365 lines
6.9 KiB
NASM
365 lines
6.9 KiB
NASM
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; MenuesOS Boot Loader
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;
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; Author: Trans
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; Date: 14.02.03
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; Version: 1.0
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;
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; Current Version: 1.1
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; Date of modification: 11.06.03
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;
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; Compile with FASM
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;
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;--------Code------------
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org 100h
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start:
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push cs
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pop ds
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mov ax,0003h
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int 10h
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mov dx,title
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call print
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mov dx,mes1
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call print
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mov dx,img0
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call file_open
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test ax,ax
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jnz loader_continue
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mov dx,img2
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call file_open
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test ax,ax
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jne loader_continue
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mov dx,img3
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call file_open
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test ax,ax
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je loader_not_find_file
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loader_continue:
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mov [handle],ax
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;---------Read boot-sector-----------
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mov bx,ax
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mov dx,buffer
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mov cx,512
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call file_read
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;--------Read parametrs--------------
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mov ax,[buffer+0bh]
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mov [SectSize],ax
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mov al,[buffer+0dh]
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mov [ClustSect],al
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mov ax,[buffer+0eh]
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mov [ResSect],ax
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add ax,[ResRgn]
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mov [FATRgn],ax
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mov al,[buffer+10h]
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mov [FATCnt],al
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xor bx,bx
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mov bl,al
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mov ax,[buffer+11h]
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mov [RootEnt],ax
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shr ax,4 ; ax=ax*32/512
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mov [RootDirRgnSz],ax
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mov ax,[buffer+16h]
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mov [FATSect],ax
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mul bx
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mov [FATRgnSz],ax
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add ax,[FATRgn]
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mov [RootDirRgn],ax
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add ax,[RootDirRgnSz]
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mov [DataRgn],ax
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;------Read FATs and RootDir---------
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xor eax,eax
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xor edx,edx
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mov ax,[FATRgn]
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mul [SectSize]
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mov cx,dx
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mov dx,ax
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mov bx,[handle]
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call file_offset
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mov ax,[FATRgnSz]
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mul [SectSize]
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mov cx,ax
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mov dx,buffer
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mov bx,[handle]
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call file_read
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mov cx,[RootEnt]
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shl cx,5
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mov dx,Root
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mov bx,[handle]
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call file_read
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;-------Search entry pointer in RootDir---------
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push ds
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pop es
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mov cx,[RootEnt]
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mov bx,Root
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loader_loc_00:
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push cx
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mov cx,11
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mov di,bx
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mov si,kernel
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repe cmpsb
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jnz loader_notfound
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pop cx
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jmp loader_find
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loader_notfound:
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pop cx
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add bx,32
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loop loader_loc_00
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loader_find:
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mov ax,[bx+1ah]
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mov [FirstClust],ax
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mov eax,[bx+1ch]
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mov [filesize],eax
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;------Read Kernel----------------------
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call read_kernel
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;---------------------------------------
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mov bx,[handle]
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call file_close
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;;;;;;;;;;;;;;;;;;;;;;
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jmp loader_yes
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;;;;;;;;;;;;;;;;;;;;;;
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; mov dx,mes2
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; call print
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;loader_key:
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; mov ah,00h
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; int 16h
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; cmp al,1bh ;ESC
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; je loader_no
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; cmp al,6eh ;'n'
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; je loader_no
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; cmp al,4eh ;'N'
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; je loader_no
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; cmp al,79h ;'y'
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; je loader_yes
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; cmp al,59h ;'Y'
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; je loader_yes
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; jmp loader_key
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loader_not_find_file:
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mov dx,mes4
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call print
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jmp loader_exit
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loader_yes:
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mov dx,yes
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call print
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mov ax,7000h
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mov es,ax
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mov si,move_kernel
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xor di,di
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mov cx,len_mk
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rep movsb
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jmp far 7000h:0000h
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; jmp loader_exit
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loader_no:
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mov dx,no
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call print
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loader_exit:
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mov dx,mes3
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call print
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retn
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;----Subprogramms--------
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print:
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; in: dx - offset of ASCII string
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; out:
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mov ah,09h
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int 21h
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retn
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file_open:
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; in: ds:dx - offset of ASCIIZ filename string
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; out: ax - file handle (ax=0 - not found)
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mov ax,3d00h
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int 21h
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jnc fo_exit
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xor ax,ax
