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OvmfPkg/PlatformPei: prefer etc/e820 for memory detection 

Prefer the e820 map provided via qemu firmware config interface
for memory detection.  Use rtc cmos only as fallback, which should
be rarely needed these days as qemu supports etc/e820 since 2013.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3593
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
This commit is contained in:
Gerd Hoffmann 2021-12-08 08:01:45 +01:00 committed by mergify[bot]
parent 557dede8a6
commit 759e3c6d21
1 changed files with 14 additions and 5 deletions
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19
OvmfPkg/PlatformPei/MemDetect.c
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@ -320,8 +320,15 @@ GetSystemMemorySizeBelow4gb (
VOID
)
{
UINT8 Cmos0x34;
UINT8 Cmos0x35;
EFI_STATUS Status;
UINT64 LowerMemorySize = 0;
UINT8 Cmos0x34;
UINT8 Cmos0x35;
Status = ScanOrAdd64BitE820Ram (FALSE, &LowerMemorySize, NULL);
if ((Status == EFI_SUCCESS) && (LowerMemorySize > 0)) {
return (UINT32)LowerMemorySize;
}
//
// CMOS 0x34/0x35 specifies the system memory above 16 MB.
@ -776,7 +783,6 @@ QemuInitializeRam (
// Determine total memory size available
//
LowerMemorySize = GetSystemMemorySizeBelow4gb ();
UpperMemorySize = GetSystemMemorySizeAbove4gb ();
if (mBootMode == BOOT_ON_S3_RESUME) {
//
@ -826,8 +832,11 @@ QemuInitializeRam (
// memory size read from the CMOS.
//
Status = ScanOrAdd64BitE820Ram (TRUE, NULL, NULL);
if (EFI_ERROR (Status) && (UpperMemorySize != 0)) {
AddMemoryBaseSizeHob (BASE_4GB, UpperMemorySize);
if (EFI_ERROR (Status)) {
UpperMemorySize = GetSystemMemorySizeAbove4gb ();
if (UpperMemorySize != 0) {
AddMemoryBaseSizeHob (BASE_4GB, UpperMemorySize);
}
}
}