| /* |
| * This is the modern bootblock. It is used by platforms which select |
| * C_ENVIRONMENT_BOOTBLOCK, and it prepares the system for C environment runtime |
| * setup. The actual setup is done by hardware-specific code. |
| * |
| * It provides a bootflow similar to other architectures, and thus is considered |
| * to be the modern approach. |
| * |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2015 Alexandru Gagniuc <mr.nuke.me@gmail.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <cpu/x86/cr.h> |
| |
| /* |
| * Include the old code for reset vector and protected mode entry. That code has |
| * withstood the test of time. |
| */ |
| #include <arch/x86/prologue.inc> |
| #include <cpu/x86/16bit/entry16.inc> |
| #include <cpu/x86/16bit/reset16.inc> |
| #include <cpu/x86/32bit/entry32.inc> |
| |
| #if IS_ENABLED(CONFIG_BOOTBLOCK_DEBUG_SPINLOOP) |
| |
| /* Wait for a JTAG debugger to break in and set EBX non-zero */ |
| xor %ebx, %ebx |
| |
| debug_spinloop: |
| cmp $0, %ebx |
| jz debug_spinloop |
| #endif |
| |
| bootblock_protected_mode_entry: |
| |
| /* BIST result in eax */ |
| movl %eax, %ebx |
| |
| /* Get an early timestamp */ |
| rdtsc |
| |
| #if IS_ENABLED(CONFIG_BOOTBLOCK_SAVE_BIST_AND_TIMESTAMP) |
| lea 1f, %ebp |
| |
| /* eax: Low 32-bits of timestamp |
| * ebx: BIST result |
| * ebp: return address |
| * edx: High 32-bits of timestamp |
| */ |
| jmp bootblock_save_bist_and_timestamp |
| 1: |
| #else |
| movd %ebx, %mm0 |
| movd %eax, %mm1 |
| movd %edx, %mm2 |
| #endif |
| |
| #if IS_ENABLED(CONFIG_SSE) |
| enable_sse: |
| mov %cr4, %eax |
| or $CR4_OSFXSR, %ax |
| mov %eax, %cr4 |
| #endif /* IS_ENABLED(CONFIG_SSE) */ |
| |
| /* We're done. Now it's up to platform-specific code */ |
| jmp bootblock_pre_c_entry |