[PATCH 07/13] OvmfPkg: add QemuFwCfgS3LibNull

["Rebecca Cran" <rebecca@bsdio.com>]

Add a null implementation of QemuFwCfgS3Lib, for bhyve.

Signed-off-by: Rebecca Cran <rebecca@bsdio.com>
---
 .../PeiQemuFwCfgS3LibFwCfgNull.inf            |  39 ++++
 .../QemuFwCfgS3BasePeiNull.c                  | 221 ++++++++++++++++++
 .../QemuFwCfgS3LibNull/QemuFwCfgS3PeiNull.c   |  80 +++++++
 3 files changed, 340 insertions(+)
 create mode 100644 OvmfPkg/Library/QemuFwCfgS3LibNull/PeiQemuFwCfgS3LibFwCfgNull.inf
 create mode 100644 OvmfPkg/Library/QemuFwCfgS3LibNull/QemuFwCfgS3BasePeiNull.c
 create mode 100644 OvmfPkg/Library/QemuFwCfgS3LibNull/QemuFwCfgS3PeiNull.c

diff --git a/OvmfPkg/Library/QemuFwCfgS3LibNull/PeiQemuFwCfgS3LibFwCfgNull.inf b/OvmfPkg/Library/QemuFwCfgS3LibNull/PeiQemuFwCfgS3LibFwCfgNull.inf
new file mode 100644
index 0000000000..709715a4b8
--- /dev/null
+++ b/OvmfPkg/Library/QemuFwCfgS3LibNull/PeiQemuFwCfgS3LibFwCfgNull.inf
@@ -0,0 +1,39 @@
+## @file
+# Limited functionality QemuFwCfgS3Lib instance, for PEI phase modules.
+#
+# QemuFwCfgS3Enabled() queries S3 enablement via fw_cfg. Other library APIs
+# will report lack of support.
+#
+#  Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+# Copyright (C) 2017, Red Hat, Inc.
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+  INF_VERSION                    = 1.25
+  BASE_NAME                      = PeiQemuFwCfgS3LibFwCfg
+  FILE_GUID                      = C3E69E90-20D3-4E45-935C-7189899BEAC1
+  MODULE_TYPE                    = PEIM
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = QemuFwCfgS3Lib|PEIM
+
+#
+# The following information is for reference only and not required by the build
+# tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 ARM AARCH64 EBC
+#
+
+[Sources]
+  QemuFwCfgS3BasePeiNull.c
+  QemuFwCfgS3PeiNull.c
+  QemuFwCfgS3PeiDxeNull.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+  DebugLib
+  QemuFwCfgLib
diff --git a/OvmfPkg/Library/QemuFwCfgS3LibNull/QemuFwCfgS3BasePeiNull.c b/OvmfPkg/Library/QemuFwCfgS3LibNull/QemuFwCfgS3BasePeiNull.c
new file mode 100644
index 0000000000..3ec6209ba4
--- /dev/null
+++ b/OvmfPkg/Library/QemuFwCfgS3LibNull/QemuFwCfgS3BasePeiNull.c
@@ -0,0 +1,221 @@
+/** @file
+  Shared code for the Base Null and PEI fw_cfg instances of the QemuFwCfgS3Lib
+  class.
+
+  Copyright (C) 2017, Red Hat, Inc.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Library/DebugLib.h>
+#include <Library/QemuFwCfgS3Lib.h>
+
+/**
+  Produce ACPI S3 Boot Script opcodes that (optionally) select an fw_cfg item,
+  and transfer data to it.
+
+  The opcodes produced by QemuFwCfgS3ScriptWriteBytes() will first restore
+  NumberOfBytes bytes in ScratchBuffer in-place, in reserved memory, then write
+  them to fw_cfg using DMA.
+
+  If the operation fails during S3 resume, the boot script will hang.
+
+  This function may only be called from the client module's
+  FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION, which was passed to
+  QemuFwCfgS3CallWhenBootScriptReady() as Callback.
+
+  @param[in] FirmwareConfigItem  The UINT16 selector key of the firmware config
+                                 item to write, expressed as INT32. If
+                                 FirmwareConfigItem is -1, no selection is
+                                 made, the write will occur to the currently
+                                 selected item, at its currently selected
+                                 offset. Otherwise, the specified item will be
+                                 selected, and the write will occur at offset
+                                 0.
+
+  @param[in] NumberOfBytes       Size of the data to restore in ScratchBuffer,
+                                 and to write from ScratchBuffer, during S3
+                                 resume. NumberOfBytes must not exceed
+                                 ScratchBufferSize, which was passed to
+                                 QemuFwCfgS3CallWhenBootScriptReady().
+
+  @retval RETURN_SUCCESS            The opcodes were appended to the ACPI S3
+                                    Boot Script successfully. There is no way
+                                    to undo this action.
+
+  @retval RETURN_INVALID_PARAMETER  FirmwareConfigItem is invalid.
