1 files changed, 63 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibInternal.h b/roms/edk2/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibInternal.h
new file mode 100644
index 000000000..1fa80686e
--- /dev/null
+++ b/roms/edk2/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibInternal.h
@@ -0,0 +1,63 @@
+/** @file
+  Internal interfaces specific to the QemuFwCfgLib instances in OvmfPkg.
+
+  Copyright (C) 2016, Red Hat, Inc.
+  Copyright (C) 2017, Advanced Micro Devices. All rights reserved
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef __QEMU_FW_CFG_LIB_INTERNAL_H__
+#define __QEMU_FW_CFG_LIB_INTERNAL_H__
+
+/**
+  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
+  );
+
+
+/**
+  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
+  );
+
+/**
+  Transfer an array of bytes, or skip a number of bytes, using the DMA
+  interface.
+
+  @param[in]     Size     Size in bytes to transfer or skip.
+
+  @param[in,out] Buffer   Buffer to read data into or write data from. Ignored,
+                          and may be NULL, if Size is zero, or Control is
+                          FW_CFG_DMA_CTL_SKIP.
+
+  @param[in]     Control  One of the following:
+                          FW_CFG_DMA_CTL_WRITE - write to fw_cfg from Buffer.
+                          FW_CFG_DMA_CTL_READ  - read from fw_cfg into Buffer.
+                          FW_CFG_DMA_CTL_SKIP  - skip bytes in fw_cfg.
+**/
+VOID
+InternalQemuFwCfgDmaBytes (
+  IN     UINT32   Size,
+  IN OUT VOID     *Buffer OPTIONAL,
+  IN     UINT32   Control
+  );
+
+#endif