arch/arc/include/asm/io.h

Source file repositories/reference/linux-study-clean/arch/arc/include/asm/io.h

File Facts

System
Linux kernel
Corpus path
arch/arc/include/asm/io.h
Extension
.h
Size
6109 bytes
Lines
232
Domain
Architecture Layer
Bucket
arch/arc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_ARC_IO_H
#define _ASM_ARC_IO_H

#include <linux/types.h>
#include <asm/byteorder.h>
#include <asm/page.h>
#include <linux/unaligned.h>

#ifdef CONFIG_ISA_ARCV2
#include <asm/barrier.h>
#define __iormb()		rmb()
#define __iowmb()		wmb()
#else
#define __iormb()		do { } while (0)
#define __iowmb()		do { } while (0)
#endif

extern void __iomem *ioremap(phys_addr_t paddr, unsigned long size);
#define ioremap ioremap
#define ioremap_prot ioremap_prot
#define iounmap iounmap
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
	return (void __iomem *)port;
}

static inline void ioport_unmap(void __iomem *addr)
{
}

/*
 * io{read,write}{16,32}be() macros
 */
#define ioread16be(p)		({ u16 __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(); __v; })
#define ioread32be(p)		({ u32 __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(); __v; })

#define iowrite16be(v,p)	({ __iowmb(); __raw_writew((__force u16)cpu_to_be16(v), p); })
#define iowrite32be(v,p)	({ __iowmb(); __raw_writel((__force u32)cpu_to_be32(v), p); })

#define __raw_readb __raw_readb
static inline u8 __raw_readb(const volatile void __iomem *addr)
{
	u8 b;

	__asm__ __volatile__(
	"	ldb%U1 %0, %1	\n"
	: "=r" (b)
	: "m" (*(volatile u8 __force *)addr)
	: "memory");

	return b;
}

#define __raw_readw __raw_readw
static inline u16 __raw_readw(const volatile void __iomem *addr)
{
	u16 s;

	__asm__ __volatile__(
	"	ldw%U1 %0, %1	\n"
	: "=r" (s)
	: "m" (*(volatile u16 __force *)addr)
	: "memory");

	return s;
}

#define __raw_readl __raw_readl
static inline u32 __raw_readl(const volatile void __iomem *addr)
{
	u32 w;

	__asm__ __volatile__(
	"	ld%U1 %0, %1	\n"
	: "=r" (w)
	: "m" (*(volatile u32 __force *)addr)
	: "memory");

	return w;
}

/*
 * {read,write}s{b,w,l}() repeatedly access the same IO address in
 * native endianness in 8-, 16-, 32-bit chunks {into,from} memory,
 * @count times
 */
#define __raw_readsx(t,f) \
static inline void __raw_reads##f(const volatile void __iomem *addr,	\
				  void *ptr, unsigned int count)	\
{									\

Annotation

Implementation Notes