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Enhance BDS to avoid the additional reset when the platform pre-allocated memory is large enough. 

Signed-off-by: niruiyu
Reviewed-by: mdkinney
Reviewed-by: lgao4

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11983 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
niruiyu 2011-07-06 03:23:15 +00:00
parent c3342aa81f
commit a97a859621
1 changed files with 18 additions and 11 deletions
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29
IntelFrameworkModulePkg/Library/GenericBdsLib/BdsMisc.c
View File

@ -1,7 +1,7 @@
/** @file
Misc BDS library function
Copyright (c) 2004 - 2010, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2004 - 2011, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -1096,8 +1096,10 @@ BdsLibGetImageHeader (
}
/**
This routine adjust the memory information for different memory type and
save them into the variables for next boot.
This routine adjusts the memory information for different memory type and
saves them into the variables for next boot. It conditionally resets the
system when the memory information changes. Platform can reserve memory
large enough (125% of actual requirement) to avoid the reset in the first boot.
**/
VOID
BdsSetMemoryTypeInformationVariable (
@ -1131,7 +1133,7 @@ BdsSetMemoryTypeInformationVariable (
}
//
// Only get the the Memory Type Information variable in the boot mode
// Only check the the Memory Type Information variable in the boot mode
// other than BOOT_WITH_DEFAULT_SETTINGS because the Memory Type
// Information is not valid in this boot mode.
//
@ -1185,29 +1187,34 @@ BdsSetMemoryTypeInformationVariable (
for (Index = 0; PreviousMemoryTypeInformation[Index].Type != EfiMaxMemoryType; Index++) {
Current = 0;
for (Index1 = 0; CurrentMemoryTypeInformation[Index1].Type != EfiMaxMemoryType; Index1++) {
if (PreviousMemoryTypeInformation[Index].Type == CurrentMemoryTypeInformation[Index1].Type) {
Current = CurrentMemoryTypeInformation[Index1].NumberOfPages;
break;
}
}
if (CurrentMemoryTypeInformation[Index1].Type == EfiMaxMemoryType) {
continue;
}
//
// Previous is the number of pages pre-allocated
// Current is the number of pages actually needed
//
Previous = PreviousMemoryTypeInformation[Index].NumberOfPages;
Current = CurrentMemoryTypeInformation[Index1].NumberOfPages;
Next = Previous;
//
// Write next varible to 125% * current and Inconsistent Memory Reserved across bootings may lead to S4 fail
//
if (!MemoryTypeInformationVariableExists && Current < Previous) {
Next = Current + (Current >> 2);
if (Current < Previous) {
if (BootMode == BOOT_WITH_DEFAULT_SETTINGS) {
Next = Current + (Current >> 2);
} else if (!MemoryTypeInformationVariableExists) {
Next = MAX (Current + (Current >> 2), Previous);
}
} else if (Current > Previous) {
Next = Current + (Current >> 2);
} else {
Next = Previous;
}
if (Next > 0 && Next < 4) {
Next = 4;