ArmPlatformPkg: Introduce ArmPlatformGlobalVariableLib
[mirror_edk2.git] / ArmPlatformPkg / Library / ArmPlatformGlobalVariableLib / Pei / PeiArmPlatformGlobalVariableLib.c
1 /** @file
2 *
3 * Copyright (c) 2011, ARM Limited. All rights reserved.
4 *
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
9 *
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.
12 *
13 **/
14
15 #include <Uefi.h>
16 #include <Library/ArmPlatformGlobalVariableLib.h>
17 #include <Library/BaseLib.h>
18 #include <Library/BaseMemoryLib.h>
19 #include <Library/PcdLib.h>
20
21 //TODO: RemoveMe
22 //#include <Library/DebugLib.h>
23
24 // Declared by ArmPlatformPkg/PrePi Module
25 extern UINTN mGlobalVariableBase;
26
27 VOID
28 ArmPlatformGetGlobalVariable (
29 IN UINTN VariableOffset,
30 IN UINTN VariableSize,
31 OUT VOID* Variable
32 )
33 {
34 UINTN GlobalVariableBase;
35
36 GlobalVariableBase = PcdGet32 (PcdCPUCoresStackBase) + PcdGet32 (PcdCPUCorePrimaryStackSize) - PcdGet32 (PcdPeiGlobalVariableSize) + VariableOffset;
37
38 if (VariableSize == 4) {
39 *(UINT32*)Variable = ReadUnaligned32 ((CONST UINT32*)(GlobalVariableBase + VariableOffset));
40 } else if (VariableSize == 8) {
41 *(UINT32*)Variable = ReadUnaligned64 ((CONST UINT64*)(GlobalVariableBase + VariableOffset));
42 } else {
43 CopyMem (Variable, (VOID*)(GlobalVariableBase + VariableOffset), VariableSize);
44 }
45
46 //DEBUG((EFI_D_ERROR,"++ GET Offset[%d] = 0x%x\n",VariableOffset,*(UINTN*)Variable));
47 }
48
49 VOID
50 ArmPlatformSetGlobalVariable (
51 IN UINTN VariableOffset,
52 IN UINTN VariableSize,
53 OUT VOID* Variable
54 )
55 {
56 UINTN GlobalVariableBase;
57
58 GlobalVariableBase = PcdGet32 (PcdCPUCoresStackBase) + PcdGet32 (PcdCPUCorePrimaryStackSize) - PcdGet32 (PcdPeiGlobalVariableSize) + VariableOffset;
59
60 if (VariableSize == 4) {
61 WriteUnaligned32 ((UINT32*)(GlobalVariableBase + VariableOffset), *(UINT32*)Variable);
62 } else if (VariableSize == 8) {
63 WriteUnaligned64 ((UINT64*)(GlobalVariableBase + VariableOffset), *(UINT64*)Variable);
64 } else {
65 CopyMem ((VOID*)(GlobalVariableBase + VariableOffset), Variable, VariableSize);
66 }
67
68 //DEBUG((EFI_D_ERROR,"++ SET Offset[%d] = 0x%x\n",VariableOffset,*(UINTN*)Variable));
69 }
70