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/*
* This file is part of the coreboot project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "agesawrapper.h"
#include <amdlib.h>
#include <arch/acpi.h>
#include <BiosCallOuts.h>
#include <cbmem.h>
#include <string.h>
static void *GetHeapBase(void)
{
return cbmem_add(CBMEM_ID_RESUME_SCRATCH, BIOS_HEAP_SIZE);
}
static void EmptyHeap(int unused)
{
void *BiosManagerPtr = GetHeapBase();
memset(BiosManagerPtr, 0, BIOS_HEAP_SIZE);
}
#if IS_ENABLED(CONFIG_LATE_CBMEM_INIT)
#error "Only EARLY_CBMEM_INIT is supported."
#endif
ROMSTAGE_CBMEM_INIT_HOOK(EmptyHeap)
AGESA_STATUS agesa_AllocateBuffer (UINT32 Func, UINTN Data, VOID *ConfigPtr)
{
UINT32 AvailableHeapSize;
UINT8 *BiosHeapBaseAddr;
UINT32 CurrNodeOffset;
UINT32 PrevNodeOffset;
UINT32 FreedNodeOffset;
UINT32 BestFitNodeOffset;
UINT32 BestFitPrevNodeOffset;
UINT32 NextFreeOffset;
BIOS_BUFFER_NODE *CurrNodePtr;
BIOS_BUFFER_NODE *FreedNodePtr;
BIOS_BUFFER_NODE *BestFitNodePtr;
BIOS_BUFFER_NODE *BestFitPrevNodePtr;
BIOS_BUFFER_NODE *NextFreePtr;
BIOS_HEAP_MANAGER *BiosHeapBasePtr;
AGESA_BUFFER_PARAMS *AllocParams;
AllocParams = ((AGESA_BUFFER_PARAMS *)ConfigPtr);
AllocParams->BufferPointer = NULL;
AvailableHeapSize = BIOS_HEAP_SIZE - sizeof(BIOS_HEAP_MANAGER);
BiosHeapBaseAddr = GetHeapBase();
BiosHeapBasePtr = (BIOS_HEAP_MANAGER *)BiosHeapBaseAddr;
if (BiosHeapBasePtr->StartOfAllocatedNodes == 0) {
/* First allocation */
CurrNodeOffset = sizeof(BIOS_HEAP_MANAGER);
CurrNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ CurrNodeOffset);
CurrNodePtr->BufferHandle = AllocParams->BufferHandle;
CurrNodePtr->BufferSize = AllocParams->BufferLength;
CurrNodePtr->NextNodeOffset = 0;
AllocParams->BufferPointer = (UINT8 *)CurrNodePtr
+ sizeof(BIOS_BUFFER_NODE);
/* Update the remaining free space */
FreedNodeOffset = CurrNodeOffset + CurrNodePtr->BufferSize
+ sizeof(BIOS_BUFFER_NODE);
FreedNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ FreedNodeOffset);
FreedNodePtr->BufferSize = AvailableHeapSize
- sizeof(BIOS_BUFFER_NODE)
- CurrNodePtr->BufferSize;
FreedNodePtr->NextNodeOffset = 0;
/* Update the offsets for Allocated and Freed nodes */
BiosHeapBasePtr->StartOfAllocatedNodes = CurrNodeOffset;
BiosHeapBasePtr->StartOfFreedNodes = FreedNodeOffset;
} else {
/* Find out whether BufferHandle has been allocated on the heap.
* If it has, return AGESA_BOUNDS_CHK.
*/
CurrNodeOffset = BiosHeapBasePtr->StartOfAllocatedNodes;
CurrNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ CurrNodeOffset);
while (CurrNodeOffset != 0) {
CurrNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ CurrNodeOffset);
if (CurrNodePtr->BufferHandle ==
AllocParams->BufferHandle) {
return AGESA_BOUNDS_CHK;
}
CurrNodeOffset = CurrNodePtr->NextNodeOffset;
/* If BufferHandle has not been allocated on the heap,
* CurrNodePtr here points to the end of the allocated
* nodes list.
*/
}
/* Find the node that best fits the requested buffer size */
FreedNodeOffset = BiosHeapBasePtr->StartOfFreedNodes;
PrevNodeOffset = FreedNodeOffset;
BestFitNodeOffset = 0;
BestFitPrevNodeOffset = 0;
while (FreedNodeOffset != 0) { /* todo: simplify this */
FreedNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ FreedNodeOffset);
if (FreedNodePtr->BufferSize >= (AllocParams->BufferLength + sizeof(BIOS_BUFFER_NODE))) {
if (BestFitNodeOffset == 0) {
/* First node that fits the requested buffer size */
BestFitNodeOffset = FreedNodeOffset;
BestFitPrevNodeOffset = PrevNodeOffset;
} else {
/* Find out whether current node is a better fit than the previous nodes */
BestFitNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr + BestFitNodeOffset);
if (BestFitNodePtr->BufferSize > FreedNodePtr->BufferSize) {
BestFitNodeOffset = FreedNodeOffset;
BestFitPrevNodeOffset = PrevNodeOffset;
}
}
}
PrevNodeOffset = FreedNodeOffset;
FreedNodeOffset = FreedNodePtr->NextNodeOffset;
} /* end of while loop */
if (BestFitNodeOffset == 0) {
/* If we could not find a node that fits the requested
* buffer size, return AGESA_BOUNDS_CHK.
