sdt.h

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#ifndef _X86_SDT_H
#define _X86_SDT_H
 
#include <core/system.h>
 
/* x86: ACPI's tables, as the firmware lays them out (see the ACPI
 * specification). acpi.c finds them, apic.c and hpet.c read them. */

struct acpi_rsdp {
    char     signature[8];
    uint8_t  checksum;
    char     oem_id[6];
    uint8_t  rev;
    uint32_t rsdt;
} __packed;

struct acpi_rsdp2 {
    struct acpi_rsdp v1;
    uint32_t length;
    uint64_t xsdt;
    uint8_t  xchecksum;
    uint8_t  reserved[3];
} __packed;

struct acpi_sdt_header {
    char     signature[4];
    uint32_t length;
    uint8_t  rev;
    uint8_t  checksum;
    char     oemid[6];
    char     oem_table_id[8];
    uint32_t oem_rev;
    uint32_t creator_id;
    uint32_t creator_rev;
} __packed;

struct acpi_rsdt {
    struct acpi_sdt_header header;
    uint32_t sdt[0];
} __packed;

struct acpi_xsdt {
    struct acpi_sdt_header header;
    uint64_t sdt[0];
} __packed;

struct acpi_gas {
    uint8_t  space;         /* 0: memory, 1: I/O ports */
    uint8_t  bit_width;
    uint8_t  bit_offset;
    uint8_t  access_size;
    uint64_t address;
} __packed;

struct acpi_hpet {
    struct acpi_sdt_header header;
    uint32_t event_timer_block_id;
    struct acpi_gas address;
    uint8_t  hpet_number;
    uint16_t minimum_tick;
    uint8_t  page_protection;
} __packed;
 
/* The MADT (signature "APIC") lists the interrupt controllers, in
 * entries after its header, each with a type and a length. */
#define ACPI_MADT_LOCAL_APIC        0
#define ACPI_MADT_IO_APIC           1
#define ACPI_MADT_INT_SRC_OVERRIDE  2
#define ACPI_MADT_LOCAL_APIC_NMI    4
 
#define ACPI_MADT_PCAT_COMPAT       0x1     /* the machine has 8259s too */
 
#define ACPI_MADT_ENABLED           0x1     /* a local APIC's flag: its CPU is there */
 
/* an override's flags: the polarity (bits 0 and 1), the trigger mode
 * (bits 2 and 3) */
#define ACPI_MPS_POLARITY_MASK      0x3
#define ACPI_MPS_POLARITY_HIGH      0x1
#define ACPI_MPS_POLARITY_LOW       0x3
#define ACPI_MPS_TRIGGER_MASK       0xc
#define ACPI_MPS_TRIGGER_EDGE       0x4
#define ACPI_MPS_TRIGGER_LEVEL      0xc

struct acpi_madt_entry {
    uint8_t type;
    uint8_t length;
} __packed;

struct acpi_madt_local_apic {
    struct acpi_madt_entry entry;
    uint8_t  processor_id;
    uint8_t  apic_id;
    uint32_t flags;             /* bit 0: enabled */
} __packed;

struct acpi_madt_io_apic {
    struct acpi_madt_entry entry;
    uint8_t  id;
    uint8_t  reserved;
    uint32_t address;
    uint32_t gsi_base;
} __packed;

struct acpi_madt_override {
    struct acpi_madt_entry entry;
    uint8_t  bus;               /* 0: ISA */
    uint8_t  source;            /* the ISA IRQ */
    uint32_t gsi;
    uint16_t flags;
} __packed;

struct acpi_madt_local_apic_nmi {
    struct acpi_madt_entry entry;
    uint8_t  processor_id;      /* 0xff for all CPUs */
    uint16_t flags;
    uint8_t  lint;              /* LINT0 or LINT1 */
} __packed;

struct acpi_madt {
    struct acpi_sdt_header header;
    uint32_t local_apic_address;
    uint32_t flags;
} __packed;
 
#endif /* ! _X86_SDT_H */