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/** @file
I/O Library. This file has compiler specifics for ICC as there
is no ANSI C standard for doing IO.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "BaseIoLibIntrinsicInternal.h"
/**
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().
If Port is not aligned on a 16-bit boundary, 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().
If Port is not aligned on a 16-bit boundary, 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
}
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().
If Port is not aligned on a 32-bit boundary, 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().
If Port is not aligned on a 32-bit boundary, 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;
}
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