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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* This is the modern bootblock. 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.
*
*/
#include <cpu/x86/cr.h>
.section .text._start
/*
* Include the old code for reset vector and protected mode entry. That code has
* withstood the test of time.
*/
#include <cpu/x86/16bit/entry16.inc>
#include <cpu/x86/16bit/reset16.inc>
#include <cpu/x86/32bit/entry32.inc>
#if 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 !CONFIG(USE_MARCH_586)
/* MMX registers required here */
/* BIST result in eax */
movd %eax, %mm0
/* Get an early timestamp */
rdtsc
movd %eax, %mm1
movd %edx, %mm2
#endif
#if CONFIG(SSE)
enable_sse:
mov %cr4, %eax
or $CR4_OSFXSR, %ax
mov %eax, %cr4
#endif /* CONFIG(SSE) */
/* We're done. Now it's up to platform-specific code */
jmp bootblock_pre_c_entry
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