mirror of https://github.com/acidanthera/audk.git
439 lines
12 KiB
C
439 lines
12 KiB
C
/** @file
|
|
Light-weight Memory Management Routines for OpenSSL-based Crypto
|
|
Library at Runtime Phase.
|
|
|
|
Copyright (c) 2009 - 2012, 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 <OpenSslSupport.h>
|
|
#include <Library/UefiBootServicesTableLib.h>
|
|
#include <Library/UefiRuntimeLib.h>
|
|
#include <Guid/EventGroup.h>
|
|
|
|
//----------------------------------------------------------------
|
|
// Initial version. Needs further optimizations.
|
|
//----------------------------------------------------------------
|
|
|
|
//
|
|
// Definitions for Runtime Memory Operations
|
|
//
|
|
#define RT_PAGE_SIZE 0x200
|
|
#define RT_PAGE_MASK 0x1FF
|
|
#define RT_PAGE_SHIFT 9
|
|
|
|
#define RT_SIZE_TO_PAGES(a) (((a) >> RT_PAGE_SHIFT) + (((a) & RT_PAGE_MASK) ? 1 : 0))
|
|
#define RT_PAGES_TO_SIZE(a) ((a) << RT_PAGE_SHIFT)
|
|
|
|
//
|
|
// Page Flag Definitions
|
|
//
|
|
#define RT_PAGE_FREE 0x00000000
|
|
#define RT_PAGE_USED 0x00000001
|
|
|
|
#define MIN_REQUIRED_BLOCKS 600
|
|
|
|
//
|
|
// Memory Page Table
|
|
//
|
|
typedef struct {
|
|
UINTN StartPageOffset; // Offset of the starting page allocated.
|
|
// Only available for USED pages.
|
|
UINT32 PageFlag; // Page Attributes.
|
|
} RT_MEMORY_PAGE_ENTRY;
|
|
|
|
typedef struct {
|
|
UINTN PageCount;
|
|
UINTN LastEmptyPageOffset;
|
|
UINT8 *DataAreaBase; // Pointer to data Area.
|
|
RT_MEMORY_PAGE_ENTRY Pages[1]; // Page Table Entries.
|
|
} RT_MEMORY_PAGE_TABLE;
|
|
|
|
//
|
|
// Global Page Table for Runtime Cryptographic Provider.
|
|
//
|
|
RT_MEMORY_PAGE_TABLE *mRTPageTable = NULL;
|
|
|
|
//
|
|
// Event for Runtime Address Conversion.
|
|
//
|
|
STATIC EFI_EVENT mVirtualAddressChangeEvent;
|
|
|
|
|
|
/**
|
|
Initializes pre-allocated memory pointed by ScratchBuffer for subsequent
|
|
runtime use.
|
|
|
|
@param[in, out] ScratchBuffer Pointer to user-supplied memory buffer.
|
|
@param[in] ScratchBufferSize Size of supplied buffer in bytes.
|
|
|
|
@retval EFI_SUCCESS Successful initialization.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
InitializeScratchMemory (
|
|
IN OUT UINT8 *ScratchBuffer,
|
|
IN UINTN ScratchBufferSize
|
|
)
|
|
{
|
|
UINTN Index;
|
|
UINTN MemorySize;
|
|
|
|
//
|
|
// Parameters Checking
|
|
//
|
|
if (ScratchBuffer == NULL) {
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
if (ScratchBufferSize < MIN_REQUIRED_BLOCKS * 1024) {
|
|
return EFI_BUFFER_TOO_SMALL;
|
|
}
|
|
|
|
mRTPageTable = (RT_MEMORY_PAGE_TABLE *)ScratchBuffer;
|
|
|
|
//
|
|
// Initialize Internal Page Table for Memory Management
|
|
//
|
|
SetMem (mRTPageTable, ScratchBufferSize, 0xFF);
|
|
MemorySize = ScratchBufferSize - sizeof (RT_MEMORY_PAGE_TABLE) + sizeof (RT_MEMORY_PAGE_ENTRY);
|
|
|
|
mRTPageTable->PageCount = MemorySize / (RT_PAGE_SIZE + sizeof (RT_MEMORY_PAGE_ENTRY));
|
|
mRTPageTable->LastEmptyPageOffset = 0x0;
|
|
|
|
for (Index = 0; Index < mRTPageTable->PageCount; Index++) {
|
|
mRTPageTable->Pages[Index].PageFlag = RT_PAGE_FREE;
|
|
mRTPageTable->Pages[Index].StartPageOffset = 0;
|
|
}
|
|
|
|
mRTPageTable->DataAreaBase = ScratchBuffer + sizeof (RT_MEMORY_PAGE_TABLE) +
|
|
(mRTPageTable->PageCount - 1) * sizeof (RT_MEMORY_PAGE_ENTRY);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
|
|
/**
|
|
Look-up Free memory Region for object allocation.
