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Date: Fri, 27 Sep 2019 00:39:28 +0100
From: "Leif Lindholm" <leif.lindholm@linaro.org>
To: devel@edk2.groups.io, abner.chang@hpe.com
Subject: Re: [edk2-devel] [edk2-staging/RISC-V-V2 PATCH v2 09/29] MdePkg/BaseIoLibIntrinsic: RISC-V I/O intrinsic functions.
Message-ID: <20190926233928.GL25504@bivouac.eciton.net>
References: <1569198715-31552-1-git-send-email-abner.chang@hpe.com>
 <1569198715-31552-11-git-send-email-abner.chang@hpe.com>
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On Mon, Sep 23, 2019 at 08:31:35AM +0800, Abner Chang wrote:
> RISC-V MMIO library instance.  RISC-V only supports memory map I/O.

We need fewer, not more, C implementations of MMIO accessors.
While this set doesn't need to wait for upstream to get sorted, please
just use IoLibArm.c which should be completely equivalent to what you
have implemented here.

/
    Leif

> Signed-off-by: Abner Chang <abner.chang@hpe.com>
> ---
>  .../BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf      |   8 +-
>  MdePkg/Library/BaseIoLibIntrinsic/IoLibRiscV.c     | 601 +++++++++++++++++++++
>  2 files changed, 607 insertions(+), 2 deletions(-)
>  create mode 100644 MdePkg/Library/BaseIoLibIntrinsic/IoLibRiscV.c
> 
> diff --git a/MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf b/MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
> index 457cce9..fbb568e 100644
> --- a/MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
> +++ b/MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
> @@ -2,13 +2,14 @@
>  #  Instance of I/O Library using compiler intrinsics.
>  #
>  #  I/O Library that uses compiler intrinsics to perform IN and OUT instructions
> -#  for IA-32 and x64.  On IPF, I/O port requests are translated into MMIO requests.
> +#  for IA-32, x64 and RISC-V.  On IPF, I/O port requests are translated into MMIO requests.
>  #  MMIO requests are forwarded directly to memory.  For EBC, I/O port requests
>  #  ASSERT().
>  #
>  #  Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
>  #  Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
>  #  Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
> +#  Portinos Copyright (c) 2016, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
>  #
>  #  SPDX-License-Identifier: BSD-2-Clause-Patent
>  #
> @@ -25,7 +26,7 @@
>  
>  
>  #
> -#  VALID_ARCHITECTURES           = IA32 X64 EBC ARM AARCH64
> +#  VALID_ARCHITECTURES           = IA32 X64 EBC ARM AARCH64 RISCV64
>  #
>  
>  [Sources]
> @@ -55,6 +56,9 @@
>  [Sources.AARCH64]
>    IoLibArm.c
>  
> +[Sources.RISCV64]
> +  IoLibRiscV.c
> +
>  [Packages]
>    MdePkg/MdePkg.dec
>  
> diff --git a/MdePkg/Library/BaseIoLibIntrinsic/IoLibRiscV.c b/MdePkg/Library/BaseIoLibIntrinsic/IoLibRiscV.c
> new file mode 100644
> index 0000000..789928b
> --- /dev/null
> +++ b/MdePkg/Library/BaseIoLibIntrinsic/IoLibRiscV.c
> @@ -0,0 +1,601 @@
> +/** @file
> +  Common I/O Library routines for RISC-V
> +
> +  Copyright (c) 2016 - 2019, Hewlett Packard Enterprise Development LP. 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.
> +
> +  @return Value.
> +
> +**/
> +UINT8
> +EFIAPI
> +MmioWrite8 (
> +  IN      UINTN                     Address,
> +  IN      UINT8                     Value
> +  )
> +{
> +  *(volatile UINT8 *)Address = Value;
> +  return 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().
> +  If Address is not aligned on a 16-bit boundary, then ASSERT().
> +
> +  @param  Address The MMIO register to read.
> +
> +  @return The value read.
> +
> +**/
> +UINT16
> +EFIAPI
> +MmioRead16 (
> +  IN      UINTN                     Address
> +  )
> +{
> +  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().
> +  If Address is not aligned on a 16-bit boundary, then ASSERT().
> +
> +  @param  Address The MMIO register to write.
> +  @param  Value   The value to write to the MMIO register.
> +
> +  @return Value.
> +
> +**/
> +UINT16
> +EFIAPI
> +MmioWrite16 (
> +  IN      UINTN                     Address,
> +  IN      UINT16                    Value
> +  )
> +{
> +  *(volatile UINT16 *)Address = Value;
> +  return 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().
> +  If Address is not aligned on a 32-bit boundary, then ASSERT().
> +
> +  @param  Address The MMIO register to read.
> +
> +  @return The value read.
> +
> +**/
> +UINT32
> +EFIAPI
> +MmioRead32 (
> +  IN      UINTN                     Address
> +  )
> +{
> +  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().
> +  If Address is not aligned on a 32-bit boundary, then ASSERT().
> +
> +  @param  Address The MMIO register to write.
> +  @param  Value   The valu  return *(volatile UINT8*)Address;
> +                  to write to the MMIO register.
> +
> +  @return Value.
> +
> +**/
> +UINT32
> +EFIAPI
> +MmioWrite32 (
> +  IN      UINTN                     Address,
> +  IN      UINT32                    Value
> +  )
> +{
> +  *(volatile UINT32 *)Address = Value;
> +  return 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().
> +  If Address is not aligned on a 64-bit boundary, then ASSERT().
> +
> +  @param  Address The MMIO register to read.
> +
> +  @return The value read.
> +
> +**/
> +UINT64
> +EFIAPI
> +MmioRead64 (
> +  IN      UINTN                     Address
> +  )
> +{
> +  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().
> +  If Address is not aligned on a 64-bit boundary, 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
> +  )
> +{
> +  *(volatile UINT64 *)Address = Value;
> +  return 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
