Espresso/include/drivers/pci.h

#ifndef _PCI_H
#define _PCI_H

#include <types.h>

struct pci_header {
  uint16_t vendor_id;
  uint16_t device_id;

  uint16_t command;
  uint16_t status;

  uint8_t revision_id;
  uint8_t prog_if;
  uint8_t subclass;
  uint8_t class_code;

  uint8_t cache_line_size;
  uint8_t latency_timer;
  uint8_t header_type;
  uint8_t bist;
} __attribute__((packed));

struct pci_header_type_0 {
  uint16_t vendor_id;
  uint16_t device_id;

  uint16_t command;
  uint16_t status;

  uint8_t revision_id;
  uint8_t prog_if;
  uint8_t subclass;
  uint8_t class_code;

  uint8_t cache_line_size;
  uint8_t latency_timer;
  uint8_t header_type;
  uint8_t bist;

  uint32_t bar0;
  uint32_t bar1;
  uint32_t bar2;
  uint32_t bar3;
  uint32_t bar4;
  uint32_t bar5;

  uint32_t cardbus_cis_ptr;
  uint16_t subsystem_vendor_id;
  uint16_t subsystem_id;

  uint32_t expansion_rom_base;

  uint8_t capabilities_ptr;
  uint8_t reserved1[3];

  uint32_t reserved2;

  uint8_t interrupt_line;
  uint8_t interrupt_pin;
  uint8_t min_grant;
  uint8_t max_latency;
} __attribute__((packed));

uint32_t pci_config_read(uint8_t bus, uint8_t device, uint8_t function, uint8_t offset);
void pci_config_write(uint8_t bus, uint8_t device, uint8_t function, uint8_t offset, uint32_t value);
void pci_enumerate(void);

#endif