2 SMM Memory pool management functions.
4 Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials are licensed and made available
6 under the terms and conditions of the BSD License which accompanies this
7 distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
15 #include "PiSmmCore.h"
18 // MIN_POOL_SHIFT must not be less than 5
20 #define MIN_POOL_SHIFT 6
21 #define MIN_POOL_SIZE (1 << MIN_POOL_SHIFT)
24 // MAX_POOL_SHIFT must not be less than EFI_PAGE_SHIFT - 1
26 #define MAX_POOL_SHIFT (EFI_PAGE_SHIFT - 1)
27 #define MAX_POOL_SIZE (1 << MAX_POOL_SHIFT)
30 // MAX_POOL_INDEX are calculated by maximum and minimum pool sizes
32 #define MAX_POOL_INDEX (MAX_POOL_SHIFT - MIN_POOL_SHIFT + 1)
44 LIST_ENTRY mSmmPoolLists
[MAX_POOL_INDEX
];
47 Called to initialize the memory service.
49 @param SmramRangeCount Number of SMRAM Regions
50 @param SmramRanges Pointer to SMRAM Descriptors
54 SmmInitializeMemoryServices (
55 IN UINTN SmramRangeCount
,
56 IN EFI_SMRAM_DESCRIPTOR
*SmramRanges
62 // Initialize Pool list
64 for (Index
= sizeof (mSmmPoolLists
) / sizeof (*mSmmPoolLists
); Index
> 0;) {
65 InitializeListHead (&mSmmPoolLists
[--Index
]);
69 // Initialize free SMRAM regions
71 for (Index
= 0; Index
< SmramRangeCount
; Index
++) {
73 SmramRanges
[Index
].CpuStart
,
74 SmramRanges
[Index
].PhysicalSize
,
75 EfiConventionalMemory
,
76 SmramRanges
[Index
].RegionState
82 Internal Function. Allocate a pool by specified PoolIndex.
84 @param PoolIndex Index which indicate the Pool size.
85 @param FreePoolHdr The returned Free pool.
87 @retval EFI_OUT_OF_RESOURCES Allocation failed.
88 @retval EFI_SUCCESS Pool successfully allocated.
92 InternalAllocPoolByIndex (
94 OUT FREE_POOL_HEADER
**FreePoolHdr
98 FREE_POOL_HEADER
*Hdr
;
100 Status
= EFI_SUCCESS
;
101 if (PoolIndex
== MAX_POOL_INDEX
) {
102 Hdr
= (FREE_POOL_HEADER
*)AllocatePages (EFI_SIZE_TO_PAGES (MAX_POOL_SIZE
<< 1));
104 Status
= EFI_OUT_OF_RESOURCES
;
106 } else if (!IsListEmpty (&mSmmPoolLists
[PoolIndex
])) {
107 Hdr
= BASE_CR (GetFirstNode (&mSmmPoolLists
[PoolIndex
]), FREE_POOL_HEADER
, Link
);
108 RemoveEntryList (&Hdr
->Link
);
110 Status
= InternalAllocPoolByIndex (PoolIndex
+ 1, &Hdr
);
111 if (!EFI_ERROR (Status
)) {
112 Hdr
->Header
.Size
>>= 1;
113 Hdr
->Header
.Available
= TRUE
;
114 InsertHeadList (&mSmmPoolLists
[PoolIndex
], &Hdr
->Link
);
115 Hdr
= (FREE_POOL_HEADER
*)((UINT8
*)Hdr
+ Hdr
->Header
.Size
);
119 if (!EFI_ERROR (Status
)) {
120 Hdr
->Header
.Size
= MIN_POOL_SIZE
<< PoolIndex
;
121 Hdr
->Header
.Available
= FALSE
;
129 Internal Function. Free a pool by specified PoolIndex.
131 @param FreePoolHdr The pool to free.
133 @retval EFI_SUCCESS Pool successfully freed.
