dc2f0e39ae
This fixes non-emulation platforms as those are using 32bit code after the bootblock_crt0 entry, like setting up CAR and updating microcode, which isn't yet converted to support long mode. This is a noop for the only supported x86_64 platform and all x86_32 platforms. Change-Id: I45e56ed8db9a44c00cd61e962bb82f27926eb23f Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37370 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
56 lines
1.1 KiB
ArmAsm
56 lines
1.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* This is the modern bootblock. It prepares the system for C environment runtime
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* setup. The actual setup is done by hardware-specific code.
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*
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* It provides a bootflow similar to other architectures, and thus is considered
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* to be the modern approach.
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*
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*/
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#include <cpu/x86/cr.h>
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.section .text
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/*
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* Include the old code for reset vector and protected mode entry. That code has
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* withstood the test of time.
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*/
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#include <cpu/x86/16bit/entry16.inc>
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#include <cpu/x86/16bit/reset16.inc>
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#include <cpu/x86/32bit/entry32.inc>
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#if CONFIG(BOOTBLOCK_DEBUG_SPINLOOP)
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/* Wait for a JTAG debugger to break in and set EBX non-zero */
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xor %ebx, %ebx
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debug_spinloop:
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cmp $0, %ebx
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jz debug_spinloop
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#endif
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bootblock_protected_mode_entry:
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#if !CONFIG(USE_MARCH_586)
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/* MMX registers required here */
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/* BIST result in eax */
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movd %eax, %mm0
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/* Get an early timestamp */
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rdtsc
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movd %eax, %mm1
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movd %edx, %mm2
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#endif
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#if CONFIG(SSE)
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enable_sse:
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mov %cr4, %eax
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or $CR4_OSFXSR, %ax
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mov %eax, %cr4
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#endif /* CONFIG(SSE) */
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/* We're done. Now it's up to platform-specific code */
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jmp bootblock_pre_c_entry
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