1 /*++ @file
2 Stub SEC that is called from the OS application that is the root of the emulator.
3
4 The OS application will call the SEC with the PEI Entry Point API.
5
6 Copyright (c) 2011, Apple Inc. All rights reserved.<BR>
7 SPDX-License-Identifier: BSD-2-Clause-Patent
8
9 **/
10
11 #include "Sec.h"
12
13
14
15 EFI_PEI_TEMPORARY_RAM_SUPPORT_PPI mSecTemporaryRamSupportPpi = {
16 SecTemporaryRamSupport
17 };
18
19
20 EFI_PEI_PPI_DESCRIPTOR gPrivateDispatchTable[] = {
21 {
22 EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
23 &gEfiTemporaryRamSupportPpiGuid,
24 &mSecTemporaryRamSupportPpi
25 }
26 };
27
28
29
30 /**
31 The entry point of PE/COFF Image for the PEI Core, that has been hijacked by this
32 SEC that sits on top of an OS application. So the entry and exit of this module
33 has the same API.
34
35 This function is the entry point for the PEI Foundation, which allows the SEC phase
36 to pass information about the stack, temporary RAM and the Boot Firmware Volume.
37 In addition, it also allows the SEC phase to pass services and data forward for use
38 during the PEI phase in the form of one or more PPIs.
39 There is no limit to the number of additional PPIs that can be passed from SEC into
40 the PEI Foundation. As part of its initialization phase, the PEI Foundation will add
41 these SEC-hosted PPIs to its PPI database such that both the PEI Foundation and any
42 modules can leverage the associated service calls and/or code in these early PPIs.
43 This function is required to call ProcessModuleEntryPointList() with the Context
44 parameter set to NULL. ProcessModuleEntryPoint() is never expected to return.
45 The PEI Core is responsible for calling ProcessLibraryConstructorList() as soon as
46 the PEI Services Table and the file handle for the PEI Core itself have been established.
47 If ProcessModuleEntryPointList() returns, then ASSERT() and halt the system.
48
49 @param SecCoreData Points to a data structure containing information about the PEI
50 core's operating environment, such as the size and location of
51 temporary RAM, the stack location and the BFV location.
52
53 @param PpiList Points to a list of one or more PPI descriptors to be installed
54 initially by the PEI core. An empty PPI list consists of a single
55 descriptor with the end-tag EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST.
56 As part of its initialization phase, the PEI Foundation will add
57 these SEC-hosted PPIs to its PPI database such that both the PEI
58 Foundation and any modules can leverage the associated service calls
59 and/or code in these early PPIs.
60
61 **/
62 VOID
63 EFIAPI
_ModuleEntryPoint(IN EFI_SEC_PEI_HAND_OFF * SecCoreData,IN EFI_PEI_PPI_DESCRIPTOR * PpiList)64 _ModuleEntryPoint (
65 IN EFI_SEC_PEI_HAND_OFF *SecCoreData,
66 IN EFI_PEI_PPI_DESCRIPTOR *PpiList
67 )
68 {
69 EFI_STATUS Status;
70 EFI_PEI_FV_HANDLE VolumeHandle;
71 EFI_PEI_FILE_HANDLE FileHandle;
72 VOID *PeCoffImage;
73 EFI_PEI_CORE_ENTRY_POINT EntryPoint;
74 EFI_PEI_PPI_DESCRIPTOR *Ppi;
75 EFI_PEI_PPI_DESCRIPTOR *SecPpiList;
76 UINTN SecReseveredMemorySize;
77 UINTN Index;
78 EFI_PEI_PPI_DESCRIPTOR PpiArray[10];
79
80 EMU_MAGIC_PAGE()->PpiList = PpiList;
81 ProcessLibraryConstructorList ();
82
83 DEBUG ((EFI_D_ERROR, "SEC Has Started\n"));
84
85 //
86 // Add Our PPIs to the list
87 //
88 SecReseveredMemorySize = sizeof (gPrivateDispatchTable);
89 for (Ppi = PpiList, Index = 1; ; Ppi++, Index++) {
90 SecReseveredMemorySize += sizeof (EFI_PEI_PPI_DESCRIPTOR);
91
92 if ((Ppi->Flags & EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) == EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) {
93 // Since we are appending, need to clear out previous list terminator.
94 Ppi->Flags &= ~EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST;
95 break;
96 }
97 }
98
99 // Keep everything on a good alignment
100 SecReseveredMemorySize = ALIGN_VALUE (SecReseveredMemorySize, CPU_STACK_ALIGNMENT);
101
102 #if 0
103 // Tell the PEI Core to not use our buffer in temp RAM
104 SecPpiList = (EFI_PEI_PPI_DESCRIPTOR *)SecCoreData->PeiTemporaryRamBase;
105 SecCoreData->PeiTemporaryRamBase = (VOID *)((UINTN)SecCoreData->PeiTemporaryRamBase + SecReseveredMemorySize);
106 SecCoreData->PeiTemporaryRamSize -= SecReseveredMemorySize;
107 #else
108 //
109 // When I subtrack from SecCoreData->PeiTemporaryRamBase PEI Core crashes? Either there is a bug
110 // or I don't understand temp RAM correctly?
111 //
112
113 SecPpiList = &PpiArray[0];
114 ASSERT (sizeof (PpiArray) >= SecReseveredMemorySize);
115 #endif
116 // Copy existing list, and append our entries.
117 CopyMem (SecPpiList, PpiList, sizeof (EFI_PEI_PPI_DESCRIPTOR) * Index);
118 CopyMem (&SecPpiList[Index], gPrivateDispatchTable, sizeof (gPrivateDispatchTable));
119
120 // Find PEI Core and transfer control
121 VolumeHandle = (EFI_PEI_FV_HANDLE)(UINTN)SecCoreData->BootFirmwareVolumeBase;
122 FileHandle = NULL;
123 Status = PeiServicesFfsFindNextFile (EFI_FV_FILETYPE_PEI_CORE, VolumeHandle, &FileHandle);
124 ASSERT_EFI_ERROR (Status);
125
126 Status = PeiServicesFfsFindSectionData (EFI_SECTION_PE32, FileHandle, &PeCoffImage);
127 ASSERT_EFI_ERROR (Status);
128
129 Status = PeCoffLoaderGetEntryPoint (PeCoffImage, (VOID **)&EntryPoint);
130 ASSERT_EFI_ERROR (Status);
131
132 // Transfer control to PEI Core
133 EntryPoint (SecCoreData, SecPpiList);
134
135 // PEI Core never returns
136 ASSERT (FALSE);
137 return;
138 }
139
140
141