|
|
|
|
@param[in] AllocationSize Bytes to be allocated.
|
|
|
|
@return Return available page offset for object allocation.
|
|
|
|
**/
|
|
UINTN
|
|
LookupFreeMemRegion (
|
|
IN UINTN AllocationSize
|
|
)
|
|
{
|
|
UINTN StartPageIndex;
|
|
UINTN Index;
|
|
UINTN SubIndex;
|
|
UINTN ReqPages;
|
|
|
|
StartPageIndex = RT_SIZE_TO_PAGES (mRTPageTable->LastEmptyPageOffset);
|
|
ReqPages = RT_SIZE_TO_PAGES (AllocationSize);
|
|
|
|
//
|
|
// Look up the free memory region with in current memory map table.
|
|
//
|
|
for (Index = StartPageIndex; Index <= (mRTPageTable->PageCount - ReqPages); ) {
|
|
//
|
|
// Check consecutive ReqPages pages.
|
|
//
|
|
for (SubIndex = 0; SubIndex < ReqPages; SubIndex++) {
|
|
if ((mRTPageTable->Pages[SubIndex + Index].PageFlag & RT_PAGE_USED) != 0) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (SubIndex == ReqPages) {
|
|
//
|
|
// Succeed! Return the Starting Offset.
|
|
//
|
|
return RT_PAGES_TO_SIZE (Index);
|
|
}
|
|
|
|
//
|
|
// Failed! Skip current free memory pages and adjacent Used pages
|
|
//
|
|
while ((mRTPageTable->Pages[SubIndex + Index].PageFlag & RT_PAGE_USED) != 0) {
|
|
SubIndex++;
|
|
}
|
|
|
|
Index += SubIndex;
|
|
}
|
|
|
|
//
|
|
// Look up the free memory region from the beginning of the memory table
|
|
// until the StartCursorOffset
|
|
//
|
|
for (Index = 0; Index < (StartPageIndex - ReqPages); ) {
|
|
//
|
|
// Check Consecutive ReqPages Pages.
|
|
//
|
|
for (SubIndex = 0; SubIndex < ReqPages; SubIndex++) {
|
|
if ((mRTPageTable->Pages[SubIndex + Index].PageFlag & RT_PAGE_USED) != 0) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (SubIndex == ReqPages) {
|
|
//
|
|
// Succeed! Return the Starting Offset.
|
|
//
|
|
return RT_PAGES_TO_SIZE (Index);
|
|
}
|
|
|
|
//
|
|
// Failed! Skip current adjacent Used pages
|
|
//
|
|
while ((SubIndex < (StartPageIndex - ReqPages)) &&
|
|
((mRTPageTable->Pages[SubIndex + Index].PageFlag & RT_PAGE_USED) != 0)) {
|
|
SubIndex++;
|
|
}
|
|
|
|
Index += SubIndex;
|
|
}
|
|
|
|
//
|
|
// No availabe region for object allocation!
