1#include "../common/asm.h" 2 3 4.align 0x1000 // 按照4k对齐 5 6.section .text 7.code16 8 9ENTRY(_apu_boot_start) 10_apu_boot_base = . 11 cli 12 wbinvd // 将处理器缓存同步到内存中 13 14 mov %cs, %ax 15 mov %ax, %ds 16 mov %ax, %es 17 mov %ax, %ss 18 mov %ax, %fs 19 mov %ax, %gs 20 21 // 设置栈指针 22 movl $(_apu_boot_tmp_stack_end - _apu_boot_base), %esp 23 24 // 计算ap处理器引导程序的基地址 25 mov %cs, %ax 26 movzx %ax, %esi 27 shll $4, %esi 28 29 30 // set gdt and 32bit/64bit code addr 31 32 leal (_apu_code32 - _apu_boot_base)(%esi), %eax 33 movl %eax, (_apu_code32_vector - _apu_boot_base) 34 35 leal (_apu_code64 - _apu_boot_base)(%esi), %eax 36 movl %eax, (_apu_code64_vector - _apu_boot_base) 37 38 leal (_apu_tmp_gdt - _apu_boot_base)(%esi), %eax 39 movl %eax, (_apu_tmp_gdt + 2 - _apu_boot_base) 40 41// 从实模式切换到保护模式 42 43 lidtl _apu_tmp_idt - _apu_boot_base 44 lgdtl _apu_tmp_gdt - _apu_boot_base 45 46 // 操作cr0控制器，使能保护模式 47 smsw %ax 48 bts $0, %ax 49 lmsw %ax 50 51 // 转到保护模式 52 ljmpl *(_apu_code32_vector - _apu_boot_base) 53 54 55.code32 56.align 0x1000 57_apu_code32: 58 # 转到长模式 59 60 mov $0x10, %ax 61 mov %ax, %ds 62 mov %ax, %es 63 mov %ax, %ss 64 mov %ax, %fs 65 mov %ax, %gs 66 67// 设置栈指针 68 leal (_apu_boot_tmp_stack_end - _apu_boot_base)(%esi), %eax 69 movl %eax, %esp 70 71 // 1. 允许 PAE 72 mov %cr4, %eax 73 or $(1<<5), %eax 74 mov %eax, %cr4 75 76 movl $enter_head_from_ap_boot, %eax 77 jmpl *%eax 78 hlt 79 80 81 82.code64 83.align 0x1000 84_apu_code64: 85 86 hlt 87 88 89.align 0x1000 90_apu_tmp_idt: 91 .word 0 92 .word 0,0 93 94.align 0x1000 95_apu_tmp_gdt: 96 .short _apu_tmp_gdt_end - _apu_tmp_gdt -1 97 .long _apu_tmp_gdt - _apu_boot_base 98 .short 0 99 .quad 0x00cf9a000000ffff 100 .quad 0x00cf92000000ffff 101 .quad 0x0020980000000000 102 .quad 0x0000920000000000 103_apu_tmp_gdt_end: 104 105.align 0x1000 106_apu_code32_vector: 107 .long _apu_code32 - _apu_boot_base 108 .word 0x08,0 109 110.align 0x1000 111_apu_code64_vector: 112 .long _apu_code64 - _apu_boot_base 113 .word 0x18,0 114 115.align 0x1000 116_apu_boot_tmp_stack_start: 117// .org 0x400 118_apu_boot_tmp_stack_end: 119 120ENTRY(_apu_boot_end) 121 122