OvmfPkg QemuFwCfgLib: Fix broken IA32 Microsoft assembler code

[mirror_edk2.git] / OvmfPkg / Library / QemuFwCfgLib / QemuFwCfgLib.c

/** @file\r
\r
  Copyright (c) 2011 - 2012, Intel Corporation. All rights reserved.<BR>\r
\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "Uefi.h"\r
#include <Library/BaseLib.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/IoLib.h>\r
#include <Library/QemuFwCfgLib.h>\r
#include <Library/MemoryAllocationLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
\r
STATIC BOOLEAN mQemuFwCfgSupported = FALSE;\r
\r
\r
/**\r
  Reads an 8-bit I/O port fifo into a block of memory.\r
\r
  Reads the 8-bit I/O fifo port specified by Port.\r
\r
  The port is read Count times, and the read data is\r
  stored in the provided Buffer.\r
\r
  This function must guarantee that all I/O read and write operations are\r
  serialized.\r
\r
  If 8-bit I/O port operations are not supported, then ASSERT().\r
\r
  @param  Port    The I/O port to read.\r
  @param  Count   The number of times to read I/O port.\r
  @param  Buffer  The buffer to store the read data into.\r
\r
**/\r
VOID\r
EFIAPI\r
IoReadFifo8 (\r
  IN      UINTN                     Port,\r
  IN      UINTN                     Count,\r
  OUT     VOID                      *Buffer\r
  );\r
\r
\r
/**\r
  Returns a boolean indicating if the firmware configuration interface\r
  is available or not.\r
\r
  @retval    TRUE   The interface is available\r
  @retval    FALSE  The interface is not available\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
QemuFwCfgIsAvailable (\r
  VOID\r
  )\r
{\r
  return mQemuFwCfgSupported;\r
}\r
\r
\r
/**\r
  Selects a firmware configuration item for reading.\r
  \r
  Following this call, any data read from this item will start from\r
  the beginning of the configuration item's data.\r
\r
  @param[in] QemuFwCfgItem - Firmware Configuration item to read\r
\r
**/\r
VOID\r
EFIAPI\r
QemuFwCfgSelectItem (\r
  IN FIRMWARE_CONFIG_ITEM   QemuFwCfgItem\r
  )\r
{\r
  DEBUG ((EFI_D_INFO, "Select Item: 0x%x\n", (UINT16)(UINTN) QemuFwCfgItem));\r
  IoWrite16 (0x510, (UINT16)(UINTN) QemuFwCfgItem);\r
}\r
\r
\r
/**\r
  Reads firmware configuration bytes into a buffer\r
\r
  @param[in] Size - Size in bytes to read\r
  @param[in] Buffer - Buffer to store data into  (OPTIONAL if Size is 0)\r
\r
**/\r
VOID\r
EFIAPI\r
InternalQemuFwCfgReadBytes (\r
  IN UINTN                  Size,\r
  IN VOID                   *Buffer  OPTIONAL\r
  )\r
{\r
  IoReadFifo8 (0x511, Size, Buffer);\r
}\r
\r
\r
/**\r
  Reads firmware configuration bytes into a buffer\r
\r
  If called multiple times, then the data read will\r
  continue at the offset of the firmware configuration\r
  item where the previous read ended.\r
\r
  @param[in] Size - Size in bytes to read\r
  @param[in] Buffer - Buffer to store data into\r
\r
**/\r
VOID\r
EFIAPI\r
QemuFwCfgReadBytes (\r
  IN UINTN                  Size,\r
  IN VOID                   *Buffer\r
  )\r
{\r
  if (mQemuFwCfgSupported) {\r
    InternalQemuFwCfgReadBytes (Size, Buffer);\r
  } else {\r
    ZeroMem (Buffer, Size);\r
  }\r
}\r
\r
\r
/**\r
  Reads a UINT8 firmware configuration value\r
\r
  @return    Value of Firmware Configuration item read\r
\r
**/\r
UINT8\r
EFIAPI\r
QemuFwCfgRead8 (\r
  VOID\r
  )\r
{\r
