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40 | # time. So we can just load the respective table registers and |
40 | # time. So we can just load the respective table registers and |
41 | # switch to protected mode. |
41 | # switch to protected mode. |
42 | # |
42 | # |
43 | kernel_image_start: |
43 | kernel_image_start: |
44 | cli |
44 | cli |
45 | xorw %ax,%ax |
45 | xorw %ax, %ax |
46 | movw %ax,%ds |
46 | movw %ax, %ds |
47 | movw %ax,%ss # initialize stack segment register |
47 | movw %ax, %ss # initialize stack segment register |
48 | movl $0x7c00,%esp # initialize stack pointer |
48 | movl $0x7c00, %esp # initialize stack pointer |
49 | 49 | ||
50 | call memmap_arch_init |
50 | call memmap_arch_init |
51 | 51 | ||
52 | lgdt gdtr # initialize Global Descriptor Table register |
52 | lgdt gdtr # initialize Global Descriptor Table register |
53 | 53 | ||
54 | movl %cr0,%eax |
54 | movl %cr0, %eax |
55 | orl $0x1,%eax |
55 | orl $0x1, %eax |
56 | movl %eax,%cr0 # switch to protected mode |
56 | movl %eax, %cr0 # switch to protected mode |
- | 57 | ||
57 | jmpl $8,$meeting_point |
58 | jmpl $8, $boot_image_start |
58 | 59 | ||
59 | .code32 |
60 | .code32 |
60 | .align 4 |
61 | .align 4 |
61 | multiboot_header: |
62 | multiboot_header: |
62 | .long MULTIBOOT_HEADER_MAGIC |
63 | .long MULTIBOOT_HEADER_MAGIC |
63 | .long MULTIBOOT_HEADER_FLAGS |
64 | .long MULTIBOOT_HEADER_FLAGS |
64 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
65 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
65 | .long multiboot_header |
66 | .long multiboot_header + BOOT_OFFSET |
66 | .long unmapped_ktext_start |
67 | .long unmapped_ktext_start + BOOT_OFFSET |
67 | .long 0 |
68 | .long 0 |
68 | .long 0 |
69 | .long 0 |
69 | .long multiboot_image_start |
70 | .long multiboot_image_start + BOOT_OFFSET |
- | 71 | ||
- | 72 | boot_image_start: |
|
- | 73 | movw $16, %ax |
|
- | 74 | movw %ax, %es |
|
- | 75 | movw %ax, %gs |
|
- | 76 | movw %ax, %fs |
|
- | 77 | movw %ax, %ds # kernel data + stack |
|
- | 78 | movw %ax, %ss |
|
- | 79 | ||
- | 80 | call map_kernel # map kernel and turn paging on |
|
- | 81 | ||
- | 82 | movb $0xd1, %al # enable A20 using the keyboard controller |
|
- | 83 | outb %al, $0x64 |
|
- | 84 | movb $0xdf, %al |
|
- | 85 | outb %al, $0x60 |
|
- | 86 | ||
- | 87 | movl $0x8000, %esi |
|
- | 88 | movl $0x8000 + BOOT_OFFSET, %edi |
|
- | 89 | movl $_hardcoded_kernel_size, %ecx |
|
- | 90 | cld |
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- | 91 | rep movsb |
|
- | 92 | ||
- | 93 | jmp protected |
|
70 | 94 | ||
71 | multiboot_image_start: |
95 | multiboot_image_start: |
72 | movl $0x7c00, %esp # initialize stack pointer |
96 | movl $0x7c00, %esp # initialize stack pointer |
73 | 97 | ||
74 | lgdt gdtr |
98 | lgdt gdtr |
75 | 99 | ||
76 | meeting_point: |
- | |
77 | movw $16,%ax |
100 | movw $16, %ax |
78 | movw %ax,%es |
101 | movw %ax, %es |
79 | movw %ax,%gs |
102 | movw %ax, %gs |
80 | movw %ax,%fs |
103 | movw %ax, %fs |
81 | movw %ax,%ds # kernel data + stack |
104 | movw %ax, %ds # kernel data + stack |
82 | movw %ax,%ss |
105 | movw %ax, %ss |
83 | 106 | ||
84 | call map_kernel # map kernel and turn paging on |
107 | call map_kernel # map kernel and turn paging on |
85 | 108 | ||
- | 109 | protected: |
|
86 | call main_bsp # never returns |
110 | call main_bsp # never returns |
87 | 111 | ||
88 | cli |
112 | cli |
89 | hlt |
113 | hlt |
90 | 114 |