2011-01-16 04:01:19 +03:00
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[BITS 32]
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global start
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start:
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mov esp, _sys_stack
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jmp stublet
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ALIGN 4
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mboot:
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MULTIBOOT_PAGE_ALIGN equ 1<<0
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MULTIBOOT_MEMORY_INFO equ 1<<1
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MULTIBOOT_AOUT_KLUDGE equ 1<<16
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MULTIBOOT_HEADER_MAGIC equ 0x1BADB002
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MULTIBOOT_HEADER_FLAGS equ MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO | MULTIBOOT_AOUT_KLUDGE
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MULTIBOOT_CHECKSUM equ -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
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EXTERN code, bss, end
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; GRUB Multiboot header, boot signature
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dd MULTIBOOT_HEADER_MAGIC
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dd MULTIBOOT_HEADER_FLAGS
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dd MULTIBOOT_CHECKSUM
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; AOUT kludge (must be physical addresses)
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; Linker script fills these in
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dd mboot
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dd code
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dd bss
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dd end
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dd start
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; Main entrypoint
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stublet:
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extern main
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call main
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jmp $
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2011-01-16 06:11:17 +03:00
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; Global Descriptor Table
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2011-01-16 04:59:11 +03:00
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global gdt_flush
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extern gp
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gdt_flush:
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lgdt [gp]
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mov ax, 0x10
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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jmp 0x08:flush2
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flush2:
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ret
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2011-01-16 04:01:19 +03:00
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2011-01-16 06:11:17 +03:00
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; Interrupt Descriptor Table
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global idt_load
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extern idtp
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idt_load:
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lidt [idtp]
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ret
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2011-01-16 04:01:19 +03:00
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; Interrupt Service Routines
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2011-01-16 06:11:17 +03:00
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2011-01-16 04:01:19 +03:00
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; BSS Section
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SECTION .bss
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resb 8192 ; 8KB of memory reserved
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_sys_stack:
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; This line intentionally left blank
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