|
|
//
|
|
return (UINTN)(-1);
|
|
}
|
|
|
|
|
|
/**
|
|
Allocates a buffer at runtime phase.
|
|
|
|
@param[in] AllocationSize Bytes to be allocated.
|
|
|
|
@return A pointer to the allocated buffer or NULL if allocation fails.
|
|
|
|
**/
|
|
VOID *
|
|
RuntimeAllocateMem (
|
|
IN UINTN AllocationSize
|
|
)
|
|
{
|
|
UINT8 *AllocPtr;
|
|
UINTN ReqPages;
|
|
UINTN Index;
|
|
UINTN StartPage;
|
|
UINTN AllocOffset;
|
|
|
|
AllocPtr = NULL;
|
|
ReqPages = 0;
|
|
|
|
//
|
|
// Look for available consecutive memory region starting from LastEmptyPageOffset.
|
|
// If no proper memory region found, look up from the beginning.
|
|
// If still not found, return NULL to indicate failed allocation.
|
|
//
|
|
AllocOffset = LookupFreeMemRegion (AllocationSize);
|
|
if (AllocOffset == (UINTN)(-1)) {
|
|
return NULL;
|
|
}
|
|
|
|
//
|
|
// Allocates consecutive memory pages with length of Size. Update the page
|
|
// table status. Returns the starting address.
|
|
//
|
|
ReqPages = RT_SIZE_TO_PAGES (AllocationSize);
|
|
AllocPtr = mRTPageTable->DataAreaBase + AllocOffset;
|
|
StartPage = RT_SIZE_TO_PAGES (AllocOffset);
|
|
Index = 0;
|
|
while (Index < ReqPages) {
|
|
mRTPageTable->Pages[StartPage + Index].PageFlag |= RT_PAGE_USED;
|
|
mRTPageTable->Pages[StartPage + Index].StartPageOffset = AllocOffset;
|
|
|
|
Index++;
|
|
}
|
|
|
|
mRTPageTable->LastEmptyPageOffset = AllocOffset + RT_PAGES_TO_SIZE (ReqPages);
|
|
|
|
ZeroMem (AllocPtr, AllocationSize);
|
|
|
|
//
|
|
// Returns a void pointer to the allocated space
|
|
//
|
|
return AllocPtr;
|
|
}
|
|
|
|
|
|
/**
|
|
Frees a buffer that was previously allocated at runtime phase.
|
|
|
|
@param[in] Buffer Pointer to the buffer to free.
|
|
|
|
**/
|
|
VOID
|
|
RuntimeFreeMem (
|
|
IN VOID *Buffer
|
|
)
|
|
{
|
|
UINTN StartOffset;
|
|
UINTN StartPageIndex;
|
|
|
|
StartOffset = (UINTN) ((UINT8 *)Buffer - mRTPageTable->DataAreaBase);
|
|
StartPageIndex = RT_SIZE_TO_PAGES (mRTPageTable->Pages[RT_SIZE_TO_PAGES(StartOffset)].StartPageOffset);
|
|
|
|
while (StartPageIndex < mRTPageTable->PageCount) {
|
|
if (((mRTPageTable->Pages[StartPageIndex].PageFlag & RT_PAGE_USED) != 0) &&
|
|
(mRTPageTable->Pages[StartPageIndex].StartPageOffset == StartOffset)) {
|
|
//
|
|
// Free this page
|
|
//
|
|
mRTPageTable->Pages[StartPageIndex].PageFlag &= ~RT_PAGE_USED;
|
|
mRTPageTable->Pages[StartPageIndex].PageFlag |= RT_PAGE_FREE;
|
|
mRTPageTable->Pages[StartPageIndex].StartPageOffset = 0;
|
|
|
|
StartPageIndex++;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/**
|
|
Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.
|
|
|
|
This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE
|
|
event. It converts a pointer to a new virtual address.
|
|
|
|
@param[in] Event The event whose notification function is being invoked.
