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| author | Anthony PERARD <anthony.perard@citrix.com> | 2019-08-13 12:30:48 +0100 |
|---|---|---|
| committer | Laszlo Ersek <lersek@redhat.com> | 2019-08-21 18:03:49 +0200 |
| commit | 3b96221f77f4181524657e145b51fa423f3faebe (patch) | |
| tree | 88f145ad14fd7253f93c9ea99d41a6b4887447cb /OvmfPkg/XenPlatformPei/Cmos.c | |
| parent | c05de360ec614f71716a201760b91ee055a5ff28 (diff) | |
| download | edk2-3b96221f77f4181524657e145b51fa423f3faebe.tar.gz edk2-3b96221f77f4181524657e145b51fa423f3faebe.tar.bz2 edk2-3b96221f77f4181524657e145b51fa423f3faebe.zip | |
OvmfPkg: Introduce XenPlatformPei
Introduce XenPlatformPei, a copy of OvmfPkg/PlatformPei without some
of QEMU specific initialization, Xen does not support QemuFwCfg.
This new module will be adjusted to accommodate Xen PVH.
fw_cfg dependents that have been removed, which are dynamically skipped
when running PlatformPei on Xen:
- GetFirstNonAddress(): controlling the 64-bit PCI MMIO aperture via the
(experimental) "opt/ovmf/X-PciMmio64Mb" file
- GetFirstNonAddress(): honoring the hotplug DIMM area
("etc/reserved-memory-end") in the placement of the 64-bit PCI MMIO
aperture
- NoexecDxeInitialization() is removed, so PcdPropertiesTableEnable and
PcdSetNxForStack are left constant FALSE (not set dynamically from
fw_cfg "opt/ovmf/PcdXxxx")
- MaxCpuCountInitialization(), PublishPeiMemory(): the max CPU count is
not taken from the QemuFwCfgItemSmpCpuCount fw_cfg key;
PcdCpuMaxLogicalProcessorNumber is used intact and
PcdCpuApInitTimeOutInMicroSeconds is never changed or used.
- InitializeXenPlatform(), S3Verification(): S3 is assumed disabled (not
consulting "etc/system-states" via QemuFwCfgS3Enabled()).
- InstallFeatureControlCallback(): the feature control MSR is not set
from "etc/msr_feature_control"
(also removed FeatureControl.c as there is nothing been executed)
Also removed:
- SMRAM/TSEG-related low mem size adjusting (PcdSmmSmramRequire is
assumed FALSE) in PublishPeiMemory(),
- QemuInitializeRam() entirely,
Xen related changes:
- Have removed the module variable mXen, as it should be always true.
- Have the platform PEI initialization fails if Xen has not been
detected.
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190813113119.14804-5-anthony.perard@citrix.com>
Diffstat (limited to 'OvmfPkg/XenPlatformPei/Cmos.c')
| -rw-r--r-- | OvmfPkg/XenPlatformPei/Cmos.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/OvmfPkg/XenPlatformPei/Cmos.c b/OvmfPkg/XenPlatformPei/Cmos.c new file mode 100644 index 0000000000..5d9ee67cd8 --- /dev/null +++ b/OvmfPkg/XenPlatformPei/Cmos.c @@ -0,0 +1,60 @@ +/** @file
+ PC/AT CMOS access routines
+
+ Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2019, Citrix Systems, Inc.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+#include "Cmos.h"
+#include "Library/IoLib.h"
+
+/**
+ Reads 8-bits of CMOS data.
+
+ Reads the 8-bits of CMOS data at the location specified by Index.
+ The 8-bit read value is returned.
+
+ @param Index The CMOS location to read.
+
+ @return The value read.
+
+**/
+UINT8
+EFIAPI
+CmosRead8 (
+ IN UINTN Index
+ )
+{
+ IoWrite8 (0x70, (UINT8) Index);
+ return IoRead8 (0x71);
+}
+
+
+/**
+ Writes 8-bits of CMOS data.
+
+ Writes 8-bits of CMOS data to the location specified by Index
+ with the value specified by Value and returns Value.
+
+ @param Index The CMOS location to write.
+ @param Value The value to write to CMOS.
+
+ @return The value written to CMOS.
+
+**/
+UINT8
+EFIAPI
+CmosWrite8 (
+ IN UINTN Index,
+ IN UINT8 Value
+ )
+{
+ IoWrite8 (0x70, (UINT8) Index);
+ IoWrite8 (0x71, Value);
+ return Value;
+}
+
|