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Optimize to preallocate big bigs to avoid latter allocations.

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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 *PageMap;
PAGE_MAP_AND_DIRECTORY_POINTER *PageDirectoryPointerEntry; PAGE_MAP_AND_DIRECTORY_POINTER *PageDirectoryPointerEntry;
PAGE_TABLE_ENTRY *PageDirectoryEntry; PAGE_TABLE_ENTRY *PageDirectoryEntry;
UINTN TotalPagesNum;
// UINTN BigPageAddress;
// By architecture only one PageMapLevel4 exists - so lets allocate storage for it.
//
PageMap = AllocatePages (1);
ASSERT (PageMap != NULL);
// //
// Get physical address bits supported. // Get physical address bits supported.
@@ -98,6 +94,19 @@ Returns:
NumberOfPdpEntriesNeeded = 512; 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; PageMapLevel4Entry = PageMap;
PageAddress = 0; PageAddress = 0;
for (IndexOfPml4Entries = 0; IndexOfPml4Entries < NumberOfPml4EntriesNeeded; IndexOfPml4Entries++, PageMapLevel4Entry++) { for (IndexOfPml4Entries = 0; IndexOfPml4Entries < NumberOfPml4EntriesNeeded; IndexOfPml4Entries++, PageMapLevel4Entry++) {
@@ -105,8 +114,8 @@ Returns:
// Each PML4 entry points to a page of Page Directory Pointer entires. // 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. // So lets allocate space for them and fill them in in the IndexOfPdpEntries loop.
// //
PageDirectoryPointerEntry = AllocatePages (1); PageDirectoryPointerEntry = (VOID *) BigPageAddress;
ASSERT (PageDirectoryPointerEntry != NULL); BigPageAddress += EFI_PAGE_SIZE;
// //
// Make a PML4 Entry // Make a PML4 Entry
@@ -120,8 +129,8 @@ Returns:
// Each Directory Pointer entries points to a page of Page Directory entires. // 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. // So allocate space for them and fill them in in the IndexOfPageDirectoryEntries loop.
// //
PageDirectoryEntry = AllocatePages (1); PageDirectoryEntry = (VOID *) BigPageAddress;
ASSERT (PageDirectoryEntry != NULL); BigPageAddress += EFI_PAGE_SIZE;
// //
// Fill in a Page Directory Pointer Entries // Fill in a Page Directory Pointer Entries