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|
#if 0
; disk.S -- inquire of BIOS and display disk parameters
;
Copyright 1999-2001 John Coffman.
All rights reserved.
Licensed under the terms contained in the file 'COPYING' in the
source directory.
#endif
#define DEBUG 0
#define DELL_DIRTY_HACK
SYSSEG = 0x1000 ; DEF_SYSSEG
SETUPSEG = 0x9020 ; DEF_SETUPSEG
.text
#if 1
.globl _main
_main:
#endif
.globl zero
zero:
; we want this to look like a bootable kernel image
; so we include the following header
;
jmp begin
.ascii "HdrS" ; Signature for Setup header
.word 0x0201 ; header format version number
.word 0,0 ; realmode switch, SETUPSEG
.word SYSSEG ; SYSSEG -- load at 1000:0000
.word id_string
.byte 0 ; type of loader
.byte 0 ; flags 0=load low
.word 0x200 ; move size
dd 0x1000 ; load us here
dd 0 ; ramdisk image
.word bs_helper,SETUPSEG ; kludge???
.word modelist+1024 ; heap end pointer
;----------end of header------------
begin:
mov ax,cs
cli ;make purists happy
mov ss,ax
mov sp,#0x7FFE
sti ; ***
call start ;do not separate from the instruction below
start: pop bx ;this MUST immediately follow the 'call'
sub bx,#start-zero
lea dx,zero
sub bx,dx ;BX=100h under DOS, BX=0h under BIOS
mov cl,#4
sar bx,cl
add ax,bx
mov ds,ax
cld
#ifdef DELL_DIRTY_HACK
mov ah,#15 ; get video mode
int 0x10
cbw
int 0x10 ; set video mode
#endif
call say
.ascii "\n>>>> Disk Detection and Parameter Display <<<<\n"
.ascii "Version 1.5.4, Copyright (C) 1999-2001 John Coffman.\n"
.ascii "Re-use and redistribution rights set forth"
.ascii " in the file \"COPYING\".\n\n"
.byte 0
cmp magic,#0xAA55
je sane ;check that we got the DS set right
call say
.ascii "\n\nCS/DS sanity check failed.\n"
.byte 0
hlti: hlt
jmp hlti
;;; nop ;spacer
magic: .word 0xAA55
sane:
#if 0
xor ax,ax
mov dl,al
int 0x13
mov ah,#8
int 0x13
#endif
smsw ax
test al,#1
jnz v86mode
br realmode
v86mode:
call say
.ascii "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n"
.ascii "!!! *** Warning: DOS is not running in REAL mode *** !!!\n"
.ascii "!!! *** Reported results may not be accurate *** !!!\n"
.ascii "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n"
.byte 0
call pause
realmode:
call say
.ascii "There "
.byte 0
int 0x11 ; get equipment configuration
test al,#1
mov ah,#-1
jz noflop
shl ax,1
shl ax,1
and ah,#3
jz flop1
noflop: call say
.ascii "are "
.byte 0
jmp flop2
flop1: call say
.ascii "is "
.byte 0
flop2: inc ah
mov nflop,ah
mov al,ah
add al,#0x30
call putc
call say
.ascii " floppy drive"
.byte 0
mov al,#'s
dec ah
jz flop3
call putc
flop3: inc ah
call say
.ascii " with BIOS support.\n"
.byte 0
; now probe for floppy drives
mov dl,#-1
fprobe: mov ah,#8
inc dl
push dx
xor cx,cx
int 0x13
pop dx
jc fstop
or cx,cx
jnz fprobe
fstop:
mov ah,nflop
cmp ah,dl
je fdisplay
call say
.ascii "But probing has found "
.byte 0
mov al,dl
add al,#'0
call putc
call say
.ascii "!!!\n"
.byte 0
cmp ah,dl
jae fdisplay
xchg ah,dl
fdisplay:
mov dl,#0 ;start with drive 0x00
xor cx,cx
mov cl,ah
jcxz floppy1
floppy: call drive
inc dl
loop floppy
floppy1:
mov al,#10
call putc
call say
.ascii "There is "
.byte 0
int 0x12 ;get amount of low memory
;;; mov ax,#640 ;debug
xor dx,dx
call print
call say
.ascii "K of low memory"
.byte 0
mov bx,#640
sub bx,ax
jnz ebda1
call say
.ascii " with no EBDA."
