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#define __ASSEMBLY__
#asm
#include "minix.v"
! Must match minix.c ...
#define LOADSEG (0x1000)
! Must match ELKS
#define ELKS_INITSEG (0x0100)
#define ELKS_SYSSEG (0x1000)
org minix_helper
push cs
pop ds
xor ax,ax
mov es,ax
mov ss,ax
mov sp,ax
mov cx,#$200 ! Move 512 words
mov si,ax ! Current load address.
mov di,#minix_helper ! To the correct address.
rep
movsw
mov ds,ax
jmpi code,0
msg_p2:
.asciz "\r\nLoading ELKS kernel\r\n"
msg_p3:
.asciz "Starting ...\r\n"
aint_elks:
.asciz "Not an ELKS image!"
elks_name:
.asciz "linux"
.byte 0,0,0,0,0,0,0,0,0
dispmsg: ! SI now has pointer to a message
lodsb
cmp al,#0
jz EOS
mov bx,#7
mov ah,#$E ! Can't use $13 cause that's AT+ only!
int $10
jmp dispmsg
EOS:
ret
code:
mov si,#msg_p2
call dispmsg
mov ax,minix_dinode ! In the same directory.
mov minix_inode,ax
mov cx,#14
mov si,#elks_name
mov di,#minix_bootfile
rep
movsb
call minix__loadprog
! Ok, now loaded "boot/linux" (or so)
mov si,#msg_p3
call dispmsg
call kill_motor ! For kernels without a floppy driver.
!
mov ax,#LOADSEG
mov ds,ax
mov ax,$1E6 ! Check for ELKS magic number
cmp ax,#$4C45
jnz not_elks
mov ax,$1E8
cmp ax,#$534B
jz boot_it
not_elks:
xor ax,ax
mov ds,ax
mov si,#aint_elks
call dispmsg
xor ax,ax
int $16
jmpi $0,$FFFF
boot_it:
mov ax,#ELKS_INITSEG
mov es,ax
mov bl,497 ! Fetch number of setup sects.
xor bh,bh
inc bx
mov ax,500 ! Fetch system size
mov cl,#5
add ax,#31
shr ax,cl
mov dx,ax
looping: ! Put the setup where it belongs
call copy_sect
dec bx
jnz looping
mov ax,#ELKS_SYSSEG
mov es,ax
looping2: ! Put the body code in the right place.
call copy_sect
dec dx
jnz looping2
! Ok, everything should be where it belongs call it.
mov ax,#ELKS_INITSEG
mov ds,ax
mov es,ax
mov ss,ax
mov sp,#0x4000-12
jmpi 0,ELKS_INITSEG+$20
copy_sect:
mov cx,#256
xor si,si
xor di,di
rep
movsw
mov ax,ds
add ax,#32
mov ds,ax
mov ax,es
add ax,#32
mov es,ax
ret
kill_motor:
push dx
mov dx,#0x3f2
xor al, al
outb
pop dx
ret
#endasm
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