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| author | jljusten <jljusten@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-07-23 17:10:29 +0000 |
|---|---|---|
| committer | jljusten <jljusten@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-07-23 17:10:29 +0000 |
| commit | 0ac9bc9be45eace87fa43d395889274051badccc (patch) | |
| tree | 860e4dcf7e23ca389cd64a823eb6ac6dc73812e5 /OvmfPkg/Library/QemuFwCfgLib | |
| parent | 05916c1532d79d875eac14c71c266e1912582532 (diff) | |
| download | edk2-0ac9bc9be45eace87fa43d395889274051badccc.tar.gz edk2-0ac9bc9be45eace87fa43d395889274051badccc.tar.bz2 edk2-0ac9bc9be45eace87fa43d395889274051badccc.zip | |
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
Diffstat (limited to 'OvmfPkg/Library/QemuFwCfgLib')
| -rw-r--r-- | OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c index b94dc67392..8caab42e8b 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c @@ -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;
+}
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