ArmPkg/Library/DebugUncachedMemoryAllocationLib/DebugUncachedMemoryAllocationLib.c
/** @file
Debug version of the UncachedMemoryAllocation lib that uses the VirtualUncachedPages
protocol, produced by the DXE CPU driver, to produce debuggable uncached memory buffers.
The DMA rules for EFI contain the concept of a PCI (DMA master) address for memory and
a CPU (C code) address for the memory buffer that don't have to be the same. There seem to
be common errors out there with folks mixing up the two addresses. This library causes
the PCI (DMA master) address to not be mapped into system memory so if the CPU (C code)
uses the wrong pointer it will generate a page fault. The CPU (C code) version of the buffer
has a virtual address that does not match the physical address. The virtual address has
PcdArmUncachedMemoryMask ored into the physical address.
Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Base.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UncachedMemoryAllocationLib.h>
#include <Library/PcdLib.h>
#include <Library/ArmLib.h>
#include <Protocol/Cpu.h>
#include <Protocol/VirtualUncachedPages.h>
VOID *
UncachedInternalAllocatePages (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages
);
VOID *
UncachedInternalAllocateAlignedPages (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
IN UINTN Alignment
);
EFI_CPU_ARCH_PROTOCOL *gDebugUncachedCpu;
VIRTUAL_UNCACHED_PAGES_PROTOCOL *gVirtualUncachedPages;
//
// Assume all of memory has the same cache attributes, unless we do our magic
//
UINT64 gAttributes;
typedef struct {
VOID *Buffer;
VOID *Allocation;
UINTN Pages;
LIST_ENTRY Link;
} FREE_PAGE_NODE;
LIST_ENTRY mPageList = INITIALIZE_LIST_HEAD_VARIABLE (mPageList);
VOID
AddPagesToList (
IN VOID *Buffer,
IN VOID *Allocation,
UINTN Pages
)
{
FREE_PAGE_NODE *NewNode;
NewNode = AllocatePool (sizeof (LIST_ENTRY));
if (NewNode == NULL) {
ASSERT (FALSE);
return;
}
NewNode->Buffer = Buffer;
NewNode->Allocation = Allocation;
NewNode->Pages = Pages;
InsertTailList (&mPageList, &NewNode->Link);
}
VOID
RemovePagesFromList (
IN VOID *Buffer,
OUT VOID **Allocation,
OUT UINTN *Pages
)
{
LIST_ENTRY *Link;
FREE_PAGE_NODE *OldNode;
*Allocation = NULL;
*Pages = 0;
for (Link = mPageList.ForwardLink; Link != &mPageList; Link = Link->ForwardLink) {
OldNode = BASE_CR (Link, FREE_PAGE_NODE, Link);
if (OldNode->Buffer == Buffer) {
*Allocation = OldNode->Allocation;
*Pages = OldNode->Pages;
RemoveEntryList (&OldNode->Link);
FreePool (OldNode);
return;
}
}
return;
}
EFI_PHYSICAL_ADDRESS
ConvertToPhysicalAddress (
IN VOID *VirtualAddress
)
{
UINTN UncachedMemoryMask = (UINTN)PcdGet64 (PcdArmUncachedMemoryMask);
UINTN PhysicalAddress;
PhysicalAddress = (UINTN)VirtualAddress & ~UncachedMemoryMask;
return (EFI_PHYSICAL_ADDRESS)PhysicalAddress;
}
VOID *
ConvertToUncachedAddress (
IN VOID *Address
)
{
UINTN UncachedMemoryMask = (UINTN)PcdGet64 (PcdArmUncachedMemoryMask);
UINTN UncachedAddress;
UncachedAddress = (UINTN)Address | UncachedMemoryMask;
return (VOID *)UncachedAddress;
}
VOID *
UncachedInternalAllocatePages (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages
)
{
return UncachedInternalAllocateAlignedPages (MemoryType, Pages, EFI_PAGE_SIZE);
}
VOID *
EFIAPI
UncachedAllocatePages (
IN UINTN Pages
)
{
return UncachedInternalAllocatePages (EfiBootServicesData, Pages);
}
VOID *
EFIAPI
UncachedAllocateRuntimePages (
IN UINTN Pages
)
{
return UncachedInternalAllocatePages (EfiRuntimeServicesData, Pages);
}
VOID *
EFIAPI
UncachedAllocateReservedPages (
IN UINTN Pages
)
{
return UncachedInternalAllocatePages (EfiReservedMemoryType, Pages);
}
VOID
EFIAPI
UncachedFreePages (
IN VOID *Buffer,
IN UINTN Pages
)
{
UncachedFreeAlignedPages (Buffer, Pages);
return;
}
VOID *
UncachedInternalAllocateAlignedPages (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
IN UINTN Alignment
)
{
EFI_STATUS Status;
EFI_PHYSICAL_ADDRESS Memory;
EFI_PHYSICAL_ADDRESS AlignedMemory;
UINTN AlignmentMask;
UINTN UnalignedPages;
UINTN RealPages;
//
// Alignment must be a power of two or zero.
