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697c02302ff30f2a983a5cf89df19f771360445f
slimbootloader/BootloaderCommonPkg/Library/FullMemoryAllocationLib/Page.c
T
Maurice Ma c6999f497a Initial check-in for Slim Bootloader source
2018-09-13 16:11:07 -07:00

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/** @file
Memory page management functions.
Copyright (c) 2007 - 2017, Intel Corporation. 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 "Imem.h"
#define EFI_DEFAULT_PAGE_ALLOCATION_ALIGNMENT (EFI_PAGE_SIZE)
//
// Entry for tracking the memory regions for each memory type to coalesce similar memory types
//
typedef struct {
EFI_PHYSICAL_ADDRESS BaseAddress;
EFI_PHYSICAL_ADDRESS MaximumAddress;
UINT64 CurrentNumberOfPages;
UINT64 NumberOfPages;
UINTN InformationIndex;
BOOLEAN Special;
BOOLEAN Runtime;
} EFI_MEMORY_TYPE_STATISTICS;
//
// MemoryMap - The current memory map
//
UINTN mMemoryMapKey = 0;
#define MAX_MAP_DEPTH 6
///
/// mMapDepth - depth of new descriptor stack
///
UINTN mMapDepth = 0;
///
/// mMapStack - space to use as temp storage to build new map descriptors
///
MEMORY_MAP mMapStack[MAX_MAP_DEPTH];
UINTN mFreeMapStack = 0;
///
/// This list maintain the free memory map list
///
LIST_ENTRY mFreeMemoryMapEntryList = INITIALIZE_LIST_HEAD_VARIABLE (mFreeMemoryMapEntryList);
CONST EFI_MEMORY_TYPE_STATISTICS mMemoryTypeStatisticsInit[EfiMaxMemoryType + 1] = {
{ 0, 0, 0, 0, EfiMaxMemoryType, TRUE, FALSE }, // EfiReservedMemoryType
{ 0, 0, 0, 0, EfiMaxMemoryType, FALSE, FALSE }, // EfiLoaderCode
{ 0, 0, 0, 0, EfiMaxMemoryType, FALSE, FALSE }, // EfiLoaderData
{ 0, 0, 0, 0, EfiMaxMemoryType, FALSE, FALSE }, // EfiBootServicesCode
{ 0, MAX_ADDRESS, 0, 0, EfiMaxMemoryType, FALSE, FALSE }, // EfiBootServicesData
{ 0, 0, 0, 0, EfiMaxMemoryType, TRUE, TRUE }, // EfiRuntimeServicesCode
{ 0, 0, 0, 0, EfiMaxMemoryType, TRUE, TRUE }, // EfiRuntimeServicesData
{ 0, MAX_ADDRESS, 0, 0, EfiMaxMemoryType, FALSE, FALSE }, // EfiConventionalMemory
{ 0, 0, 0, 0, EfiMaxMemoryType, FALSE, FALSE }, // EfiUnusableMemory
{ 0, 0, 0, 0, EfiMaxMemoryType, TRUE, FALSE }, // EfiACPIReclaimMemory
{ 0, 0, 0, 0, EfiMaxMemoryType, TRUE, FALSE }, // EfiACPIMemoryNVS
{ 0, 0, 0, 0, EfiMaxMemoryType, FALSE, FALSE }, // EfiMemoryMappedIO
{ 0, 0, 0, 0, EfiMaxMemoryType, FALSE, FALSE }, // EfiMemoryMappedIOPortSpace
{ 0, 0, 0, 0, EfiMaxMemoryType, TRUE, TRUE }, // EfiPalCode
{ 0, 0, 0, 0, EfiMaxMemoryType, FALSE, FALSE }, // EfiPersistentMemory
{ 0, 0, 0, 0, EfiMaxMemoryType, FALSE, FALSE } // EfiMaxMemoryType
};
EFI_MEMORY_TYPE_STATISTICS mMemoryTypeStatistics[EfiMaxMemoryType + 1];
/**
Called to initialize the Pages.
**/
VOID
CoreInitializePages (
VOID
)
{
mMemoryMapKey = 0;
mMapDepth = 0;
mFreeMapStack = 0;
InitializeListHead (&mFreeMemoryMapEntryList);
InitializeListHead (&gMemoryMap);
CopyMem (mMemoryTypeStatistics, mMemoryTypeStatisticsInit, sizeof (mMemoryTypeStatistics));
}
/**
Enter critical section by gaining lock on gMemoryLock.
**/
VOID
CoreAcquireMemoryLock (
VOID
)
{
CoreAcquireLock (&gMemoryLock);
}
/**
Exit critical section by releasing lock on gMemoryLock.
