pci-direct.h

linux 内核源代码

#ifndef ASM_PCI_DIRECT_H
#define ASM_PCI_DIRECT_H 1

#include <linux/types.h>

/* Direct PCI access. This is used for PCI accesses in early boot before
   the PCI subsystem works. */ 

extern u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset);
extern u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset);
extern u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset);
extern void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, u32 val);
extern void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val);

extern int early_pci_allowed(void);

#endif