OvmfPkg/QemuFwCfgLib: Provide Pei and Dxe specific library

Current QemuFwCfgLib.inf is used in both Pei and Dxe phases. Add Pei and Dxe inf file to provide a seperate QemuFwCfgLib instances for Pei and Dxe phases. Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
2017-07-06 09:28:47 -04:00
parent f9d129e68a
commit fee47a261c
7 changed files with 176 additions and 7 deletions
--- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c
+++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPei.c
@@ -0,0 +1,116 @@
+/** @file
+
+  Stateful and implicitly initialized fw_cfg library implementation.
+
+  Copyright (C) 2013, Red Hat, Inc.
+  Copyright (c) 2011 - 2013, 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 <Library/DebugLib.h>
+#include <Library/QemuFwCfgLib.h>
+
+#include "QemuFwCfgLibInternal.h"
+
+STATIC BOOLEAN mQemuFwCfgSupported = FALSE;
+STATIC BOOLEAN mQemuFwCfgDmaSupported;
+
+
+/**
+  Returns a boolean indicating if the firmware configuration interface
+  is available or not.
+
+  This function may change fw_cfg state.
+
+  @retval    TRUE   The interface is available
+  @retval    FALSE  The interface is not available
+
+**/
+BOOLEAN
+EFIAPI
+QemuFwCfgIsAvailable (
+  VOID
+  )
+{
+  return InternalQemuFwCfgIsAvailable ();
+}
+
+
+RETURN_STATUS
+EFIAPI
+QemuFwCfgInitialize (
+  VOID
+  )
+{
+  UINT32 Signature;
+  UINT32 Revision;
+
+  //
+  // Enable the access routines while probing to see if it is supported.
+  // For probing we always use the IO Port (IoReadFifo8()) access method.
+  //
+  mQemuFwCfgSupported = TRUE;
+  mQemuFwCfgDmaSupported = FALSE;
+
+  QemuFwCfgSelectItem (QemuFwCfgItemSignature);
+  Signature = QemuFwCfgRead32 ();
+  DEBUG ((EFI_D_INFO, "FW CFG Signature: 0x%x\n", Signature));
+  QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);
+  Revision = QemuFwCfgRead32 ();
+  DEBUG ((EFI_D_INFO, "FW CFG Revision: 0x%x\n", Revision));
+  if ((Signature != SIGNATURE_32 ('Q', 'E', 'M', 'U')) ||
+      (Revision < 1)
+     ) {
+    DEBUG ((EFI_D_INFO, "QemuFwCfg interface not supported.\n"));
+    mQemuFwCfgSupported = FALSE;
+    return RETURN_SUCCESS;
+  }
+
+  if ((Revision & FW_CFG_F_DMA) == 0) {
+    DEBUG ((DEBUG_INFO, "QemuFwCfg interface (IO Port) is supported.\n"));
+  } else {
+    mQemuFwCfgDmaSupported = TRUE;
+    DEBUG ((DEBUG_INFO, "QemuFwCfg interface (DMA) is supported.\n"));
+  }
+  return RETURN_SUCCESS;
+}
+
+
+/**
+  Returns a boolean indicating if the firmware configuration interface is
+  available for library-internal purposes.
+
+  This function never changes fw_cfg state.
+
+  @retval    TRUE   The interface is available internally.
+  @retval    FALSE  The interface is not available internally.
+**/
+BOOLEAN
+InternalQemuFwCfgIsAvailable (
+  VOID
+  )
+{
+  return mQemuFwCfgSupported;
+}
+
+/**
+  Returns a boolean indicating whether QEMU provides the DMA-like access method
+  for fw_cfg.
+
+  @retval    TRUE   The DMA-like access method is available.
+  @retval    FALSE  The DMA-like access method is unavailable.
+**/
+BOOLEAN
+InternalQemuFwCfgDmaIsAvailable (
+  VOID
+  )
+{
+  return mQemuFwCfgDmaSupported;
+}