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| author | Laszlo Ersek <lersek@redhat.com> | 2014-03-04 08:02:52 +0000 |
|---|---|---|
| committer | jljusten <jljusten@6f19259b-4bc3-4df7-8a09-765794883524> | 2014-03-04 08:02:52 +0000 |
| commit | 78a38b73c39569aacca5c7a4f44bb896305a301a (patch) | |
| tree | 784caf7cf289885c2b37277cffb86a00aa8f977f /OvmfPkg/PlatformPei/MemDetect.c | |
| parent | e249f906f10f527ba273542a49b64778fd6b4fa2 (diff) | |
| download | edk2-78a38b73c39569aacca5c7a4f44bb896305a301a.tar.gz edk2-78a38b73c39569aacca5c7a4f44bb896305a301a.tar.bz2 edk2-78a38b73c39569aacca5c7a4f44bb896305a301a.zip | |
OvmfPkg: PlatformPei: reserve early page tables on X64
On X64, the reset vector code in
"OvmfPkg/ResetVector/Ia32/PageTables64.asm" identity maps the first 4GB of
RAM for PEI, consuming six frames starting at 8MB.
This range is declared by the PcdOvmfSecPageTablesBase/Size PCDs.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
[jordan.l.justen@intel.com: Move to MemDetect.c; use PCDs]
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15298 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'OvmfPkg/PlatformPei/MemDetect.c')
| -rw-r--r-- | OvmfPkg/PlatformPei/MemDetect.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c index d35ee53c77..37030e6898 100644 --- a/OvmfPkg/PlatformPei/MemDetect.c +++ b/OvmfPkg/PlatformPei/MemDetect.c @@ -203,5 +203,19 @@ InitializeRamRegions ( PcdGet32 (PcdOvmfSecPeiTempRamSize),
EfiACPIMemoryNVS
);
+
+#ifdef MDE_CPU_X64
+ //
+ // Reserve the initial page tables built by the reset vector code.
+ //
+ // Since this memory range will be used by the Reset Vector on S3
+ // resume, it must be reserved as ACPI NVS.
+ //
+ BuildMemoryAllocationHob (
+ (EFI_PHYSICAL_ADDRESS)(UINTN) PcdGet32 (PcdOvmfSecPageTablesBase),
+ (UINT64)(UINTN) PcdGet32 (PcdOvmfSecPageTablesSize),
+ EfiACPIMemoryNVS
+ );
+#endif
}
}
|