mirror of
https://github.com/RGBCube/serenity
synced 2025-05-15 01:54:57 +00:00
d49a35df31
Instead of letting the user to determine whether framebuffer devices will be created (which is useless because they are gone by now), let's simplify the flow by allowing the user to choose between full, limited or disabled functionality. The determination happens only once, so, if the user decided to disable graphics support, the initialize method exits immediately. If limited functionality is chosen, then a generic DisplayConnector is initialized with the preset framebuffer resolution, if present, and then the initialize method exits. As a default, the code proceeds to initialize all drivers as usual.
97 lines
5.8 KiB
Markdown
97 lines
5.8 KiB
Markdown
## Name
|
|
|
|
Boot Parameters - optional parameters accepted by the kernel
|
|
|
|
## Description
|
|
|
|
Serenity's kernel can process parameters at boot time.
|
|
This functionality is used to control or augment the state of features during the initial
|
|
startup of the system.
|
|
|
|
### Options
|
|
|
|
The kernel boot parameters take the form of **`{option_name}={value}`**, where the **`={value}`**
|
|
trailer can be omitted for specific parameters.
|
|
|
|
List of options:
|
|
|
|
* **`acpi`** - This parameter expects one of the following values. **`on`** - Boot with full ACPI support, using ACPI
|
|
Machine Language interpretation (default). **`limited`** - Boot with limited ACPI support. **`off`** - Don't initialize ACPI at all.
|
|
|
|
* **`ahci_reset_mode`** - This parameter expects one of the following values. **`controllers`** - Reset just the AHCI controller on boot (default).
|
|
**`aggressive`** - Reset the AHCI controller, and all AHCI ports on boot.
|
|
|
|
* **`boot_prof`** - If present on the command line, global system profiling will be enabled
|
|
as soon as possible during the boot sequence. Allowing you to profile startup of all applications.
|
|
|
|
* **`disable_ide`** - If present on the command line, the IDE controller will not be initialized
|
|
during the boot sequence. Leaving only the AHCI and Ram Disk controllers.
|
|
|
|
* **`disable_physical_storage`** - If present on the command line, neither AHCI, or IDE controllers will be initialized on boot.
|
|
|
|
* **`disable_ps2_controller`** - If present on the command line, the I8042 keyboard controller will not be initialized on boot.
|
|
|
|
* **`disable_uhci_controller`** - If present on the command line, the UHCI controller will not be initialized on boot.
|
|
|
|
* **`disable_virtio`** - If present on the command line, virtio devices will not be detected, and initialized on boot.
|
|
|
|
* **`early_boot_console`** - This parameter expects **`on`** or **`off`** and is by default set to **`on`**.
|
|
When set to **`off`**, the kernel will not initialize any early console to show kernel dmesg output.
|
|
When set to **`on`**, the kernel will try to initialize either a text mode console (if VGA text mode was detected)
|
|
or framebuffer console, based on what the Multiboot bootloader specified on the physical address, width, height
|
|
and bit color depth.
|
|
|
|
* **`enable_ioapic`** - This parameter expects **`on`** or **`off`** and is by default set to **`on`**.
|
|
When set to **`off`**, the kernel will initialize the two i8259 PICs.
|
|
When set to **`on`**, the kernel will try to initialize the IOAPIC (or IOAPICs if there's more than one),
|
|
but only if **`acpi`** is set to **`limited`** or **`on`**, and a `MADT` (APIC) table is available.
|
|
Otherwise, the kernel will fallback to use the i8259 PICs.
|
|
|
|
* **`graphics_subsystem_mode`** - This parameter expects one of the following values. **`on`**- Boot into the graphical environment if possible (default). **`off`** - Boot into text mode, don't initialize any driver. **`limited`** - Boot into the pre-defined framebuffer that the bootloader
|
|
has set up before booting the Kernel, don't initialize any driver.
|
|
|
|
* **`force_pio`** - If present on the command line, the IDE controllers will be force into PIO mode when initialized IDE Channels on boot.
|
|
|
|
* **`hpet`** - This parameter expects one of the following values. **`periodic`** - The High Precision Event Timer should
|
|
be configured in a periodic mode. **`nonperiodic`** - The High Precision Event Timer should eb configure din non-periodic mode.
|
|
|
|
* **`init`** - This parameter expects the fully qualified path to the init program the Kernel should launch after boot.
|
|
This defaults to [`SystemServer`(7)](help://man/7/SystemServer).
|
|
|
|
* **`init_args`** - This parameter expects a set of arguments to pass to the **`init`** program.
|
|
The value should be a set of strings separated by `,` characters.
|
|
|
|
* **`panic`** - This parameter expects **`halt`** or **`shutdown`**. This is particularly useful in CI contexts.
|
|
|
|
* **`pci`** - This parameter expects **`ecam`**, **`io`** or **`none`**. When selecting **`none`**
|
|
the kernel will not use PCI resources/devices.
|
|
|
|
* **`root`** - This parameter configures the device to use as the root file system. It defaults to **`/dev/hda`** if unspecified.
|
|
|
|
* **`pcspeaker`** - This parameter controls whether the kernel can use the PC speaker or not. It defaults to **`off`** and can be set to **`on`** to enable the PC speaker.
|
|
|
|
* **`smp`** - This parameter expects a binary value of **`on`** or **`off`**. If enabled kernel will
|
|
enable available APs (application processors) and use them with the BSP (Bootstrap processor) to
|
|
schedule and run threads.
|
|
This parameter defaults to **`off`**. This parameter requires **`enable_ioapic`** to be enabled
|
|
and a `MADT` (APIC) table to be available.
|
|
|
|
* **`nvme_poll`** - This parameter configures the NVMe drive to use polling instead of interrupt driven completion.
|
|
|
|
* **`system_mode`** - This parameter is not interpreted by the Kernel, and is made available at `/proc/system_mode`. SystemServer uses it to select the set of services that should be started. Common values are:
|
|
- **`graphical`** (default) - Boots the system in the normal graphical mode.
|
|
- **`self-test`** - Boots the system in self-test, validation mode.
|
|
- **`text`** - Boots the system in text only mode. (You may need to also set **`fbdev=off`**.)
|
|
|
|
* **`time`** - This parameter expects one of the following values. **`modern`** - This configures the system to attempt
|
|
to use High Precision Event Timer (HPET) on boot. **`legacy`** - Configures the system to use the legacy programmable interrupt
|
|
time for managing system team.
|
|
|
|
* **`vmmouse`** - This parameter expects a binary value of **`on`** or **`off`**. If enabled and
|
|
running on a VMWare Hypervisor, the kernel will enable absolute mouse mode.
|
|
|
|
* **`disable_kaslr`** - If present on the command line, the KASLR security mitigation will be disabled.
|
|
|
|
## See also
|
|
|
|
* [`SystemServer`(7)](help://man/7/SystemServer).
|