cregit-Linux how code gets into the kernel

Release 4.12 include/asm-generic/iomap.h

#ifndef __GENERIC_IO_H

#define __GENERIC_IO_H

#include <linux/linkage.h>
#include <asm/byteorder.h>

 * These are the "generic" interfaces for doing new-style
 * memory-mapped or PIO accesses. Architectures may do
 * their own arch-optimized versions, these just act as
 * wrappers around the old-style IO register access functions:
 * read[bwl]/write[bwl]/in[bwl]/out[bwl]
 * Don't include this directly, include it from <asm/io.h>.

 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
 * access or a MMIO access, these functions don't care. The info is
 * encoded in the hardware mapping set up by the mapping functions
 * (or the cookie itself, depending on implementation and hw).
 * The generic routines just encode the PIO/MMIO as part of the
 * cookie, and coldly assume that the MMIO IO mappings are not
 * in the low address range. Architectures for which this is not
 * true can't use this generic implementation.
extern unsigned int ioread8(void __iomem *);
extern unsigned int ioread16(void __iomem *);
extern unsigned int ioread16be(void __iomem *);
extern unsigned int ioread32(void __iomem *);
extern unsigned int ioread32be(void __iomem *);
#ifdef CONFIG_64BIT
extern u64 ioread64(void __iomem *);
extern u64 ioread64be(void __iomem *);

extern void iowrite8(u8, void __iomem *);
extern void iowrite16(u16, void __iomem *);
extern void iowrite16be(u16, void __iomem *);
extern void iowrite32(u32, void __iomem *);
extern void iowrite32be(u32, void __iomem *);
#ifdef CONFIG_64BIT
extern void iowrite64(u64, void __iomem *);
extern void iowrite64be(u64, void __iomem *);

 * "string" versions of the above. Note that they
 * use native byte ordering for the accesses (on
 * the assumption that IO and memory agree on a
 * byte order, and CPU byteorder is irrelevant).
 * They do _not_ update the port address. If you
 * want MMIO that copies stuff laid out in MMIO
 * memory across multiple ports, use "memcpy_toio()"
 * and friends.
extern void ioread8_rep(void __iomem *port, void *buf, unsigned long count);
extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count);
extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count);

extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);

/* Create a virtual mapping cookie for an IO port range */
extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
extern void ioport_unmap(void __iomem *);


#define ioremap_wc ioremap_nocache


#define ioremap_wt ioremap_nocache

/* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */
struct pci_dev;
extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
struct pci_dev;

static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) { }


Randy Dunlap16100.00%1100.00%

#endif #include <asm-generic/pci_iomap.h> #endif

Overall Contributors

Linus Torvalds22959.95%216.67%
James Bottomley5113.35%216.67%
Horia Geantă5013.09%18.33%
Randy Dunlap194.97%18.33%
Venkatesh Pallipadi92.36%18.33%
Jonas Bonn92.36%18.33%
Toshi Kani92.36%18.33%
Michael S. Tsirkin41.05%18.33%
David S. Miller10.26%18.33%
Uwe Kleine-König10.26%18.33%
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