137 InternalFreePoolByIndex (
138 IN FREE_POOL_HEADER
*FreePoolHdr
143 ASSERT ((FreePoolHdr
->Header
.Size
& (FreePoolHdr
->Header
.Size
- 1)) == 0);
144 ASSERT (((UINTN
)FreePoolHdr
& (FreePoolHdr
->Header
.Size
- 1)) == 0);
145 ASSERT (FreePoolHdr
->Header
.Size
>= MIN_POOL_SIZE
);
147 PoolIndex
= HighBitSet32 ((UINT32
)FreePoolHdr
->Header
.Size
) - MIN_POOL_SHIFT
;
148 FreePoolHdr
->Header
.Available
= TRUE
;
149 InsertHeadList (&mSmmPoolLists
[PoolIndex
], &FreePoolHdr
->Link
);
154 Allocate pool of a particular type.
156 @param PoolType Type of pool to allocate.
157 @param Size The amount of pool to allocate.
158 @param Buffer The address to return a pointer to the allocated
161 @retval EFI_INVALID_PARAMETER PoolType not valid.
162 @retval EFI_OUT_OF_RESOURCES Size exceeds max pool size or allocation failed.
163 @retval EFI_SUCCESS Pool successfully allocated.
169 IN EFI_MEMORY_TYPE PoolType
,
174 POOL_HEADER
*PoolHdr
;
175 FREE_POOL_HEADER
*FreePoolHdr
;
177 EFI_PHYSICAL_ADDRESS Address
;
180 if (PoolType
!= EfiRuntimeServicesCode
&&
181 PoolType
!= EfiRuntimeServicesData
) {
182 return EFI_INVALID_PARAMETER
;
190 Size
+= sizeof (*PoolHdr
);
191 if (Size
> MAX_POOL_SIZE
) {
192 Size
= EFI_SIZE_TO_PAGES (Size
);
193 Status
= SmmAllocatePages (AllocateAnyPages
, PoolType
, Size
, &Address
);
194 if (EFI_ERROR (Status
)) {
198 PoolHdr
= (POOL_HEADER
*)(UINTN
)Address
;
199 PoolHdr
->Size
= EFI_PAGES_TO_SIZE (Size
);
200 PoolHdr
->Available
= FALSE
;
201 *Buffer
= PoolHdr
+ 1;
205 Size
= (Size
+ MIN_POOL_SIZE
- 1) >> MIN_POOL_SHIFT
;
206 PoolIndex
= HighBitSet32 ((UINT32
)Size
);
207 if ((Size
& (Size
- 1)) != 0) {
211 Status
= InternalAllocPoolByIndex (PoolIndex
, &FreePoolHdr
);
212 *Buffer
= &FreePoolHdr
->Header
+ 1;
219 @param Buffer The allocated pool entry to free.
221 @retval EFI_INVALID_PARAMETER Buffer is not a valid value.
222 @retval EFI_SUCCESS Pool successfully freed.
231 FREE_POOL_HEADER
*FreePoolHdr
;
233 if (Buffer
== NULL
) {
234 return EFI_INVALID_PARAMETER
;
237 FreePoolHdr
= (FREE_POOL_HEADER
*)((POOL_HEADER
*)Buffer
- 1);
238 ASSERT (!FreePoolHdr
->Header
.Available
);
240 if (FreePoolHdr
->Header
.Size
> MAX_POOL_SIZE
) {
241 ASSERT (((UINTN
)FreePoolHdr
& EFI_PAGE_MASK
) == 0);
242 ASSERT ((FreePoolHdr
->Header
.Size
& EFI_PAGE_MASK
) == 0);
243 return SmmFreePages (
244 (EFI_PHYSICAL_ADDRESS
)(UINTN
)FreePoolHdr
,
245 EFI_SIZE_TO_PAGES (FreePoolHdr
->Header
.Size
)
248 return InternalFreePoolByIndex (FreePoolHdr
);