text: /** @file
    I/O Library. This file has compiler specifics for ICC as there
    is no ANSI C standard for doing IO.
  
    Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>
    This program and the accompanying materials are
    licensed and made available under the terms and conditions of the BSD License
    which accompanies this distribution.  The full text of the license may be found at
    http://opensource.org/licenses/bsd-license.php
  
    THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
    WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  
  **/
  #include "BaseIoLibIntrinsicInternal.h"
  
  /**
    Reads an 8-bit MMIO register.
  
    Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
    returned. This function must guarantee that all MMIO read and write
    operations are serialized.
  
    If 8-bit MMIO register operations are not supported, then ASSERT().
  
    @param  Address The MMIO register to read.
  
    @return The value read.
  
  **/
  UINT8
  EFIAPI
  MmioRead8 (
    IN      UINTN                     Address
    )
  {
    return *(volatile UINT8*)Address;
  }
  
  /**
    Writes an 8-bit MMIO register.
  
    Writes the 8-bit MMIO register specified by Address with the value specified
    by Value and returns Value. This function must guarantee that all MMIO read
    and write operations are serialized.
  
    If 8-bit MMIO register operations are not supported, then ASSERT().
  
    @param  Address The MMIO register to write.
    @param  Value   The value to write to the MMIO register.
  
  **/
  UINT8
  EFIAPI
  MmioWrite8 (
    IN      UINTN                     Address,
    IN      UINT8                     Value
    )
  {
    return *(volatile UINT8*)Address = Value;
  }
  
  /**
    Reads a 16-bit MMIO register.
  
    Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
    returned. This function must guarantee that all MMIO read and write
    operations are serialized.
  
    If 16-bit MMIO register operations are not supported, then ASSERT().
  
    @param  Address The MMIO register to read.
  
    @return The value read.
  
  **/
  UINT16
  EFIAPI
  MmioRead16 (
    IN      UINTN                     Address
    )
  {
    ASSERT ((Address & 1) == 0);
    return *(volatile UINT16*)Address;
  }
  
  /**
    Writes a 16-bit MMIO register.
  
    Writes the 16-bit MMIO register specified by Address with the value specified
    by Value and returns Value. This function must guarantee that all MMIO read
    and write operations are serialized.
  
    If 16-bit MMIO register operations are not supported, then ASSERT().
  
    @param  Address The MMIO register to write.
    @param  Value   The value to write to the MMIO register.
  
  **/
  UINT16
  EFIAPI
  MmioWrite16 (
    IN      UINTN                     Address,
    IN      UINT16                    Value
    )
  {
    ASSERT ((Address & 1) == 0);
    return *(volatile UINT16*)Address = Value;
  }
  
  /**
    Reads a 32-bit MMIO register.
  
    Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
    returned. This function must guarantee that all MMIO read and write
    operations are serialized.
  
    If 32-bit MMIO register operations are not supported, then ASSERT().
  
    @param  Address The MMIO register to read.
  
    @return The value read.
  
  **/
  UINT32
  EFIAPI
  MmioRead32 (
    IN      UINTN                     Address
    )
  {
    ASSERT ((Address & 3) == 0);
    return *(volatile UINT32*)Address;
  }
  
  /**
    Writes a 32-bit MMIO register.
  
    Writes the 32-bit MMIO register specified by Address with the value specified
    by Value and returns Value. This function must guarantee that all MMIO read
    and write operations are serialized.
  
    If 32-bit MMIO register operations are not supported, then ASSERT().
  
    @param  Address The MMIO register to write.
    @param  Value   The value to write to the MMIO register.
  
  **/
  UINT32
  EFIAPI
  MmioWrite32 (
    IN      UINTN                     Address,
    IN      UINT32                    Value
    )
  {
    ASSERT ((Address & 3) == 0);
    return *(volatile UINT32*)Address = Value;
  }
  
  /**
    Reads a 64-bit MMIO register.
  
    Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
    returned. This function must guarantee that all MMIO read and write
    operations are serialized.
  
    If 64-bit MMIO register operations are not supported, then ASSERT().
  
    @param  Address The MMIO register to read.
  
    @return The value read.
  
  **/
  UINT64
  EFIAPI
  MmioRead64 (
    IN      UINTN                     Address
    )
  {
    ASSERT ((Address & 7) == 0);
    return *(volatile UINT64*)Address;
  }
  
  /**
    Writes a 64-bit MMIO register.
  
    Writes the 64-bit MMIO register specified by Address with the value specified
    by Value and returns Value. This function must guarantee that all MMIO read
    and write operations are serialized.
  
    If 64-bit MMIO register operations are not supported, then ASSERT().
  
