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## 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`** - Booth with limited ACPI support. **`off`** - Don't initialize ACPI at all.
* **`ahci_reset_mode`** - This parameter expects one of the following values. **`controller`** - Reset just the AHCI controller on boot.
**`none`** - Don't perform any AHCI reset. **`complete`** - Reset the AHCI controller, and all AHCI ports on boot.
* **`boot_mode`** - This parameter expects one of the following values: **`text`** - Boots the system in text only mode.
**`self-test`** - Boots the system in self-test, validation mode. **`graphical`** - Boots the system in the normal graphical mode.
* **`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.
* **`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)](../man7/SystemServer.md).
* **`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.
* **`pci_ecam`** - This parameter expects **`on`** or **`off`**.
* **`root`** - This parameter configures the device to use as the root file system. It defaults to **`/dev/hda`** if unspecified.
* **`smp`** - This parameter expects a binary value of **`on`** or **`off`**. If enabled kernel will
use [APIC](https://en.wikipedia.org/wiki/Advanced_Programmable_Interrupt_Controller) mode
for handling interrupts instead of [PIC](https://en.wikipedia.org/wiki/Programmable_interrupt_controller) mode.
This parameter defaults to **`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.
## See also
* [`SystemServer`(7)](../man7/SystemServer.md).
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