sys_io.h

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/*
 * Copyright (c) 2015, Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
/* Implementation of sys_io.h's documented functions */
 
#ifndef ZEPHYR_INCLUDE_ARCH_X86_IA32_SYS_IO_H_
#define ZEPHYR_INCLUDE_ARCH_X86_IA32_SYS_IO_H_
 
#if !defined(_ASMLANGUAGE)
 
#include <zephyr/sys/sys_io.h>
#include <zephyr/types.h>
#include <stddef.h>
 
static ALWAYS_INLINE
 void sys_io_set_bit(io_port_t port, unsigned int bit)
{
 uint32_t reg = 0;
 
 __asm__ volatile("inl %w1, %0;\n\t"
 "btsl %2, %0;\n\t"
 "outl %0, %w1;\n\t"
 :
 : "a" (reg), "Nd" (port), "Ir" (bit));
}
 
static ALWAYS_INLINE
 void sys_io_clear_bit(io_port_t port, unsigned int bit)
{
 uint32_t reg = 0;
 
 __asm__ volatile("inl %w1, %0;\n\t"
 "btrl %2, %0;\n\t"
 "outl %0, %w1;\n\t"
 :
 : "a" (reg), "Nd" (port), "Ir" (bit));
}
 
static ALWAYS_INLINE
 int sys_io_test_bit(io_port_t port, unsigned int bit)
{
 uint32_t ret;
 
 __asm__ volatile("inl %w1, %0\n\t"
 "btl %2, %0\n\t"
 : "=a" (ret)
 : "Nd" (port), "Ir" (bit));
 
 return (ret & 1U);
}
 
static ALWAYS_INLINE
 int sys_io_test_and_set_bit(io_port_t port, unsigned int bit)
{
 int ret;
 
 ret = sys_io_test_bit(port, bit);
 sys_io_set_bit(port, bit);
 
 return ret;
}
 
static ALWAYS_INLINE
 int sys_io_test_and_clear_bit(io_port_t port, unsigned int bit)
{
 int ret;
 
 ret = sys_io_test_bit(port, bit);
 sys_io_clear_bit(port, bit);
 
 return ret;
}
 
#endif /* _ASMLANGUAGE */
 
#endif /* ZEPHYR_INCLUDE_ARCH_X86_IA32_SYS_IO_H_ */