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/*
* 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:
#if !IS_ENABLED(CONFIG_USE_MARCH_586)
/* MMX registers required here */
/* BIST result in eax */
movl %eax, %ebx
/* Get an early timestamp */
rdtsc
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
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