43 lines
710 B
ArmAsm
43 lines
710 B
ArmAsm
[BITS 32]
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section .text
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global setup_idt
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setup_idt:
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%assign i 0
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%rep 32
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extern isr %+ i
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mov eax, isr %+ i
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; offset (low)
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mov word [idt_entries + (i * 8)], ax
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; segment selector (kernel code)
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mov word [idt_entries + (i * 8) + 2], 0x08
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; zero (skip)
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; attr: 1 (Present) 00 (DPL) 0 1 (D: 32bits) 110
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mov byte [idt_entries + (i * 8) + 5], 0x8E
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; offset (high)
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shr eax, 16
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mov word [idt_entries + (i * 8) + 6], ax
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%assign i i+1
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%endrep
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lidt [idt_ptr]
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sti
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ret
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section .data
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align 8
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idt_ptr:
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dw 255 * 8
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dd idt_entries
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align 8
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idt_entries:
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times 256 dd 0x00000000, 0x00000000
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;; dw offset (low)
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;; dw segment selector
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;; db zero
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;; db attr | P | DPL | 0 D 1 1 0 |
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;; dw offset (high)
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.end:
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