**/
VOID
CoreReleaseMemoryLock (
VOID
)
{
CoreReleaseLock (&gMemoryLock);
}
/**
Internal function. Removes a descriptor entry.
@param Entry The entry to remove
**/
VOID
RemoveMemoryMapEntry (
IN OUT MEMORY_MAP *Entry
)
{
RemoveEntryList (&Entry->Link);
Entry->Link.ForwardLink = NULL;
if (Entry->FromPages) {
//
// Insert the free memory map descriptor to the end of mFreeMemoryMapEntryList
//
InsertTailList (&mFreeMemoryMapEntryList, &Entry->Link);
}
}
/**
Internal function. Adds a ranges to the memory map.
The range must not already exist in the map.
@param Type The type of memory range to add
@param Start The starting address in the memory range Must be
paged aligned
@param End The last address in the range Must be the last
byte of a page
@param Attribute The attributes of the memory range to add
**/
VOID
CoreAddRange (
IN EFI_MEMORY_TYPE Type,
IN EFI_PHYSICAL_ADDRESS Start,
IN EFI_PHYSICAL_ADDRESS End,
IN UINT64 Attribute
)
{
LIST_ENTRY *Link;
MEMORY_MAP *Entry;
ASSERT ((Start & EFI_PAGE_MASK) == 0);
ASSERT (End > Start) ;
ASSERT_LOCKED (&gMemoryLock);
DEBUG ((DEBUG_PAGE, "AddRange: %lx-%lx to %d\n", Start, End, Type));
//
// If memory of type EfiConventionalMemory is being added that includes the page
// starting at address 0, then zero the page starting at address 0. This has
// two benifits. It helps find NULL pointer bugs and it also maximizes
// compatibility with operating systems that may evaluate memory in this page
// for legacy data structures. If memory of any other type is added starting
// at address 0, then do not zero the page at address 0 because the page is being
// used for other purposes.
//
if (Type == EfiConventionalMemory && Start == 0 && (End >= EFI_PAGE_SIZE - 1)) {
SetMem ((VOID *) (UINTN)Start, EFI_PAGE_SIZE, 0);
}
//
// Memory map being altered so updated key
//
mMemoryMapKey += 1;
//
// Look for adjoining memory descriptor
//
// Two memory descriptors can only be merged if they have the same Type
// and the same Attribute
//
Link = gMemoryMap.ForwardLink;
while (Link != &gMemoryMap) {
Entry = CR (Link, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
Link = Link->ForwardLink;
if (Entry->Type != Type) {
continue;
}
if (Entry->Attribute != Attribute) {
continue;
}
if (Entry->End + 1 == Start) {
Start = Entry->Start;
RemoveMemoryMapEntry (Entry);
} else if (Entry->Start == End + 1) {
End = Entry->End;
RemoveMemoryMapEntry (Entry);
}
}
//
// Add descriptor
//
mMapStack[mMapDepth].Signature = MEMORY_MAP_SIGNATURE;
mMapStack[mMapDepth].FromPages = FALSE;
mMapStack[mMapDepth].Type = Type;
mMapStack[mMapDepth].Start = Start;
mMapStack[mMapDepth].End = End;
mMapStack[mMapDepth].VirtualStart = 0;
mMapStack[mMapDepth].Attribute = Attribute;
InsertTailList (&gMemoryMap, &mMapStack[mMapDepth].Link);
mMapDepth += 1;
ASSERT (mMapDepth < MAX_MAP_DEPTH);
return ;
}
/**
Internal function. Deque a descriptor entry from the mFreeMemoryMapEntryList.
If the list is emtry, then allocate a new page to refuel the list.
Please Note this algorithm to allocate the memory map descriptor has a property
that the memory allocated for memory entries always grows, and will never really be freed
For example, if the current boot uses 2000 memory map entries at the maximum point, but
ends up with only 50 at the time the OS is booted, then the memory associated with the 1950
memory map entries is still allocated from EfiBootServicesMemory.
