249 lines
4.3 KiB
NASM
249 lines
4.3 KiB
NASM
org 0100h
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jmp BEGIN
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%include "pm.inc"
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;GDT
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DESC_VOID: Descriptor 0,0,0
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DESC_GRAPH: Descriptor 0b8000h,0ffffh,DA_DRW | DA_DPL3
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DESC_FLAT_C: Descriptor 0,0fffffh,DA_CR | DA_32 | DA_LIMIT_4K
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DESC_FLAT_RW: Descriptor 0,0fffffh,DA_DRW | DA_32 | DA_LIMIT_4K
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DESC_FLAT_USER_C: Descriptor 0,0fffffh,DA_CR | DA_32| DA_LIMIT_4K | DA_DPL3
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DESC_FLAT_USER_RW: Descriptor 0,0fffffh,DA_DRW | DA_32 | DA_LIMIT_4K | DA_DPL3
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GDTLEN equ $ - DESC_VOID
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GDTPTR: dw GDTLEN - 1
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dd LOADERINFLAT + DESC_VOID
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;Paging
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PDEBASE equ 100000h
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PTEBASE equ 101000h
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;kernel
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LOADERBASE equ 09000h
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LOADEROFFSET equ 0100h
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LOADERINFLAT equ LOADERBASE*10h
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KERNELFILENAME db 'KERNEL BIN',0
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KERNELBASE equ 03000h
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KERNELOFFSET equ 0000h
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KERNELINFLAT equ KERNELBASE*10h + KERNELOFFSET
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;Selectors
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SLCT_FLAT_C equ DESC_FLAT_C - DESC_VOID
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SLCT_GRAPH equ DESC_GRAPH - DESC_VOID
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SLCT_FLAT_RW equ DESC_FLAT_RW - DESC_VOID
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;==================Section .DATA==============================
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;Variables
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;Operating System Information
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;OS:
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OSINFO1: db 'Hyper-Assembler Operating System 1.0',0
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OSINFO2: db "Loader written by Orange'S, Kernel written by Hyper-Assembler",0
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KERNELFILELOADCOMPLETE db 'Kernel.bin Loaded to 0x30000',0
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;GETMEMORY
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RAMINFO1: db "Memory Information:",0
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RAMTABLE16: db ' BASE L BASE H Length L Length H Type ',0
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RAMSIZE: db 'RAM SIZE:',0
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GETMEMFAIL: db 'Failed to Get The Memory',0
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RAMAVAILABLE: db ' - Available',0
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RAMRESERVED: db ' - Reserved',0
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;Protected Mode:
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PMINFO: db 'Protected Mode Entered...',0
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PMINFO32 equ PMINFO + LOADERINFLAT
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;PAGING:
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PGINFO: db 'Paging Started...',0
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PGINFO32 equ PGINFO + LOADERINFLAT
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PTEINFO: db 'PTE Table BASE: ',0
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PTEINFO32 equ PTEINFO + LOADERINFLAT
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PDEINFO: db 'PDE Table BASE: ',0
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PDEINFO32 equ PDEINFO + LOADERINFLAT
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CR3INFO: db 'cr3: ',0
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CR3INFO32 equ CR3INFO + LOADERINFLAT
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;Variables Used in Functions
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IO16_SPACE: db ' ',0
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IO32_SPACE equ IO16_SPACE + LOADERINFLAT
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IO16_RETURN: db 0Ah,0
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IO32_RETURN equ IO16_RETURN + LOADERINFLAT
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GRAPHPOS: dd 0
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GRAPHPOS_32 equ GRAPHPOS + LOADERINFLAT
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GETMEMBUFF: times 1024 db 0
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GETMEMNUM: dd 0
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GETMEMNUM_32 equ GETMEMBUFF + LOADERINFLAT
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DISPMEMTOTAL: dd 0
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DISPMEMTOTAL_32 equ DISPMEMTOTAL + LOADERINFLAT
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KERNELLOADED: db 'KERNEL LOADED IN MEM.',0
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KERNELLOADED_32 equ KERNELLOADED + LOADERINFLAT
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%include "FAT12Header.inc"
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;=========================STACK32=============================
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[bits 32]
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STACK32BASE:
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times 1024 db 0
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TOP:
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STACK32TOP equ LOADERINFLAT + TOP
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;==========================CODE16==============================
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[bits 16]
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%include "io16.lib"
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%include "fat12readfile.lib"
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BEGIN:
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mov ax,cs
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mov ds,ax
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mov ss,ax
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mov es,ax
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mov ax,0003h
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int 10h ;clear
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xor eax,eax
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mov eax,OSINFO1
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push eax
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call DISPSTR16
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add esp,4
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call DISPRETURN16
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xor eax,eax
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mov eax,OSINFO2
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push eax
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call DISPSTR16
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add esp,4
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call DISPRETURN16
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call DISPRETURN16
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xor eax,eax
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mov eax,RAMINFO1
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push eax
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call DISPSTR16
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add esp,4
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call DISPRETURN16
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call GETMEM16
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mov eax,dword [ds:GETMEMNUM]
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cmp eax,0
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jne GETMEMSUCCESSFUL
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xor eax,eax
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mov eax,GETMEMFAIL
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push eax
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call DISPSTR16
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pop eax
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GETMEMSUCCESSFUL:
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call DISPMEM16
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call DISPRETURN16
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;FAT12ReadFile(ULONG16 Base,ULONG16 Offset,ULONG16 OffsetFileName)
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push KERNELFILENAME
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push KERNELOFFSET
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push KERNELBASE
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call FAT12ReadFile
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add esp,6
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xor eax,eax
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mov eax,KERNELFILELOADCOMPLETE
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push eax
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call DISPSTR16
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add esp,4
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call DISPRETURN16
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;load gdt
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lgdt [GDTPTR]
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;close interupt
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cli
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;open A20
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in al,92h
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or al,00000010b
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out 92h,al
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;prepare to switch to the protected mode
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mov eax,cr0
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or eax,1
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mov cr0,eax
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jmp dword SLCT_FLAT_C:(CODE32_START + LOADERINFLAT)
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;===================CODE32======================
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[bits 32]
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%include "mem32.lib"
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%include "io32.lib"
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CODE32_START:
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mov ax,SLCT_FLAT_RW
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mov ss,ax
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mov ds,ax
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mov es,ax
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mov gs,ax
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mov ax,SLCT_GRAPH
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mov gs,ax
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mov sp,STACK32TOP
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mov eax,PMINFO32
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push eax
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call near DISPSTR32
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pop eax
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;Setup paging
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call PAGINGINIT32
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call DISPRETURN32
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mov eax,PGINFO32
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push eax
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call near DISPSTR32
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pop eax
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call DISPRETURN32
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;Print PDE Table Base
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mov eax,PDEINFO32
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push eax
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call DISPSTR32
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pop eax
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mov eax,PDEBASE
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push eax
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call DISPINTEAX32
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pop eax
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call DISPRETURN32
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;Print PTE table base
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mov eax,PTEINFO32
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push eax
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call DISPSTR32
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pop eax
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mov eax,PTEBASE
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push eax
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call DISPINTEAX32
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pop eax
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call DISPRETURN32
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;Print cr3
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mov eax,CR3INFO32
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push eax
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call DISPSTR32
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pop eax
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mov eax,cr3
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push eax
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call DISPINTEAX32
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pop eax
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;Jump to The Kernel
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jmp SLCT_FLAT_C:KERNELINFLAT
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