|
|
@param[in] Context The pointer to the notification function's context.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
RuntimeCryptLibAddressChangeEvent (
|
|
IN EFI_EVENT Event,
|
|
IN VOID *Context
|
|
)
|
|
{
|
|
//
|
|
// Converts a pointer for runtime memory management to a new virtual address.
|
|
//
|
|
EfiConvertPointer (0x0, (VOID **) &mRTPageTable->DataAreaBase);
|
|
EfiConvertPointer (0x0, (VOID **) &mRTPageTable);
|
|
}
|
|
|
|
|
|
/**
|
|
Constructor routine for runtime crypt library instance.
|
|
|
|
The constructor function pre-allocates space for runtime cryptographic operation.
|
|
|
|
@param ImageHandle The firmware allocated handle for the EFI image.
|
|
@param SystemTable A pointer to the EFI System Table.
|
|
|
|
@retval EFI_SUCCESS The construction succeeded.
|
|
@retval EFI_OUT_OF_RESOURCE Failed to allocate memory.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
RuntimeCryptLibConstructor (
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
VOID *Buffer;
|
|
|
|
//
|
|
// Pre-allocates runtime space for possible cryptographic operations
|
|
//
|
|
Buffer = AllocateRuntimePool (MIN_REQUIRED_BLOCKS * 1024);
|
|
Status = InitializeScratchMemory (Buffer, MIN_REQUIRED_BLOCKS * 1024);
|
|
if (EFI_ERROR (Status)) {
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Create address change event
|
|
//
|
|
Status = gBS->CreateEventEx (
|
|
EVT_NOTIFY_SIGNAL,
|
|
TPL_NOTIFY,
|
|
RuntimeCryptLibAddressChangeEvent,
|
|
NULL,
|
|
&gEfiEventVirtualAddressChangeGuid,
|
|
&mVirtualAddressChangeEvent
|
|
);
|
|
ASSERT_EFI_ERROR (Status);
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
//
|
|
// -- Memory-Allocation Routines Wrapper for UEFI-OpenSSL Library --
|
|
//
|
|
|
|
/* Allocates memory blocks */
|
|
void *malloc (size_t size)
|
|
{
|
|
return RuntimeAllocateMem ((UINTN) size);
|
|
}
|
|
|
|
/* Reallocate memory blocks */
|
|
void *realloc (void *ptr, size_t size)
|
|
{
|
|
VOID *NewPtr;
|
|
UINTN StartOffset;
|
|
UINTN StartPageIndex;
|
|
UINTN PageCount;
|
|
|
|
//
|
|
// Get Original Size of ptr
|
|
//
|
|
StartOffset = (UINTN) ((UINT8 *)ptr - mRTPageTable->DataAreaBase);
|
|
StartPageIndex = RT_SIZE_TO_PAGES (mRTPageTable->Pages[RT_SIZE_TO_PAGES (StartOffset)].StartPageOffset);
|
|
PageCount = 0;
|
|
while (StartPageIndex < mRTPageTable->PageCount) {
|
|
if (((mRTPageTable->Pages[StartPageIndex].PageFlag & RT_PAGE_USED) != 0) &&
|
|
(mRTPageTable->Pages[StartPageIndex].StartPageOffset == StartOffset)) {
|
|
StartPageIndex++;
|
|
PageCount++;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (size <= RT_PAGES_TO_SIZE (PageCount)) {
|
|
//
|
|
// Return the original pointer, if Caller try to reduce region size;
|
|
//
|
|
return ptr;
|
|
}
|
|
|
|
NewPtr = RuntimeAllocateMem ((UINTN) size);
|
|
if (NewPtr == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
CopyMem (NewPtr, ptr, RT_PAGES_TO_SIZE (PageCount));
|
|
|
|
RuntimeFreeMem (ptr);
|
|
|
|
return NewPtr;
|
|
}
|
|
|
|
/* Deallocates or frees a memory block */
|
|
void free (void *ptr)
|
|
{
|
|
RuntimeFreeMem (ptr);
|
|
}
|