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469f20d4ee
The StorageManagement class has 2 roles: 1. During boot, it should find all storage controllers in the machine, and then determine what is the boot device. 2. Later on boot, it is a registrar of all storage controllers and storage devices. Thus, it could be used to show information about these devices when implemented. This change allows the user to specify a boot driver other than /dev/hda and if it's connected in the machine - it will boot.
121 lines
4.2 KiB
C++
121 lines
4.2 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/Devices/BlockDevice.h>
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#include <Kernel/PCI/Access.h>
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#include <Kernel/Storage/IDEController.h>
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#include <Kernel/Storage/StorageManagement.h>
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namespace Kernel {
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static StorageManagement* s_the;
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StorageManagement::StorageManagement(String root_device, bool force_pio)
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: m_controllers(enumerate_controllers(force_pio))
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, m_boot_device(determine_boot_device(root_device))
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{
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}
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NonnullRefPtr<StorageDevice> StorageManagement::determine_boot_device(String root_device) const
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{
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ASSERT(!m_controllers.is_empty());
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if (!root_device.starts_with("/dev/hd")) {
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klog() << "init_stage2: root filesystem must be on an hard drive";
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Processor::halt();
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}
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auto drive_letter = root_device.substring(strlen("/dev/hd"), root_device.length() - strlen("/dev/hd"))[0];
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if (drive_letter < 'a' || drive_letter > 'z') {
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klog() << "init_stage2: root filesystem must be on an hard drive name";
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Processor::halt();
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}
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size_t drive_index = (u8)drive_letter - (u8)'a';
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auto devices = storage_devices();
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if (drive_index >= devices.size()) {
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klog() << "init_stage2: invalid selection of hard drive.";
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Processor::halt();
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}
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return devices[drive_index];
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}
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NonnullRefPtrVector<StorageController> StorageManagement::enumerate_controllers(bool force_pio) const
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{
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NonnullRefPtrVector<StorageController> controllers;
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PCI::enumerate([&](const PCI::Address& address, PCI::ID) {
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if (PCI::get_class(address) == 0x1 && PCI::get_subclass(address) == 0x1) {
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controllers.append(IDEController::initialize(address, force_pio));
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}
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});
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return controllers;
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}
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NonnullRefPtrVector<StorageDevice> StorageManagement::storage_devices() const
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{
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NonnullRefPtrVector<StorageDevice> devices;
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for (auto& controller : m_controllers) {
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for (size_t index = 0; index < controller.devices_count(); index++) {
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auto device = controller.device(index);
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if (device.is_null())
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continue;
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devices.append(device.release_nonnull());
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}
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}
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return devices;
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}
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bool StorageManagement::initialized()
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{
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return (s_the != nullptr);
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}
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void StorageManagement::initialize(String root_device, bool force_pio)
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{
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ASSERT(!StorageManagement::initialized());
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s_the = new StorageManagement(root_device, force_pio);
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}
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StorageManagement& StorageManagement::the()
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{
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return *s_the;
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}
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NonnullRefPtr<StorageDevice> StorageManagement::boot_device() const
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{
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return m_boot_device;
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}
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NonnullRefPtrVector<StorageController> StorageManagement::ide_controllers() const
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{
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NonnullRefPtrVector<StorageController> ide_controllers;
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for (auto& controller : m_controllers) {
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if (controller.type() == StorageController::Type::IDE)
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ide_controllers.append(controller);
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}
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return ide_controllers;
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}
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}
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