.byte 0
br ebda2
ebda1: push ax
mov ax,bx
xor bx,bx
call say
.ascii ". EBDA size = "
.byte 0
call dec3
call say
.ascii "K EBDA starts at 0x"
.byte 0
pop ax
mov cl,#6
shl ax,cl
call wout
call say
.ascii "0"
.byte 0
ebda2:
call say
.ascii "\n"
.byte 0
; post-floppy pause
call pause
mov ah,#0
mov dl,#0x80
int 0x13
mov ah,#8
int 0x13
mov ah,#0
jc nohard
mov ah,dl
nohard: mov nhard,ah
call say
.ascii "There "
.byte 0
dec ah
jz hard1
call say
.ascii "are "
.byte 0
jmp hard2
hard1: call say
.ascii "is "
.byte 0
hard2: inc ah
mov al,ah
add al,#'0
call putc
call say
.ascii " hard drive"
.byte 0
mov al,#'s
dec ah
jz hard3
call putc
hard3: inc ah
call say
.ascii " with BIOS support.\n"
.byte 0
; probe for hard drives
mov dl,#0x80-1
hprobe: mov ah,#8
inc dl
push dx
xor cx,cx
int 0x13
pop dx
jc hstop
or cx,cx
jnz hprobe
hstop:
and dl,#0x7f
mov ah,nhard
cmp ah,dl
je hdisplay
call say
.ascii "But probing has found "
.byte 0
mov al,dl
add al,#'0
call putc
call say
.ascii "!!!\n"
.byte 0
cmp ah,dl
jae hdisplay
xchg ah,dl
hdisplay:
mov dl,#0x80 ;start with drive 0x80
xor cx,cx
mov cl,ah
jcxz hdd1
hard: call drive
inc dl
loop hard
hdd1:
test byte ptr bigflag,#0xFF
jz hdd2
br big
hdd2: test byte ptr bigcyl,#0xFF
jz hdd3
br big2
hdd3:
call say
.ascii "\nEither your BIOS does not support EDD"
.ascii " packet calls, or you have no large\n"
.ascii "disks. You do not need to use LILO with"
.ascii " the 'lba32' global option (or '-L'\n"
.ascii "switch).\n"
.byte 0
br exit
big:
call say
.ascii "\nYou have "
.byte 0
cmp byte bigflag,#1
je noS
call say
.ascii "disks"
.byte 0
jmp goOn
noS: call say
.ascii "a disk"
.byte 0
goOn: call say
.ascii " bigger than 8.4Gb"
.byte 0
big1c: call say
.ascii " with Enhanced BIOS support.\n"
.ascii "Using LILO with the 'lba32' global option"
.ascii " (or '-L' switch) is recommended.\n"
.byte 0
br exit
big2:
call say
.ascii "\nYou have "
.byte 0
cmp byte bigcyl,#1
je big2a
call say
.ascii "disks"
.byte 0
jmp big2b
big2a: call say
.ascii "a disk"
.byte 0
big2b: call say
.ascii " with more than 1023 cylinders"
.byte 0
br big1c
nflop: .byte 0
nhard: .byte 0
bigflag: .byte 0
bigcyl: db 0
nlimit: dd 1024*255*63, 0
; inquire whether EDD drive BIOS calls are valid
; Carry clear says NO, Carry set says YES, CX=device bits &
; SI = pointer to dparam table
inqedd: push ax
push bx
push dx
push si
mov ah,#0x41
mov bx,#0x55aa
int 0x13
jc edd7
cmp bx,#0xaa55
jne edd7
test cl,#7
stc
jz edd8
lea si,dparam
mov word (si),#dlth
;;; nop ;spacer
;;; nop ;spacer
mov dh,ah ;save version number
mov ah,#0x48 ;get drive parameters
int 0x13
jc edd7
stc
pop ax ;discard saved SI
mov (si+1),dh ;save version info
jmp edd9 ;return SI, too
edd7: xor cx,cx ;carry is clear
edd8: pop si
edd9: pop dx
pop bx
pop ax
ret
; pause for the user to look at the screen
pause: call say
.ascii "Hit any key to continue..."
