#include <hal.h>
#include <debug.h>

Include dependency graph for memory.c:

Macros
#define	NDEBUG

#define	MM_HAL_HEAP_START (PVOID)(MM_HAL_VA_START + (1024 * 1024))

Functions
ULONG64 NTAPI	HalpAllocPhysicalMemory (IN PLOADER_PARAMETER_BLOCK LoaderBlock, IN ULONG64 MaxAddress, IN PFN_NUMBER PageCount, IN BOOLEAN Aligned)

PVOID NTAPI	HalpMapPhysicalMemory64 (IN PHYSICAL_ADDRESS PhysicalAddress, IN PFN_COUNT PageCount)

VOID NTAPI	HalpUnmapVirtualAddress (IN PVOID VirtualAddress, IN PFN_COUNT PageCount)

PVOID NTAPI	HalpMapPhysicalMemory64Vista (IN PHYSICAL_ADDRESS PhysicalAddress, IN PFN_COUNT PageCount, IN BOOLEAN FlushCurrentTLB)

VOID NTAPI	HalpUnmapVirtualAddressVista (IN PVOID VirtualAddress, IN PFN_COUNT PageCount, IN BOOLEAN FlushCurrentTLB)

Variables
ULONG	HalpUsedAllocDescriptors

MEMORY_ALLOCATION_DESCRIPTOR	HalpAllocationDescriptorArray [64]

PVOID	HalpHeapStart = MM_HAL_HEAP_START

Macro Definition Documentation

◆ MM_HAL_HEAP_START

#define MM_HAL_HEAP_START (PVOID)(MM_HAL_VA_START + (1024 * 1024))

Definition at line 16 of file memory.c.

◆ NDEBUG

#define NDEBUG

Definition at line 12 of file memory.c.

Function Documentation

◆ HalpAllocPhysicalMemory()

ULONG64 NTAPI HalpAllocPhysicalMemory	(	IN PLOADER_PARAMETER_BLOCK	LoaderBlock,
		IN ULONG64	MaxAddress,
		IN PFN_NUMBER	PageCount,
		IN BOOLEAN	Aligned
	)

Definition at line 29 of file memory.c.

{
    ULONG UsedDescriptors;
    ULONG64 PhysicalAddress;
    PFN_NUMBER MaxPage, BasePage, Alignment;
    PLIST_ENTRY NextEntry;
    PMEMORY_ALLOCATION_DESCRIPTOR MdBlock, NewBlock, FreeBlock;
 
    /* Highest page we'll go */
    MaxPage = MaxAddress >> PAGE_SHIFT;
 
    /* We need at least two blocks */
    if ((HalpUsedAllocDescriptors + 2) > 64) return 0;
 
    /* Remember how many we have now */
    UsedDescriptors = HalpUsedAllocDescriptors;
 
    /* Loop the loader block memory descriptors */
    NextEntry = LoaderBlock->MemoryDescriptorListHead.Flink;
    while (NextEntry != &LoaderBlock->MemoryDescriptorListHead)
    {
        /* Get the block */
        MdBlock = CONTAINING_RECORD(NextEntry,
                                    MEMORY_ALLOCATION_DESCRIPTOR,
                                    ListEntry);
 
        /* No alignment by default */
        Alignment = 0;
 
        /* Unless requested, in which case we use a 64KB block alignment */
        if (Aligned) Alignment = ((MdBlock->BasePage + 0x0F) & ~0x0F) - MdBlock->BasePage;
 
        /* Search for free memory */
        if ((MdBlock->MemoryType == LoaderFree) ||
            (MdBlock->MemoryType == LoaderFirmwareTemporary))
        {
            /* Make sure the page is within bounds, including alignment */
            BasePage = MdBlock->BasePage;
            if ((BasePage) &&
                (MdBlock->PageCount >= PageCount + Alignment) &&
                (BasePage + PageCount + Alignment < MaxPage))
            {
                /* We found an address */
                PhysicalAddress = ((ULONG64)BasePage + Alignment) << PAGE_SHIFT;
                break;
            }
        }
 
