1 /*++ @file
2 Stub SEC that is called from the OS appliation 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 This program and the accompanying materials
8 are licensed and made available under the terms and conditions of the BSD License
9 which accompanies this distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php
11
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
14
15 **/
16
17 #include "Sec.h"
18
19
20
21 EFI_PEI_TEMPORARY_RAM_SUPPORT_PPI mSecTemporaryRamSupportPpi = {
22 SecTemporaryRamSupport
23 };
24
25
26 EFI_PEI_PPI_DESCRIPTOR gPrivateDispatchTable[] = {
27 {
28 EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
29 &gEfiTemporaryRamSupportPpiGuid,
30 &mSecTemporaryRamSupportPpi
31 }
32 };
33
34
35
36 /**
37 The entry point of PE/COFF Image for the PEI Core, that has been hijacked by this
38 SEC that sits on top of an OS application. So the entry and exit of this module
39 has the same API.
40
41 This function is the entry point for the PEI Foundation, which allows the SEC phase
42 to pass information about the stack, temporary RAM and the Boot Firmware Volume.
43 In addition, it also allows the SEC phase to pass services and data forward for use
44 during the PEI phase in the form of one or more PPIs.
45 There is no limit to the number of additional PPIs that can be passed from SEC into
46 the PEI Foundation. As part of its initialization phase, the PEI Foundation will add
47 these SEC-hosted PPIs to its PPI database such that both the PEI Foundation and any
48 modules can leverage the associated service calls and/or code in these early PPIs.
49 This function is required to call ProcessModuleEntryPointList() with the Context
50 parameter set to NULL. ProcessModuleEntryPoint() is never expected to return.
51 The PEI Core is responsible for calling ProcessLibraryConstructorList() as soon as
52 the PEI Services Table and the file handle for the PEI Core itself have been established.
53 If ProcessModuleEntryPointList() returns, then ASSERT() and halt the system.
54
55 @param SecCoreData Points to a data structure containing information about the PEI
56 core's operating environment, such as the size and location of
57 temporary RAM, the stack location and the BFV location.
58
59 @param PpiList Points to a list of one or more PPI descriptors to be installed
60 initially by the PEI core. An empty PPI list consists of a single
61 descriptor with the end-tag EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST.
62 As part of its initialization phase, the PEI Foundation will add
63 these SEC-hosted PPIs to its PPI database such that both the PEI
64 Foundation and any modules can leverage the associated service calls
65 and/or code in these early PPIs.
66
67 **/
68 VOID
69 EFIAPI
_ModuleEntryPoint(IN EFI_SEC_PEI_HAND_OFF * SecCoreData,IN EFI_PEI_PPI_DESCRIPTOR * PpiList)70 _ModuleEntryPoint (
71 IN EFI_SEC_PEI_HAND_OFF *SecCoreData,
72 IN EFI_PEI_PPI_DESCRIPTOR *PpiList
73 )
74 {
75 EFI_STATUS Status;
76 EFI_PEI_FV_HANDLE VolumeHandle;
77 EFI_PEI_FILE_HANDLE FileHandle;
78 VOID *PeCoffImage;
79 EFI_PEI_CORE_ENTRY_POINT EntryPoint;
80 EFI_PEI_PPI_DESCRIPTOR *Ppi;
81 EFI_PEI_PPI_DESCRIPTOR *SecPpiList;
82 UINTN SecReseveredMemorySize;
83 UINTN Index;
84
85 EMU_MAGIC_PAGE()->PpiList = PpiList;
86 ProcessLibraryConstructorList ();
87
88 DEBUG ((EFI_D_ERROR, "SEC Has Started\n"));
89
90 //
91 // Add Our PPIs to the list
92 //
93 SecReseveredMemorySize = sizeof (gPrivateDispatchTable);
94 for (Ppi = PpiList, Index = 1; ; Ppi++, Index++) {
95 SecReseveredMemorySize += sizeof (EFI_PEI_PPI_DESCRIPTOR);
96
97 if ((Ppi->Flags & EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) == EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) {
98 // Since we are appending, need to clear out privious list terminator.
99 Ppi->Flags &= ~EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST;
100 break;
101 }
102 }
103
104 // Keep everything on a good alignment
105 SecReseveredMemorySize = ALIGN_VALUE (SecReseveredMemorySize, CPU_STACK_ALIGNMENT);
106
107 #if 0
108 // Tell the PEI Core to not use our buffer in temp RAM
109 SecPpiList = (EFI_PEI_PPI_DESCRIPTOR *)SecCoreData->PeiTemporaryRamBase;
110 SecCoreData->PeiTemporaryRamBase = (VOID *)((UINTN)SecCoreData->PeiTemporaryRamBase + SecReseveredMemorySize);
111 SecCoreData->PeiTemporaryRamSize -= SecReseveredMemorySize;
112 #else
113 {
114 //
115 // When I subtrack from SecCoreData->PeiTemporaryRamBase PEI Core crashes? Either there is a bug
116 // or I don't understand temp RAM correctly?
117 //
118 EFI_PEI_PPI_DESCRIPTOR PpiArray[10];
119
120 SecPpiList = &PpiArray[0];
121 ASSERT (sizeof (PpiArray) >= SecReseveredMemorySize);
122 }
123 #endif
124 // Copy existing list, and append our entries.
125 CopyMem (SecPpiList, PpiList, sizeof (EFI_PEI_PPI_DESCRIPTOR) * Index);
126 CopyMem (&SecPpiList[Index], gPrivateDispatchTable, sizeof (gPrivateDispatchTable));
127
128 // Find PEI Core and transfer control
129 VolumeHandle = (EFI_PEI_FV_HANDLE)(UINTN)SecCoreData->BootFirmwareVolumeBase;
130 FileHandle = NULL;
131 Status = PeiServicesFfsFindNextFile (EFI_FV_FILETYPE_PEI_CORE, VolumeHandle, &FileHandle);
132 ASSERT_EFI_ERROR (Status);
133
134 Status = PeiServicesFfsFindSectionData (EFI_SECTION_PE32, FileHandle, &PeCoffImage);
135 ASSERT_EFI_ERROR (Status);
136
137 Status = PeCoffLoaderGetEntryPoint (PeCoffImage, (VOID **)&EntryPoint);
138 ASSERT_EFI_ERROR (Status);
139
140 // Transfer control to PEI Core
141 EntryPoint (SecCoreData, SecPpiList);
142
143 // PEI Core never returns
144 ASSERT (FALSE);
145 return;
146 }
147
148
149
150