[edk2-staging/RISC-V-V2 PATCH v1 6/22]: MdePkg/BaseCacheMaintenanceLib: RISC-V cache maintenance implementation.

["Abner Chang" <abner.chang@hpe.com>]

Implement RISC-V cache maintenance functions in BaseCacheMaintenanceLib.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Abner Chang <abner.chang@hpe.com>
---
 .../BaseCacheMaintenanceLib.inf                    |   4 +
 .../Library/BaseCacheMaintenanceLib/RiscVCache.c   | 242 +++++++++++++++++++++
 2 files changed, 246 insertions(+)
 create mode 100644 MdePkg/Library/BaseCacheMaintenanceLib/RiscVCache.c

diff --git a/MdePkg/Library/BaseCacheMaintenanceLib/BaseCacheMaintenanceLib.inf b/MdePkg/Library/BaseCacheMaintenanceLib/BaseCacheMaintenanceLib.inf
index ec7feec..d9bfa04 100644
--- a/MdePkg/Library/BaseCacheMaintenanceLib/BaseCacheMaintenanceLib.inf
+++ b/MdePkg/Library/BaseCacheMaintenanceLib/BaseCacheMaintenanceLib.inf
@@ -6,6 +6,7 @@
 #
 #  Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
 #  Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+#  Copyright (c) 2016, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
 #
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -41,6 +42,9 @@
 [Sources.AARCH64]
   ArmCache.c
 
