cregit-Linux how code gets into the kernel

Release 4.12 include/uapi/linux/pci.h

/*
 *      pci.h
 *
 *      PCI defines and function prototypes
 *      Copyright 1994, Drew Eckhardt
 *      Copyright 1997--1999 Martin Mares <mj@ucw.cz>
 *
 *      For more information, please consult the following manuals (look at
 *      http://www.pcisig.com/ for how to get them):
 *
 *      PCI BIOS Specification
 *      PCI Local Bus Specification
 *      PCI to PCI Bridge Specification
 *      PCI System Design Guide
 */

#ifndef _UAPILINUX_PCI_H

#define _UAPILINUX_PCI_H

#include <linux/pci_regs.h>	/* The pci register defines */

/*
 * The PCI interface treats multi-function devices as independent
 * devices.  The slot/function address of each device is encoded
 * in a single byte as follows:
 *
 *      7:3 = slot
 *      2:0 = function
 */

#define PCI_DEVFN(slot, func)	((((slot) & 0x1f) << 3) | ((func) & 0x07))

#define PCI_SLOT(devfn)		(((devfn) >> 3) & 0x1f)

#define PCI_FUNC(devfn)		((devfn) & 0x07)

/* Ioctls for /proc/bus/pci/X/Y nodes. */

#define PCIIOC_BASE		('P' << 24 | 'C' << 16 | 'I' << 8)

#define PCIIOC_CONTROLLER	(PCIIOC_BASE | 0x00)	
/* Get controller for PCI device. */

#define PCIIOC_MMAP_IS_IO	(PCIIOC_BASE | 0x01)	
/* Set mmap state to I/O space. */

#define PCIIOC_MMAP_IS_MEM	(PCIIOC_BASE | 0x02)	
/* Set mmap state to MEM space. */

#define PCIIOC_WRITE_COMBINE	(PCIIOC_BASE | 0x03)	
/* Enable/disable write-combining. */

#endif /* _UAPILINUX_PCI_H */

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