text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  
  #include <AK/Types.h>
  
  namespace IO {
  
  inline u8 in8(u16 port)
  {
      u8 value;
      asm volatile("inb %1, %0"
                   : "=a"(value)
                   : "Nd"(port));
      return value;
  }
  
  inline u16 in16(u16 port)
  {
      u16 value;
      asm volatile("inw %1, %0"
                   : "=a"(value)
                   : "Nd"(port));
      return value;
  }
  
  inline u32 in32(u16 port)
  {
      u32 value;
      asm volatile("inl %1, %0"
                   : "=a"(value)
                   : "Nd"(port));
      return value;
  }
  
  inline void repeated_in16(u16 port, u8* buffer, int buffer_size)
  {
      asm volatile("rep insw"
                   : "+D"(buffer), "+c"(buffer_size)
                   : "d"(port)
                   : "memory");
  }
  
  inline void out8(u16 port, u8 value)
  {
      asm volatile("outb %0, %1" ::"a"(value), "Nd"(port));
  }
  
  inline void out16(u16 port, u16 value)
  {
      asm volatile("outw %0, %1" ::"a"(value), "Nd"(port));
  }
  
  inline void out32(u16 port, u32 value)
  {
      asm volatile("outl %0, %1" ::"a"(value), "Nd"(port));
  }
  
  inline void repeated_out16(u16 port, const u8* data, int data_size)
  {
      asm volatile("rep outsw"
                   : "+S"(data), "+c"(data_size)
                   : "d"(port));
  }
  
  inline void delay()
  {
      // ~3 microsecs
      for (auto i = 0; i < 32; i++) {
          IO::in8(0x80);
      }
  }
  
  }
  