+[Sources.RISCV64]
+  RiscVCache.c
+
 [Packages]
   MdePkg/MdePkg.dec
 
diff --git a/MdePkg/Library/BaseCacheMaintenanceLib/RiscVCache.c b/MdePkg/Library/BaseCacheMaintenanceLib/RiscVCache.c
new file mode 100644
index 0000000..2d376a4
--- /dev/null
+++ b/MdePkg/Library/BaseCacheMaintenanceLib/RiscVCache.c
@@ -0,0 +1,242 @@
+/** @file
+  RISC-V specific functionality for cache.
+
+  Copyright (c) 2016, 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 <Base.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+
+/**
+  Invalidates the entire instruction cache in cache coherency domain of the
+  calling CPU.
+
+**/
+VOID
+EFIAPI
+InvalidateInstructionCache (
+  VOID
+  )
+{
+  RiscVInvdInstCacheAsm ();
+}
+
+/**
+  Invalidates a range of instruction cache lines in the cache coherency domain
+  of the calling CPU.
+
+  Invalidates the instruction cache lines specified by Address and Length. If
+  Address is not aligned on a cache line boundary, then entire instruction
+  cache line containing Address is invalidated. If Address + Length is not
+  aligned on a cache line boundary, then the entire instruction cache line
+  containing Address + Length -1 is invalidated. This function may choose to
+  invalidate the entire instruction cache if that is more efficient than
+  invalidating the specified range. If Length is 0, then no instruction cache
+  lines are invalidated. Address is returned.
+
+  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().
+
+  @param  Address The base address of the instruction cache lines to
+                  invalidate. If the CPU is in a physical addressing mode, then
+                  Address is a physical address. If the CPU is in a virtual
+                  addressing mode, then Address is a virtual address.
+
+  @param  Length  The number of bytes to invalidate from the instruction cache.
+
+  @return Address.
+
+**/
+VOID *
+EFIAPI
+InvalidateInstructionCacheRange (
+  IN VOID *Address,
+  IN UINTN Length
+  )
+{
+  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupported function.\n", __FUNCTION__));
+  //ASSERT(FALSE);
+  return Address;
+}
+
+/**
+  Writes back and invalidates the entire data cache in cache coherency domain
+  of the calling CPU.
+
+  Writes back and invalidates the entire data cache in cache coherency domain
+  of the calling CPU. This function guarantees that all dirty cache lines are
+  written back to system memory, and also invalidates all the data cache lines
+  in the cache coherency domain of the calling CPU.
+
+**/
+VOID
+EFIAPI
+WriteBackInvalidateDataCache (
+  VOID
+  )
+{
+  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupported function.\n", __FUNCTION__));
+  //ASSERT(FALSE);
+}
+
+/**
+  Writes back and invalidates a range of data cache lines in the cache
+  coherency domain of the calling CPU.
+
+  Writes back and invalidates the data cache lines specified by Address and
+  Length. If Address is not aligned on a cache line boundary, then entire data
+  cache line containing Address is written back and invalidated. If Address +
+  Length is not aligned on a cache line boundary, then the entire data cache
+  line containing Address + Length -1 is written back and invalidated. This
+  function may choose to write back and invalidate the entire data cache if
+  that is more efficient than writing back and invalidating the specified
+  range. If Length is 0, then no data cache lines are written back and
+  invalidated. Address is returned.
+
+  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().
+
+  @param  Address The base address of the data cache lines to write back and
+                  invalidate. If the CPU is in a physical addressing mode, then
+                  Address is a physical address. If the CPU is in a virtual
+                  addressing mode, then Address is a virtual address.
+  @param  Length  The number of bytes to write back and invalidate from the
+                  data cache.
+
+  @return Address of cache invalidation.
+
+**/
+VOID *
+EFIAPI
+WriteBackInvalidateDataCacheRange (
+  IN      VOID                      *Address,
+  IN      UINTN                     Length
+  )
+{
+  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
+  //ASSERT(FALSE);
+  return Address;
+}
+
+/**
+  Writes back the entire data cache in cache coherency domain of the calling
+  CPU.
+
+  Writes back the entire data cache in cache coherency domain of the calling
+  CPU. This function guarantees that all dirty cache lines are written back to
+  system memory. This function may also invalidate all the data cache lines in
+  the cache coherency domain of the calling CPU.
+
+**/
+VOID
+EFIAPI
+WriteBackDataCache (
+  VOID
+  )
+{
+  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
+  //ASSERT(FALSE);
+}
+
+/**
+  Writes back a range of data cache lines in the cache coherency domain of the
+  calling CPU.
+
+  Writes back the data cache lines specified by Address and Length. If Address
+  is not aligned on a cache line boundary, then entire data cache line
+  containing Address is written back. If Address + Length is not aligned on a
+  cache line boundary, then the entire data cache line containing Address +
+  Length -1 is written back. This function may choose to write back the entire
+  data cache if that is more efficient than writing back the specified range.
+  If Length is 0, then no data cache lines are written back. This function may
+  also invalidate all the data cache lines in the specified range of the cache
+  coherency domain of the calling CPU. Address is returned.
+
+  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().
+
+  @param  Address The base address of the data cache lines to write back. If
+                  the CPU is in a physical addressing mode, then Address is a
+                  physical address. If the CPU is in a virtual addressing
+                  mode, then Address is a virtual address.
+  @param  Length  The number of bytes to write back from the data cache.
+
+  @return Address of cache written in main memory.
+
+**/
+VOID *
+EFIAPI
+WriteBackDataCacheRange (
+  IN      VOID                      *Address,
+  IN      UINTN                     Length
+  )
+{
+  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
+  //ASSERT(FALSE);
+  return Address;
+}
+
+/**
+  Invalidates the entire data cache in cache coherency domain of the calling
+  CPU.
+
+  Invalidates the entire data cache in cache coherency domain of the calling
+  CPU. This function must be used with care because dirty cache lines are not
+  written back to system memory. It is typically used for cache diagnostics. If
+  the CPU does not support invalidation of the entire data cache, then a write
+  back and invalidate operation should be performed on the entire data cache.
+
+**/
+VOID
+EFIAPI
+InvalidateDataCache (
+  VOID
+  )
+{
+  RiscVInvdDataCacheAsm ();
+}
+
+/**
+  Invalidates a range of data cache lines in the cache coherency domain of the
+  calling CPU.
+
+  Invalidates the data cache lines specified by Address and Length. If Address
+  is not aligned on a cache line boundary, then entire data cache line
+  containing Address is invalidated. If Address + Length is not aligned on a
+  cache line boundary, then the entire data cache line containing Address +
+  Length -1 is invalidated. This function must never invalidate any cache lines
+  outside the specified range. If Length is 0, then no data cache lines are
+  invalidated. Address is returned. This function must be used with care
+  because dirty cache lines are not written back to system memory. It is
+  typically used for cache diagnostics. If the CPU does not support
+  invalidation of a data cache range, then a write back and invalidate
+  operation should be performed on the data cache range.
+
+  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().
+
+  @param  Address The base address of the data cache lines to invalidate. If
+                  the CPU is in a physical addressing mode, then Address is a
+                  physical address. If the CPU is in a virtual addressing mode,
+                  then Address is a virtual address.
+  @param  Length  The number of bytes to invalidate from the data cache.
+
+  @return Address.
+
+**/
+VOID *
+EFIAPI
+InvalidateDataCacheRange (
+  IN      VOID                      *Address,
+  IN      UINTN                     Length
+  )
+{
+  DEBUG((DEBUG_ERROR, "%a:RISC-V unsupportted function.\n", __FUNCTION__));
+  //ASSERT(FALSE);
+  return Address;
+}
-- 
2.7.4