        /* Keep trying */
        NextEntry = NextEntry->Flink;
    }
 
    /* If we didn't find anything, get out of here */
    if (NextEntry == &LoaderBlock->MemoryDescriptorListHead) return 0;
 
    /* Okay, now get a descriptor */
    NewBlock = &HalpAllocationDescriptorArray[HalpUsedAllocDescriptors];
    NewBlock->PageCount = (ULONG)PageCount;
    NewBlock->BasePage = MdBlock->BasePage + Alignment;
    NewBlock->MemoryType = LoaderHALCachedMemory;
 
    /* Update count */
    UsedDescriptors++;
    HalpUsedAllocDescriptors = UsedDescriptors;
 
    /* Check if we had any alignment */
    if (Alignment)
    {
        /* Check if we had leftovers */
        if (MdBlock->PageCount > (PageCount + Alignment))
        {
            /* Get the next descriptor */
            FreeBlock = &HalpAllocationDescriptorArray[UsedDescriptors];
            FreeBlock->PageCount = MdBlock->PageCount - Alignment - (ULONG)PageCount;
            FreeBlock->BasePage = MdBlock->BasePage + Alignment + (ULONG)PageCount;
 
            /* One more */
            HalpUsedAllocDescriptors++;
 
            /* Insert it into the list */
            InsertHeadList(&MdBlock->ListEntry, &FreeBlock->ListEntry);
        }
 
        /* Trim the original block to the alignment only */
        MdBlock->PageCount = Alignment;
 
        /* Insert the descriptor after the original one */
        InsertHeadList(&MdBlock->ListEntry, &NewBlock->ListEntry);
    }
    else
    {
        /* Consume memory from this block */
        MdBlock->BasePage += (ULONG)PageCount;
        MdBlock->PageCount -= (ULONG)PageCount;
 
        /* Insert the descriptor before the original one */
        InsertTailList(&MdBlock->ListEntry, &NewBlock->ListEntry);
 
        /* Remove the entry if the whole block was allocated */
        if (MdBlock->PageCount == 0) RemoveEntryList(&MdBlock->ListEntry);
    }
 
    /* Return the address */
    return PhysicalAddress;
}

Referenced by HalInitializeBios(), HalpAcpiCopyBiosTable(), HalpAcpiFindRsdtPhase0(), HalpSetupAcpiPhase0(), and HalpSetupPciDeviceForDebugging().

◆ HalpMapPhysicalMemory64()

PVOID NTAPI HalpMapPhysicalMemory64	(	IN PHYSICAL_ADDRESS	PhysicalAddress,
		IN PFN_COUNT	PageCount
	)

Definition at line 140 of file memory.c.

{
    return HalpMapPhysicalMemory64Vista(PhysicalAddress, PageCount, TRUE);
}

Referenced by HalpAcpiCopyBiosTable(), HalpAcpiFindRsdtPhase0(), HalpAcpiGetTableFromBios(), HalpAcpiTableCacheInit(), HalpConfigureDebuggingDevice(), HalpInitializeCmos(), HalpReboot(), HalpRegisterKdSupportFunctions(), HalpSetupAcpiPhase0(), and HalpSetupPciDeviceForDebugging().

◆ HalpMapPhysicalMemory64Vista()

PVOID NTAPI HalpMapPhysicalMemory64Vista	(	IN PHYSICAL_ADDRESS	PhysicalAddress,
		IN PFN_COUNT	PageCount,
		IN BOOLEAN	FlushCurrentTLB
	)

Definition at line 156 of file memory.c.

