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OvmfPkg/PlatformPei: ScanOrAdd64BitE820Ram improvements 

Add a bool parameter to ScanOrAdd64BitE820Ram to explicitly specify
whenever ScanOrAdd64BitE820Ram should add HOBs for high memory (above
4G) or scan only.

Also add a lowmem parameter so ScanOrAdd64BitE820Ram
can report the memory size below 4G.

This allows a more flexible usage of ScanOrAdd64BitE820Ram,
a followup patch will use it for all memory detection.

No functional change.

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 08:01:44 +01:00 committed by mergify[bot]
parent ec37fd9c1f
commit 557dede8a6
1 changed files with 24 additions and 8 deletions
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32
OvmfPkg/PlatformPei/MemDetect.c
View File

@ -223,6 +223,8 @@ QemuUc32BaseInitialization (
STATIC
EFI_STATUS
ScanOrAdd64BitE820Ram (
IN BOOLEAN AddHighHob,
OUT UINT64 *LowMemory OPTIONAL,
OUT UINT64 *MaxAddress OPTIONAL
)
{
@ -241,6 +243,10 @@ ScanOrAdd64BitE820Ram (
return EFI_PROTOCOL_ERROR;
}
if (LowMemory != NULL) {
*LowMemory = 0;
}
if (MaxAddress != NULL) {
*MaxAddress = BASE_4GB;
}
@ -256,10 +262,8 @@ ScanOrAdd64BitE820Ram (
E820Entry.Length,
E820Entry.Type
));
if ((E820Entry.Type == EfiAcpiAddressRangeMemory) &&
(E820Entry.BaseAddr >= BASE_4GB))
{
if (MaxAddress == NULL) {
if (E820Entry.Type == EfiAcpiAddressRangeMemory) {
if (AddHighHob && (E820Entry.BaseAddr >= BASE_4GB)) {
UINT64 Base;
UINT64 End;
@ -279,11 +283,13 @@ ScanOrAdd64BitE820Ram (
End
));
}
} else {
}
if (MaxAddress || LowMemory) {
UINT64 Candidate;
Candidate = E820Entry.BaseAddr + E820Entry.Length;
if (Candidate > *MaxAddress) {
if (MaxAddress && (Candidate > *MaxAddress)) {
*MaxAddress = Candidate;
DEBUG ((
DEBUG_VERBOSE,
@ -292,6 +298,16 @@ ScanOrAdd64BitE820Ram (
*MaxAddress
));
}
if (LowMemory && (Candidate > *LowMemory) && (Candidate < BASE_4GB)) {
*LowMemory = Candidate;
DEBUG ((
DEBUG_VERBOSE,
"%a: LowMemory=0x%Lx\n",
__FUNCTION__,
*LowMemory
));
}
}
}
}
@ -376,7 +392,7 @@ GetFirstNonAddress (
// Otherwise, get the flat size of the memory above 4GB from the CMOS (which
// can only express a size smaller than 1TB), and add it to 4GB.
//
Status = ScanOrAdd64BitE820Ram (&FirstNonAddress);
Status = ScanOrAdd64BitE820Ram (FALSE, NULL, &FirstNonAddress);
if (EFI_ERROR (Status)) {
FirstNonAddress = BASE_4GB + GetSystemMemorySizeAbove4gb ();
}
@ -809,7 +825,7 @@ QemuInitializeRam (
// entries. Otherwise, create a single memory HOB with the flat >=4GB
// memory size read from the CMOS.
//
Status = ScanOrAdd64BitE820Ram (NULL);
Status = ScanOrAdd64BitE820Ram (TRUE, NULL, NULL);
if (EFI_ERROR (Status) && (UpperMemorySize != 0)) {
AddMemoryBaseSizeHob (BASE_4GB, UpperMemorySize);
}