diff options
Diffstat (limited to 'roms/edk2/MdePkg/Library/BaseIoLibIntrinsic/IoLibGcc.c')
| -rw-r--r-- | roms/edk2/MdePkg/Library/BaseIoLibIntrinsic/IoLibGcc.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseIoLibIntrinsic/IoLibGcc.c b/roms/edk2/MdePkg/Library/BaseIoLibIntrinsic/IoLibGcc.c new file mode 100644 index 000000000..b3a1a2025 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseIoLibIntrinsic/IoLibGcc.c @@ -0,0 +1,184 @@ +/** @file
+ I/O Library. This file has compiler specifics for GCC as there is no
+ ANSI C standard for doing IO.
+
+ GCC - uses EFIAPI assembler. __asm__ calls GAS. __volatile__ makes sure the
+ compiler puts the assembler in this exact location. The complex GNUC
+ operations are not optimzed. It would be possible to also write these
+ with EFIAPI assembler.
+
+ We don't advocate putting compiler specifics in libraries or drivers but there
+ is no other way to make this work.
+
+ 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__ __volatile__ ("inb %w1,%b0" : "=a" (Data) : "d" ((UINT16)Port));
+ 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__ __volatile__ ("outb %b0,%w1" : : "a" (Value), "d" ((UINT16)Port));
+ 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__ __volatile__ ("inw %w1,%w0" : "=a" (Data) : "d" ((UINT16)Port));
+ 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__ __volatile__ ("outw %w0,%w1" : : "a" (Value), "d" ((UINT16)Port));
+ 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__ __volatile__ ("inl %w1,%0" : "=a" (Data) : "d" ((UINT16)Port));
+ 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__ __volatile__ ("outl %0,%w1" : : "a" (Value), "d" ((UINT16)Port));
+ return Value;
+}
+
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