#ifndef ARCH_ACPI_H_
#define ARCH_ACPI_H_

#include <socks/compiler.h>
#include <socks/status.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

#define ACPI_MADT_LAPIC  0x00
#define ACPI_MADT_IOAPIC 0x01
#define ACPI_MADT_IRQSRC_OVERRIDE 0x02
#define ACPI_MADT_LAPIC_OVERRIDE 0x05

#define ACPI_SIG_RSDP 0x2052545020445352ULL
#define ACPI_SIG_FADT 0x50434146
#define ACPI_SIG_MADT 0x43495041

#define AP_TRAMPOLINE_PADDR   0x8000
#define LAPIC_IPI_STATUS_REG  0x0280
#define LAPIC_IPI_DEST_REG    0x0310
#define LAPIC_IPI_ICR_REG     0x0300

struct acpi_rsdp_10 {
	char r_sig[8];
	uint8_t r_chksum;
	char r_oem[6];
	uint8_t r_revision;
	uint32_t r_rsdt_ptr;
} __packed;

struct acpi_rsdp_20 {
	struct acpi_rsdp_10 r_base;

	uint32_t r_length;
	uint64_t r_xsdt_ptr;
	uint8_t r_chksum_ext;
	uint8_t r_reserved[3];
} __packed;

struct acpi_rsdp {
	union {
		struct acpi_rsdp_10 rsdp_10;
		struct acpi_rsdp_20 rsdp_20;
	};
} __packed;

struct acpi_sdt {
	char s_sig[4];
	uint32_t s_length;
	uint8_t s_revision;
	uint8_t s_chksum;
	char s_oem[6];
	char s_oem_table[8];
	uint32_t s_oem_revision;
	uint32_t s_creator;
	uint32_t s_creator_revision;
} __packed;

struct acpi_rsdt {
	struct acpi_sdt r_header;
	uint32_t r_tables[1];
} __packed;

struct acpi_xsdt {
	struct acpi_sdt x_header;
	uint64_t x_tables[1];
} __packed;

struct acpi_madt {
	struct acpi_sdt m_base;
	uint32_t m_lapic_ptr;
	uint32_t m_flags;
} __packed;

struct acpi_madt_record {
	uint8_t r_type;
	uint8_t r_length;
} __packed;

struct acpi_madt_ioapic {
	uint8_t io_apic_id;
	uint8_t io_reserved;
	uint32_t io_address;
	uint32_t io_intbase;
} __packed;

struct acpi_madt_irqsrc_override {
	uint8_t irq_bus;
	/* the irq vector as delivered from the APIC to the CPU */
	uint8_t irq_destvec;
	/* the irq vector as delivered from the hardware to the APIC */
	uint32_t irq_srcvec;
	uint16_t irq_flags;
} __packed;

struct lapic_record {
	uint8_t l_cpu_id;
	uint8_t l_apic_id;
	uint32_t l_flags;
} __packed;

struct lapic_override_record {
	uint16_t l_reserved;
	uint64_t l_lapic_ptr;
} __packed;


extern kern_status_t acpi_init(void);
extern kern_status_t acpi_scan_cpu_topology(void);

extern kern_status_t ap_apic_init(void);
extern kern_status_t apic_init(void);
extern kern_status_t smp_init(void);

extern struct acpi_sdt *acpi_find_sdt(uint32_t sig);

extern void irq_ack(unsigned int vec);

#ifdef __cplusplus
}
#endif

#endif