{
    PHARDWARE_PTE PointerPte;
    PFN_NUMBER UsedPages = 0;
    PVOID VirtualAddress, BaseAddress;
 
    /* Start at the current HAL heap base */
    BaseAddress = HalpHeapStart;
    VirtualAddress = BaseAddress;
 
    /* Loop until we have all the pages required */
    while (UsedPages < PageCount)
    {
        /* If this overflows past the HAL heap, it means there's no space */
        if (VirtualAddress == NULL) return NULL;
 
        /* Get the PTE for this address */
        PointerPte = HalAddressToPte(VirtualAddress);
 
        /* Go to the next page */
        VirtualAddress = (PVOID)((ULONG_PTR)VirtualAddress + PAGE_SIZE);
 
        /* Check if the page is available */
        if (PointerPte->Valid)
        {
            /* PTE has data, skip it and start with a new base address */
            BaseAddress = VirtualAddress;
            UsedPages = 0;
            continue;
        }
 
        /* PTE is available, keep going on this run */
        UsedPages++;
    }
 
    /* Take the base address of the page plus the actual offset in the address */
    VirtualAddress = (PVOID)((ULONG_PTR)BaseAddress +
                             BYTE_OFFSET(PhysicalAddress.LowPart));
 
    /* If we are starting at the heap, move the heap */
    if (BaseAddress == HalpHeapStart)
    {
        /* Past this allocation */
        HalpHeapStart = (PVOID)((ULONG_PTR)BaseAddress + (PageCount * PAGE_SIZE));
    }
 
    /* Loop pages that can be mapped */
    while (UsedPages--)
    {
        /* Fill out the PTE */
        PointerPte = HalAddressToPte(BaseAddress);
        PointerPte->PageFrameNumber = (PFN_NUMBER)(PhysicalAddress.QuadPart >> PAGE_SHIFT);
        PointerPte->Valid = 1;
        PointerPte->Write = 1;
 
        /* Move to the next address */
        PhysicalAddress.QuadPart += PAGE_SIZE;
        BaseAddress = (PVOID)((ULONG_PTR)BaseAddress + PAGE_SIZE);
    }
 
    /* Flush the TLB and return the address */
    if (FlushCurrentTLB)
        HalpFlushTLB();
 
    return VirtualAddress;
}

Referenced by HalpMapPhysicalMemory64(), and HalpRegisterKdSupportFunctions().

◆ HalpUnmapVirtualAddress()

VOID NTAPI HalpUnmapVirtualAddress	(	IN PVOID	VirtualAddress,
		IN PFN_COUNT	PageCount
	)

Definition at line 148 of file memory.c.

{
    HalpUnmapVirtualAddressVista(VirtualAddress, PageCount, TRUE);
}

Referenced by HalpAcpiGetTable(), HalpAcpiGetTableFromBios(), HalpAcpiTableCacheInit(), HalpRegisterKdSupportFunctions(), and HalpReleasePciDeviceForDebugging().

◆ HalpUnmapVirtualAddressVista()

VOID NTAPI HalpUnmapVirtualAddressVista	(	IN PVOID	VirtualAddress,
		IN PFN_COUNT	PageCount,
		IN BOOLEAN	FlushCurrentTLB
	)

Definition at line 227 of file memory.c.

{
    PHARDWARE_PTE PointerPte;
    ULONG i;
 
    /* Only accept valid addresses */
    if (VirtualAddress < (PVOID)MM_HAL_VA_START) return;
 
    /* Align it down to page size */
    VirtualAddress = (PVOID)((ULONG_PTR)VirtualAddress & ~(PAGE_SIZE - 1));
 
    /* Loop PTEs */
    PointerPte = HalAddressToPte(VirtualAddress);
    for (i = 0; i < PageCount; i++)
    {
        *(PULONG)PointerPte = 0;
        PointerPte++;
    }
 
    /* Flush the TLB */
    if (FlushCurrentTLB)
        HalpFlushTLB();
 
    /* Put the heap back */
    if (HalpHeapStart > VirtualAddress) HalpHeapStart = VirtualAddress;
}