  UINT8 Result;\r
\r
  QemuFwCfgReadBytes (sizeof (Result), &Result);\r
\r
  return Result;\r
}\r
\r
\r
/**\r
  Reads a UINT16 firmware configuration value\r
\r
  @return    Value of Firmware Configuration item read\r
\r
**/\r
UINT16\r
EFIAPI\r
QemuFwCfgRead16 (\r
  VOID\r
  )\r
{\r
  UINT16 Result;\r
\r
  QemuFwCfgReadBytes (sizeof (Result), &Result);\r
\r
  return Result;\r
}\r
\r
\r
/**\r
  Reads a UINT32 firmware configuration value\r
\r
  @return    Value of Firmware Configuration item read\r
\r
**/\r
UINT32\r
EFIAPI\r
QemuFwCfgRead32 (\r
  VOID\r
  )\r
{\r
  UINT32 Result;\r
\r
  QemuFwCfgReadBytes (sizeof (Result), &Result);\r
\r
  return Result;\r
}\r
\r
\r
/**\r
  Reads a UINT64 firmware configuration value\r
\r
  @return    Value of Firmware Configuration item read\r
\r
**/\r
UINT64\r
EFIAPI\r
QemuFwCfgRead64 (\r
  VOID\r
  )\r
{\r
  UINT64 Result;\r
\r
  QemuFwCfgReadBytes (sizeof (Result), &Result);\r
\r
  return Result;\r
}\r
\r
\r
RETURN_STATUS\r
EFIAPI\r
QemuFwCfgInitialize (\r
  VOID\r
  )\r
{\r
  UINT32 Signature;\r
  UINT32 Revision;\r
\r
  //\r
  // Enable the access routines while probing to see if it is supported.\r
  //\r
  mQemuFwCfgSupported = TRUE;\r
\r
  QemuFwCfgSelectItem (QemuFwCfgItemSignature);\r
  Signature = QemuFwCfgRead32 ();\r
  DEBUG ((EFI_D_INFO, "FW CFG Signature: 0x%x\n", Signature));\r
  QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);\r
  Revision = QemuFwCfgRead32 ();\r
  DEBUG ((EFI_D_INFO, "FW CFG Revision: 0x%x\n", Revision));\r
  if ((Signature != SIGNATURE_32 ('Q', 'E', 'M', 'U')) ||\r
      (Revision < 1)\r
     ) {\r
    DEBUG ((EFI_D_INFO, "QemuFwCfg interface not supported.\n"));\r
    mQemuFwCfgSupported = FALSE;\r
    return RETURN_SUCCESS;\r
  }\r
\r
  DEBUG ((EFI_D_INFO, "QemuFwCfg interface is supported.\n"));\r
  return RETURN_SUCCESS;\r
}\r
\r
\r
/**\r
  Find the configuration item corresponding to the firmware configuration file.\r
\r
  @param[in]  Name - Name of file to look up.\r
  @param[out] Item - Configuration item corresponding to the file, to be passed\r
                     to QemuFwCfgSelectItem ().\r
  @param[out] Size - Number of bytes in the file.\r
\r
  @return    RETURN_SUCCESS       If file is found.\r
             RETURN_NOT_FOUND     If file is not found.\r
             RETURN_UNSUPPORTED   If firmware configuration is unavailable.\r
\r
**/\r
RETURN_STATUS\r
EFIAPI\r
QemuFwCfgFindFile (\r
  IN   CONST CHAR8           *Name,\r
  OUT  FIRMWARE_CONFIG_ITEM  *Item,\r
  OUT  UINTN                 *Size\r
  )\r
{\r
  UINT32 Count;\r
  UINT32 Idx;\r
\r
  if (!mQemuFwCfgSupported) {\r
    return RETURN_UNSUPPORTED;\r
  }\r
\r
  QemuFwCfgSelectItem (QemuFwCfgItemFileDir);\r
  Count = SwapBytes32 (QemuFwCfgRead32 ());\r
\r
  for (Idx = 0; Idx < Count; ++Idx) {\r
    UINT32 FileSize;\r
    UINT16 FileSelect;\r
    UINT16 FileReserved;\r
    CHAR8  FName[56];\r
\r
    FileSize     = QemuFwCfgRead32 ();\r
    FileSelect   = QemuFwCfgRead16 ();\r
    FileReserved = QemuFwCfgRead16 ();\r
    InternalQemuFwCfgReadBytes (sizeof (FName), FName);\r
\r
    if (AsciiStrCmp (Name, FName) == 0) {\r
      *Item = SwapBytes16 (FileSelect);\r
      *Size = SwapBytes32 (FileSize);\r
      return RETURN_SUCCESS;\r
    }\r
  }\r
\r
  return RETURN_NOT_FOUND;\r
}\r