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OvmfPkg/PlatformPei: explain EFI_MEMORY_TYPE_INFORMATION page counts

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Add a code comment that explains the nature of the NumberOfPages field
values. Including this kind of historical information was suggested by
Leif in <https://edk2.groups.io/g/devel/message/55797> (alternative link:
<http://mid.mail-archive.com/20200312104006.GB23627@bivouac.eciton.net>).

Right now, the most recent commit updating the page counts has been commit
991d95636264 ("[...] Update default memory type information to reduce EFI
Memory Map fragmentation.", 2010-07-16).

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Suggested-by: Leif Lindholm <leif@nuviainc.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20200312223555.29267-2-lersek@redhat.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>
This commit is contained in:
Laszlo Ersek 2020-03-12 23:35:54 +01:00 committed by mergify[bot]
parent d42fdd6f83
commit 912718d8c7
1 changed files with 6 additions and 0 deletions
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6
OvmfPkg/PlatformPei/MemTypeInfo.c
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@ -19,6 +19,12 @@
#include "Platform.h" #include "Platform.h"
//
// The NumberOfPages values below are ad-hoc. They are updated sporadically at
// best (please refer to git-blame for past updates). The values capture a set
// of BIN hints that made sense at a particular time, for some (now likely
// unknown) workloads / boot paths.
//
STATIC EFI_MEMORY_TYPE_INFORMATION mDefaultMemoryTypeInformation[] = { STATIC EFI_MEMORY_TYPE_INFORMATION mDefaultMemoryTypeInformation[] = {
{ EfiACPIMemoryNVS, 0x004 }, { EfiACPIMemoryNVS, 0x004 },
{ EfiACPIReclaimMemory, 0x008 }, { EfiACPIReclaimMemory, 0x008 },