Struct rstubs::arch::acpi::Rsdp

#[repr(C, packed(1))]
struct Rsdp {
    signature: [u8; 8],
    checksum: u8,
    oem_id: [u8; 6],
    revision: u8,
    rsdt_address: u32,
    length: u32,
    xsdt_address: u64,
    ext_checksum: u8,
    reserved: [u8; 3],
}

The first structure found in ACPI. It just tells us where the RSDT is.

On BIOS systems, it is either found in the first 1KB of the Extended Bios Data Area, or between 0x000E0000 and 0x000FFFFF. The signature is always on a 16 byte boundary. On (U)EFI, it may not be located in these locations, and so an address should be found in the EFI configuration table instead.

The recommended way of locating the RSDP is to let the bootloader do it - Multiboot2 can pass a tag with the physical address of it. If this is not possible, a manual scan can be done.

If revision > 0, (the hardware ACPI version is Version 2.0 or greater), the RSDP contains some new fields. For ACPI Version 1.0, these fields are not valid and should not be accessed. For ACPI Version 2.0+, xsdt_address should be used (truncated to u32 on x86) instead of rsdt_address.

Fields

signature: [u8; 8]

checksum: u8

oem_id: [u8; 6]

Name of the vendor

revision: u8

Version number

rsdt_address: u32

Address of the Root System Description Table

length: u32

xsdt_address: u64

ext_checksum: u8

reserved: [u8; 3]

Implementations

impl Rsdp

unsafe fn search_for_on_bios() -> Result<&'static Rsdp, ApicError>

This searches for a RSDP on BIOS systems.

fn validate(&self) -> Result<(), ApicError>

Checks that: 1) The signature is correct 2) The checksum is correct 3) For Version 2.0+, that the extension checksum is correct

fn oem_id(&self) -> &str

Trait Implementations

impl Clone for Rsdp

fn clone(&self) -> Rsdp

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Rsdp

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for Rsdp