1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_PCI_DIRECT_H 3 #define _ASM_X86_PCI_DIRECT_H 4 5 #include <linux/types.h> 6 7 /* Direct PCI access. This is used for PCI accesses in early boot before 8 the PCI subsystem works. */ 9 10 extern u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset); 11 extern u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset); 12 extern u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset); 13 extern void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset, u32 val); 14 extern void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val); 15 extern void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val); 16 17 extern int early_pci_allowed(void); 18 #endif /* _ASM_X86_PCI_DIRECT_H */ 19