//
ASSERT ((Alignment & (Alignment - 1)) == 0);
if (Pages == 0) {
return NULL;
}
if (Alignment > EFI_PAGE_SIZE) {
//
// Caculate the total number of pages since alignment is larger than page size.
//
AlignmentMask = Alignment - 1;
RealPages = Pages + EFI_SIZE_TO_PAGES (Alignment);
//
// Make sure that Pages plus EFI_SIZE_TO_PAGES (Alignment) does not overflow.
//
ASSERT (RealPages > Pages);
Status = gBS->AllocatePages (AllocateAnyPages, MemoryType, RealPages, &Memory);
if (EFI_ERROR (Status)) {
return NULL;
}
AlignedMemory = ((UINTN) Memory + AlignmentMask) & ~AlignmentMask;
UnalignedPages = EFI_SIZE_TO_PAGES (AlignedMemory - (UINTN) Memory);
if (UnalignedPages > 0) {
//
// Free first unaligned page(s).
//
Status = gBS->FreePages (Memory, UnalignedPages);
ASSERT_EFI_ERROR (Status);
}
Memory = (EFI_PHYSICAL_ADDRESS) (AlignedMemory + EFI_PAGES_TO_SIZE (Pages));
UnalignedPages = RealPages - Pages - UnalignedPages;
if (UnalignedPages > 0) {
//
// Free last unaligned page(s).
//
Status = gBS->FreePages (Memory, UnalignedPages);
ASSERT_EFI_ERROR (Status);
}
} else {
//
// Do not over-allocate pages in this case.
//
Status = gBS->AllocatePages (AllocateAnyPages, MemoryType, Pages, &Memory);
if (EFI_ERROR (Status)) {
return NULL;
}
AlignedMemory = (UINTN) Memory;
}
Status = gVirtualUncachedPages->ConvertPages (gVirtualUncachedPages, AlignedMemory, Pages * EFI_PAGE_SIZE, PcdGet64 (PcdArmUncachedMemoryMask), &gAttributes);
if (EFI_ERROR (Status)) {
return NULL;
}
AlignedMemory = (EFI_PHYSICAL_ADDRESS)(UINTN)ConvertToUncachedAddress ((VOID *)(UINTN)AlignedMemory);
return (VOID *)(UINTN)AlignedMemory;
}
VOID
EFIAPI
UncachedFreeAlignedPages (
IN VOID *Buffer,
IN UINTN Pages
)
{
EFI_STATUS Status;
EFI_PHYSICAL_ADDRESS Memory;
ASSERT (Pages != 0);
Memory = ConvertToPhysicalAddress (Buffer);
Status = gVirtualUncachedPages->RevertPages (gVirtualUncachedPages, Memory, Pages * EFI_PAGE_SIZE, PcdGet64 (PcdArmUncachedMemoryMask), gAttributes);
Status = gBS->FreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) Memory, Pages);
ASSERT_EFI_ERROR (Status);
}
VOID *
UncachedInternalAllocateAlignedPool (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
VOID *AlignedAddress;
//
// Alignment must be a power of two or zero.
