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/*
* Mostly stolen from the linux kernel
*/
/**
* @file
* @brief x86 IO access functions
*/
#ifndef __ASM_X86_IO_H
#define __ASM_X86_IO_H
#include <asm/byteorder.h>
#define IO_SPACE_LIMIT 0xffff
static inline void outb(unsigned char value, int port)
{
asm volatile("outb %b0, %w1" : : "a"(value), "Nd"(port));
}
static inline void outw(unsigned short value, int port)
{
asm volatile("outw %w0, %w1" : : "a"(value), "Nd"(port));
}
static inline void outl(unsigned long value, int port)
{
asm volatile("outl %0, %w1" : : "a"(value), "Nd"(port));
}
static inline unsigned char inb(int port)
{
unsigned char value;
asm volatile("inb %w1, %b0" : "=a"(value) : "Nd"(port));
return value;
}
static inline unsigned short inw(int port)
{
unsigned short value;
asm volatile("inw %w1, %w0" : "=a"(value) : "Nd"(port));
return value;
}
static inline unsigned long inl(int port)
{
unsigned long value;
asm volatile("inl %w1, %0" : "=a"(value) : "Nd"(port));
return value;
}
#define build_mmio_read(name, size, type, reg, barrier) \
static inline type name(const volatile void *addr) \
{ type ret; asm volatile("mov" size " %1,%0":reg (ret) \
:"m" (*(volatile type*)addr) barrier); return ret; }
build_mmio_read(readb, "b", unsigned char, "=q", :"memory")
build_mmio_read(readw, "w", unsigned short, "=r", :"memory")
build_mmio_read(readl, "l", unsigned int, "=r", :"memory")
#define build_mmio_write(name, size, type, reg, barrier) \
static inline void name(type val, volatile void *addr) \
{ asm volatile("mov" size " %0,%1": :reg (val), \
"m" (*(volatile type*)addr) barrier); }
build_mmio_write(writeb, "b", unsigned char, "q", :"memory")
build_mmio_write(writew, "w", unsigned short, "r", :"memory")
build_mmio_write(writel, "l", unsigned int, "r", :"memory")
/* do a tiny io delay */
static inline void io_delay(void)
{
inb(0x80);
}
#endif /* __ASM_X86_IO_H */
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