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1 | /** @file\r |
2 | SMM STM support functions\r | |
3 | \r | |
4 | Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php.\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include <PiSmm.h>\r | |
16 | #include <Library/DebugLib.h>\r | |
17 | \r | |
18 | #include "SmmStm.h"\r | |
19 | \r | |
20 | ///\r | |
21 | /// Page Table Entry\r | |
22 | ///\r | |
23 | #define IA32_PG_P BIT0\r | |
24 | #define IA32_PG_RW BIT1\r | |
25 | #define IA32_PG_PS BIT7\r | |
26 | \r | |
27 | /**\r | |
28 | \r | |
29 | Create 4G page table for STM.\r | |
30 | 4M Non-PAE page table in IA32 version.\r | |
31 | \r | |
32 | @param PageTableBase The page table base in MSEG\r | |
33 | \r | |
34 | **/\r | |
35 | VOID\r | |
36 | StmGen4GPageTable (\r | |
37 | IN UINTN PageTableBase\r | |
38 | )\r | |
39 | {\r | |
40 | UINTN Index;\r | |
41 | UINT32 *Pte;\r | |
42 | UINT32 Address;\r | |
43 | \r | |
44 | Pte = (UINT32*)(UINTN)PageTableBase;\r | |
45 | \r | |
46 | Address = 0;\r | |
47 | for (Index = 0; Index < SIZE_4KB / sizeof (*Pte); Index++) {\r | |
48 | *Pte = Address | IA32_PG_PS | IA32_PG_RW | IA32_PG_P;\r | |
49 | Pte++;\r | |
50 | Address += SIZE_4MB;\r | |
51 | }\r | |
52 | }\r | |
53 | \r | |
54 | /**\r | |
55 | This is SMM exception handle.\r | |
56 | Consumed by STM when exception happen.\r | |
57 | \r | |
58 | @param Context STM protection exception stack frame\r | |
59 | \r | |
60 | @return the EBX value for STM reference.\r | |
61 | EBX = 0: resume SMM guest using register state found on exception stack.\r | |
62 | EBX = 1 to 0x0F: EBX contains a BIOS error code which the STM must record in the\r | |
63 | TXT.ERRORCODE register and subsequently reset the system via\r | |
64 | TXT.CMD.SYS_RESET. The value of the TXT.ERRORCODE register is calculated as\r | |
65 | follows: TXT.ERRORCODE = (EBX & 0x0F) | STM_CRASH_BIOS_PANIC\r | |
66 | EBX = 0x10 to 0xFFFFFFFF - reserved, do not use.\r | |
67 | \r | |
68 | **/\r | |
69 | UINT32\r | |
70 | EFIAPI\r | |
71 | SmmStmExceptionHandler (\r | |
72 | IN OUT STM_PROTECTION_EXCEPTION_STACK_FRAME Context\r | |
73 | )\r | |
74 | {\r | |
75 | // TBD - SmmStmExceptionHandler, record information\r | |
76 | DEBUG ((DEBUG_ERROR, "SmmStmExceptionHandler ...\n"));\r | |
77 | //\r | |
78 | // Skip this instruction and continue;\r | |
79 | //\r | |
80 | Context.Ia32StackFrame->Rip += Context.Ia32StackFrame->VmcsExitInstructionLength;\r | |
81 | \r | |
82 | return 0;\r | |
83 | }\r |