3 * Copyright (c) 2011, ARM Limited. All rights reserved.
5 * This program and the accompanying materials
6 * are licensed and made available under the terms and conditions of the BSD License
7 * which accompanies this 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.
16 #include <Library/ArmPlatformGlobalVariableLib.h>
17 #include <Library/BaseLib.h>
18 #include <Library/BaseMemoryLib.h>
19 #include <Library/PcdLib.h>
21 #define IS_XIP() (((UINT32)PcdGet32 (PcdFdBaseAddress) > (UINT32)(PcdGet32 (PcdSystemMemoryBase) + PcdGet32 (PcdSystemMemorySize))) || \
22 ((PcdGet32 (PcdFdBaseAddress) + PcdGet32 (PcdFdSize)) < PcdGet32 (PcdSystemMemoryBase)))
24 // Declared by ArmPlatformPkg/PrePi Module
25 extern UINTN mGlobalVariableBase
;
28 ArmPlatformGetGlobalVariable (
29 IN UINTN VariableOffset
,
30 IN UINTN VariableSize
,
34 UINTN GlobalVariableBase
;
37 // In Case of XIP, we expect the Primary Stack at the top of the System Memory
38 // The size must be 64bit aligned to allow 64bit variable to be aligned
39 GlobalVariableBase
= PcdGet32 (PcdSystemMemoryBase
) + PcdGet32 (PcdSystemMemorySize
) - ALIGN_VALUE(PcdGet32 (PcdPeiGlobalVariableSize
),0x8);
41 GlobalVariableBase
= mGlobalVariableBase
;
44 if (VariableSize
== 4) {
45 *(UINT32
*)Variable
= ReadUnaligned32 ((CONST UINT32
*)(GlobalVariableBase
+ VariableOffset
));
46 } else if (VariableSize
== 8) {
47 *(UINT32
*)Variable
= ReadUnaligned64 ((CONST UINT64
*)(GlobalVariableBase
+ VariableOffset
));
49 CopyMem (Variable
, (VOID
*)(GlobalVariableBase
+ VariableOffset
), VariableSize
);
54 ArmPlatformSetGlobalVariable (
55 IN UINTN VariableOffset
,
56 IN UINTN VariableSize
,
60 UINTN GlobalVariableBase
;
63 // In Case of XIP, we expect the Primary Stack at the top of the System Memory
64 // The size must be 64bit aligned to allow 64bit variable to be aligned
65 GlobalVariableBase
= PcdGet32 (PcdSystemMemoryBase
) + PcdGet32 (PcdSystemMemorySize
) - ALIGN_VALUE(PcdGet32 (PcdPeiGlobalVariableSize
),0x8);
67 GlobalVariableBase
= mGlobalVariableBase
;
70 if (VariableSize
== 4) {
71 WriteUnaligned32 ((UINT32
*)(GlobalVariableBase
+ VariableOffset
), *(UINT32
*)Variable
);
72 } else if (VariableSize
== 8) {
73 WriteUnaligned64 ((UINT64
*)(GlobalVariableBase
+ VariableOffset
), *(UINT64
*)Variable
);
75 CopyMem ((VOID
*)(GlobalVariableBase
+ VariableOffset
), Variable
, VariableSize
);