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[mirror_edk2.git] / UefiCpuPkg / ResetVector / Vtf0 / Main.asm
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1;------------------------------------------------------------------------------\r
2; @file\r
3; Main routine of the pre-SEC code up through the jump into SEC\r
4;\r
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5; Copyright (c) 2008 - 2009, Intel Corporation. All rights reserved.<BR>\r
6; This program and the accompanying materials\r
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7; are licensed and made available under the terms and conditions of the BSD License\r
8; which accompanies this distribution. The full text of the license may be found at\r
9; http://opensource.org/licenses/bsd-license.php\r
10;\r
11; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
12; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
13;\r
14;------------------------------------------------------------------------------\r
15\r
16\r
17BITS 16\r
18\r
19;\r
20; Modified: EBX, ECX, EDX, EBP\r
21;\r
22; @param[in,out] RAX/EAX Initial value of the EAX register\r
23; (BIST: Built-in Self Test)\r
24; @param[in,out] DI 'BP': boot-strap processor, or\r
25; 'AP': application processor\r
26; @param[out] RBP/EBP Address of Boot Firmware Volume (BFV)\r
27;\r
28; @return None This routine jumps to SEC and does not return\r
29;\r
30Main16:\r
31 OneTimeCall EarlyInit16\r
32\r
33 ;\r
34 ; Transition the processor from 16-bit real mode to 32-bit flat mode\r
35 ;\r
36 OneTimeCall TransitionFromReal16To32BitFlat\r
37\r
38BITS 32\r
39\r
40 ;\r
41 ; Search for the Boot Firmware Volume (BFV)\r
42 ;\r
43 OneTimeCall Flat32SearchForBfvBase\r
44\r
45 ;\r
46 ; EBP - Start of BFV\r
47 ;\r
48\r
49 ;\r
50 ; Search for the SEC entry point\r
51 ;\r
52 OneTimeCall Flat32SearchForSecEntryPoint\r
53\r
54 ;\r
55 ; ESI - SEC Core entry point\r
56 ; EBP - Start of BFV\r
57 ;\r
58\r
59%ifdef ARCH_IA32\r
60\r
61 ;\r
62 ; Restore initial EAX value into the EAX register\r
63 ;\r
64 mov eax, esp\r
65\r
66 ;\r
67 ; Jump to the 32-bit SEC entry point\r
68 ;\r
69 jmp esi\r
70\r
71%else\r
72\r
73 ;\r
74 ; Transition the processor from 32-bit flat mode to 64-bit flat mode\r
75 ;\r
76 OneTimeCall Transition32FlatTo64Flat\r
77\r
78BITS 64\r
79\r
80 ;\r
81 ; Some values were calculated in 32-bit mode. Make sure the upper\r
82 ; 32-bits of 64-bit registers are zero for these values.\r
83 ;\r
84 mov rax, 0x00000000ffffffff\r
85 and rsi, rax\r
86 and rbp, rax\r
87 and rsp, rax\r
88\r
89 ;\r
90 ; RSI - SEC Core entry point\r
91 ; RBP - Start of BFV\r
92 ;\r
93\r
94 ;\r
95 ; Restore initial EAX value into the RAX register\r
96 ;\r
97 mov rax, rsp\r
98\r
99 ;\r
100 ; Jump to the 64-bit SEC entry point\r
101 ;\r
102 jmp rsi\r
103\r
104%endif\r
105\r
106\r