@return The Memory map descriptor dequed from the mFreeMemoryMapEntryList
**/
MEMORY_MAP *
AllocateMemoryMapEntry (
VOID
)
{
MEMORY_MAP *FreeDescriptorEntries;
MEMORY_MAP *Entry;
UINTN Index;
if (IsListEmpty (&mFreeMemoryMapEntryList)) {
//
// The list is empty, to allocate one page to refuel the list
//
FreeDescriptorEntries = CoreAllocatePoolPages (EfiBootServicesData, EFI_SIZE_TO_PAGES (DEFAULT_PAGE_ALLOCATION),
DEFAULT_PAGE_ALLOCATION);
if (FreeDescriptorEntries != NULL) {
//
// Enque the free memmory map entries into the list
//
for (Index = 0; Index < DEFAULT_PAGE_ALLOCATION / sizeof (MEMORY_MAP); Index++) {
FreeDescriptorEntries[Index].Signature = MEMORY_MAP_SIGNATURE;
InsertTailList (&mFreeMemoryMapEntryList, &FreeDescriptorEntries[Index].Link);
}
} else {
return NULL;
}
}
//
// dequeue the first descriptor from the list
//
Entry = CR (mFreeMemoryMapEntryList.ForwardLink, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
RemoveEntryList (&Entry->Link);
return Entry;
}
/**
Internal function. Moves any memory descriptors that are on the
temporary descriptor stack to heap.
**/
VOID
CoreFreeMemoryMapStack (
VOID
)
{
MEMORY_MAP *Entry;
MEMORY_MAP *Entry2;
LIST_ENTRY *Link2;
ASSERT_LOCKED (&gMemoryLock);
//
// If already freeing the map stack, then return
//
if (mFreeMapStack != 0) {
return ;
}
//
// Move the temporary memory descriptor stack into pool
//
mFreeMapStack += 1;
while (mMapDepth != 0) {
//
// Deque an memory map entry from mFreeMemoryMapEntryList
//
Entry = AllocateMemoryMapEntry ();
ASSERT (Entry);
//
// Update to proper entry
//
mMapDepth -= 1;
if (mMapStack[mMapDepth].Link.ForwardLink != NULL) {
//
// Move this entry to general memory
//
RemoveEntryList (&mMapStack[mMapDepth].Link);
mMapStack[mMapDepth].Link.ForwardLink = NULL;
CopyMem (Entry, &mMapStack[mMapDepth], sizeof (MEMORY_MAP));
Entry->FromPages = TRUE;
//
// Find insertion location
//
for (Link2 = gMemoryMap.ForwardLink; Link2 != &gMemoryMap; Link2 = Link2->ForwardLink) {
Entry2 = CR (Link2, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
if (Entry2->FromPages && Entry2->Start > Entry->Start) {
break;
}
}
InsertTailList (Link2, &Entry->Link);
} else {
//
// This item of mMapStack[mMapDepth] has already been dequeued from gMemoryMap list,
// so here no need to move it to memory.
//
InsertTailList (&mFreeMemoryMapEntryList, &Entry->Link);
}
}
mFreeMapStack -= 1;
}
/**
Called to initialize the memory map and add descriptors to
the current descriptor list.
The first descriptor that is added must be general usable
memory as the addition allocates heap.
@param Type The type of memory to add
@param Start The starting address in the memory range Must be
page aligned
@param NumberOfPages The number of pages in the range
@param Attribute Attributes of the memory to add
@return None. The range is added to the memory map
**/
VOID
CoreAddMemoryDescriptor (
IN EFI_MEMORY_TYPE Type,
IN EFI_PHYSICAL_ADDRESS Start,
IN UINT64 NumberOfPages,
IN UINT64 Attribute
)
{
EFI_PHYSICAL_ADDRESS End;
if ((Start & EFI_PAGE_MASK) != 0) {
return;
}
if (Type >= EfiMaxMemoryType && Type < MEMORY_TYPE_OEM_RESERVED_MIN) {
return;
}
CoreAcquireMemoryLock ();
End = Start + LShiftU64 (NumberOfPages, EFI_PAGE_SHIFT) - 1;
CoreAddRange (EfiConventionalMemory, Start, End, Attribute);
mMemoryTypeStatistics[Type].BaseAddress = Start;
mMemoryTypeStatistics[Type].MaximumAddress = End;
mMemoryTypeStatistics[Type].NumberOfPages = NumberOfPages;
CoreFreeMemoryMapStack ();
CoreReleaseMemoryLock ();
}
/**
Internal function. Converts a memory range to the specified type or attributes.
The range must exist in the memory map. Either ChangingType or
ChangingAttributes must be set, but not both.
@param Start The first address of the range Must be page
aligned
@param NumberOfPages The number of pages to convert
@param ChangingType Boolean indicating that type value should be changed
@param NewType The new type for the memory range
@param ChangingAttributes Boolean indicating that attributes value should be changed
@param NewAttributes The new attributes for the memory range
@retval EFI_INVALID_PARAMETER Invalid parameter
@retval EFI_NOT_FOUND Could not find a descriptor cover the specified
range or convertion not allowed.
@retval EFI_SUCCESS Successfully converts the memory range to the
specified type.
