blob: a0c9facdea64e265a6f9f7b89b077f8512536f73 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/** @file
Copyright (c) 2016, Linaro Limited. All rights reserved.
Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
*/
#include <Base.h>
#include <Library/ArmLib.h>
#include <Library/ArmMmuLib.h>
#include <Library/CacheMaintenanceLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include "ArmMmuLibInternal.h"
EFI_STATUS
EFIAPI
ArmMmuPeiLibConstructor (
IN EFI_PEI_FILE_HANDLE FileHandle,
IN CONST EFI_PEI_SERVICES **PeiServices
)
{
extern UINT32 ArmReplaceLiveTranslationEntrySize;
ARM_REPLACE_LIVE_TRANSLATION_ENTRY ArmReplaceLiveTranslationEntryFunc;
VOID *Hob;
EFI_FV_FILE_INFO FileInfo;
EFI_STATUS Status;
ASSERT (FileHandle != NULL);
Status = (*PeiServices)->FfsGetFileInfo (FileHandle, &FileInfo);
ASSERT_EFI_ERROR (Status);
//
// Some platforms do not cope very well with cache maintenance being
// performed on regions backed by NOR flash. Since the firmware image
// can be assumed to be clean to the PoC when running XIP, even when PEI
// is executing from DRAM, we only need to perform the cache maintenance
// when not executing in place.
//
if (((UINTN)FileInfo.Buffer <= (UINTN)ArmReplaceLiveTranslationEntry) &&
((UINTN)FileInfo.Buffer + FileInfo.BufferSize >=
(UINTN)ArmReplaceLiveTranslationEntry + ArmReplaceLiveTranslationEntrySize))
{
DEBUG ((DEBUG_INFO, "ArmMmuLib: skipping cache maintenance on XIP PEIM\n"));
//
// Expose the XIP version of the ArmReplaceLiveTranslationEntry() routine
// via a HOB so we can fall back to it later when we need to split block
// mappings in a way that adheres to break-before-make requirements.
//
ArmReplaceLiveTranslationEntryFunc = ArmReplaceLiveTranslationEntry;
Hob = BuildGuidDataHob (
&gArmMmuReplaceLiveTranslationEntryFuncGuid,
&ArmReplaceLiveTranslationEntryFunc,
sizeof ArmReplaceLiveTranslationEntryFunc
);
ASSERT (Hob != NULL);
} else {
DEBUG ((DEBUG_INFO, "ArmMmuLib: performing cache maintenance on shadowed PEIM\n"));
//
// The ArmReplaceLiveTranslationEntry () helper function may be invoked
// with the MMU off so we have to ensure that it gets cleaned to the PoC
//
WriteBackDataCacheRange (
(VOID *)(UINTN)ArmReplaceLiveTranslationEntry,
ArmReplaceLiveTranslationEntrySize
);
}
return RETURN_SUCCESS;
}
|
