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| author | Bret Barkelew <brbarkel@microsoft.com> | 2019-01-04 10:22:12 +0800 |
|---|---|---|
| committer | Liming Gao <liming.gao@intel.com> | 2019-01-31 20:19:24 +0800 |
| commit | 37bf678761d4a7dae8875f25d07c290da307b64c (patch) | |
| tree | ced1582b0a78b511b7612b08189c5ecc827846f1 /MdePkg/Library/UefiLib | |
| parent | ca67441558cbe7d482ebf9506fee01b82447ddf1 (diff) | |
| download | edk2-37bf678761d4a7dae8875f25d07c290da307b64c.tar.gz edk2-37bf678761d4a7dae8875f25d07c290da307b64c.tar.bz2 edk2-37bf678761d4a7dae8875f25d07c290da307b64c.zip | |
MdePkg/UefiLib: Add a new API GetVariable3
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1396
Add a new API GetVariable3, which can return the attributes of a variable during reading it.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jiansong Xu <jiansongx.xu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Diffstat (limited to 'MdePkg/Library/UefiLib')
| -rw-r--r-- | MdePkg/Library/UefiLib/UefiLib.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/MdePkg/Library/UefiLib/UefiLib.c b/MdePkg/Library/UefiLib/UefiLib.c index 39d0ce2b21..475017690c 100644 --- a/MdePkg/Library/UefiLib/UefiLib.c +++ b/MdePkg/Library/UefiLib/UefiLib.c @@ -1439,6 +1439,87 @@ GetVariable2 ( return Status;
}
+/** Return the attributes of the variable.
+
+ Returns the status whether get the variable success. The function retrieves
+ variable through the UEFI Runtime Service GetVariable(). The
+ returned buffer is allocated using AllocatePool(). The caller is responsible
+ for freeing this buffer with FreePool(). The attributes are returned if
+ the caller provides a valid Attribute parameter.
+
+ If Name is NULL, then ASSERT().
+ If Guid is NULL, then ASSERT().
+ If Value is NULL, then ASSERT().
+
+ @param[in] Name The pointer to a Null-terminated Unicode string.
+ @param[in] Guid The pointer to an EFI_GUID structure
+ @param[out] Value The buffer point saved the variable info.
+ @param[out] Size The buffer size of the variable.
+ @param[out] Attr The pointer to the variable attributes as found in var store
+
+ @retval EFI_OUT_OF_RESOURCES Allocate buffer failed.
+ @retval EFI_SUCCESS Find the specified variable.
+ @retval Others Errors Return errors from call to gRT->GetVariable.
+
+**/
+EFI_STATUS
+EFIAPI
+GetVariable3(
+ IN CONST CHAR16 *Name,
+ IN CONST EFI_GUID *Guid,
+ OUT VOID **Value,
+ OUT UINTN *Size OPTIONAL,
+ OUT UINT32 *Attr OPTIONAL
+ )
+{
+ EFI_STATUS Status;
+ UINTN BufferSize;
+
+ ASSERT(Name != NULL && Guid != NULL && Value != NULL);
+
+ //
+ // Try to get the variable size.
+ //
+ BufferSize = 0;
+ *Value = NULL;
+ if (Size != NULL) {
+ *Size = 0;
+ }
+
+ if (Attr != NULL) {
+ *Attr = 0;
+ }
+
+ Status = gRT->GetVariable((CHAR16 *)Name, (EFI_GUID *)Guid, Attr, &BufferSize, *Value);
+ if (Status != EFI_BUFFER_TOO_SMALL) {
+ return Status;
+ }
+
+ //
+ // Allocate buffer to get the variable.
+ //
+ *Value = AllocatePool(BufferSize);
+ ASSERT(*Value != NULL);
+ if (*Value == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ //
+ // Get the variable data.
+ //
+ Status = gRT->GetVariable((CHAR16 *)Name, (EFI_GUID *)Guid, Attr, &BufferSize, *Value);
+ if (EFI_ERROR(Status)) {
+ FreePool(*Value);
+ *Value = NULL;
+ }
+
+ if (Size != NULL) {
+ *Size = BufferSize;
+ }
+
+ return Status;
+}
+
/**
Returns a pointer to an allocated buffer that contains the contents of a
variable retrieved through the UEFI Runtime Service GetVariable(). This
|