xt-sys/exectos
xt-sys/exectos
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Check if new mapping is a subset of an already existing mapping
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This commit is contained in:
Rafal Kupiec 2024-01-22 15:09:03 +01:00
parent c24745d233
commit 8580557985
Signed by: belliash
GPG Key ID: 4E829243E0CFE6B4
1 changed files with 11 additions and 0 deletions
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11
xtldr/memory.c
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@ -339,6 +339,17 @@ BlMapVirtualMemory(IN OUT PXTBL_PAGE_MAPPING PageMap,
Mapping2 = CONTAIN_RECORD(ListEntry, LOADER_MEMORY_MAPPING, ListEntry); Mapping2 = CONTAIN_RECORD(ListEntry, LOADER_MEMORY_MAPPING, ListEntry);
PhysicalAddress2End = (PUINT8)Mapping2->PhysicalAddress + (Mapping2->NumberOfPages * EFI_PAGE_SIZE) - 1 ; PhysicalAddress2End = (PUINT8)Mapping2->PhysicalAddress + (Mapping2->NumberOfPages * EFI_PAGE_SIZE) - 1 ;
/* Check if new mapping is a subset of an existing mapping */
if(Mapping1->PhysicalAddress >= Mapping2->PhysicalAddress && PhysicalAddressEnd <= PhysicalAddress2End)
{
/* Make sure it's memory type is the same */
if(Mapping1->MemoryType == Mapping2->MemoryType)
{
/* It is already mapped */
return STATUS_EFI_SUCCESS;
}
}
/* Check if they overlap */ /* Check if they overlap */
if(PhysicalAddressEnd > Mapping2->PhysicalAddress && PhysicalAddressEnd <= PhysicalAddress2End) if(PhysicalAddressEnd > Mapping2->PhysicalAddress && PhysicalAddressEnd <= PhysicalAddress2End)
{ {