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#ifndef ARCH_I386_IO_H
#define ARCH_I386_IO_H
#include <stdint.h>
/* Helper functions for directly doing I/O */
static inline __attribute__((__always_inline__))
uint8_t inb(uint16_t port)
{
uint8_t result;
__asm__ __volatile__ (
"inb %w1,%0"
:"=a" (result)
:"Nd" (port));
return result;
}
static inline __attribute__((__always_inline__))
uint16_t inw(uint16_t port)
{
uint16_t result;
__asm__ __volatile__ (
"inw %w1,%0"
:"=a" (result)
:"Nd" (port));
return result;
}
static inline __attribute__((__always_inline__))
uint32_t inl(uint32_t port)
{
uint32_t result;
__asm__ __volatile__ (
"inl %w1,%0"
:"=a" (result)
:"Nd" (port));
return result;
}
static inline __attribute__((__always_inline__))
void outb (uint8_t value, uint16_t port)
{
__asm__ __volatile__ (
"outb %b0,%w1"
:
:"a" (value), "Nd" (port));
}
static inline __attribute__((__always_inline__))
void outw (uint16_t value, uint16_t port)
{
__asm__ __volatile__ (
"outw %w0,%w1"
:
:"a" (value), "Nd" (port));
}
static inline __attribute__((__always_inline__))
void outl (uint32_t value, uint16_t port)
{
__asm__ __volatile__ (
"outl %0,%w1"
:
:"a" (value), "Nd" (port));
}
/*
* readX/writeX() are used to access memory mapped devices. On some
* architectures the memory mapped IO stuff needs to be accessed
* differently. On the x86 architecture, we just read/write the
* memory location directly.
*/
static inline __attribute__((__always_inline__))
unsigned char readb(const volatile void *addr)
{
return *(volatile unsigned char *) addr;
}
static inline __attribute__((__always_inline__))
unsigned short readw(const volatile void *addr)
{
return *(volatile unsigned short *) addr;
}
static inline __attribute__((__always_inline__))
unsigned int readl(const volatile void *addr)
{
return *(volatile unsigned int *) addr;
}
static inline __attribute__((__always_inline__))
void writeb(unsigned char b, volatile void *addr)
{
*(volatile unsigned char *) addr = b;
}
static inline __attribute__((__always_inline__))
void writew(unsigned short b, volatile void *addr)
{
*(volatile unsigned short *) addr = b;
}
static inline __attribute__((__always_inline__))
void writel(unsigned int b, volatile void *addr)
{
*(volatile unsigned int *) addr = b;
}
#endif /* ARCH_I386_IO_H */
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