116 lines
1.9 KiB
ArmAsm
116 lines
1.9 KiB
ArmAsm
#define ASM_FILE 1
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#include <config.h>
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#include <multiboot.h>
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.section .text.boot
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.global _start
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_start:
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jmp _start2
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.align MULTIBOOT_HEADER_ALIGN
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.int MULTIBOOT_HEADER_MAGIC
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.int 0x0
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.int -(MULTIBOOT_HEADER_MAGIC)
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.align MULTIBOOT_HEADER_ALIGN
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.extern start
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_start2:
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lgdt gdtr
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mov $0x10, %cx
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mov %cx, %ds
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mov %cx, %es
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mov %cx, %fs
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mov %cx, %gs
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mov %cx, %ss
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ljmp $0x08, $_start3
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_start3:
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mov $kernel_stack, %esp //Initialize Stack
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push %ebx
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push %eax //Push arguments to start()
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#ifdef ENABLE_FPU
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finit //Enable FPU
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#endif
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#ifdef ENABLE_SSE
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//Check for SSE
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mov $1, %eax
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cpuid
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test $1<<25, %edx
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jz _noSSE
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mov %cr0, %eax
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and $0xFFFB, %ax
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or $0x2, %ax
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mov %eax, %cr0
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mov %cr4, %eax
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or $3<<9, %ax
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mov %eax, %cr4
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_noSSE:
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#endif
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call start
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_stop:
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cli
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hlt
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jmp _stop
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.section .data
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gdtr:
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.word 9 * 8
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.int gdt
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gdt:
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.quad 0 //NULL
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//32-bit kernel code
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0x9A
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.byte 0xCF
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.byte 0x00
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//32-bit kernel code
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0x92
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.byte 0xCF
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.byte 00
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//32-bit user code
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0xFA
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.byte 0xCF
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.byte 0x00
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//32-bit user data
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0xF2
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.byte 0xCF
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.byte 00
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//64-bit kernel code
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0x9B
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.byte 0xAF
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.byte 0x00
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//64-bit kernel code
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0x93
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.byte 0xCF
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.byte 00
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//64-bit user code
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0xFB
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.byte 0xAF
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.byte 0x00
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//64-bit user data
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.word 0xFFFF
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.word 0x0000
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.byte 0x00
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.byte 0xF3
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.byte 0xCF
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.byte 00
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.section .bss
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.space 16384
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kernel_stack:
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