**/
EFI_STATUS
CoreConvertPagesEx (
IN UINT64 Start,
IN UINT64 NumberOfPages,
IN BOOLEAN ChangingType,
IN EFI_MEMORY_TYPE NewType,
IN BOOLEAN ChangingAttributes,
IN UINT64 NewAttributes
)
{
UINT64 NumberOfBytes;
UINT64 End;
UINT64 RangeEnd;
UINT64 Attribute;
EFI_MEMORY_TYPE MemType;
LIST_ENTRY *Link;
MEMORY_MAP *Entry;
Entry = NULL;
NumberOfBytes = LShiftU64 (NumberOfPages, EFI_PAGE_SHIFT);
End = Start + NumberOfBytes - 1;
ASSERT (NumberOfPages);
ASSERT ((Start & EFI_PAGE_MASK) == 0);
ASSERT (End > Start) ;
ASSERT_LOCKED (&gMemoryLock);
ASSERT ( (ChangingType == FALSE) || (ChangingAttributes == FALSE) );
if (NumberOfPages == 0 || ((Start & EFI_PAGE_MASK) != 0) || (Start >= End)) {
return EFI_INVALID_PARAMETER;
}
//
// Convert the entire range
//
while (Start < End) {
//
// Find the entry that the covers the range
//
for (Link = gMemoryMap.ForwardLink; Link != &gMemoryMap; Link = Link->ForwardLink) {
Entry = CR (Link, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
if (Entry->Start <= Start && Entry->End > Start) {
break;
}
}
if (Link == &gMemoryMap) {
DEBUG ((DEBUG_ERROR | DEBUG_PAGE, "ConvertPages: failed to find range %lx - %lx\n", Start, End));
return EFI_NOT_FOUND;
}
//
// Convert range to the end, or to the end of the descriptor
// if that's all we've got
//
RangeEnd = End;
ASSERT (Entry != NULL);
if (Entry->End < End) {
RangeEnd = Entry->End;
}
if (ChangingType) {
DEBUG ((DEBUG_PAGE, "ConvertRange: %lx-%lx to type %d\n", Start, RangeEnd, NewType));
}
if (ChangingAttributes) {
DEBUG ((DEBUG_PAGE, "ConvertRange: %lx-%lx to attr %lx\n", Start, RangeEnd, NewAttributes));
}
if (ChangingType) {
//
// Debug code - verify conversion is allowed
//
if (! (NewType == EfiConventionalMemory ? 1 : 0) ^ (Entry->Type == EfiConventionalMemory ? 1 : 0)) {
DEBUG ((DEBUG_ERROR | DEBUG_PAGE, "ConvertPages: Incompatible memory types\n"));
return EFI_NOT_FOUND;
}
//
// Update counters for the number of pages allocated to each memory type
//
if ((UINT32)Entry->Type < EfiMaxMemoryType) {
if (Start >= mMemoryTypeStatistics[Entry->Type].BaseAddress
&& Start <= mMemoryTypeStatistics[Entry->Type].MaximumAddress) {
if (NumberOfPages > mMemoryTypeStatistics[Entry->Type].CurrentNumberOfPages) {
mMemoryTypeStatistics[Entry->Type].CurrentNumberOfPages = 0;
} else {
mMemoryTypeStatistics[Entry->Type].CurrentNumberOfPages -= NumberOfPages;
}
}
}
if ((UINT32)NewType < EfiMaxMemoryType) {
if (Start >= mMemoryTypeStatistics[NewType].BaseAddress && Start <= mMemoryTypeStatistics[NewType].MaximumAddress) {
mMemoryTypeStatistics[NewType].CurrentNumberOfPages += NumberOfPages;
}
}
}
//
// Pull range out of descriptor
//
if (Entry->Start == Start) {
//
// Clip start
//
Entry->Start = RangeEnd + 1;
} else if (Entry->End == RangeEnd) {
//
// Clip end
//
Entry->End = Start - 1;
} else {
//
// Pull it out of the center, clip current
//
//
// Add a new one
//
mMapStack[mMapDepth].Signature = MEMORY_MAP_SIGNATURE;
mMapStack[mMapDepth].FromPages = FALSE;
mMapStack[mMapDepth].Type = Entry->Type;
mMapStack[mMapDepth].Start = RangeEnd + 1;
mMapStack[mMapDepth].End = Entry->End;
//
// Inherit Attribute from the Memory Descriptor that is being clipped
//
mMapStack[mMapDepth].Attribute = Entry->Attribute;
Entry->End = Start - 1;
ASSERT (Entry->Start < Entry->End);
Entry = &mMapStack[mMapDepth];
InsertTailList (&gMemoryMap, &Entry->Link);
mMapDepth += 1;
ASSERT (mMapDepth < MAX_MAP_DEPTH);
}
//
// The new range inherits the same Attribute as the Entry
// it is being cut out of unless attributes are being changed
//
if (ChangingType) {
Attribute = Entry->Attribute;
MemType = NewType;
} else {
Attribute = NewAttributes;
MemType = Entry->Type;
}
//
// If the descriptor is empty, then remove it from the map
//
if (Entry->Start == Entry->End + 1) {
RemoveMemoryMapEntry (Entry);
Entry = NULL;
}
//
// Add our new range in
//
CoreAddRange (MemType, Start, RangeEnd, Attribute);
if (ChangingType && (MemType == EfiConventionalMemory)) {
//
// Avoid calling DEBUG_CLEAR_MEMORY() for an address of 0 because this
// macro will ASSERT() if address is 0. Instead, CoreAddRange() guarantees
// that the page starting at address 0 is always filled with zeros.