+
+  @retval RETURN_BAD_BUFFER_SIZE    NumberOfBytes is larger than
+                                    ScratchBufferSize.
+
+  @return                           Error codes from underlying functions.
+**/
+RETURN_STATUS
+EFIAPI
+QemuFwCfgS3ScriptWriteBytes (
+  IN INT32 FirmwareConfigItem,
+  IN UINTN NumberOfBytes
+  )
+{
+  ASSERT (FALSE);
+  return RETURN_UNSUPPORTED;
+}
+
+
+/**
+  Produce ACPI S3 Boot Script opcodes that (optionally) select an fw_cfg item,
+  and transfer data from it.
+
+  The opcodes produced by QemuFwCfgS3ScriptReadBytes() will read NumberOfBytes
+  bytes from fw_cfg using DMA, storing the result in ScratchBuffer, in reserved
+  memory.
+
+  If the operation fails during S3 resume, the boot script will hang.
+
+  This function may only be called from the client module's
+  FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION, which was passed to
+  QemuFwCfgS3CallWhenBootScriptReady() as Callback.
+
+  @param[in] FirmwareConfigItem  The UINT16 selector key of the firmware config
+                                 item to read, expressed as INT32. If
+                                 FirmwareConfigItem is -1, no selection is
+                                 made, the read will occur from the currently
+                                 selected item, from its currently selected
+                                 offset. Otherwise, the specified item will be
+                                 selected, and the read will occur from offset
+                                 0.
+
+  @param[in] NumberOfBytes       Size of the data to read during S3 resume.
+                                 NumberOfBytes must not exceed
+                                 ScratchBufferSize, which was passed to
+                                 QemuFwCfgS3CallWhenBootScriptReady().
+
+  @retval RETURN_SUCCESS            The opcodes were appended to the ACPI S3
+                                    Boot Script successfully. There is no way
+                                    to undo this action.
+
+  @retval RETURN_INVALID_PARAMETER  FirmwareConfigItem is invalid.
+
+  @retval RETURN_BAD_BUFFER_SIZE    NumberOfBytes is larger than
+                                    ScratchBufferSize.
+
+  @return                           Error codes from underlying functions.
+**/
+RETURN_STATUS
+EFIAPI
+QemuFwCfgS3ScriptReadBytes (
+  IN INT32 FirmwareConfigItem,
+  IN UINTN NumberOfBytes
+  )
+{
+  ASSERT (FALSE);
+  return RETURN_UNSUPPORTED;
+}
+
+
+/**
+  Produce ACPI S3 Boot Script opcodes that (optionally) select an fw_cfg item,
+  and increase its offset.
+
+  If the operation fails during S3 resume, the boot script will hang.
+
+  This function may only be called from the client module's
+  FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION, which was passed to
+  QemuFwCfgS3CallWhenBootScriptReady() as Callback.
+
+  @param[in] FirmwareConfigItem  The UINT16 selector key of the firmware config
+                                 item to advance the offset of, expressed as
+                                 INT32. If FirmwareConfigItem is -1, no
+                                 selection is made, and the offset for the
+                                 currently selected item is increased.
+                                 Otherwise, the specified item will be
+                                 selected, and the offset increment will occur
+                                 from offset 0.
+
+  @param[in] NumberOfBytes       The number of bytes to skip in the subject
+                                 fw_cfg item.
+
+  @retval RETURN_SUCCESS            The opcodes were appended to the ACPI S3
+                                    Boot Script successfully. There is no way
+                                    to undo this action.
+
+  @retval RETURN_INVALID_PARAMETER  FirmwareConfigItem is invalid.
+
+  @retval RETURN_BAD_BUFFER_SIZE    NumberOfBytes is too large.
+
+  @return                           Error codes from underlying functions.
+**/
+RETURN_STATUS
+EFIAPI
+QemuFwCfgS3ScriptSkipBytes (
+  IN INT32 FirmwareConfigItem,
+  IN UINTN NumberOfBytes
+  )
+{
+  ASSERT (FALSE);
+  return RETURN_UNSUPPORTED;
+}
+
+
+/**
+  Produce ACPI S3 Boot Script opcodes that check a value in ScratchBuffer.
+
+  If the check fails during S3 resume, the boot script will hang.
+
+  This function may only be called from the client module's
+  FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION, which was passed to
+  QemuFwCfgS3CallWhenBootScriptReady() as Callback.
+
+  @param[in] ScratchData  Pointer to the UINT8, UINT16, UINT32 or UINT64 field
+                          in ScratchBuffer that should be checked. The caller
+                          is responsible for populating the field during S3
+                          resume, by calling QemuFwCfgS3ScriptReadBytes() ahead
+                          of QemuFwCfgS3ScriptCheckValue().
+
+                          ScratchData must point into ScratchBuffer, which was
+                          allocated, and passed to Callback(), by
+                          QemuFwCfgS3CallWhenBootScriptReady().
+
+                          ScratchData must be aligned at ValueSize bytes.
