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https://github.com/DragonOS-Community/DragonOS.git
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122 lines
2.1 KiB
ArmAsm
122 lines
2.1 KiB
ArmAsm
#include "../common/asm.h"
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.align 0x1000 // 按照4k对齐
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.section .text
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.code16
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ENTRY(_apu_boot_start)
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_apu_boot_base = .
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cli
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wbinvd // 将处理器缓存同步到内存中
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mov %cs, %ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %ss
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mov %ax, %fs
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mov %ax, %gs
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// 设置栈指针
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movl $(_apu_boot_tmp_stack_end - _apu_boot_base), %esp
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// 计算ap处理器引导程序的基地址
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mov %cs, %ax
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movzx %ax, %esi
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shll $4, %esi
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// set gdt and 32bit/64bit code addr
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leal (_apu_code32 - _apu_boot_base)(%esi), %eax
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movl %eax, (_apu_code32_vector - _apu_boot_base)
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leal (_apu_code64 - _apu_boot_base)(%esi), %eax
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movl %eax, (_apu_code64_vector - _apu_boot_base)
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leal (_apu_tmp_gdt - _apu_boot_base)(%esi), %eax
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movl %eax, (_apu_tmp_gdt + 2 - _apu_boot_base)
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// 从实模式切换到保护模式
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lidtl _apu_tmp_idt - _apu_boot_base
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lgdtl _apu_tmp_gdt - _apu_boot_base
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// 操作cr0控制器，使能保护模式
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smsw %ax
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bts $0, %ax
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lmsw %ax
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// 转到保护模式
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ljmpl *(_apu_code32_vector - _apu_boot_base)
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.code32
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.align 0x1000
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_apu_code32:
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# 转到长模式
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mov $0x10, %ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %ss
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mov %ax, %fs
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mov %ax, %gs
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// 设置栈指针
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leal (_apu_boot_tmp_stack_end - _apu_boot_base)(%esi), %eax
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movl %eax, %esp
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// 1. 允许 PAE
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mov %cr4, %eax
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or $(1<<5), %eax
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mov %eax, %cr4
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movl $enter_head_from_ap_boot, %eax
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jmpl *%eax
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hlt
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.code64
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.align 0x1000
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_apu_code64:
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hlt
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.align 0x1000
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_apu_tmp_idt:
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.word 0
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.word 0,0
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.align 0x1000
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_apu_tmp_gdt:
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.short _apu_tmp_gdt_end - _apu_tmp_gdt -1
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.long _apu_tmp_gdt - _apu_boot_base
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.short 0
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.quad 0x00cf9a000000ffff
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.quad 0x00cf92000000ffff
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.quad 0x0020980000000000
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.quad 0x0000920000000000
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_apu_tmp_gdt_end:
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.align 0x1000
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_apu_code32_vector:
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.long _apu_code32 - _apu_boot_base
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.word 0x08,0
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.align 0x1000
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_apu_code64_vector:
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.long _apu_code64 - _apu_boot_base
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.word 0x18,0
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.align 0x1000
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_apu_boot_tmp_stack_start:
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// .org 0x400
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_apu_boot_tmp_stack_end:
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ENTRY(_apu_boot_end)
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