1#include "../common/asm.h" 2#include <asm/apu_boot.h> 3 4 5.align 0x1000 // 按照4k对齐 6 7.section .text 8.code16 9 10ENTRY(_apu_boot_start) 11_apu_boot_base = . 12 cli 13 wbinvd // 将处理器缓存同步到内存中 14 15 mov %cs, %ax 16 mov %ax, %ds 17 mov %ax, %es 18 mov %ax, %ss 19 mov %ax, %fs 20 mov %ax, %gs 21 22 // 设置栈指针 23 movl $(_apu_boot_tmp_stack_end - _apu_boot_base), %esp 24 25 // 计算ap处理器引导程序的基地址 26 mov %cs, %ax 27 movzx %ax, %esi 28 shll $4, %esi 29 30 31 // set gdt and 32bit/64bit code addr 32 33 leal (_apu_code32 - _apu_boot_base)(%esi), %eax 34 movl %eax, (_apu_code32_vector - _apu_boot_base) 35 36 leal (_apu_code64 - _apu_boot_base)(%esi), %eax 37 movl %eax, (_apu_code64_vector - _apu_boot_base) 38 39 leal (_apu_tmp_gdt - _apu_boot_base)(%esi), %eax 40 movl %eax, (_apu_tmp_gdt + 2 - _apu_boot_base) 41 42// 从实模式切换到保护模式 43 44 lidtl _apu_tmp_idt - _apu_boot_base 45 lgdtl _apu_tmp_gdt - _apu_boot_base 46 47 // 操作cr0控制器，使能保护模式 48 smsw %ax 49 bts $0, %ax 50 lmsw %ax 51 52 // 转到保护模式 53 ljmpl *(_apu_code32_vector - _apu_boot_base) 54 55 56.code32 57.align 0x1000 58_apu_code32: 59 # 转到长模式 60 61 mov $0x10, %ax 62 mov %ax, %ds 63 mov %ax, %es 64 mov %ax, %ss 65 mov %ax, %fs 66 mov %ax, %gs 67 68// 设置栈指针 69 leal (_apu_boot_tmp_stack_end - _apu_boot_base)(%esi), %eax 70 movl %eax, %esp 71 72 // 1. 允许 PAE 73 mov %cr4, %eax 74 or $(1<<5), %eax 75 mov %eax, %cr4 76 77 movl $enter_head_from_ap_boot, %eax 78 jmpl *%eax 79 hlt 80 81 82 83.code64 84.align 0x1000 85_apu_code64: 86 87 hlt 88 89 90.align 0x1000 91_apu_tmp_idt: 92 .word 0 93 .word 0,0 94 95.align 0x1000 96_apu_tmp_gdt: 97 .short _apu_tmp_gdt_end - _apu_tmp_gdt -1 98 .long _apu_tmp_gdt - _apu_boot_base 99 .short 0 100 .quad 0x00cf9a000000ffff 101 .quad 0x00cf92000000ffff 102 .quad 0x0020980000000000 103 .quad 0x0000920000000000 104_apu_tmp_gdt_end: 105 106.align 0x1000 107_apu_code32_vector: 108 .long _apu_code32 - _apu_boot_base 109 .word 0x08,0 110 111.align 0x1000 112_apu_code64_vector: 113 .long _apu_code64 - _apu_boot_base 114 .word 0x18,0 115 116.align 0x1000 117ENTRY(_apu_boot_tmp_stack_start) 118 .skip APU_BOOT_TMP_STACK_SIZE 119_apu_boot_tmp_stack_end: 120 121ENTRY(_apu_boot_end) 122 123