28 lines
2.5 KiB
Markdown
28 lines
2.5 KiB
Markdown
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---
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title: "rsdp.h"
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summary: "The infrastructure to parse the _Root System Description Pointer_ Table"
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---
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OSDev Wiki: [RSDP](https://wiki.osdev.org/RSDP)
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# `rsdp_descriptor_v1_T` - struct [packed]
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The RSDP Table used in ACPI v1.0
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| Name | Type | Description |
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|--------------|----------|-----------------------------------------------------------|
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| signature | char[8] | Needs to be `"RSD PTR "` (with the withespace at the end) |
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| checksum | uint8_t | Used to validate the table |
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| oem_id | char[6] | This string identifies the OEM |
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| revision | uint8_t | Tells whether the RSDP is version 1 or 2+ |
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| rsdt_address | uint32_t | The Physical Address of the RSDT |
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# `rsdp_descriptor_v2_T` - struct [packed]
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The RSDP Table used in ACPI v2.0 or higher
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| Name | Type | Description |
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|-------------------|-------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------|
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| 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 |
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| length | uint32_t | The size of the whole table |
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| xsdt_address | uint64_t | The Address of the XSDT (when available this should be used instead of the RSDT) |
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| checksum_extended | uint8_t | Used to calculate the checksum of the whole table |
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| reserved | uint8_t[3] | Can be ignored |
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