/* * 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