serenity/Kernel/Storage/StorageManagement.cpp

/*
 * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/FileSystem/Ext2FileSystem.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/Storage/IDEController.h>
#include <Kernel/Storage/Partition/EBRPartitionTable.h>
#include <Kernel/Storage/Partition/GUIDPartitionTable.h>
#include <Kernel/Storage/Partition/MBRPartitionTable.h>
#include <Kernel/Storage/StorageManagement.h>

namespace Kernel {

static StorageManagement* s_the;

StorageManagement::StorageManagement(String root_device, bool force_pio)
    : m_controllers(enumerate_controllers(force_pio))
    , m_storage_devices(enumerate_storage_devices())
    , m_disk_partitions(enumerate_disk_partitions())
    , m_boot_device(determine_boot_device(root_device))
    , m_boot_block_device(determine_boot_block_device(root_device))
{
}

NonnullRefPtrVector<StorageController> StorageManagement::enumerate_controllers(bool force_pio) const
{
    NonnullRefPtrVector<StorageController> controllers;
    PCI::enumerate([&](const PCI::Address& address, PCI::ID) {
        if (PCI::get_class(address) == 0x1 && PCI::get_subclass(address) == 0x1) {
            controllers.append(IDEController::initialize(address, force_pio));
        }
    });
    return controllers;
}

NonnullRefPtrVector<StorageDevice> StorageManagement::enumerate_storage_devices() const
{
    ASSERT(!m_controllers.is_empty());
    NonnullRefPtrVector<StorageDevice> devices;
    for (auto& controller : m_controllers) {
        for (size_t device_index = 0; device_index < controller.devices_count(); device_index++) {
            auto device = controller.device(device_index);
            if (device.is_null())
                continue;
            devices.append(device.release_nonnull());
        }
    }
    return devices;
}

OwnPtr<PartitionTable> StorageManagement::try_to_initialize_partition_table(const StorageDevice& device) const
{
    auto mbr_table_or_result = MBRPartitionTable::try_to_initialize(device);
    if (!mbr_table_or_result.is_error())
        return move(mbr_table_or_result.value());
    if (mbr_table_or_result.error() == PartitionTable::Error::MBRProtective) {
        auto gpt_table_or_result = GUIDPartitionTable::try_to_initialize(device);
        if (gpt_table_or_result.is_error())
            return nullptr;
        return move(gpt_table_or_result.value());
    }
    if (mbr_table_or_result.error() == PartitionTable::Error::ConatinsEBR) {
        auto ebr_table_or_result = EBRPartitionTable::try_to_initialize(device);
        if (ebr_table_or_result.is_error())
            return nullptr;
        return move(ebr_table_or_result.value());
    }
    return nullptr;
}

NonnullRefPtrVector<DiskPartition> StorageManagement::enumerate_disk_partitions() const
{
    ASSERT(!m_storage_devices.is_empty());
    NonnullRefPtrVector<DiskPartition> partitions;
    size_t device_index = 0;
    for (auto& device : m_storage_devices) {
        auto partition_table = try_to_initialize_partition_table(device);
        if (!partition_table)
            continue;
        for (size_t partition_index = 0; partition_index < partition_table->partitions_count(); partition_index++) {
            auto partition_metadata = partition_table->partition(partition_index);
            if (!partition_metadata.has_value())
                continue;
            // FIXME: Try to not hardcode a maximum of 16 partitions per drive!
            auto disk_partition = DiskPartition::create(const_cast<StorageDevice&>(device), (partition_index + (16 * device_index)), partition_metadata.value());
            partitions.append(disk_partition);
            const_cast<StorageDevice&>(device).m_partitions.append(disk_partition);
        }
        device_index++;
    }
    return partitions;
}

NonnullRefPtr<StorageDevice> StorageManagement::determine_boot_device(String root_device) const
{
    ASSERT(!m_controllers.is_empty());
    if (!root_device.starts_with("/dev/hd")) {
        klog() << "init_stage2: root filesystem must be on an hard drive";
        Processor::halt();
    }
    auto drive_letter = root_device.substring(strlen("/dev/hd"), root_device.length() - strlen("/dev/hd"))[0];

    if (drive_letter < 'a' || drive_letter > 'z') {
        klog() << "init_stage2: root filesystem must be on an hard drive name";
        Processor::halt();
    }

    size_t drive_index = (u8)drive_letter - (u8)'a';
    if (drive_index >= m_storage_devices.size()) {
        klog() << "init_stage2: invalid selection of hard drive.";
        Processor::halt();
    }
    return m_storage_devices[drive_index];
}

NonnullRefPtr<BlockDevice> StorageManagement::determine_boot_block_device(String root_device) const
{
    auto determined_boot_device = m_boot_device;
    root_device = root_device.substring(strlen("/dev/hda"), root_device.length() - strlen("/dev/hda"));
    if (!root_device.length())
        return determined_boot_device;

    auto partition_number = root_device.to_uint();

    if (!partition_number.has_value()) {
        klog() << "init_stage2: couldn't parse partition number from root kernel parameter";
        Processor::halt();
    }

    if (partition_number.value() > m_boot_device->m_partitions.size()) {
        klog() << "init_stage2: invalid partition number!";
        Processor::halt();
    }

    return m_boot_device->m_partitions[partition_number.value() - 1];
}

NonnullRefPtr<BlockDevice> StorageManagement::boot_block_device() const
{
    return m_boot_block_device;
}

NonnullRefPtr<FS> StorageManagement::root_filesystem() const
{
    auto e2fs = Ext2FS::create(*FileDescription::create(boot_block_device()));
    if (!e2fs->initialize()) {
        klog() << "init_stage2: couldn't open root filesystem";
        Processor::halt();
    }
    return e2fs;
}

bool StorageManagement::initialized()
{
    return (s_the != nullptr);
}

void StorageManagement::initialize(String root_device, bool force_pio)
{
    ASSERT(!StorageManagement::initialized());
    s_the = new StorageManagement(root_device, force_pio);
}

StorageManagement& StorageManagement::the()
{
    return *s_the;
}

NonnullRefPtrVector<StorageController> StorageManagement::ide_controllers() const
{
    NonnullRefPtrVector<StorageController> ide_controllers;
    for (auto& controller : m_controllers) {
        if (controller.type() == StorageController::Type::IDE)
            ide_controllers.append(controller);
    }
    return ide_controllers;
}
}