1 /** @file
2 Sample to provide SaveSecContext function.
3
4 Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
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
16 #include <PiPei.h>
17 #include <Library/DebugLib.h>
18
19 #include <Ppi/TopOfTemporaryRam.h>
20 #include <Ppi/SecPlatformInformation.h>
21
22 /**
23 Save BIST value before call FspInit.
24
25 @param[in] Bist BIST value.
26 **/
27 VOID
28 AsmSaveBistValue (
29 IN UINT32 Bist
30 );
31
32 /**
33 Save Ticker value before call FspInit.
34
35 @param[in] Ticker Ticker value.
36 **/
37 VOID
38 AsmSaveTickerValue (
39 IN UINT64 Ticker
40 );
41
42 /**
43 Save SEC context before call FspInit.
44
45 @param[in] PeiServices Pointer to PEI Services Table.
46 **/
47 VOID
48 EFIAPI
SaveSecContext(IN CONST EFI_PEI_SERVICES ** PeiServices)49 SaveSecContext (
50 IN CONST EFI_PEI_SERVICES **PeiServices
51 )
52 {
53 UINT32 *Bist;
54 UINT64 *Ticker;
55 UINT32 Size;
56 UINT32 Count;
57 UINT32 TopOfTemporaryRam;
58 VOID *TopOfTemporaryRamPpi;
59 EFI_STATUS Status;
60
61 DEBUG ((DEBUG_INFO, "SaveSecContext - 0x%x\n", PeiServices));
62
63 Status = (*PeiServices)->LocatePpi (
64 PeiServices,
65 &gTopOfTemporaryRamPpiGuid,
66 0,
67 NULL,
68 (VOID **) &TopOfTemporaryRamPpi
69 );
70 if (EFI_ERROR (Status)) {
71 return ;
72 }
73
74 DEBUG ((DEBUG_INFO, "TopOfTemporaryRamPpi - 0x%x\n", TopOfTemporaryRamPpi));
75
76 //
77 // The entries of BIST information, together with the number of them,
78 // reside in the bottom of stack, left untouched by normal stack operation.
79 // This routine copies the BIST information to the buffer pointed by
80 // PlatformInformationRecord for output.
81 //
82 // |--------------| <- TopOfTemporaryRam
83 // |Number of BSPs|
84 // |--------------|
85 // | BIST |
86 // |--------------|
87 // | .... |
88 // |--------------|
89 // | TSC[63:32] |
90 // |--------------|
91 // | TSC[31:00] |
92 // |--------------|
93 //
94
95 TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof(UINT32);
96 TopOfTemporaryRam -= sizeof(UINT32) * 2;
97 DEBUG ((DEBUG_INFO, "TopOfTemporaryRam - 0x%x\n", TopOfTemporaryRam));
98 Count = *(UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32));
99 DEBUG ((DEBUG_INFO, "Count - 0x%x\n", Count));
100 Size = Count * sizeof (IA32_HANDOFF_STATUS);
101 DEBUG ((DEBUG_INFO, "Size - 0x%x\n", Size));
102
103 Bist = (UINT32 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32) - Size);
104 DEBUG ((DEBUG_INFO, "Bist - 0x%x\n", *Bist));
105 Ticker = (UINT64 *)(UINTN)(TopOfTemporaryRam - sizeof(UINT32) - Size - sizeof(UINT64));
106 DEBUG ((DEBUG_INFO, "Ticker - 0x%lx\n", *Ticker));
107
108 // Just need record BSP
109 AsmSaveBistValue (*Bist);
110 AsmSaveTickerValue (*Ticker);
111 }
112