//
if (Start == 0) {
if (RangeEnd > EFI_PAGE_SIZE) {
DEBUG_CLEAR_MEMORY ((VOID *) (UINTN) EFI_PAGE_SIZE, (UINTN) (RangeEnd - EFI_PAGE_SIZE + 1));
}
} else {
DEBUG_CLEAR_MEMORY ((VOID *) (UINTN) Start, (UINTN) (RangeEnd - Start + 1));
}
}
//
// Move any map descriptor stack to general pool
//
CoreFreeMemoryMapStack ();
//
// Bump the starting address, and convert the next range
//
Start = RangeEnd + 1;
}
//
// Converted the whole range, done
//
return EFI_SUCCESS;
}
/**
Internal function. Converts a memory range to the specified type.
The range must exist in the memory map.
@param Start The first address of the range Must be page
aligned
@param NumberOfPages The number of pages to convert
@param NewType The new type for the memory range
@retval EFI_INVALID_PARAMETER Invalid parameter
@retval EFI_NOT_FOUND Could not find a descriptor cover the specified
range or convertion not allowed.
@retval EFI_SUCCESS Successfully converts the memory range to the
specified type.
**/
EFI_STATUS
CoreConvertPages (
IN UINT64 Start,
IN UINT64 NumberOfPages,
IN EFI_MEMORY_TYPE NewType
)
{
return CoreConvertPagesEx (Start, NumberOfPages, TRUE, NewType, FALSE, 0);
}
/**
Internal function. Finds a consecutive free page range below
the requested address.
@param MaxAddress The address that the range must be below
@param MinAddress The address that the range must be above
@param NumberOfPages Number of pages needed
@param NewType The type of memory the range is going to be
turned into
@param Alignment Bits to align with
@return The base address of the range, or 0 if the range was not found
**/
UINT64
CoreFindFreePagesI (
IN UINT64 MaxAddress,
IN UINT64 MinAddress,
IN UINT64 NumberOfPages,
IN EFI_MEMORY_TYPE NewType,
IN UINTN Alignment
)
{
UINT64 NumberOfBytes;
UINT64 Target;
UINT64 DescStart;
UINT64 DescEnd;
UINT64 DescNumberOfBytes;
LIST_ENTRY *Link;
MEMORY_MAP *Entry;
if ((MaxAddress < EFI_PAGE_MASK) || (NumberOfPages == 0)) {
return 0;
}
if ((MaxAddress & EFI_PAGE_MASK) != EFI_PAGE_MASK) {
//
// If MaxAddress is not aligned to the end of a page
//
//
// Change MaxAddress to be 1 page lower
//
MaxAddress -= (EFI_PAGE_MASK + 1);
//
// Set MaxAddress to a page boundary
//
MaxAddress &= ~ (UINT64)EFI_PAGE_MASK;
//
// Set MaxAddress to end of the page
//
MaxAddress |= EFI_PAGE_MASK;
}
NumberOfBytes = LShiftU64 (NumberOfPages, EFI_PAGE_SHIFT);
Target = 0;
for (Link = gMemoryMap.ForwardLink; Link != &gMemoryMap; Link = Link->ForwardLink) {
Entry = CR (Link, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
//
// If it's not a free entry, don't bother with it
//
if (Entry->Type != EfiConventionalMemory) {
continue;
}
DescStart = Entry->Start;
DescEnd = Entry->End;
//
// If desc is past max allowed address or below min allowed address, skip it
//
if ((DescStart >= MaxAddress) || (DescEnd < MinAddress)) {
continue;
}
//
// If desc ends past max allowed address, clip the end
//
if (DescEnd >= MaxAddress) {
DescEnd = MaxAddress;
}
DescEnd = ((DescEnd + 1) & (~ (Alignment - 1))) - 1;
// Skip if DescEnd is less than DescStart after alignment clipping
if (DescEnd < DescStart) {
continue;
}
//
// Compute the number of bytes we can used from this
// descriptor, and see it's enough to satisfy the request
//
DescNumberOfBytes = DescEnd - DescStart + 1;
if (DescNumberOfBytes >= NumberOfBytes) {
//
// If the start of the allocated range is below the min address allowed, skip it
//
if ((DescEnd - NumberOfBytes + 1) < MinAddress) {
continue;
}
//
// If this is the best match so far remember it
//
if (DescEnd > Target) {
Target = DescEnd;
}
}
}
//
// If this is a grow down, adjust target to be the allocation base
//
Target -= NumberOfBytes - 1;
//
// If we didn't find a match, return 0
//
if ((Target & EFI_PAGE_MASK) != 0) {
return 0;
}
return Target;
}
/**
Internal function. Finds a consecutive free page range below
the requested address
@param MaxAddress The address that the range must be below
@param NoPages Number of pages needed
@param NewType The type of memory the range is going to be
turned into
@param Alignment Bits to align with
@return The base address of the range, or 0 if the range was not found.
