cregit-Linux how code gets into the kernel

Release 4.16 lib/iomap.c

Directory: lib
// SPDX-License-Identifier: GPL-2.0
/*
 * Implement the default iomap interfaces
 *
 * (C) Copyright 2004 Linus Torvalds
 */
#include <linux/pci.h>
#include <linux/io.h>

#include <linux/export.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 don't assume any hardware mappings, and just
 * encode the PIO/MMIO as part of the cookie. They 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 and should do their own copy.
 */

#ifndef HAVE_ARCH_PIO_SIZE
/*
 * We encode the physical PIO addresses (0-0xffff) into the
 * pointer by offsetting them with a constant (0x10000) and
 * assuming that all the low addresses are always PIO. That means
 * we can do some sanity checks on the low bits, and don't
 * need to just take things for granted.
 */

#define PIO_OFFSET	0x10000UL

#define PIO_MASK	0x0ffffUL

#define PIO_RESERVED	0x40000UL
#endif


static void bad_io_access(unsigned long port, const char *access) { static int count = 10; if (count) { count--; WARN(1, KERN_ERR "Bad IO access at port %#lx (%s)\n", port, access); } }

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Arjan van de Ven37.14%125.00%
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/* * Ugly macros are a way of life. */ #define IO_COND(addr, is_pio, is_mmio) do { \ unsigned long port = (unsigned long __force)addr; \ if (port >= PIO_RESERVED) { \ is_mmio; \ } else if (port > PIO_OFFSET) { \ port &= PIO_MASK; \ is_pio; \ } else \ bad_io_access(port, #is_pio ); \ } while (0) #ifndef pio_read16be #define pio_read16be(port) swab16(inw(port)) #define pio_read32be(port) swab32(inl(port)) #endif #ifndef mmio_read16be #define mmio_read16be(addr) be16_to_cpu(__raw_readw(addr)) #define mmio_read32be(addr) be32_to_cpu(__raw_readl(addr)) #endif
unsigned int ioread8(void __iomem *addr) { IO_COND(addr, return inb(port), return readb(addr)); return 0xff; }

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unsigned int ioread16(void __iomem *addr) { IO_COND(addr, return inw(port), return readw(addr)); return 0xffff; }

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unsigned int ioread16be(void __iomem *addr) { IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr)); return 0xffff; }

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unsigned int ioread32(void __iomem *addr) { IO_COND(addr, return inl(port), return readl(addr)); return 0xffffffff; }

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unsigned int ioread32be(void __iomem *addr) { IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr)); return 0xffffffff; }

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EXPORT_SYMBOL(ioread8); EXPORT_SYMBOL(ioread16); EXPORT_SYMBOL(ioread16be); EXPORT_SYMBOL(ioread32); EXPORT_SYMBOL(ioread32be); #ifndef pio_write16be #define pio_write16be(val,port) outw(swab16(val),port) #define pio_write32be(val,port) outl(swab32(val),port) #endif #ifndef mmio_write16be #define mmio_write16be(val,port) __raw_writew(be16_to_cpu(val),port) #define mmio_write32be(val,port) __raw_writel(be32_to_cpu(val),port) #endif
void iowrite8(u8 val, void __iomem *addr) { IO_COND(addr, outb(val,port), writeb(val, addr)); }

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void iowrite16(u16 val, void __iomem *addr) { IO_COND(addr, outw(val,port), writew(val, addr)); }

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void iowrite16be(u16 val, void __iomem *addr) { IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr)); }

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void iowrite32(u32 val, void __iomem *addr) { IO_COND(addr, outl(val,port), writel(val, addr)); }

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void iowrite32be(u32 val, void __iomem *addr) { IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr)); }

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EXPORT_SYMBOL(iowrite8); EXPORT_SYMBOL(iowrite16); EXPORT_SYMBOL(iowrite16be); EXPORT_SYMBOL(iowrite32); EXPORT_SYMBOL(iowrite32be); /* * These are the "repeat MMIO read/write" functions. * Note the "__raw" accesses, since we don't want to * convert to CPU byte order. We write in "IO byte * order" (we also don't have IO barriers). */ #ifndef mmio_insb
static inline void mmio_insb(void __iomem *addr, u8 *dst, int count) { while (--count >= 0) { u8 data = __raw_readb(addr); *dst = data; dst++; } }

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static inline void mmio_insw(void __iomem *addr, u16 *dst, int count) { while (--count >= 0) { u16 data = __raw_readw(addr); *dst = data; dst++; } }

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static inline void mmio_insl(void __iomem *addr, u32 *dst, int count) { while (--count >= 0) { u32 data = __raw_readl(addr); *dst = data; dst++; } }

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#endif #ifndef mmio_outsb
static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count) { while (--count >= 0) { __raw_writeb(*src, addr); src++; } }

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static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count) { while (--count >= 0) { __raw_writew(*src, addr); src++; } }

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static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count) { while (--count >= 0) { __raw_writel(*src, addr); src++; } }

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#endif
void ioread8_rep(void __iomem *addr, void *dst, unsigned long count) { IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count)); }

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void ioread16_rep(void __iomem *addr, void *dst, unsigned long count) { IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count)); }

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void ioread32_rep(void __iomem *addr, void *dst, unsigned long count) { IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count)); }

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EXPORT_SYMBOL(ioread8_rep); EXPORT_SYMBOL(ioread16_rep); EXPORT_SYMBOL(ioread32_rep);
void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count) { IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count)); }

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void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count) { IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count)); }

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void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count) { IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count)); }

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EXPORT_SYMBOL(iowrite8_rep); EXPORT_SYMBOL(iowrite16_rep); EXPORT_SYMBOL(iowrite32_rep); #ifdef CONFIG_HAS_IOPORT_MAP /* Create a virtual mapping cookie for an IO port range */
void __iomem *ioport_map(unsigned long port, unsigned int nr) { if (port > PIO_MASK) return NULL; return (void __iomem *) (unsigned long) (port + PIO_OFFSET); }

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void ioport_unmap(void __iomem *addr) { /* Nothing to do */ }

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EXPORT_SYMBOL(ioport_map); EXPORT_SYMBOL(ioport_unmap); #endif /* CONFIG_HAS_IOPORT_MAP */ #ifdef CONFIG_PCI /* Hide the details if this is a MMIO or PIO address space and just do what * you expect in the correct way. */
void pci_iounmap(struct pci_dev *dev, void __iomem * addr) { IO_COND(addr, /* nothing */, iounmap(addr)); }

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EXPORT_SYMBOL(pci_iounmap); #endif /* CONFIG_PCI */

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Linus Torvalds99587.13%635.29%
James Bottomley11610.16%15.88%
Jonas Bonn100.88%15.88%
Björn Helgaas70.61%15.88%
David S. Miller40.35%15.88%
Arjan van de Ven30.26%15.88%
Uwe Kleine-König20.18%15.88%
René Herman10.09%15.88%
Michael S. Tsirkin10.09%15.88%
Paul Gortmaker10.09%15.88%
Greg Kroah-Hartman10.09%15.88%
Tejun Heo10.09%15.88%
Total1142100.00%17100.00%
Directory: lib
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