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| author | Laszlo Ersek <lersek@redhat.com> | 2018-04-11 20:58:58 +0200 |
|---|---|---|
| committer | Laszlo Ersek <lersek@redhat.com> | 2018-04-12 21:24:30 +0200 |
| commit | 7ab26d51808bd4ffab2510091b062a91cf6a8c81 (patch) | |
| tree | ed68a85260479a165de7312dcccc49310dd0134f /EmbeddedPkg/Include/Guid | |
| parent | bacfd6ed8cea295e2d955d13bcd372499a4c6806 (diff) | |
| download | edk2-7ab26d51808bd4ffab2510091b062a91cf6a8c81.tar.gz edk2-7ab26d51808bd4ffab2510091b062a91cf6a8c81.tar.bz2 edk2-7ab26d51808bd4ffab2510091b062a91cf6a8c81.zip | |
EmbeddedPkg: introduce NvVarStoreFormattedLib
Some platforms don't format a variable store template at build time;
instead they format the non-volatile varstore flash chip during boot,
dynamically. Introduce NvVarStoreFormattedLib to enable such platforms to
delay the "variable read" service drivers until the platform specific
module(s) report that the variable store has been formatted.
The platform-specific module that performs the formatting during startup
is usually an FVB or MM FVB driver. Under the proposed scheme, it becomes
responsible for installing gEdkiiNvVarStoreFormattedGuid with a NULL
interface in the protocol database. In turn, the platform DSC will hook
NvVarStoreFormattedLib into the variable service driver, to make the
latter wait for the FVB driver. Platforms that need not delay the variable
service driver like this may still use the same FVB driver;
gEdkiiNvVarStoreFormattedGuid will simply be ignored.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: Supreeth Venkatesh <Supreeth.Venkatesh@arm.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Diffstat (limited to 'EmbeddedPkg/Include/Guid')
| -rw-r--r-- | EmbeddedPkg/Include/Guid/NvVarStoreFormatted.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/EmbeddedPkg/Include/Guid/NvVarStoreFormatted.h b/EmbeddedPkg/Include/Guid/NvVarStoreFormatted.h new file mode 100644 index 0000000000..4e057e4d89 --- /dev/null +++ b/EmbeddedPkg/Include/Guid/NvVarStoreFormatted.h @@ -0,0 +1,39 @@ +/** @file
+ EDKII NvVarStore Formatted GUID
+
+ A NULL protocol instance with this GUID in the DXE and/or MM protocol
+ databases, and/or a NULL PPI with this GUID in the PPI database, implies that
+ a DXE or MM driver, or a PEIM, has verified (or dynamically ensured) that the
+ non-volatile variable store has valid and consistent headers
+ (EFI_FIRMWARE_VOLUME_HEADER and VARIABLE_STORE_HEADER).
+
+ Said predicate is required by the read-only variable PEIM, and the read side
+ of the runtime variable DXE and MM drivers, immediately after they are
+ dispatched. This GUID presents platforms with one way to coordinate between
+ their module(s) that format the variable store FVB device and the variable
+ service drivers.
+
+ Copyright (C) 2018, Red Hat, Inc.
+
+ This program and the accompanying materials are licensed and made available
+ under the terms and conditions of the BSD License that 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.
+**/
+
+
+#ifndef __EDKII_NV_VAR_STORE_FORMATTED_H__
+#define __EDKII_NV_VAR_STORE_FORMATTED_H__
+
+#define EDKII_NV_VAR_STORE_FORMATTED_GUID \
+ { \
+ 0xd1a86e3f, 0x0707, 0x4c35, \
+ { 0x83, 0xcd, 0xdc, 0x2c, 0x29, 0xc8, 0x91, 0xa3 } \
+ }
+
+extern EFI_GUID gEdkiiNvVarStoreFormattedGuid;
+
+#endif
|