acrn-hypervisor/hypervisor/include/arch/x86/asm/io.h

170 lines
3.8 KiB
C

/*
* Copyright (C) 2018 Intel Corporation.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef IO_H
#define IO_H
#include <types.h>
/* Write 1 byte to specified I/O port */
static inline void pio_write8(uint8_t value, uint16_t port)
{
asm volatile ("outb %0,%1"::"a" (value), "dN"(port));
}
/* Read 1 byte from specified I/O port */
static inline uint8_t pio_read8(uint16_t port)
{
uint8_t value;
asm volatile ("inb %1,%0":"=a" (value):"dN"(port));
return value;
}
/* Write 2 bytes to specified I/O port */
static inline void pio_write16(uint16_t value, uint16_t port)
{
asm volatile ("outw %0,%1"::"a" (value), "dN"(port));
}
/* Read 2 bytes from specified I/O port */
static inline uint16_t pio_read16(uint16_t port)
{
uint16_t value;
asm volatile ("inw %1,%0":"=a" (value):"dN"(port));
return value;
}
/* Write 4 bytes to specified I/O port */
static inline void pio_write32(uint32_t value, uint16_t port)
{
asm volatile ("outl %0,%1"::"a" (value), "dN"(port));
}
/* Read 4 bytes from specified I/O port */
static inline uint32_t pio_read32(uint16_t port)
{
uint32_t value;
asm volatile ("inl %1,%0":"=a" (value):"dN"(port));
return value;
}
static inline void pio_write(uint32_t v, uint16_t addr, size_t sz)
{
if (sz == 1U) {
pio_write8((uint8_t)v, addr);
} else if (sz == 2U) {
pio_write16((uint16_t)v, addr);
} else {
pio_write32(v, addr);
}
}
static inline uint32_t pio_read(uint16_t addr, size_t sz)
{
uint32_t ret;
if (sz == 1U) {
ret = pio_read8(addr);
} else if (sz == 2U) {
ret = pio_read16(addr);
} else {
ret = pio_read32(addr);
}
return ret;
}
/** Writes a 64 bit value to a memory mapped IO device.
*
* @param value The 64 bit value to write.
* @param addr The memory address to write to.
*/
static inline void mmio_write64(uint64_t value, void *addr)
{
volatile uint64_t *addr64 = (volatile uint64_t *)addr;
*addr64 = value;
}
/** Writes a 32 bit value to a memory mapped IO device.
*
* @param value The 32 bit value to write.
* @param addr The memory address to write to.
*/
static inline void mmio_write32(uint32_t value, void *addr)
{
volatile uint32_t *addr32 = (volatile uint32_t *)addr;
*addr32 = value;
}
/** Writes a 16 bit value to a memory mapped IO device.
*
* @param value The 16 bit value to write.
* @param addr The memory address to write to.
*/
static inline void mmio_write16(uint16_t value, void *addr)
{
volatile uint16_t *addr16 = (volatile uint16_t *)addr;
*addr16 = value;
}
/** Writes an 8 bit value to a memory mapped IO device.
*
* @param value The 8 bit value to write.
* @param addr The memory address to write to.
*/
static inline void mmio_write8(uint8_t value, void *addr)
{
volatile uint8_t *addr8 = (volatile uint8_t *)addr;
*addr8 = value;
}
/** Reads a 64 bit value from a memory mapped IO device.
*
* @param addr The memory address to read from.
*
* @return The 64 bit value read from the given address.
*/
static inline uint64_t mmio_read64(const void *addr)
{
return *((volatile const uint64_t *)addr);
}
/** Reads a 32 bit value from a memory mapped IO device.
*
* @param addr The memory address to read from.
*
* @return The 32 bit value read from the given address.
*/
static inline uint32_t mmio_read32(const void *addr)
{
return *((volatile const uint32_t *)addr);
}
/** Reads a 16 bit value from a memory mapped IO device.
*
* @param addr The memory address to read from.
*
* @return The 16 bit value read from the given address.
*/
static inline uint16_t mmio_read16(const void *addr)
{
return *((volatile const uint16_t *)addr);
}
/** Reads an 8 bit value from a memory mapped IO device.
*
* @param addr The memory address to read from.
*
* @return The 8 bit value read from the given address.
*/
static inline uint8_t mmio_read8(const void *addr)
{
return *((volatile const uint8_t *)addr);
}
#endif /* _IO_H defined */