187 lines
2.4 KiB
ArmAsm
Executable File
187 lines
2.4 KiB
ArmAsm
Executable File
[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_ALIGN equ 1<<0
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MULTIBOOT_MEM equ 1<<1
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MULTIBOOT_AOUT equ 1<<16
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MULTIBOOT_MAGIC equ 0x1BADB002
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MULTIBOOT_FLAGS equ MULTIBOOT_ALIGN | MULTIBOOT_MEM | MULTIBOOT_AOUT
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MULTIBOOT_CHECKSUM equ -(MULTIBOOT_MAGIC + MULTIBOOT_FLAGS)
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EXTERN code, bss, end
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dd MULTIBOOT_MAGIC
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dd MULTIBOOT_FLAGS
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dd MULTIBOOT_CHECKSUM
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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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stublet:
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EXTERN kernel_main
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call kernel_main
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jmp $
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[GLOBAL load_gdt] ; Allows the C code to call gdt_flush().
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[EXTERN gp]
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load_gdt:
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lgdt [gp] ; Load the new GDT pointer
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mov ax, 0x10 ; 0x10 is the offset in the GDT to our data segment
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mov ds, ax ; Load all data segment selectors
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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:flush ; 0x08 is the offset to our code segment: Far jump!
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flush:
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ret
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%macro ISR 1
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global isr%1
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isr%1:
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cli
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push byte 0
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push byte %1
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jmp isr_common
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%endmacro
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%macro ISR_ERR 1
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global isr%1
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isr%1:
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cli
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push byte %1
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jmp isr_common
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%endmacro
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%macro IRQ 2
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global irq%1
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irq%1:
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cli
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push byte 0
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push byte %2
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jmp irq_common
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%endmacro
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ISR 0
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ISR 1
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ISR 2
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ISR 3
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ISR 4
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ISR 5
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ISR 6
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ISR 7
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ISR_ERR 8
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ISR 9
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ISR_ERR 10
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ISR_ERR 11
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ISR_ERR 12
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ISR_ERR 13
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ISR_ERR 14
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ISR 15
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ISR 16
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ISR_ERR 17
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ISR 18
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ISR 19
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ISR 20
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ISR 21
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ISR 22
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ISR 23
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ISR 24
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ISR 25
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ISR 26
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ISR 27
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ISR 28
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ISR 29
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ISR_ERR 30
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ISR 31
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IRQ 0, 32
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IRQ 1, 33
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IRQ 2, 34
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IRQ 3, 35
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IRQ 4, 36
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IRQ 5, 37
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IRQ 6, 38
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IRQ 7, 39
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IRQ 8, 40
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IRQ 9, 41
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IRQ 10, 42
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IRQ 11, 43
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IRQ 12, 44
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IRQ 13, 45
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IRQ 14, 46
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IRQ 15, 47
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extern fault_handler
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isr_common:
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pusha
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push ds
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push es
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push fs
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push gs
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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 eax, esp
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push eax
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mov eax, fault_handler
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call eax
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pop eax
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pop gs
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pop fs
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pop es
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pop ds
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popa
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add esp, 8
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iret
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extern irq_handler
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irq_common:
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pusha
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push ds
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push es
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push fs
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push gs
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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 eax, esp
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push eax
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mov eax, irq_handler
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call eax
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pop eax
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pop gs
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pop fs
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pop es
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pop ds
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popa
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add esp, 8
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iret
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[GLOBAL idt_load]
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idt_load:
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mov eax, [esp+4]
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lidt [eax]
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ret
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SECTION .bss
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resb 8192
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_sys_stack:
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