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OvmfPkg: introduce QemuFwCfgFindFile () 

Tested with the "bootorder" fw_cfg file. Example contents (leading space
added and line terminators transcribed for readability):

  /pci@i0cf8/ide@1,1/drive@0/disk@0<LF>
  /pci@i0cf8/ide@1,1/drive@1/disk@0<LF>
  /pci@i0cf8/ethernet@3/ethernet-phy@0<NUL>

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13549 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
jljusten 2012-07-23 17:10:29 +00:00
parent 05916c1532
commit 0ac9bc9be4
2 changed files with 74 additions and 0 deletions
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21
OvmfPkg/Include/Library/QemuFwCfgLib.h
View File

@ -41,6 +41,7 @@ typedef enum {
QemuFwCfgItemKernelSetupAddress = 0x0016,
QemuFwCfgItemKernelSetupSize = 0x0017,
QemuFwCfgItemKernelSetupData = 0x0018,
QemuFwCfgItemFileDir = 0x0019,
QemuFwCfgItemX86AcpiTables = 0x8000,
QemuFwCfgItemX86SmbiosTables = 0x8001,
@ -153,5 +154,25 @@ QemuFwCfgRead64 (
);
/**
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
);
#endif

53
OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c
View File

@ -244,3 +244,56 @@ QemuFwCfgInitialize (
DEBUG ((EFI_D_INFO, "QemuFwCfg interface is supported.\n"));
return RETURN_SUCCESS;
}
/**
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 (!mQemuFwCfgSupported) {
return RETURN_UNSUPPORTED;
}
QemuFwCfgSelectItem (QemuFwCfgItemFileDir);
Count = SwapBytes32 (QemuFwCfgRead32 ());
for (Idx = 0; Idx < Count; ++Idx) {
UINT32 FileSize;
UINT16 FileSelect;
UINT16 FileReserved;
CHAR8 FName[56];
FileSize = QemuFwCfgRead32 ();
FileSelect = QemuFwCfgRead16 ();
FileReserved = QemuFwCfgRead16 ();
InternalQemuFwCfgReadBytes (sizeof (FName), FName);
if (AsciiStrCmp (Name, FName) == 0) {
*Item = SwapBytes16 (FileSelect);
*Size = SwapBytes32 (FileSize);
return RETURN_SUCCESS;
}
}
return RETURN_NOT_FOUND;
}