.byte 0
mov ah,#0
int 0x16
call say
.ascii "\r \n"
.byte 0
ret
; print out the IBM BIOS drive parameters for the drive in DL
drive: push bp
push ax
push bx
push cx
push es
push di
push si
push dx
call say
.ascii "Drive 0x"
.byte 0
mov al,dl
call bout
call say
.ascii " Cyl:Head:Sec = "
.byte 0
mov ah,#8
int 0x13
#if DEBUG
mov cx,#0xFAFF
mov dh,#0xFF ; 0xFE is the max.
#endif
push cx
push dx
rol cl,1
mov di,#1000
rol cl,1
xor bh,bh
and cl,#3
xchg ch,cl
inc cx
mov ax,cx
xor dx,dx
div di
mov bp,cx
or ax,ax
jz cyl2
call say
.ascii "1"
.byte 0
mov bh,#0x80
cyl2: xchg ax,dx
call dec3
call punct
pop dx
xor ax,ax
mov al,dh
xor bh,bh
inc ax
call dec3
mov dx,ax
call punct
;;; pop cx
;;; and cl,#0x3F
;;; mov al,cl
pop ax
and ax,#0x3F
call dec3
call say
.ascii " ("
.byte 0
;;; mul dl
mul dx
mul bp
push ds
pop es
lea di,ac0
push di
stosw
mov ax,dx
stosw
xor ax,ax
stosw
stosw
pop si
call dprint
call say
.ascii " sectors) --> "
.byte 0
call sizeit
call say
.byte 10,0
pop dx
push dx
call inqedd
jc xdd1
br xdd4
xdd1:
call say
.ascii " EDD rev "
.byte 0
mov al,(si+1)
mov cl,#4
mov ah,al
shr al,cl
add al,#'0
call putc
mov al,#'.
call putc
mov al,ah
and al,#0x0F
add al,#'0
call putc
call say
.ascii " geometry = "
.byte 0
test byte (si+2),#2
jz xdd2
mov ax,(si+4)
mov dx,(si+6)
or dx,dx
jnz xdd1a
cmp ax,#1024
jb xdd1b
xdd1a: inc byte (bigcyl)
xdd1b:
call print
call punct
mov ax,(si+8)
mov dx,(si+10)
call print
call punct
mov ax,(si+12)
mov dx,(si+14)
call print
call say
.ascii " "
.byte 0
xdd2:
call say
.ascii "("
.byte 0
lea si,(si+16)
call dprint
call say
.ascii " sectors) --> "
.byte 0
mov ax,(si+6)
cmp ax,nlimit+6
jb xdd3
ja xdd2a
mov ax,(si+4)
cmp ax,nlimit+4
jb xdd3
ja xdd2a
mov ax,(si+2)
cmp ax,nlimit+2
jb xdd3
ja xdd2a
mov ax,(si)
cmp ax,nlimit
jb xdd3
xdd2a: inc byte bigflag
xdd3:
mov dl,#1
call sizeit
call say
.byte 10,0
xdd4:
pop dx
pop si
pop di
pop es
pop cx
pop bx
pop ax
pop bp
ret
punct: mov al,#':
call putc
ret
chars: .ascii " KMGTxyz"
sizeit:
push ax
push bx
push cx
push dx
push si
push es
push di
lea bx,chars-1
mov di,si
push ds
pop es
mov ax,#512
or dx,dx
jz dpr5 ;handle small disks
call intmul
jmp dpr6
dpr5: mov ax,#2
call intdiv
inc bx
dpr6: mov ax,#1000
lea di,ac1
dpr7: lea bx,(bx+1)
mov cx,dx
call intdiv
xchg si,di
jnz dpr7
mov si,bx
mov ax,dx
xor bx,bx
call dec3
cmp byte ptr (si),#'K
je dpr8
mov al,#'.