+
+  @param[in] ValueSize    One of 1, 2, 4 or 8, specifying the size of the field
+                          to check.
+
+  @param[in] ValueMask    The value read from ScratchData is binarily AND-ed
+                          with ValueMask, and the result is compared against
+                          Value. If the masked data equals Value, the check
+                          passes, and the boot script can proceed. Otherwise,
+                          the check fails, and the boot script hangs.
+
+  @param[in] Value        Refer to ValueMask.
+
+  @retval RETURN_SUCCESS            The opcodes were appended to the ACPI S3
+                                    Boot Script successfully. There is no way
+                                    to undo this action.
+
+  @retval RETURN_INVALID_PARAMETER  ValueSize is invalid.
+
+  @retval RETURN_INVALID_PARAMETER  ValueMask or Value cannot be represented in
+                                    ValueSize bytes.
+
+  @retval RETURN_INVALID_PARAMETER  ScratchData is not aligned at ValueSize
+                                    bytes.
+
+  @retval RETURN_BAD_BUFFER_SIZE    The ValueSize bytes at ScratchData aren't
+                                    wholly contained in the ScratchBufferSize
+                                    bytes at ScratchBuffer.
+
+  @return                           Error codes from underlying functions.
+**/
+RETURN_STATUS
+EFIAPI
+QemuFwCfgS3ScriptCheckValue (
+  IN VOID   *ScratchData,
+  IN UINT8  ValueSize,
+  IN UINT64 ValueMask,
+  IN UINT64 Value
+  )
+{
+  ASSERT (FALSE);
+  return RETURN_UNSUPPORTED;
+}
diff --git a/OvmfPkg/Library/QemuFwCfgS3LibNull/QemuFwCfgS3PeiNull.c b/OvmfPkg/Library/QemuFwCfgS3LibNull/QemuFwCfgS3PeiNull.c
new file mode 100644
index 0000000000..0d055cacbd
--- /dev/null
+++ b/OvmfPkg/Library/QemuFwCfgS3LibNull/QemuFwCfgS3PeiNull.c
@@ -0,0 +1,80 @@
+/** @file
+  Limited functionality QemuFwCfgS3Lib instance, for PEI phase modules.
+
+  QemuFwCfgS3Enabled() queries S3 enablement via fw_cfg. Other library APIs
+  will report lack of support.
+
+  Copyright (C) 2017, Red Hat, Inc.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Library/QemuFwCfgS3Lib.h>
+
+/**
+  Install the client module's FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION callback for
+  when the production of ACPI S3 Boot Script opcodes becomes possible.
+
+  Take ownership of the client-provided Context, and pass it to the callback
+  function, when the latter is invoked.
+
+  Allocate scratch space for those ACPI S3 Boot Script opcodes to work upon
+  that the client will produce in the callback function.
+
+  @param[in] Callback           FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION to invoke
+                                when the production of ACPI S3 Boot Script
+                                opcodes becomes possible. Callback() may be
+                                called immediately from
+                                QemuFwCfgS3CallWhenBootScriptReady().
+
+  @param[in,out] Context        Client-provided data structure for the
+                                Callback() callback function to consume.
+
+                                If Context points to dynamically allocated
+                                memory, then Callback() must release it.
+
+                                If Context points to dynamically allocated
+                                memory, and
+                                QemuFwCfgS3CallWhenBootScriptReady() returns
+                                successfully, then the caller of
+                                QemuFwCfgS3CallWhenBootScriptReady() must
+                                neither dereference nor even evaluate Context
+                                any longer, as ownership of the referenced area
+                                has been transferred to Callback().
+
+  @param[in] ScratchBufferSize  The size of the scratch buffer that will hold,
+                                in reserved memory, all client data read,
+                                written, and checked by the ACPI S3 Boot Script
+                                opcodes produced by Callback().
+
+  @retval RETURN_UNSUPPORTED       The library instance does not support this
+                                   function.
+
+  @retval RETURN_NOT_FOUND         The fw_cfg DMA interface to QEMU is
+                                   unavailable.
+
+  @retval RETURN_BAD_BUFFER_SIZE   ScratchBufferSize is too large.
+
+  @retval RETURN_OUT_OF_RESOURCES  Memory allocation failed.
+
+  @retval RETURN_SUCCESS           Callback() has been installed, and the
+                                   ownership of Context has been transferred.
+                                   Reserved memory has been allocated for the
+                                   scratch buffer.
+
+                                   A successful invocation of
+                                   QemuFwCfgS3CallWhenBootScriptReady() cannot
+                                   be rolled back.
+
+  @return                          Error codes from underlying functions.
+**/
+RETURN_STATUS
+EFIAPI
+QemuFwCfgS3CallWhenBootScriptReady (
+  IN     FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION *Callback,
+  IN OUT VOID                                 *Context,          OPTIONAL
+  IN     UINTN                                ScratchBufferSize
+  )
+{
+  return RETURN_UNSUPPORTED;
+}
-- 
2.26.1