//
ASSERT ((Alignment & (Alignment - 1)) == 0);
if (Alignment < EFI_PAGE_SIZE) {
Alignment = EFI_PAGE_SIZE;
}
AlignedAddress = UncachedInternalAllocateAlignedPages (PoolType, EFI_SIZE_TO_PAGES (AllocationSize), Alignment);
if (AlignedAddress == NULL) {
return NULL;
}
AddPagesToList ((VOID *)(UINTN)ConvertToPhysicalAddress (AlignedAddress), (VOID *)(UINTN)AlignedAddress, EFI_SIZE_TO_PAGES (AllocationSize));
return (VOID *) AlignedAddress;
}
VOID *
EFIAPI
UncachedAllocateAlignedPool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return UncachedInternalAllocateAlignedPool (EfiBootServicesData, AllocationSize, Alignment);
}
VOID *
EFIAPI
UncachedAllocateAlignedRuntimePool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return UncachedInternalAllocateAlignedPool (EfiRuntimeServicesData, AllocationSize, Alignment);
}
VOID *
EFIAPI
UncachedAllocateAlignedReservedPool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return UncachedInternalAllocateAlignedPool (EfiReservedMemoryType, AllocationSize, Alignment);
}
VOID *
UncachedInternalAllocateAlignedZeroPool (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
VOID *Memory;
Memory = UncachedInternalAllocateAlignedPool (PoolType, AllocationSize, Alignment);
if (Memory != NULL) {
Memory = ZeroMem (Memory, AllocationSize);
}
return Memory;
}
VOID *
EFIAPI
UncachedAllocateAlignedZeroPool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return UncachedInternalAllocateAlignedZeroPool (EfiBootServicesData, AllocationSize, Alignment);
}
VOID *
EFIAPI
UncachedAllocateAlignedRuntimeZeroPool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return UncachedInternalAllocateAlignedZeroPool (EfiRuntimeServicesData, AllocationSize, Alignment);
}
VOID *
EFIAPI
UncachedAllocateAlignedReservedZeroPool (
IN UINTN AllocationSize,
IN UINTN Alignment
)
{
return UncachedInternalAllocateAlignedZeroPool (EfiReservedMemoryType, AllocationSize, Alignment);
}
VOID *
UncachedInternalAllocateAlignedCopyPool (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN AllocationSize,
IN CONST VOID *Buffer,
IN UINTN Alignment
)
{
VOID *Memory;
ASSERT (Buffer != NULL);
ASSERT (AllocationSize <= (MAX_ADDRESS - (UINTN) Buffer + 1));
Memory = UncachedInternalAllocateAlignedPool (PoolType, AllocationSize, Alignment);
if (Memory != NULL) {
Memory = CopyMem (Memory, Buffer, AllocationSize);
}
return Memory;
}
VOID *
EFIAPI
UncachedAllocateAlignedCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer,
IN UINTN Alignment
)
{
return UncachedInternalAllocateAlignedCopyPool (EfiBootServicesData, AllocationSize, Buffer, Alignment);
}
VOID *
EFIAPI
UncachedAllocateAlignedRuntimeCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer,
IN UINTN Alignment
)
{
return UncachedInternalAllocateAlignedCopyPool (EfiRuntimeServicesData, AllocationSize, Buffer, Alignment);
}
VOID *
EFIAPI
UncachedAllocateAlignedReservedCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer,
IN UINTN Alignment
)
{
return UncachedInternalAllocateAlignedCopyPool (EfiReservedMemoryType, AllocationSize, Buffer, Alignment);
}
VOID
EFIAPI
UncachedFreeAlignedPool (
IN VOID *Buffer
)
{
VOID *Allocation;
UINTN Pages;
RemovePagesFromList (Buffer, &Allocation, &Pages);
UncachedFreePages (Allocation, Pages);
}