    @param  Address The MMIO register to write.
    @param  Value   The value to write to the MMIO register.
  
  **/
  UINT64
  EFIAPI
  MmioWrite64 (
    IN      UINTN                     Address,
    IN      UINT64                    Value
    )
  {
    ASSERT ((Address & 7) == 0);
    return *(volatile UINT64*)Address = Value;
  }
  
  
  
  /**
    Reads an 8-bit I/O port.
  
    Reads the 8-bit I/O port specified by Port. The 8-bit read value is returned.
    This function must guarantee that all I/O read and write operations are
    serialized.
  
    If 8-bit I/O port operations are not supported, then ASSERT().
  
    @param  Port  The I/O port to read.
  
    @return The value read.
  
  **/
  UINT8
  EFIAPI
  IoRead8 (
    IN      UINTN                     Port
    )
  {
    UINT8   Data;
  
    __asm {
      mov dx, word ptr [Port]
      in  al, dx
  
      mov Data, al
    }
    return Data;
  }
  
  /**
    Writes an 8-bit I/O port.
  
    Writes the 8-bit I/O port specified by Port with the value specified by Value
    and returns Value. This function must guarantee that all I/O read and write
    operations are serialized.
  
    If 8-bit I/O port operations are not supported, then ASSERT().
  
    @param  Port  The I/O port to write.
    @param  Value The value to write to the I/O port.
  
    @return The value written the I/O port.
  
  **/
  UINT8
  EFIAPI
  IoWrite8 (
    IN      UINTN                     Port,
    IN      UINT8                     Value
    )
  {
    __asm {
      mov al, byte ptr [Value]
      mov dx, word ptr [Port]
      out dx, al
    }
    return Value; 
  }
  
  /**
    Reads a 16-bit I/O port.
  
    Reads the 16-bit I/O port specified by Port. The 16-bit read value is returned.
    This function must guarantee that all I/O read and write operations are
    serialized.
  
    If 16-bit I/O port operations are not supported, then ASSERT().
  
    @param  Port  The I/O port to read.
  
    @return The value read.
  
  **/
  UINT16
  EFIAPI
  IoRead16 (
    IN      UINTN                     Port
    )
  {
    UINT16  Data;
  
    ASSERT ((Port & 1) == 0);
  
    __asm {
      mov dx, word ptr [Port]
      in  ax, dx
      mov word ptr [Data], ax
    }
  
    return Data;
  }
  
  /**
    Writes a 16-bit I/O port.
  
    Writes the 16-bit I/O port specified by Port with the value specified by Value
    and returns Value. This function must guarantee that all I/O read and write
    operations are serialized.
  
    If 16-bit I/O port operations are not supported, then ASSERT().
  
    @param  Port  The I/O port to write.
    @param  Value The value to write to the I/O port.
  
    @return The value written the I/O port.
  
  **/
  UINT16
  EFIAPI
  IoWrite16 (
    IN      UINTN                     Port,
    IN      UINT16                    Value
    )
  {
    ASSERT ((Port & 1) == 0);
  
    __asm {
      mov ax, word ptr [Value]
      mov dx, word ptr [Port]
      out dx, ax
    }
  
    //
    // Never reached return statement.
    //
    return Value;
  }
  
  /**
    Reads a 32-bit I/O port.
  
    Reads the 32-bit I/O port specified by Port. The 32-bit read value is returned.
    This function must guarantee that all I/O read and write operations are
    serialized.
  
    If 32-bit I/O port operations are not supported, then ASSERT().
  
    @param  Port  The I/O port to read.
  
    @return The value read.
  
  **/
  UINT32
  EFIAPI
  IoRead32 (
    IN      UINTN                     Port
    )
  {
    UINT32 Data;
  
    ASSERT ((Port & 3) == 0);
  
    __asm {
      mov dx, word ptr [Port]
      in  eax, dx
      mov dword ptr [Data], eax
    }
    
    return Data;
  }
  
  /**
    Writes a 32-bit I/O port.
  
    Writes the 32-bit I/O port specified by Port with the value specified by Value
    and returns Value. This function must guarantee that all I/O read and write
    operations are serialized.
  
    If 32-bit I/O port operations are not supported, then ASSERT().
  
    @param  Port  The I/O port to write.
    @param  Value The value to write to the I/O port.
  
    @return The value written the I/O port.
  
  **/
  UINT32
  EFIAPI
  IoWrite32 (
    IN      UINTN   Port,
    IN      UINT32  Value
    )
  {
    ASSERT ((Port & 3) == 0);
    
    __asm {
      mov eax, dword ptr [Value]
      mov dx, word ptr [Port]
      out dx, eax
    }
  
    return Value;
  }
  
  