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +  return 0;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +  return 0;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +  return 0;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +  return 0;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +  return 0;
> +}
> +
> +/**
> +  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
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +  return 0;
> +}
> +
> +/**
> +  Reads a 64-bit I/O port.
> +
> +  Reads the 64-bit I/O port specified by Port. The 64-bit read value is returned.
> +  This function must guarantee that all I/O read and write operations are
> +  serialized.
> +
> +  If 64-bit I/O port operations are not supported, then ASSERT().
> +  If Port is not aligned on a 64-bit boundary, then ASSERT().
> +
> +  @param  Port  The I/O port to read.
> +
> +  @return The value read.
> +
> +**/
> +UINT64
> +EFIAPI
> +IoRead64 (
> +  IN      UINTN                     Port
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +  return 0;
> +}
> +
> +/**
> +  Writes a 64-bit I/O port.
> +
> +  Writes the 64-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 64-bit I/O port operations are not supported, then ASSERT().
> +  If Port is not aligned on a 64-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 to the I/O port.
> +
> +**/
> +UINT64
> +EFIAPI
> +IoWrite64 (
> +  IN      UINTN                     Port,
> +  IN      UINT64                    Value
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +  return 0;
> +}
> +
> +/**
> +  Reads an 8-bit I/O port fifo into a block of memory.
> +
> +  Reads the 8-bit I/O fifo port specified by Port.
> +  The port is read Count times, and the read data is
> +  stored in the provided Buffer.
> +
> +  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.
> +  @param  Count   The number of times to read I/O port.
> +  @param  Buffer  The buffer to store the read data into.
> +
> +**/
> +VOID
> +EFIAPI
> +IoReadFifo8 (
> +  IN      UINTN                     Port,
> +  IN      UINTN                     Count,
> +  OUT     VOID                      *Buffer
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Writes a block of memory into an 8-bit I/O port fifo.
> +
> +  Writes the 8-bit I/O fifo port specified by Port.
> +  The port is written Count times, and the write data is
> +  retrieved from the provided Buffer.
> +
> +  This function must guarantee that all I/O write 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  Count   The number of times to write I/O port.
> +  @param  Buffer  The buffer to retrieve the write data from.
> +
> +**/
> +VOID
> +EFIAPI
> +IoWriteFifo8 (
> +  IN      UINTN                     Port,
> +  IN      UINTN                     Count,
> +  IN      VOID                      *Buffer
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Reads a 16-bit I/O port fifo into a block of memory.
> +
> +  Reads the 16-bit I/O fifo port specified by Port.
> +  The port is read Count times, and the read data is
> +  stored in the provided Buffer.
> +
> +  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.
> +  @param  Count   The number of times to read I/O port.
> +  @param  Buffer  The buffer to store the read data into.
> +
> +**/
> +VOID
> +EFIAPI
> +IoReadFifo16 (
> +  IN      UINTN                     Port,
> +  IN      UINTN                     Count,
> +  OUT     VOID                      *Buffer
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Writes a block of memory into a 16-bit I/O port fifo.
> +
> +  Writes the 16-bit I/O fifo port specified by Port.
> +  The port is written Count times, and the write data is
> +  retrieved from the provided Buffer.
> +
> +  This function must guarantee that all I/O write 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  Count   The number of times to write I/O port.
> +  @param  Buffer  The buffer to retrieve the write data from.
> +
> +**/
> +VOID
> +EFIAPI
> +IoWriteFifo16 (
> +  IN      UINTN                     Port,
> +  IN      UINTN                     Count,
> +  IN      VOID                      *Buffer
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Reads a 32-bit I/O port fifo into a block of memory.
> +
> +  Reads the 32-bit I/O fifo port specified by Port.
> +  The port is read Count times, and the read data is
> +  stored in the provided Buffer.
> +
> +  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.
> +  @param  Count   The number of times to read I/O port.
> +  @param  Buffer  The buffer to store the read data into.
> +
> +**/
> +VOID
> +EFIAPI
> +IoReadFifo32 (
> +  IN      UINTN                     Port,
> +  IN      UINTN                     Count,
> +  OUT     VOID                      *Buffer
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +}
> +
> +/**
> +  Writes a block of memory into a 32-bit I/O port fifo.
> +
> +  Writes the 32-bit I/O fifo port specified by Port.
> +  The port is written Count times, and the write data is
> +  retrieved from the provided Buffer.
> +
> +  This function must guarantee that all I/O write 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  Count   The number of times to write I/O port.
> +  @param  Buffer  The buffer to retrieve the write data from.
> +
> +**/
> +VOID
> +EFIAPI
> +IoWriteFifo32 (
> +  IN      UINTN                     Port,
> +  IN      UINTN                     Count,
> +  IN      VOID                      *Buffer
> +  )
> +{
> +  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
> +  ASSERT (FALSE);
> +}
> -- 
> 2.7.4
> 
> 
> 
>