*/
return AGESA_BOUNDS_CHK;
} else {
BestFitNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ BestFitNodeOffset);
BestFitPrevNodePtr = (BIOS_BUFFER_NODE *)
(BiosHeapBaseAddr
+ BestFitPrevNodeOffset);
/* If BestFitNode is larger than the requested buffer,
* fragment the node further
*/
if (BestFitNodePtr->BufferSize >
(AllocParams->BufferLength
+ sizeof(BIOS_BUFFER_NODE))) {
NextFreeOffset = BestFitNodeOffset
+ AllocParams->BufferLength
+ sizeof(BIOS_BUFFER_NODE);
NextFreePtr = (BIOS_BUFFER_NODE *)
(BiosHeapBaseAddr
+ NextFreeOffset);
NextFreePtr->BufferSize =
BestFitNodePtr->BufferSize
- (AllocParams->BufferLength
+ sizeof(BIOS_BUFFER_NODE));
NextFreePtr->NextNodeOffset =
BestFitNodePtr->NextNodeOffset;
} else {
/* Otherwise, next free node is
* NextNodeOffset of BestFitNode
*/
NextFreeOffset = BestFitNodePtr->NextNodeOffset;
}
/* If BestFitNode is the first buffer in the list, then
* update StartOfFreedNodes to reflect new free node.
*/
if (BestFitNodeOffset ==
BiosHeapBasePtr->StartOfFreedNodes)
BiosHeapBasePtr->StartOfFreedNodes =
NextFreeOffset;
else
BestFitPrevNodePtr->NextNodeOffset =
NextFreeOffset;
/* Add BestFitNode to the list of Allocated nodes */
CurrNodePtr->NextNodeOffset = BestFitNodeOffset;
BestFitNodePtr->BufferSize = AllocParams->BufferLength;
BestFitNodePtr->BufferHandle =
AllocParams->BufferHandle;
BestFitNodePtr->NextNodeOffset = 0;
/* Remove BestFitNode from list of Freed nodes */
AllocParams->BufferPointer = (UINT8 *)BestFitNodePtr
+ sizeof(BIOS_BUFFER_NODE);
}
}
return AGESA_SUCCESS;
}
AGESA_STATUS agesa_DeallocateBuffer (UINT32 Func, UINTN Data, VOID *ConfigPtr)
{
UINT8 *BiosHeapBaseAddr;
UINT32 AllocNodeOffset;
UINT32 PrevNodeOffset;
UINT32 NextNodeOffset;
UINT32 FreedNodeOffset;
UINT32 EndNodeOffset;
BIOS_BUFFER_NODE *AllocNodePtr;
BIOS_BUFFER_NODE *PrevNodePtr;
BIOS_BUFFER_NODE *FreedNodePtr;
BIOS_BUFFER_NODE *NextNodePtr;
BIOS_HEAP_MANAGER *BiosHeapBasePtr;
AGESA_BUFFER_PARAMS *AllocParams;
AllocParams = (AGESA_BUFFER_PARAMS *)ConfigPtr;
BiosHeapBaseAddr = GetHeapBase();
BiosHeapBasePtr = (BIOS_HEAP_MANAGER *)BiosHeapBaseAddr;
/* Find target node to deallocate in list of allocated nodes.
* Return AGESA_BOUNDS_CHK if the BufferHandle is not found.
