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25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | # |
27 | # |
28 | 28 | ||
29 | #include <arch/boot/boot.h> |
29 | #include <arch/boot/boot.h> |
- | 30 | #include <arch/boot/memmapasm.h> |
|
30 | 31 | ||
31 | .section K_TEXT_START |
32 | .section K_TEXT_START |
32 | .global kernel_image_start |
33 | .global kernel_image_start |
33 | 34 | ||
34 | KTEXT=8 |
35 | KTEXT=8 |
Line 78... | Line 79... | ||
78 | movw %ax, %gs |
79 | movw %ax, %gs |
79 | movw %ax, %fs |
80 | movw %ax, %fs |
80 | movw %ax, %ds # kernel data + stack |
81 | movw %ax, %ds # kernel data + stack |
81 | movw %ax, %ss |
82 | movw %ax, %ss |
82 | 83 | ||
83 | call map_kernel # map kernel and turn paging on |
- | |
84 | - | ||
85 | movb $0xd1, %al # enable A20 using the keyboard controller |
84 | movb $0xd1, %al # enable A20 using the keyboard controller |
86 | outb %al, $0x64 |
85 | outb %al, $0x64 |
87 | movb $0xdf, %al |
86 | movb $0xdf, %al |
88 | outb %al, $0x60 |
87 | outb %al, $0x60 |
89 | 88 | ||
Line 91... | Line 90... | ||
91 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi |
90 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi |
92 | movl $_hardcoded_kernel_size, %ecx |
91 | movl $_hardcoded_kernel_size, %ecx |
93 | cld |
92 | cld |
94 | rep movsb |
93 | rep movsb |
95 | 94 | ||
- | 95 | call map_kernel # map kernel and turn paging on |
|
- | 96 | ||
96 | call main_bsp # never returns |
97 | call main_bsp # never returns |
97 | 98 | ||
98 | cli |
99 | cli |
99 | hlt |
100 | hlt |
100 | 101 | ||
Line 111... | Line 112... | ||
111 | movw %cx, %ss |
112 | movw %cx, %ss |
112 | 113 | ||
113 | jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET |
114 | jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET |
114 | multiboot_meeting_point: |
115 | multiboot_meeting_point: |
115 | 116 | ||
116 | pushl %ebx |
117 | pushl %ebx # save parameters from GRUB |
117 | pushl %eax |
118 | pushl %eax |
118 | 119 | ||
- | 120 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi |
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- | 121 | movl $BOOTSTRAP_OFFSET, %edi |
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- | 122 | movl $_hardcoded_unmapped_size, %ecx |
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- | 123 | cld |
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- | 124 | rep movsb |
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- | 125 | ||
119 | call map_kernel # map kernel and turn paging on |
126 | call map_kernel # map kernel and turn paging on |
120 | 127 | ||
121 | popl %eax |
128 | popl %eax |
122 | popl %ebx |
129 | popl %ebx |
123 | cmpl $MULTIBOOT_LOADER_MAGIC, %eax |
130 | cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature |
124 | je valid_boot |
131 | je valid_boot |
125 | 132 | ||
- | 133 | xorl %ecx, %ecx # no memory size or map available |
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- | 134 | movl %ecx, e801memorysize |
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126 | # ... |
135 | movl %ecx, e820counter |
127 | 136 | ||
128 | jmp invalid_boot |
137 | jmp invalid_boot |
129 | 138 | ||
130 | valid_boot: |
139 | valid_boot: |
131 | 140 | ||
132 | movl (%ebx), %eax |
141 | movl (%ebx), %eax # ebx = physical address of struct multiboot_info |
133 | 142 | ||
- | 143 | bt $0, %eax # mbi->flags[0] (mem_lower, mem_upper valid) |
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- | 144 | jc mem_valid |
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- | 145 | ||
134 | # ... check flags in eax |
146 | xorl %ecx, %ecx |
- | 147 | jmp mem_invalid |
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- | 148 | ||
- | 149 | mem_valid: |
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- | 150 | movl 4(%ebx), %ecx # mbi->mem_lower |
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- | 151 | addl 8(%ebx), %ecx # mbi->mem_upper |
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135 | 152 | ||
136 | movl 4(%ebx), %ecx |
153 | mem_invalid: |
137 | addl 8(%ebx), %ecx |
- | |
138 | movl %ecx, e801memorysize |
154 | movl %ecx, e801memorysize |
139 | 155 | ||
- | 156 | bt $6, %eax # mbi->flags[6] (mmap_length, mmap_addr valid) |
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- | 157 | jc mmap_valid |
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- | 158 | ||
140 | # movl 44(%ebx), %ecx |
159 | xorl %edx, %edx |
- | 160 | jmp mmap_invalid |
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- | 161 | ||
- | 162 | mmap_valid: |
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- | 163 | movl 44(%ebx), %ecx # mbi->mmap_length |
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- | 164 | movl 48(%ebx), %esi # mbi->mmap_addr |
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- | 165 | movl $e820table, %edi |
|
141 | xorl %ecx, %ecx |
166 | xorl %edx, %edx |
- | 167 | ||
- | 168 | mmap_loop: |
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- | 169 | cmpl $0, %ecx |
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- | 170 | jle mmap_end |
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- | 171 | ||
- | 172 | movl 4(%esi), %eax # mmap->base_addr_low |
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142 | movl %ecx, e820counter |
173 | movl %eax, (%edi) |
- | 174 | ||
- | 175 | movl 8(%esi), %eax # mmap->base_addr_high |
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143 | # movl 48(%ebx), %esi |
176 | movl %eax, 4(%edi) |
- | 177 | ||
- | 178 | movl 12(%esi), %eax # mmap->length_low |
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144 | # movl $e820table, %edi |
179 | movl %eax, 8(%edi) |
- | 180 | ||
- | 181 | movl 16(%esi), %eax # mmap->length_high |
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- | 182 | movl %eax, 12(%edi) |
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- | 183 | ||
- | 184 | movl 20(%esi), %eax # mmap->type |
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- | 185 | movl %eax, 16(%edi) |
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145 | # cld |
186 | |
- | 187 | movl (%esi), %eax # mmap->size |
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- | 188 | addl $0x4, %eax |
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- | 189 | addl %eax, %esi |
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- | 190 | subl %eax, %ecx |
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- | 191 | addl $MEMMAP_E820_RECORD_SIZE, %edi |
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- | 192 | incl %edx |
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146 | # rep movsb |
193 | jmp mmap_loop |
- | 194 | ||
- | 195 | mmap_end: |
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- | 196 | ||
- | 197 | mmap_invalid: |
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- | 198 | movl %edx, e820counter |
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147 | 199 | ||
148 | invalid_boot: |
200 | invalid_boot: |
149 | 201 | ||
150 | call main_bsp - BOOT_OFFSET # never returns |
202 | call main_bsp - BOOT_OFFSET # never returns |
151 | 203 |