Some basic framework for PCI(e) enumeration

include/sys/amd64/hw/ahci.h

@@ -1,7 +1,7 @@
 #pragma once
-#include "sys/amd64/hw/pci/pci.h"
 
 struct ahci_registers;
+struct pci_device;
 
 struct ahci_fis_reg_h2d {
     uint8_t type;
@@ -26,7 +26,7 @@ struct ahci_fis_reg_h2d {
 };
 
 struct ahci_controller {
-//    pci_addr_t addr;
+    struct pci_device *pci_dev;
     uintptr_t abar_phys;
     struct ahci_registers *regs;
 };

include/sys/amd64/hw/pci/pci.h

@@ -10,14 +10,22 @@
 #define PCI_CONFIG_INFO             0x0C
 #define PCI_CONFIG_BAR(n)           (0x10 + (n) * 4)
 #define PCI_CONFIG_SUBSYSTEM        0x2C
+#define PCI_CONFIG_CAPABILITIES     0x34
 #define PCI_CONFIG_IRQ              0x3C
 
 #define PCI_CONFIG_BRIDGE           0x18
 
 #define PCI_ID(vnd, dev)            (((uint32_t) (vnd)) | ((uint32_t) (dev) << 16))
 
+struct pci_device;
+typedef void (*pci_driver_func_t)(struct pci_device *dev);
+
 void pci_init(void);
 void pci_add_root_bus(uint8_t n);
 
+uint32_t pci_config_read_dword(struct pci_device *dev, uint16_t off);
+
+void pci_add_class_driver(uint32_t full_class, pci_driver_func_t func);
+
 // pcidb.c
 const char *pci_class_string(uint16_t full_class);