projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| bc252e8e EB |
1 | ;------------------------------------------------------------------------------\r |
| 2 | ; @file\r | |
| 3 | ; Main routine of the pre-SEC code up through the jump into SEC\r | |
| 4 | ;\r | |
| 01a1c0fc | 5 | ; Copyright (c) 2008 - 2009, Intel Corporation. All rights reserved.<BR>\r |
| 0acd8697 | 6 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| bc252e8e EB |
7 | ;\r |
| 8 | ;------------------------------------------------------------------------------\r | |
| 9 | \r | |
| 10 | \r | |
| 11 | BITS 16\r | |
| 12 | \r | |
| 13 | ;\r | |
| 14 | ; Modified: EBX, ECX, EDX, EBP\r | |
| 15 | ;\r | |
| 16 | ; @param[in,out] RAX/EAX Initial value of the EAX register\r | |
| 17 | ; (BIST: Built-in Self Test)\r | |
| 18 | ; @param[in,out] DI 'BP': boot-strap processor, or\r | |
| 19 | ; 'AP': application processor\r | |
| 20 | ; @param[out] RBP/EBP Address of Boot Firmware Volume (BFV)\r | |
| 9f75aacc LE |
21 | ; @param[out] DS Selector allowing flat access to all addresses\r |
| 22 | ; @param[out] ES Selector allowing flat access to all addresses\r | |
| 23 | ; @param[out] FS Selector allowing flat access to all addresses\r | |
| 24 | ; @param[out] GS Selector allowing flat access to all addresses\r | |
| 25 | ; @param[out] SS Selector allowing flat access to all addresses\r | |
| bc252e8e EB |
26 | ;\r |
| 27 | ; @return None This routine jumps to SEC and does not return\r | |
| 28 | ;\r | |
| 29 | Main16:\r | |
| 30 | OneTimeCall EarlyInit16\r | |
| 31 | \r | |
| 32 | ;\r | |
| 33 | ; Transition the processor from 16-bit real mode to 32-bit flat mode\r | |
| 34 | ;\r | |
| 35 | OneTimeCall TransitionFromReal16To32BitFlat\r | |
| 36 | \r | |
| 37 | BITS 32\r | |
| 38 | \r | |
| 39 | ;\r | |
| 40 | ; Search for the Boot Firmware Volume (BFV)\r | |
| 41 | ;\r | |
| 42 | OneTimeCall Flat32SearchForBfvBase\r | |
| 43 | \r | |
| 44 | ;\r | |
| 45 | ; EBP - Start of BFV\r | |
| 46 | ;\r | |
| 47 | \r | |
| 48 | ;\r | |
| 49 | ; Search for the SEC entry point\r | |
| 50 | ;\r | |
| 51 | OneTimeCall Flat32SearchForSecEntryPoint\r | |
| 52 | \r | |
| 53 | ;\r | |
| 54 | ; ESI - SEC Core entry point\r | |
| 55 | ; EBP - Start of BFV\r | |
| 56 | ;\r | |
| 57 | \r | |
| 58 | %ifdef ARCH_IA32\r | |
| 59 | \r | |
| 60 | ;\r | |
| 61 | ; Restore initial EAX value into the EAX register\r | |
| 62 | ;\r | |
| 63 | mov eax, esp\r | |
| 64 | \r | |
| 65 | ;\r | |
| 66 | ; Jump to the 32-bit SEC entry point\r | |
| 67 | ;\r | |
| 68 | jmp esi\r | |
| 69 | \r | |
| 70 | %else\r | |
| 71 | \r | |
| 72 | ;\r | |
| 73 | ; Transition the processor from 32-bit flat mode to 64-bit flat mode\r | |
| 74 | ;\r | |
| 75 | OneTimeCall Transition32FlatTo64Flat\r | |
| 76 | \r | |
| 77 | BITS 64\r | |
| 78 | \r | |
| 79 | ;\r | |
| 80 | ; Some values were calculated in 32-bit mode. Make sure the upper\r | |
| 81 | ; 32-bits of 64-bit registers are zero for these values.\r | |
| 82 | ;\r | |
| 83 | mov rax, 0x00000000ffffffff\r | |
| 84 | and rsi, rax\r | |
| 85 | and rbp, rax\r | |
| 86 | and rsp, rax\r | |
| 87 | \r | |
| 88 | ;\r | |
| 89 | ; RSI - SEC Core entry point\r | |
| 90 | ; RBP - Start of BFV\r | |
| 91 | ;\r | |
| 92 | \r | |
| 93 | ;\r | |
| 94 | ; Restore initial EAX value into the RAX register\r | |
| 95 | ;\r | |
| 96 | mov rax, rsp\r | |
| 97 | \r | |
| 98 | ;\r | |
| 99 | ; Jump to the 64-bit SEC entry point\r | |
| 100 | ;\r | |
| 101 | jmp rsi\r | |
| 102 | \r | |
| 103 | %endif\r | |
| 104 | \r | |
| 105 | \r |