46 lines
1.2 KiB
ArmAsm
46 lines
1.2 KiB
ArmAsm
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/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/*
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* input %esp: return address (not pointer to return address!)
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* clobber the content of eax, ecx, edx
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*/
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#include <cpu/x86/mtrr.h>
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.section .text
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.global check_mtrr
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check_mtrr:
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/* Use the MTRR default type MSR as a proxy for detecting INIT#.
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* Reset the system if any known bits are set in that MSR. That is
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* an indication of the CPU not being properly reset. */
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check_for_clean_reset:
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movl $MTRR_DEF_TYPE_MSR, %ecx
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rdmsr
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andl $(MTRR_DEF_TYPE_EN | MTRR_DEF_TYPE_FIX_EN), %eax
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cmp $0, %eax
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jnz warm_reset
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jmp *%esp
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/* perform warm reset */
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warm_reset:
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movw $0xcf9, %dx
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movb $0x06, %al
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outb %al, %dx
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/* Should not reach this*/
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.Lhlt:
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hlt
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jmp .Lhlt
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