mirror of
https://github.com/RGBCube/serenity
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c02b8b715d
This implements a basic MBR partition loader, which removes the reliance on a hard-coded filesystem offset in the stage2 init.
47 lines
993 B
C++
47 lines
993 B
C++
#pragma once
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#include <AK/RetainPtr.h>
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#include <AK/Vector.h>
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#include <Kernel/Devices/DiskDevice.h>
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#include <Kernel/Devices/DiskPartition.h>
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#define MBR_SIGNATURE 0xaa55
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struct MBRPartitionEntry {
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byte status;
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byte chs1[3];
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byte type;
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byte chs2[3];
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dword offset;
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dword length;
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} __attribute__((packed));
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struct MBRPartitionHeader {
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byte code1[218];
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word ts_zero;
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byte ts_drive, ts_seconds, ts_minutes, ts_hours;
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byte code2[216];
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dword disk_signature;
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word disk_signature_zero;
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MBRPartitionEntry entry[4];
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word mbr_signature;
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} __attribute__((packed));
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class MBRPartitionTable {
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AK_MAKE_ETERNAL
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public:
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MBRPartitionTable(Retained<DiskDevice>&& device);
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~MBRPartitionTable();
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bool initialize();
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RetainPtr<DiskPartition> partition(unsigned index);
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private:
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Retained<DiskDevice> m_device;
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ByteBuffer read_header() const;
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const MBRPartitionHeader& header() const;
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byte m_cached_header[512];
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};
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