56 lines
1.6 KiB
ArmAsm
56 lines
1.6 KiB
ArmAsm
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/*
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* This is the modern bootblock. It is used by platforms which select
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* C_ENVIRONMENT_BOOTBLOCK, and 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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* This file is part of the coreboot project.
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*
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* Copyright (C) 2015 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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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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#define CR0_MP (1 << 1)
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#define CR0_EM (1 << 2)
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#define CR4_OSFXSR (1 << 9)
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#define CR4_OSXMMEXCPT (1 << 10)
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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 <arch/x86/prologue.inc>
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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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bootblock_protected_mode_entry:
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/* Save BIST result */
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movd %eax, %mm0
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/* Save 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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#if !IS_ENABLED(CONFIG_SSE)
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enable_sse:
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mov %cr0, %eax
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and $~CR0_EM, %ax /* Clear coprocessor emulation CR0.EM */
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or $CR0_MP, %ax /* Set coprocessor monitoring CR0.MP */
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mov %eax, %cr0
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mov %cr4, %eax
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or $(CR4_OSFXSR | CR4_OSXMMEXCPT), %ax
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mov %eax, %cr4
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#endif /* IS_ENABLED(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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