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Refactor real-mode memory allocation and identity mapping for AP trampoline
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This commit is contained in:
Aiken Harris
2026-06-12 13:16:48 +02:00
parent 81c799e590
commit c702152cca
4 changed files with 236 additions and 36 deletions
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41
xtoskrnl/hl/x86/cpu.cc
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@@ -85,9 +85,9 @@ XTAPI
XTSTATUS
HL::Cpu::StartAllProcessors(VOID)
{
ULONG CpuNumber, Index, MaxCpus, SipiVector, Timeout, TrampolineCodeSize, TrampolinePages;
PVOID CpuStructures, TrampolineAddress, TrampolineCode;
ULONG_PTR AllocationSize;
ULONG ApPages, CpuNumber, Index, MaxCpus, SipiVector, Timeout, TrampolineCodeSize;
PVOID ApVirtualAddress, CpuStructures, TrampolineCode;
PHYSICAL_ADDRESS ApPhysicalAddress;
PPROCESSOR_START_BLOCK StartBlock;
PKPROCESSOR_BLOCK ProcessorBlock;
PACPI_SYSTEM_INFO SysInfo;
@@ -136,27 +136,34 @@ HL::Cpu::StartAllProcessors(VOID)
return STATUS_UNSUCCESSFUL;
}
/* Compute trampoline memory allocation size (trampoline + processor start block + temporary stack) */
AllocationSize = TrampolineCodeSize + sizeof(PROCESSOR_START_BLOCK) + 512;
TrampolinePages = (ULONG)(ROUND_UP(AllocationSize, MM_PAGE_SIZE) / MM_PAGE_SIZE);
/* Allocate real mode memory for AP trampoline */
Status = MM::HardwarePool::AllocateRealModeMemory(TrampolinePages, &TrampolineAddress);
/* Allocate low memory for AP trampoline code */
Status = MM::HardwarePool::AllocateLowMemory(&ApPhysicalAddress, &ApVirtualAddress);
if(Status != STATUS_SUCCESS)
{
/* Failed to allocate memory, print error message and return error */
DebugPrint(L"Failed to allocate %lu pages for AP Trampoline!\n", TrampolinePages);
DebugPrint(L"Failed to allocate low memory for AP Trampoline!\n");
return Status;
}
/* Copy trampoline code to low memory */
RTL::Memory::CopyMemory(TrampolineAddress, TrampolineCode, TrampolineCodeSize);
RTL::Memory::CopyMemory(ApVirtualAddress, TrampolineCode, TrampolineCodeSize);
/* Compute number of pages for trampoline */
ApPages = MM::HardwarePool::CalculateRealModeAllocationPages(TrampolineCodeSize);
/* Temporarily identity map trampoline address */
Status = MM::HardwarePool::MapRealModeMemory(ApPhysicalAddress, ApPages);
if(Status != STATUS_SUCCESS)
{
/* Failed to map memory, return error */
return Status;
}
/* Get start block address relative to trampoline address */
StartBlock = (PPROCESSOR_START_BLOCK)((PUCHAR)TrampolineAddress + TrampolineCodeSize);
StartBlock = (PPROCESSOR_START_BLOCK)((PUCHAR)ApVirtualAddress + TrampolineCodeSize);
/* Get SIPI vector */
SipiVector = (ULONG)((ULONG_PTR)TrampolineAddress >> 12);
SipiVector = (ULONG)(ApPhysicalAddress.QuadPart >> 12);
/* Loop over all CPUs */
CpuNumber = 0;
@@ -183,8 +190,8 @@ HL::Cpu::StartAllProcessors(VOID)
Status = MM::KernelPool::AllocateProcessorStructures(&CpuStructures);
if(Status != STATUS_SUCCESS)
{
/* Failed to allocate memory, unmap memory and return error */
MM::HardwarePool::UnmapHardwareMemory(TrampolineAddress, TrampolinePages, TRUE);
/* Failed to allocate memory, unmap temporary identity mapping and return error */
MM::HardwarePool::UnmapRealModeMemory(ApPhysicalAddress, ApPages);
return Status;
}
@@ -242,7 +249,7 @@ HL::Cpu::StartAllProcessors(VOID)
}
}
/* Unmap trampoline memory and return success */
MM::HardwarePool::UnmapHardwareMemory(TrampolineAddress, TrampolinePages, TRUE);
/* Unmap temporary identity mapping and return success */
MM::HardwarePool::UnmapRealModeMemory(ApPhysicalAddress, ApPages);
return STATUS_SUCCESS;
}