*/
AllocNodeOffset = BiosHeapBasePtr->StartOfAllocatedNodes;
AllocNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr + AllocNodeOffset);
PrevNodeOffset = AllocNodeOffset;
while (AllocNodePtr->BufferHandle != AllocParams->BufferHandle) {
if (AllocNodePtr->NextNodeOffset == 0)
return AGESA_BOUNDS_CHK;
PrevNodeOffset = AllocNodeOffset;
AllocNodeOffset = AllocNodePtr->NextNodeOffset;
AllocNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ AllocNodeOffset);
}
/* Remove target node from list of allocated nodes */
PrevNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr + PrevNodeOffset);
PrevNodePtr->NextNodeOffset = AllocNodePtr->NextNodeOffset;
/* Zero out the buffer, and clear the BufferHandle */
memset((UINT8 *)AllocNodePtr + sizeof(BIOS_BUFFER_NODE), 0,
AllocNodePtr->BufferSize);
AllocNodePtr->BufferHandle = 0;
AllocNodePtr->BufferSize += sizeof(BIOS_BUFFER_NODE);
/* Add deallocated node in order to the list of freed nodes */
FreedNodeOffset = BiosHeapBasePtr->StartOfFreedNodes;
FreedNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr + FreedNodeOffset);
EndNodeOffset = AllocNodeOffset + AllocNodePtr->BufferSize;
if (AllocNodeOffset < FreedNodeOffset) {
/* Add to the start of the freed list */
if (EndNodeOffset == FreedNodeOffset) {
/* If the freed node is adjacent to the first node in
* the list, concatenate both nodes
*/
AllocNodePtr->BufferSize += FreedNodePtr->BufferSize;
AllocNodePtr->NextNodeOffset =
FreedNodePtr->NextNodeOffset;
/* Clear the BufferSize and NextNodeOffset of the
* previous first node
*/
FreedNodePtr->BufferSize = 0;
FreedNodePtr->NextNodeOffset = 0;
} else {
/* Otherwise, add freed node to the start of the list
* Update NextNodeOffset and BufferSize to include the
* size of BIOS_BUFFER_NODE.
*/
AllocNodePtr->NextNodeOffset = FreedNodeOffset;
}
/* Update StartOfFreedNodes to the new first node */
BiosHeapBasePtr->StartOfFreedNodes = AllocNodeOffset;
} else {
/* Traverse list of freed nodes to find where the deallocated
* node should be placed.
*/
NextNodeOffset = FreedNodeOffset;
NextNodePtr = FreedNodePtr;
while (AllocNodeOffset > NextNodeOffset) {
PrevNodeOffset = NextNodeOffset;
if (NextNodePtr->NextNodeOffset == 0)
break;
NextNodeOffset = NextNodePtr->NextNodeOffset;
NextNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ NextNodeOffset);
}
/* If deallocated node is adjacent to the next node,
* concatenate both nodes.
*/
if (NextNodeOffset == EndNodeOffset) {
NextNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ NextNodeOffset);
AllocNodePtr->BufferSize += NextNodePtr->BufferSize;
AllocNodePtr->NextNodeOffset =
NextNodePtr->NextNodeOffset;
NextNodePtr->BufferSize = 0;
NextNodePtr->NextNodeOffset = 0;
} else {
/*AllocNodePtr->NextNodeOffset =
* FreedNodePtr->NextNodeOffset; */
AllocNodePtr->NextNodeOffset = NextNodeOffset;
}
/* If deallocated node is adjacent to the previous node,
* concatenate both nodes.
*/
PrevNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ PrevNodeOffset);
EndNodeOffset = PrevNodeOffset + PrevNodePtr->BufferSize;
if (AllocNodeOffset == EndNodeOffset) {
PrevNodePtr->NextNodeOffset =
AllocNodePtr->NextNodeOffset;
PrevNodePtr->BufferSize += AllocNodePtr->BufferSize;
AllocNodePtr->BufferSize = 0;
AllocNodePtr->NextNodeOffset = 0;
} else {
PrevNodePtr->NextNodeOffset = AllocNodeOffset;
}
}
return AGESA_SUCCESS;
}
AGESA_STATUS agesa_LocateBuffer (UINT32 Func, UINTN Data, VOID *ConfigPtr)
{
UINT32 AllocNodeOffset;
UINT8 *BiosHeapBaseAddr;
BIOS_BUFFER_NODE *AllocNodePtr;
BIOS_HEAP_MANAGER *BiosHeapBasePtr;
AGESA_BUFFER_PARAMS *AllocParams;
AllocParams = (AGESA_BUFFER_PARAMS *)ConfigPtr;
BiosHeapBaseAddr = GetHeapBase();
BiosHeapBasePtr = (BIOS_HEAP_MANAGER *)BiosHeapBaseAddr;
AllocNodeOffset = BiosHeapBasePtr->StartOfAllocatedNodes;
AllocNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr + AllocNodeOffset);
while (AllocParams->BufferHandle != AllocNodePtr->BufferHandle) {
if (AllocNodePtr->NextNodeOffset == 0) {
AllocParams->BufferPointer = NULL;
AllocParams->BufferLength = 0;
return AGESA_BOUNDS_CHK;
} else {
AllocNodeOffset = AllocNodePtr->NextNodeOffset;
AllocNodePtr = (BIOS_BUFFER_NODE *)(BiosHeapBaseAddr
+ AllocNodeOffset);
}
}
AllocParams->BufferPointer = (UINT8 *)((UINT8 *)AllocNodePtr
+ sizeof(BIOS_BUFFER_NODE));
AllocParams->BufferLength = AllocNodePtr->BufferSize;
return AGESA_SUCCESS;
}
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