**/
UINT64
FindFreePages (
IN UINT64 MaxAddress,
IN UINT64 NoPages,
IN EFI_MEMORY_TYPE NewType,
IN UINTN Alignment
)
{
UINT64 Start;
//
// Attempt to find free pages in the preferred bin based on the requested memory type
//
if ((UINT32)NewType < EfiMaxMemoryType && MaxAddress >= mMemoryTypeStatistics[NewType].MaximumAddress) {
Start = CoreFindFreePagesI (
mMemoryTypeStatistics[NewType].MaximumAddress,
mMemoryTypeStatistics[NewType].BaseAddress,
NoPages,
NewType,
Alignment
);
if (Start != 0) {
return Start;
}
}
//
// No enough resource
//
return 0;
}
/**
Allocates pages from the memory map.
@param Type The type of allocation to perform
@param MemoryType The type of memory to turn the allocated pages
into
@param NumberOfPages The number of pages to allocate
@param Memory A pointer to receive the base allocated memory
address
@return Status. On success, Memory is filled in with the base address allocated
@retval EFI_INVALID_PARAMETER Parameters violate checking rules defined in
spec.
@retval EFI_NOT_FOUND Could not allocate pages match the requirement.
@retval EFI_OUT_OF_RESOURCES No enough pages to allocate.
@retval EFI_SUCCESS Pages successfully allocated.
**/
EFI_STATUS
EFIAPI
CoreInternalAllocatePages (
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN NumberOfPages,
IN OUT EFI_PHYSICAL_ADDRESS *Memory
)
{
EFI_STATUS Status;
UINT64 Start;
UINT64 NumberOfBytes;
UINT64 End;
UINT64 MaxAddress;
UINTN Alignment;
if ((UINT32)Type >= MaxAllocateType) {
return EFI_INVALID_PARAMETER;
}
if ((MemoryType >= EfiMaxMemoryType && MemoryType < MEMORY_TYPE_OEM_RESERVED_MIN) ||
(MemoryType == EfiConventionalMemory) || (MemoryType == EfiPersistentMemory)) {
return EFI_INVALID_PARAMETER;
}
if (Memory == NULL) {
return EFI_INVALID_PARAMETER;
}
Alignment = EFI_DEFAULT_PAGE_ALLOCATION_ALIGNMENT;
if (MemoryType == EfiACPIReclaimMemory ||
MemoryType == EfiACPIMemoryNVS ||
MemoryType == EfiRuntimeServicesCode ||
MemoryType == EfiRuntimeServicesData) {
Alignment = EFI_ACPI_RUNTIME_PAGE_ALLOCATION_ALIGNMENT;
}
if (Type == AllocateAddress) {
if ((*Memory & (Alignment - 1)) != 0) {
return EFI_NOT_FOUND;
}
}
NumberOfPages += EFI_SIZE_TO_PAGES (Alignment) - 1;
NumberOfPages &= ~ (EFI_SIZE_TO_PAGES (Alignment) - 1);
//
// If this is for below a particular address, then
//
Start = *Memory;
//
// The max address is the max natively addressable address for the processor
//
MaxAddress = MAX_ADDRESS;
//
// Check for Type AllocateAddress,
// if NumberOfPages is 0 or
// if (NumberOfPages << EFI_PAGE_SHIFT) is above MAX_ADDRESS or
// if (Start + NumberOfBytes) rolls over 0 or
// if Start is above MAX_ADDRESS or
// if End is above MAX_ADDRESS,
// return EFI_NOT_FOUND.
