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Parameterize maximum allocation address in hardware pool and scan memory descriptors in reverse
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This commit is contained in:
Aiken Harris
2026-05-12 19:35:06 +02:00
parent 5a92173586
commit 06635ed014
4 changed files with 13 additions and 8 deletions
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16
xtoskrnl/mm/hlpool.cc
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@@ -18,6 +18,9 @@
* @param Aligned
* Specifies whether allocated memory should be aligned to 64k boundary or not.
*
* @param MaximumAddress
* Supplies the maximum acceptable physical address for the allocation.
*
* @param Buffer
* Supplies a buffer that receives the physical address.
*
@@ -29,18 +32,19 @@ XTAPI
XTSTATUS
MM::HardwarePool::AllocateHardwareMemory(IN PFN_NUMBER PageCount,
IN BOOLEAN Aligned,
IN ULONGLONG MaximumAddress,
OUT PPHYSICAL_ADDRESS Buffer)
{
PLOADER_MEMORY_DESCRIPTOR Descriptor, ExtraDescriptor, HardwareDescriptor;
PLIST_ENTRY ListEntry, LoaderMemoryDescriptors;
PFN_NUMBER Alignment, MaxPage;
ULONGLONG PhysicalAddress;
PLIST_ENTRY ListEntry, LoaderMemoryDescriptors;
/* Assume failure */
(*Buffer).QuadPart = 0;
/* Calculate maximum page address */
MaxPage = MM_MAXIMUM_PHYSICAL_ADDRESS >> MM_PAGE_SHIFT;
/* Calculate maximum page address based on the requested limit */
MaxPage = MaximumAddress >> MM_PAGE_SHIFT;
/* Make sure there are at least 2 descriptors available */
if((UsedHardwareAllocationDescriptors + 2) > MM_HARDWARE_ALLOCATION_DESCRIPTORS)
@@ -53,7 +57,7 @@ MM::HardwarePool::AllocateHardwareMemory(IN PFN_NUMBER PageCount,
LoaderMemoryDescriptors = KE::BootInformation::GetMemoryDescriptors();
/* Scan memory descriptors provided by the boot loader */
ListEntry = LoaderMemoryDescriptors->Flink;
ListEntry = LoaderMemoryDescriptors->Blink;
while(ListEntry != LoaderMemoryDescriptors)
{
Descriptor = CONTAIN_RECORD(ListEntry, LOADER_MEMORY_DESCRIPTOR, ListEntry);
@@ -75,8 +79,8 @@ MM::HardwarePool::AllocateHardwareMemory(IN PFN_NUMBER PageCount,
}
}
/* Move to next descriptor */
ListEntry = ListEntry->Flink;
/* Move to previous descriptor */
ListEntry = ListEntry->Blink;
}
/* Make sure we found a descriptor */