20bbd81201
As discussed on the mailing list and voted upon, the coreboot project is going to move the majority of copyrights out of the headers and into an AUTHORS file. This will happen a bit at a time, as we'll be unifying license headers at the same time. Signed-off-by: Martin Roth <martin@coreboot.org> Change-Id: Ifd4329905847d9dd06de67b9a443c8ee50c0e7a7 Reviewed-on: https://review.coreboot.org/c/coreboot/+/35177 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
110 lines
2.2 KiB
ArmAsm
110 lines
2.2 KiB
ArmAsm
/*
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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; version 2 of the License.
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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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#define WAKEUP_BASE 0x600
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#define RELOCATED(x) (x - __wakeup + WAKEUP_BASE)
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/* CR0 bits */
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#define PE (1 << 0)
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#ifdef __x86_64__
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.code64
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#else
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.code32
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#endif
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.globl __wakeup
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__wakeup:
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#ifdef __x86_64__
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xor %rax,%rax
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mov %ss, %ax
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push %rax
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mov %rsp, %rax
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add $8, %rax
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push %rax
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pushfq
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push $0x10
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lea 3(%rip), %rax
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push %rax
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iretq
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.code32
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/* disable paging */
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mov %cr0, %eax
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btc $31, %eax
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mov %eax, %cr0
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/* disable long mode */
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mov $0xC0000080, %ecx
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rdmsr
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btc $8, %eax
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wrmsr
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#endif
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/* First prepare the jmp to the resume vector */
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mov 0x4(%esp), %eax /* vector */
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/* last 4 bits of linear addr are taken as offset */
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andw $0x0f, %ax
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movw %ax, (__wakeup_offset)
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mov 0x4(%esp), %eax
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/* the rest is taken as segment */
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shr $4, %eax
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movw %ax, (__wakeup_segment)
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/* Activate the right segment descriptor real mode. */
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ljmp $0x28, $RELOCATED(1f)
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1:
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.code16
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/* 16 bit code from here on... */
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/* Load the segment registers w/ properly configured
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* segment descriptors. They will retain these
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* configurations (limits, writability, etc.) once
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* protected mode is turned off.
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*/
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mov $0x30, %ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %fs
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mov %ax, %gs
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mov %ax, %ss
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/* Turn off protection */
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movl %cr0, %eax
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andl $~PE, %eax
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movl %eax, %cr0
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/* Now really going into real mode */
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ljmp $0, $RELOCATED(1f)
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1:
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movw $0x0, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %ss
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movw %ax, %fs
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movw %ax, %gs
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/* This is a FAR JMP to the OS waking vector. The C code changed
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* the address to be correct.
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*/
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.byte 0xea
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__wakeup_offset = RELOCATED(.)
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.word 0x0000
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__wakeup_segment = RELOCATED(.)
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.word 0x0000
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.globl __wakeup_size
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__wakeup_size:
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.long . - __wakeup
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