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fo_exit:
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retn
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file_close:
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; in: bx - file handle
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; out:
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mov ah,3eh
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int 21h
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retn
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file_read:
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; in: bx - file handle
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; ds:dx - buffer
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; cx - numbers of bytes
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; out:
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mov ah,3fh
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int 21h
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retn
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file_offset:
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; in: bx - file handle
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; cx:dx - offset in bytes (cx*65535+dx)
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; out:
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mov ax,4200h
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int 21h
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retn
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sector_find:
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; in: ax - No of Cluster
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; out: ax - 1st sector of Cluster
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dec ax
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dec ax
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push bx
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xor bx,bx
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mov bl,[ClustSect]
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mul bx
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pop bx
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add ax,[DataRgn]
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retn
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read_cluster:
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; in: ax - No of Cluster
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; ds:dx - buffer
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; out:
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push dx
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call sector_find
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push ax
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xor eax,eax
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xor ebx,ebx
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pop ax
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mov bx,[SectSize]
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mul ebx
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mov dx,ax
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shr eax,16
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mov cx,ax
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mov bx,[handle]
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call file_offset
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xor ax,ax
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mov al,[ClustSect]
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mul [SectSize]
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mov cx,ax
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mov bx,[handle]
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pop dx
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call file_read
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retn
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read_kernel:
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; in:
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; out:
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mov ax,8000h
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mov es,ax ;8000:0000 = 80000h - Temporal location of kernel
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xor di,di ;
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mov ax,[FirstClust]
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mov bp,ax
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rk_loc_00:
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push es
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mov dx,Root
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call read_cluster
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xor ax,ax ; Moving cluster to area of location kernel
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mov al,[ClustSect] ;
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mul [SectSize] ;
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mov cx,ax ;
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pop es ;
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mov si,Root ;
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rep movsb ;
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cmp di,00h
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jne rk_continue
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mov ax,es
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add ax,1000h
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mov es,ax
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rk_continue:
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mov ax,bp
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cmp ax,0ff8h
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jae rk_done
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shl ax,1 ; Val=Clustrer*1,5 //(Cluster*3)/2
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add ax,bp ;
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shr ax,1 ;
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mov bx,ax
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add bx,buffer
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mov ax,[bx]
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bt bp,0
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jc rk_nechet
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and ax,0fffh
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jmp rk_chet
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rk_nechet:
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shr ax,4
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rk_chet:
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mov bp,ax
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jmp rk_loc_00
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rk_done:
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retn
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move_kernel:
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; in:
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; out:
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mov ax,8000h
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mov ds,ax
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mov ax,1000h
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mov es,ax
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xor si,si
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xor di,di
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mov cx,8000h
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rep movsb
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mov cx,8000h
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rep movsb
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mov bx,es
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add bx,1000h
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mov es,bx
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mov bx,ds
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add bx,1000h
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mov ds,bx
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mov cx,8000h
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rep movsb
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mov cx,8000h
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rep movsb
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mov ax,1000h
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mov ds,ax
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mov es,ax
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jmp far 1000h:0000h
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retn
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len_mk=$-move_kernel
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;--------Data------------
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title db 'MenuetOS/KolibriOS Boot Loader. Ver.1.1 Copyright(C) 2003, Trans.',0ah,0dh,0ah,0dh,'$'
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mes1 db 'It is alternative of boot from floppy.',0ah,0dh
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db 'You MUST select HD booting !!!',0ah,0dh,0ah,0dh,'$'
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mes2 db 'Are you sure loading KolibriOS? (Y/N):','$'
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yes db 'Y','$'
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no db 'N','$'
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mes3 db 0ah,0dh,0ah,0dh,'See you later ...',0ah,0dh,'$'
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mes4 db 0ah,0dh,0ah,0dh,'Not Found: '
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img0 db 'kolibri\kolibri.img',0,', '
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img2 db 'kolibri.img',0,', '
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img3 db 'menuet.img',0,' :($'
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kernel db 'KERNEL MNT',0
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handle dw ?
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SectSize dw ? ; +0bh
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ClustSect db ? ; +0dh
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ResSect dw ? ; +0eh
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FATCnt db ? ; +10h
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RootEnt dw ? ; +11h
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FATSect dw ? ; +16h
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filesize dd ? ; +1ch
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FirstClust dw ? ; +1ah
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ResRgn dw 0 ; = VolumeStart
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FATRgn dw ? ; = ResRgn+ResSect
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RootDirRgn dw ? ; = FATRgn+(FATCnt*FATSect)
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DataRgn dw ? ; = RootDirRgn+((RootEnt*32)/SectSize)
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ResRgnSz dw ? ; = ResSect
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FATRgnSz dw ? ; = FATCnt*FATSect
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RootDirRgnSz dw ? ; = (RootEnt*32)/SectSize
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;First sector of cluster N = DataRgn+((N-2)*ClustSect)
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buffer:
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org 3000h
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Root:
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