//
if (Type == AllocateAddress) {
if ((NumberOfPages == 0) ||
(NumberOfPages > RShiftU64 (MaxAddress, EFI_PAGE_SHIFT))) {
return EFI_NOT_FOUND;
}
NumberOfBytes = LShiftU64 (NumberOfPages, EFI_PAGE_SHIFT);
End = Start + NumberOfBytes - 1;
if ((Start >= End) ||
(Start > MaxAddress) ||
(End > MaxAddress)) {
return EFI_NOT_FOUND;
}
}
if (Type == AllocateMaxAddress) {
MaxAddress = Start;
}
CoreAcquireMemoryLock ();
//
// If not a specific address, then find an address to allocate
//
if (Type != AllocateAddress) {
Start = FindFreePages (MaxAddress, NumberOfPages, MemoryType, Alignment);
if (Start == 0) {
Status = EFI_OUT_OF_RESOURCES;
goto Done;
}
}
//
// Convert pages from FreeMemory to the requested type
//
Status = CoreConvertPages (Start, NumberOfPages, MemoryType);
Done:
CoreReleaseMemoryLock ();
if (!EFI_ERROR (Status)) {
*Memory = Start;
}
return Status;
}
/**
Allocates pages from the memory map.
@param Type The type of allocation to perform
@param MemoryType The type of memory to turn the allocated pages
into
@param NumberOfPages The number of pages to allocate
@param Memory A pointer to receive the base allocated memory
address
@return Status. On success, Memory is filled in with the base address allocated
@retval EFI_INVALID_PARAMETER Parameters violate checking rules defined in
spec.
@retval EFI_NOT_FOUND Could not allocate pages match the requirement.
@retval EFI_OUT_OF_RESOURCES No enough pages to allocate.
@retval EFI_SUCCESS Pages successfully allocated.
**/
EFI_STATUS
EFIAPI
CoreAllocatePages (
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN NumberOfPages,
OUT EFI_PHYSICAL_ADDRESS *Memory
)
{
EFI_STATUS Status;
Status = CoreInternalAllocatePages (Type, MemoryType, NumberOfPages, Memory);
return Status;
}
/**
Frees previous allocated pages.
@param Memory Base address of memory being freed
@param NumberOfPages The number of pages to free
@param MemoryType Pointer to memory type
@retval EFI_NOT_FOUND Could not find the entry that covers the range
@retval EFI_INVALID_PARAMETER Address not aligned
@return EFI_SUCCESS -Pages successfully freed.
**/
EFI_STATUS
EFIAPI
CoreInternalFreePages (
IN EFI_PHYSICAL_ADDRESS Memory,
IN UINTN NumberOfPages,
OUT EFI_MEMORY_TYPE *MemoryType OPTIONAL
)
{
EFI_STATUS Status;
LIST_ENTRY *Link;
MEMORY_MAP *Entry;
UINTN Alignment;
//
// Free the range
//
CoreAcquireMemoryLock ();
//
// Find the entry that the covers the range
//
Entry = NULL;
for (Link = gMemoryMap.ForwardLink; Link != &gMemoryMap; Link = Link->ForwardLink) {
Entry = CR (Link, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
if (Entry->Start <= Memory && Entry->End > Memory) {
break;
}
}
if (Link == &gMemoryMap) {
Status = EFI_NOT_FOUND;
goto Done;
}
Alignment = EFI_DEFAULT_PAGE_ALLOCATION_ALIGNMENT;
ASSERT (Entry != NULL);
if (Entry->Type == EfiACPIReclaimMemory ||
Entry->Type == EfiACPIMemoryNVS ||
Entry->Type == EfiRuntimeServicesCode ||
Entry->Type == EfiRuntimeServicesData) {
Alignment = EFI_ACPI_RUNTIME_PAGE_ALLOCATION_ALIGNMENT;
}
if ((Memory & (Alignment - 1)) != 0) {
Status = EFI_INVALID_PARAMETER;
goto Done;
}
NumberOfPages += EFI_SIZE_TO_PAGES (Alignment) - 1;
NumberOfPages &= ~ (EFI_SIZE_TO_PAGES (Alignment) - 1);
if (MemoryType != NULL) {
*MemoryType = Entry->Type;
}
Status = CoreConvertPages (Memory, NumberOfPages, EfiConventionalMemory);
if (EFI_ERROR (Status)) {
goto Done;
}
Done:
CoreReleaseMemoryLock ();
return Status;
}
/**
Frees previous allocated pages.