VOID *
UncachedInternalAllocatePool (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN AllocationSize
)
{
UINTN CacheLineLength = ArmDataCacheLineLength ();
return UncachedInternalAllocateAlignedPool (MemoryType, AllocationSize, CacheLineLength);
}
VOID *
EFIAPI
UncachedAllocatePool (
IN UINTN AllocationSize
)
{
return UncachedInternalAllocatePool (EfiBootServicesData, AllocationSize);
}
VOID *
EFIAPI
UncachedAllocateRuntimePool (
IN UINTN AllocationSize
)
{
return UncachedInternalAllocatePool (EfiRuntimeServicesData, AllocationSize);
}
VOID *
EFIAPI
UncachedAllocateReservedPool (
IN UINTN AllocationSize
)
{
return UncachedInternalAllocatePool (EfiReservedMemoryType, AllocationSize);
}
VOID *
UncachedInternalAllocateZeroPool (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN AllocationSize
)
{
VOID *Memory;
Memory = UncachedInternalAllocatePool (PoolType, AllocationSize);
if (Memory != NULL) {
Memory = ZeroMem (Memory, AllocationSize);
}
return Memory;
}
VOID *
EFIAPI
UncachedAllocateZeroPool (
IN UINTN AllocationSize
)
{
return UncachedInternalAllocateZeroPool (EfiBootServicesData, AllocationSize);
}
VOID *
EFIAPI
UncachedAllocateRuntimeZeroPool (
IN UINTN AllocationSize
)
{
return UncachedInternalAllocateZeroPool (EfiRuntimeServicesData, AllocationSize);
}
VOID *
EFIAPI
UncachedAllocateReservedZeroPool (
IN UINTN AllocationSize
)
{
return UncachedInternalAllocateZeroPool (EfiReservedMemoryType, AllocationSize);
}
VOID *
UncachedInternalAllocateCopyPool (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN AllocationSize,
IN CONST VOID *Buffer
)
{
VOID *Memory;
ASSERT (Buffer != NULL);
ASSERT (AllocationSize <= (MAX_ADDRESS - (UINTN) Buffer + 1));
Memory = UncachedInternalAllocatePool (PoolType, AllocationSize);
if (Memory != NULL) {
Memory = CopyMem (Memory, Buffer, AllocationSize);
}
return Memory;
}
VOID *
EFIAPI
UncachedAllocateCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer
)
{
return UncachedInternalAllocateCopyPool (EfiBootServicesData, AllocationSize, Buffer);
}
VOID *
EFIAPI
UncachedAllocateRuntimeCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer
)
{
return UncachedInternalAllocateCopyPool (EfiRuntimeServicesData, AllocationSize, Buffer);
}
VOID *
EFIAPI
UncachedAllocateReservedCopyPool (
IN UINTN AllocationSize,
IN CONST VOID *Buffer
)
{
return UncachedInternalAllocateCopyPool (EfiReservedMemoryType, AllocationSize, Buffer);
}
VOID
EFIAPI
UncachedFreePool (
IN VOID *Buffer
)
{
UncachedFreeAlignedPool (Buffer);
}
VOID
EFIAPI
UncachedSafeFreePool (
IN VOID *Buffer
)
{
if (Buffer != NULL) {
UncachedFreePool (Buffer);
Buffer = NULL;
}
}
/**
The constructor function caches the pointer of DXE Services Table.
The constructor function caches the pointer of DXE Services Table.
It will ASSERT() if that operation fails.
It will ASSERT() if the pointer of DXE Services Table is NULL.
It will always return EFI_SUCCESS.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
**/
EFI_STATUS
EFIAPI
DebugUncachedMemoryAllocationLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&gDebugUncachedCpu);
ASSERT_EFI_ERROR(Status);
Status = gBS->LocateProtocol (&gVirtualUncachedPagesProtocolGuid, NULL, (VOID **)&gVirtualUncachedPages);
ASSERT_EFI_ERROR(Status);
return Status;
}