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Optimize to preallocate big bigs to avoid latter allocations. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2131 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
qhuang8 2006-12-22 08:11:47 +00:00
parent 2c0bc1a2cc
commit e2d56e0a59
1 changed files with 19 additions and 10 deletions
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29
EdkModulePkg/Core/DxeIplPeim/Ia32/VirtualMemory.c
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@ -69,12 +69,8 @@ Returns:
PAGE_MAP_AND_DIRECTORY_POINTER *PageMap;
PAGE_MAP_AND_DIRECTORY_POINTER *PageDirectoryPointerEntry;
PAGE_TABLE_ENTRY *PageDirectoryEntry;
//
// By architecture only one PageMapLevel4 exists - so lets allocate storage for it.
//
PageMap = AllocatePages (1);
ASSERT (PageMap != NULL);
UINTN TotalPagesNum;
UINTN BigPageAddress;
//
// Get physical address bits supported.
@ -98,6 +94,19 @@ Returns:
NumberOfPdpEntriesNeeded = 512;
}
//
// Pre-allocate big pages to avoid later allocations.
//
TotalPagesNum = (NumberOfPdpEntriesNeeded + 1) * NumberOfPml4EntriesNeeded + 1;
BigPageAddress = (UINTN) AllocatePages (TotalPagesNum);
ASSERT (BigPageAddress != 0);
//
// By architecture only one PageMapLevel4 exists - so lets allocate storage for it.
//
PageMap = (VOID *) BigPageAddress;
BigPageAddress += EFI_PAGE_SIZE;
PageMapLevel4Entry = PageMap;
PageAddress = 0;
for (IndexOfPml4Entries = 0; IndexOfPml4Entries < NumberOfPml4EntriesNeeded; IndexOfPml4Entries++, PageMapLevel4Entry++) {
@ -105,8 +114,8 @@ Returns:
// Each PML4 entry points to a page of Page Directory Pointer entires.
// So lets allocate space for them and fill them in in the IndexOfPdpEntries loop.
//
PageDirectoryPointerEntry = AllocatePages (1);
ASSERT (PageDirectoryPointerEntry != NULL);
PageDirectoryPointerEntry = (VOID *) BigPageAddress;
BigPageAddress += EFI_PAGE_SIZE;
//
// Make a PML4 Entry
@ -120,8 +129,8 @@ Returns:
// Each Directory Pointer entries points to a page of Page Directory entires.
// So allocate space for them and fill them in in the IndexOfPageDirectoryEntries loop.
//
PageDirectoryEntry = AllocatePages (1);
ASSERT (PageDirectoryEntry != NULL);
PageDirectoryEntry = (VOID *) BigPageAddress;
BigPageAddress += EFI_PAGE_SIZE;
//
// Fill in a Page Directory Pointer Entries