diff options
Diffstat (limited to 'OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c')
| -rw-r--r-- | OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c | 370 |
1 files changed, 0 insertions, 370 deletions
diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c deleted file mode 100644 index 1bf725d8b7..0000000000 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c +++ /dev/null @@ -1,370 +0,0 @@ -/** @file
-
- Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>
- Copyright (C) 2013, Red Hat, Inc.
- Copyright (c) 2017, AMD Incorporated. 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 "Uefi.h"
-#include <Library/BaseLib.h>
-#include <Library/BaseMemoryLib.h>
-#include <Library/DebugLib.h>
-#include <Library/IoLib.h>
-#include <Library/QemuFwCfgLib.h>
-#include <Library/MemoryAllocationLib.h>
-#include <Library/UefiBootServicesTableLib.h>
-
-#include "QemuFwCfgLibInternal.h"
-
-
-/**
- Selects a firmware configuration item for reading.
-
- Following this call, any data read from this item will start from
- the beginning of the configuration item's data.
-
- @param[in] QemuFwCfgItem - Firmware Configuration item to read
-
-**/
-VOID
-EFIAPI
-QemuFwCfgSelectItem (
- IN FIRMWARE_CONFIG_ITEM QemuFwCfgItem
- )
-{
- DEBUG ((EFI_D_INFO, "Select Item: 0x%x\n", (UINT16)(UINTN) QemuFwCfgItem));
- IoWrite16 (FW_CFG_IO_SELECTOR, (UINT16)(UINTN) QemuFwCfgItem);
-}
-
-
-/**
- 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
- )
-{
- volatile FW_CFG_DMA_ACCESS Access;
- UINT32 AccessHigh, AccessLow;
- UINT32 Status;
-
- ASSERT (Control == FW_CFG_DMA_CTL_WRITE || Control == FW_CFG_DMA_CTL_READ ||
- Control == FW_CFG_DMA_CTL_SKIP);
-
- if (Size == 0) {
- return;
- }
-
- Access.Control = SwapBytes32 (Control);
- Access.Length = SwapBytes32 (Size);
- Access.Address = SwapBytes64 ((UINTN)Buffer);
-
- //
- // Delimit the transfer from (a) modifications to Access, (b) in case of a
- // write, from writes to Buffer by the caller.
- //
- MemoryFence ();
-
- //
- // Start the transfer.
- //
- AccessHigh = (UINT32)RShiftU64 ((UINTN)&Access, 32);
- AccessLow = (UINT32)(UINTN)&Access;
- IoWrite32 (FW_CFG_IO_DMA_ADDRESS, SwapBytes32 (AccessHigh));
- IoWrite32 (FW_CFG_IO_DMA_ADDRESS + 4, SwapBytes32 (AccessLow));
-
- //
- // Don't look at Access.Control before starting the transfer.
- //
- MemoryFence ();
-
- //
- // Wait for the transfer to complete.
- //
- do {
- Status = SwapBytes32 (Access.Control);
- ASSERT ((Status & FW_CFG_DMA_CTL_ERROR) == 0);
- } while (Status != 0);
-
- //
- // After a read, the caller will want to use Buffer.
- //
- MemoryFence ();
-}
-
-
-/**
- Reads firmware configuration bytes into a buffer
-
- @param[in] Size - Size in bytes to read
- @param[in] Buffer - Buffer to store data into (OPTIONAL if Size is 0)
-
-**/
-VOID
-EFIAPI
-InternalQemuFwCfgReadBytes (
- IN UINTN Size,
- IN VOID *Buffer OPTIONAL
- )
-{
- if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {
- InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, FW_CFG_DMA_CTL_READ);
- return;
- }
- IoReadFifo8 (FW_CFG_IO_DATA, Size, Buffer);
-}
-
-
-/**
- Reads firmware configuration bytes into a buffer
-
- If called multiple times, then the data read will
- continue at the offset of the firmware configuration
- item where the previous read ended.
-
- @param[in] Size - Size in bytes to read
- @param[in] Buffer - Buffer to store data into
-
-**/
-VOID
-EFIAPI
-QemuFwCfgReadBytes (
- IN UINTN Size,
- IN VOID *Buffer
- )
-{
- if (InternalQemuFwCfgIsAvailable ()) {
- InternalQemuFwCfgReadBytes (Size, Buffer);
- } else {
- ZeroMem (Buffer, Size);
- }
-}
-
-/**
- Write firmware configuration bytes from a buffer
-
- If called multiple times, then the data written will
- continue at the offset of the firmware configuration
- item where the previous write ended.
-
- @param[in] Size - Size in bytes to write
- @param[in] Buffer - Buffer to read data from
-
-**/
-VOID
-EFIAPI
-QemuFwCfgWriteBytes (
- IN UINTN Size,
- IN VOID *Buffer
- )
-{
- if (InternalQemuFwCfgIsAvailable ()) {
- if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {
- InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, FW_CFG_DMA_CTL_WRITE);
- return;
- }
- IoWriteFifo8 (FW_CFG_IO_DATA, Size, Buffer);
- }
-}
-
-
-/**
- Skip bytes in the firmware configuration item.
