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homepage/content/projects/noxos/docs/codebase/drivers/acpi/rsdp.h.md

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noxos (docs): merged 'boot' and 'drivers/acpi' docs from .wiki
2023-03-15 17:28:15 +00:00
---
title: "rsdp.h"
summary: "The infrastructure to parse the _Root System Description Pointer_ Table"
---
OSDev Wiki: [RSDP](https://wiki.osdev.org/RSDP)
# `rsdp_descriptor_v1_T` - struct [packed]
The RSDP Table used in ACPI v1.0
| Name | Type | Description |
|--------------|----------|-----------------------------------------------------------|
| signature | char[8] | Needs to be `"RSD PTR "` (with the withespace at the end) |
| checksum | uint8_t | Used to validate the table |
| oem_id | char[6] | This string identifies the OEM |
| revision | uint8_t | Tells whether the RSDP is version 1 or 2+ |
| rsdt_address | uint32_t | The Physical Address of the RSDT |
# `rsdp_descriptor_v2_T` - struct [packed]
The RSDP Table used in ACPI v2.0 or higher
| Name | Type | Description |
|-------------------|-------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------|
| descriptor_v1 | [rsdp_descriptor_v1_T](https://nerdcult.net/projects/noxos/docs/codebase/drivers/acpi/rsdp.h/#rsdp_descriptor_v1_t---struct-packed) | A table in the format of the ACPI 1.0 specification |
| length | uint32_t | The size of the whole table |
| xsdt_address | uint64_t | The Address of the XSDT (when available this should be used instead of the RSDT) |
| checksum_extended | uint8_t | Used to calculate the checksum of the whole table |
noxos (docs): documented the RSDP header verification functions
2023-03-19 14:59:50 +00:00
| reserved | uint8_t[3] | Can be ignored |
# `rsdp_descriptor_v1_verify(descriptor)` - function (bool)
Verifies the integrity of **_descriptor_**.
# `rsdp_descriptor_v2_verify(descriptor)` - function (bool)
Verifies the integrity of **_descriptor_**.