#pragma once

#include <lcrash/types.h>

/**
 * bwaaaaaa, the many ways to touch PCI things
 */
struct [[gnu::packed]] PciConfigurationSpaceHeader {
	u16 VendorID;
	u16 DeviceID;
	u16 Status;
	u16 Command;
	u8  RevisionID : 8;
	u8  ProgIF;
	u8  Subclass;
	u8  Class;
	u8  CacheLineSize;
	u8  MasterLatencyTimer;
	u8  HeaderType;
	u8  BIST;
	union {
		struct {
			u32 BAR0;
			u32 BAR1;
			u32 BAR2;
			u32 BAR3;
			u32 BAR4;
			u32 BAR5;
			u32 CIS;
			u16 SubsystemVendor;
			u16 Subsystem;
			u32 ExpansionROM;
			u8  Reserved[3];
		};
		u8 Reserved2[0x20];
	};
	u8  CapabilitiesPointer;
	u8  Reserved3[7];
	u8  InterruptLine;
	u8  InterruptPin;
	u8  Reserved4[2];
};

/**
 * PCI Host Controller device for the system bus
 */
struct PciSBHostController {
	u8 Bus;
	u8 Device;

	u8 OwnedBusCount;
	u8 OwnedBusses[8];
};

/**
 * PCI Host Controller device create arguments
 */
struct PciSBHostController_CreateArgs {
	u8 Bus;
	u8 Device;

	u8 OwnedBusCount;
	u8 OwnedBusses[8];
};

/**
 * Unknown PCI device
 */
struct PciSBMiscDevice {
	u8 Bus;
	u8 Device;

	u8 Class;
	u8 Subclass;
	u8 ProgInterface;
};

typedef struct PciSBMiscDevice PciSBMiscDevice_CreateArgs;

/**
 * Initialize the PCI code.
 */
void PciInitialize();

/// PCI is usable
bool PciPresent();

/// PCIE is usable
bool PciePresent();