@param Memory Base address of memory being freed
@param NumberOfPages The number of pages to free
@retval EFI_NOT_FOUND Could not find the entry that covers the range
@retval EFI_INVALID_PARAMETER Address not aligned
@return EFI_SUCCESS -Pages successfully freed.
**/
EFI_STATUS
EFIAPI
CoreFreePages (
IN EFI_PHYSICAL_ADDRESS Memory,
IN UINTN NumberOfPages
)
{
EFI_STATUS Status;
EFI_MEMORY_TYPE MemoryType;
Status = CoreInternalFreePages (Memory, NumberOfPages, &MemoryType);
return Status;
}
/**
Internal function. Used by the pool functions to allocate pages
to back pool allocation requests.
@param PoolType The type of memory for the new pool pages
@param NumberOfPages No of pages to allocate
@param Alignment Bits to align.
@return The allocated memory, or NULL
**/
VOID *
CoreAllocatePoolPages (
IN EFI_MEMORY_TYPE PoolType,
IN UINTN NumberOfPages,
IN UINTN Alignment
)
{
UINT64 Start;
//
// Find the pages to convert
//
Start = FindFreePages (MAX_ADDRESS, NumberOfPages, PoolType, Alignment);
//
// Convert it to boot services data
//
if (Start == 0) {
DEBUG ((DEBUG_ERROR | DEBUG_PAGE, "AllocatePoolPages: failed to allocate %d pages\n", (UINT32)NumberOfPages));
} else {
CoreConvertPages (Start, NumberOfPages, PoolType);
}
return (VOID *) (UINTN) Start;
}
/**
Internal function. Frees pool pages allocated via AllocatePoolPages ()
@param Memory The base address to free
@param NumberOfPages The number of pages to free
**/
VOID
CoreFreePoolPages (
IN EFI_PHYSICAL_ADDRESS Memory,
IN UINTN NumberOfPages
)
{
CoreConvertPages (Memory, NumberOfPages, EfiConventionalMemory);
}
/**
Finds first free range between specified min and max address.
@param[in] MinAddress The address that the range must be above
@param[in] MaxAddress The address that the range must be below
@retval The memory range entry pointer to MEMORY_MAP structure.
NULL if no free range is found.
**/
MEMORY_MAP *
CoreFindFirstFreeRange (
IN UINT64 MinAddress,
IN UINT64 MaxAddress
)
{
LIST_ENTRY *Link;
MEMORY_MAP *Entry;
Entry = NULL;
for (Link = gMemoryMap.ForwardLink; Link != &gMemoryMap; Link = Link->ForwardLink) {
Entry = CR (Link, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
//
// If it's not a free entry, don't bother with it
//
if (Entry->Type != EfiConventionalMemory) {
continue;
}
//
// If desc is past max allowed address or below min allowed address, skip it
//
if ((Entry->Start >= MaxAddress) || (Entry->End < MinAddress)) {
continue;
}
return Entry;
}
return NULL;
}
/**
Retrieve the memory resource inforamtion for the specified type.
@param[in] Type The type of memory.
@param[out] StartAddr The pointer to receive the start address of the memory type.
@param[out] FreeAddr The pointer to receive the last free address of the memory type.
@param[out] EndAddr The pointer to receive the end address of the memory type.
@retval EFI_INVALID_PARAMETER Invalid parameter for Type.
EFI_SUCCESS Memory resoruce information is returned successfully.
**/
EFI_STATUS
EFIAPI
GetMemoryResourceInfo (
IN EFI_MEMORY_TYPE Type,
OUT UINT64 *StartAddr OPTIONAL,
OUT UINT64 *FreeAddr OPTIONAL,
OUT UINT64 *EndAddr OPTIONAL
)
{
MEMORY_MAP *Entry;
UINT64 Start;
UINT64 End;
if (Type >= EfiMaxMemoryType) {
return EFI_INVALID_PARAMETER;
}
Start = mMemoryTypeStatistics[Type].BaseAddress;
End = Start + LShiftU64 (mMemoryTypeStatistics[Type].NumberOfPages, EFI_PAGE_SHIFT) - 1;
if (StartAddr != NULL) {
*StartAddr = Start;
}
if (EndAddr != NULL) {
*EndAddr = End;
}
if (FreeAddr != NULL) {
Entry = CoreFindFirstFreeRange (Start, End);
if (Entry != NULL) {
*FreeAddr = Entry->End;
} else {
*FreeAddr = End;
}
}
return EFI_SUCCESS;
}
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