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cf1d4549 JY |
1 | /** @file\r |
2 | Execute 32-bit code in Long Mode.\r | |
3 | Provide a thunk function to transition from long mode to compatibility mode to execute 32-bit code and then transit\r | |
4 | back to long mode.\r | |
5 | \r | |
14a6beac | 6 | Copyright (c) 2014 - 2018, Intel Corporation. All rights reserved.<BR>\r |
512e23a3 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
cf1d4549 JY |
8 | \r |
9 | **/\r | |
10 | \r | |
11 | #include <Uefi.h>\r | |
12 | #include <Library/BaseLib.h>\r | |
13 | #include <FspEas.h>\r | |
14 | \r | |
15 | #pragma pack(1)\r | |
16 | typedef union {\r | |
17 | struct {\r | |
7c7184e2 MK |
18 | UINT32 LimitLow : 16;\r |
19 | UINT32 BaseLow : 16;\r | |
20 | UINT32 BaseMid : 8;\r | |
21 | UINT32 Type : 4;\r | |
22 | UINT32 System : 1;\r | |
23 | UINT32 Dpl : 2;\r | |
24 | UINT32 Present : 1;\r | |
25 | UINT32 LimitHigh : 4;\r | |
26 | UINT32 Software : 1;\r | |
27 | UINT32 Reserved : 1;\r | |
28 | UINT32 DefaultSize : 1;\r | |
29 | UINT32 Granularity : 1;\r | |
30 | UINT32 BaseHigh : 8;\r | |
cf1d4549 | 31 | } Bits;\r |
7c7184e2 | 32 | UINT64 Uint64;\r |
cf1d4549 JY |
33 | } IA32_GDT;\r |
34 | #pragma pack()\r | |
35 | \r | |
7c7184e2 MK |
36 | GLOBAL_REMOVE_IF_UNREFERENCED IA32_GDT mGdtEntries[] = {\r |
37 | {\r | |
38 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }\r | |
39 | }, /* 0x0: reserve */\r | |
40 | {\r | |
41 | { 0xFFFF, 0, 0, 0xB, 1, 0, 1, 0xF, 0, 0, 1, 1, 0 }\r | |
42 | }, /* 0x8: compatibility mode */\r | |
43 | {\r | |
44 | { 0xFFFF, 0, 0, 0xB, 1, 0, 1, 0xF, 0, 1, 0, 1, 0 }\r | |
45 | }, /* 0x10: for long mode */\r | |
46 | {\r | |
47 | { 0xFFFF, 0, 0, 0x3, 1, 0, 1, 0xF, 0, 0, 1, 1, 0 }\r | |
48 | }, /* 0x18: data */\r | |
49 | {\r | |
50 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }\r | |
51 | }, /* 0x20: reserve */\r | |
cf1d4549 JY |
52 | };\r |
53 | \r | |
54 | //\r | |
55 | // IA32 Gdt register\r | |
56 | //\r | |
7c7184e2 | 57 | GLOBAL_REMOVE_IF_UNREFERENCED IA32_DESCRIPTOR mGdt = {\r |
cf1d4549 | 58 | sizeof (mGdtEntries) - 1,\r |
7c7184e2 MK |
59 | (UINTN)mGdtEntries\r |
60 | };\r | |
cf1d4549 JY |
61 | \r |
62 | /**\r | |
63 | Assembly function to transition from long mode to compatibility mode to execute 32-bit code and then transit back to\r | |
64 | long mode.\r | |
65 | \r | |
66 | @param[in] Function The 32bit code entry to be executed.\r | |
67 | @param[in] Param1 The first parameter to pass to 32bit code\r | |
68 | @param[in] Param2 The second parameter to pass to 32bit code\r | |
69 | @param[in] InternalGdtr The GDT and GDT descriptor used by this library\r | |
70 | \r | |
71 | @return status.\r | |
72 | **/\r | |
73 | UINT32\r | |
14a6beac | 74 | EFIAPI\r |
cf1d4549 JY |
75 | AsmExecute32BitCode (\r |
76 | IN UINT64 Function,\r | |
77 | IN UINT64 Param1,\r | |
78 | IN UINT64 Param2,\r | |
79 | IN IA32_DESCRIPTOR *InternalGdtr\r | |
80 | );\r | |
81 | \r | |
82 | /**\r | |
83 | Wrapper for a thunk to transition from long mode to compatibility mode to execute 32-bit code and then transit back to\r | |
84 | long mode.\r | |
85 | \r | |
86 | @param[in] Function The 32bit code entry to be executed.\r | |
87 | @param[in] Param1 The first parameter to pass to 32bit code.\r | |
88 | @param[in] Param2 The second parameter to pass to 32bit code.\r | |
89 | \r | |
90 | @return EFI_STATUS.\r | |
91 | **/\r | |
92 | EFI_STATUS\r | |
93 | Execute32BitCode (\r | |
7c7184e2 MK |
94 | IN UINT64 Function,\r |
95 | IN UINT64 Param1,\r | |
96 | IN UINT64 Param2\r | |
cf1d4549 JY |
97 | )\r |
98 | {\r | |
99 | EFI_STATUS Status;\r | |
100 | IA32_DESCRIPTOR Idtr;\r | |
101 | \r | |
102 | //\r | |
103 | // Idtr might be changed inside of FSP. 32bit FSP only knows the <4G address.\r | |
104 | // If IDTR.Base is >4G, FSP can not handle. So we need save/restore IDTR here for X64 only.\r | |
105 | // Interrupt is already disabled here, so it is safety to update IDTR.\r | |
106 | //\r | |
107 | AsmReadIdtr (&Idtr);\r | |
108 | Status = AsmExecute32BitCode (Function, Param1, Param2, &mGdt);\r | |
109 | AsmWriteIdtr (&Idtr);\r | |
110 | \r | |
111 | return Status;\r | |
112 | }\r |