acpi.h

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#pragma once
 
#include <kernel/fs/sysfs.h>
 
#include <boot/boot_info.h>
#include <kernel/defs.h>
 
#include <stdint.h>
 
#define RSDP_CURRENT_REVISION 2
 
#define SDT_SIGNATURE_LENGTH 4
 
#define SDT_OEM_ID_LENGTH 6
 
#define SDT_OEM_TABLE_ID_LENGTH 8
 
typedef struct PACKED
{
    uint8_t signature[SDT_SIGNATURE_LENGTH];
    uint32_t length;
    uint8_t revision;
    uint8_t checkSum;
    uint8_t oemId[SDT_OEM_ID_LENGTH];
    uint8_t oemTableId[SDT_OEM_TABLE_ID_LENGTH];
    uint32_t oemRevision;
    uint32_t creatorID;
    uint32_t creatorRevision;
} sdt_header_t;
 
#define RSDP_SIGNATURE_LENGTH 8
 
typedef struct PACKED
{
    char signature[RSDP_SIGNATURE_LENGTH];
    uint8_t checksum; 
    char oemId[SDT_OEM_ID_LENGTH];
    uint8_t revision;
    uint32_t rsdtAddress;
    uint32_t length;
    uint64_t xsdtAddress;
    uint8_t extendedChecksum; 
    uint8_t reserved[3];
} rsdp_t;
 
#define RSDP_V1_LENGTH 20
 
typedef struct PACKED
{
    sdt_header_t header;
    sdt_header_t* tables[];
} xsdt_t;
 
bool acpi_is_checksum_valid(void* table, uint64_t length);
 
dentry_t* acpi_get_sysfs_root(void);
 
void acpi_reclaim_memory(const boot_memory_map_t* map);