-
- Increase the offset of the firmware configuration item without transferring
- bytes between the item and a caller-provided buffer. Subsequent read, write
- or skip operations will commence at the increased offset.
-
- @param[in] Size Number of bytes to skip.
-**/
-VOID
-EFIAPI
-QemuFwCfgSkipBytes (
- IN UINTN Size
- )
-{
- UINTN ChunkSize;
- UINT8 SkipBuffer[256];
-
- if (!InternalQemuFwCfgIsAvailable ()) {
- return;
- }
-
- if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {
- InternalQemuFwCfgDmaBytes ((UINT32)Size, NULL, FW_CFG_DMA_CTL_SKIP);
- return;
- }
-
- //
- // Emulate the skip by reading data in chunks, and throwing it away. The
- // implementation below is suitable even for phases where RAM or dynamic
- // allocation is not available or appropriate. It also doesn't affect the
- // static data footprint for client modules. Large skips are not expected,
- // therefore this fallback is not performance critical. The size of
- // SkipBuffer is thought not to exert a large pressure on the stack in any
- // phase.
- //
- while (Size > 0) {
- ChunkSize = MIN (Size, sizeof SkipBuffer);
- IoReadFifo8 (FW_CFG_IO_DATA, ChunkSize, SkipBuffer);
- Size -= ChunkSize;
- }
-}
-
-
-/**
- Reads a UINT8 firmware configuration value
-
- @return Value of Firmware Configuration item read
-
-**/
-UINT8
-EFIAPI
-QemuFwCfgRead8 (
- VOID
- )
-{
- UINT8 Result;
-
- QemuFwCfgReadBytes (sizeof (Result), &Result);
-
- return Result;
-}
-
-
-/**
- Reads a UINT16 firmware configuration value
-
- @return Value of Firmware Configuration item read
-
-**/
-UINT16
-EFIAPI
-QemuFwCfgRead16 (
- VOID
- )
-{
- UINT16 Result;
-
- QemuFwCfgReadBytes (sizeof (Result), &Result);
-
- return Result;
-}
-
-
-/**
- Reads a UINT32 firmware configuration value
-
- @return Value of Firmware Configuration item read
-
-**/
-UINT32
-EFIAPI
-QemuFwCfgRead32 (
- VOID
- )
-{
- UINT32 Result;
-
- QemuFwCfgReadBytes (sizeof (Result), &Result);
-
- return Result;
-}
-
-
-/**
- Reads a UINT64 firmware configuration value
-
- @return Value of Firmware Configuration item read
-
-**/
-UINT64
-EFIAPI
-QemuFwCfgRead64 (
- VOID
- )
-{
- UINT64 Result;
-
- QemuFwCfgReadBytes (sizeof (Result), &Result);
-
- return Result;
-}
-
-
-/**
- Find the configuration item corresponding to the firmware configuration file.
-
- @param[in] Name - Name of file to look up.
- @param[out] Item - Configuration item corresponding to the file, to be passed
- to QemuFwCfgSelectItem ().
- @param[out] Size - Number of bytes in the file.
-
- @return RETURN_SUCCESS If file is found.
- RETURN_NOT_FOUND If file is not found.
- RETURN_UNSUPPORTED If firmware configuration is unavailable.
-
-**/
-RETURN_STATUS
-EFIAPI
-QemuFwCfgFindFile (
- IN CONST CHAR8 *Name,
- OUT FIRMWARE_CONFIG_ITEM *Item,
- OUT UINTN *Size
- )
-{
- UINT32 Count;
- UINT32 Idx;
-
- if (!InternalQemuFwCfgIsAvailable ()) {
- return RETURN_UNSUPPORTED;
- }
-
- QemuFwCfgSelectItem (QemuFwCfgItemFileDir);
- Count = SwapBytes32 (QemuFwCfgRead32 ());
-
- for (Idx = 0; Idx < Count; ++Idx) {
- UINT32 FileSize;
- UINT16 FileSelect;
- UINT16 FileReserved;
- CHAR8 FName[QEMU_FW_CFG_FNAME_SIZE];
-
- FileSize = QemuFwCfgRead32 ();
- FileSelect = QemuFwCfgRead16 ();
- FileReserved = QemuFwCfgRead16 ();
- (VOID) FileReserved; /* Force a do-nothing reference. */
- InternalQemuFwCfgReadBytes (sizeof (FName), FName);
-
- if (AsciiStrCmp (Name, FName) == 0) {
- *Item = SwapBytes16 (FileSelect);
- *Size = SwapBytes32 (FileSize);
- return RETURN_SUCCESS;
- }
- }
-
- return RETURN_NOT_FOUND;
-}
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