write_block %u (really: %u)\n", index, m_offset + index);
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#endif
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return m_device->write_block(m_offset + index, data);
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}
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bool OffsetDiskDevice::read_blocks(unsigned index, word count, byte* out)
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{
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#ifdef OFFD_DEBUG
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kprintf("OffsetDiskDevice::read_blocks %u (really: %u) count=%u\n", index, m_offset + index, count);
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#endif
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return m_device->read_blocks(m_offset + index, count, out);
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}
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bool OffsetDiskDevice::write_blocks(unsigned index, word count, const byte* data)
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{
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#ifdef OFFD_DEBUG
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kprintf("OffsetDiskDevice::write_blocks %u (really: %u) count=%u\n", index, m_offset + index, count);
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#endif
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return m_device->write_blocks(m_offset + index, count, data);
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}
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const char* OffsetDiskDevice::class_name() const
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{
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return "OffsetDiskDevice";
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}
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