call putc
mov ax,cx
#if 1
mov bx,#0x800a
add ax,#5
div bl
xor ah,ah
div bl
add al,#'0
call putc
xchg al,ah
#else
mov bx,#0x8000+100
add ax,#50
div bl
#endif
add al,#'0
call putc
dpr8: mov al,(si)
call putc
pop di
pop es
pop si
pop dx
pop cx
pop bx
pop ax
ret
; print the decimal double word number in DX:AX
;
print: push ds
push si
xor si,si
push si
push si
push dx
push ax
push ss
pop ds
mov si,sp
call dprint
lea sp,(si+8)
pop si
pop ds
ret
; print the decimal quad-word number in [DS:SI]
;
dprint: push ax
push bx
push dx
push es
push di
push ds
push si
sub sp,#8
mov di,sp
push ss
pop es
xor bx,bx
mov ax,#1000
dpr1: inc bx
call intdiv
mov si,di
push es
pop ds
push dx
jnz dpr1
jmp dpr3
dpr2: mov al,#',
call putc
dpr3: pop ax
call dec3
mov bh,#0x80
dec bl
jnz dpr2
lea sp,(di+8)
pop si
pop ds
pop di
pop es
pop dx
pop bx
pop ax
ret
; multiply the number in the ac pointed at by [DS:SI] by the AX, putting
; the result in the ac pointed to by [ES:SI]. Return overflow in AX.
; SI and DI may be the same
intmul:
push bp
push si
push di
push bx
push cx
push dx
mov cx,#4
mov bp,ax
xor dx,dx
im4: mov bx,dx
lodsw
mul bp
add ax,bx
adc dx,#0
;;; nop ;spacer
stosw
loop im4
mov ax,dx
pop dx
pop cx
pop bx
pop di
pop si
pop bp
ret
; divide the ac pointed at by [DS:SI] by the AX, producing a result
; in [ES:DI], and a remainder in DX; the Z flag reflects the quotient
; DI may equal SI for in-place division
intdiv: push bx
push cx
push bp
push di
push si
mov cx,#4
mov bx,cx
dec bx
add bx,bx
lea si,(si+bx)
lea di,(di+bx)
xor dx,dx
xor bp,bp
std
mov bx,ax
id2: lodsw
div bx
or bp,ax ;sets the Z flag
stosw
loop id2
cld
mov ax,bx
pop si
pop di
pop bp
pop cx
pop bx
ret
; write the number < 1000 in AX as 3 decimal digits
; BH flags whether leading zeroes are printed (0x80=yes, 0=no)
dec3: push bx
push ax
push cx
mov cx,#2
mov bl,#100
dec32: div bl
xor al,bh
jz dec36
xor al,bh
mov bh,#0x80
dec34: add al,#'0
call putc
mov bh,#0x80
dec36: mov al,ah
mov ah,#0
mov bl,#10
dec cx
jg dec32
jz dec34
pop cx
pop ax
pop bx
ret
; write the <nul> terminated string which follows the call
; no registers altered
say: push bp
mov bp,sp
push ds
push si
push ax
mov si,(bp+2)
push cs
pop ds
say1: lodsb
or al,al
jz say2
call putc
jmp say1
say2: mov (bp+2),si
pop ax
pop si
pop ds
pop bp
ret
; write the word in AX in hex
wout: xchg ah,al
call bout
xchg ah,al
call bout
ret
; write the byte in AL in hex
bout: push ax
push cx
push ax
mov cx,#0x204
shr al,cl
bout1: add al,#'0
cmp al,#'9
jbe bout2
add al,#'A-'0-10
bout2: call putc
dec ch
jz bout4
pop ax
and al,#0xF
jmp bout1
bout4: pop cx
pop ax
ret
; write the character in AL in teletype mode
; all registers are preserved
putc: push bx
push ax
mov ah,#14
xor bh,bh
cmp al,#10 ;test for new-line
jne putc2
mov al,#13 ;get <cr>
int 0x10
mov al,#10
putc2: int 0x10
pop ax
pop bx
ret
#define LILO_ASM
#include "lilo.h"
#include "read.S"
#include "bdata.h"
#define BD_VERBOSE
#include "biosdata.S"
exit: mov ax,cs
mov dx,ds
cmp ax,dx
jae bd_test
exit_dos: mov ax,#0x4c00
int 0x21
bd_test:
call pause
call say
.ascii "BIOS data collection test.\n"
.ascii "Failure of this test will require booting all Linux\n"
.ascii "kernels with the 'nobd' command-line option.\n"
.ascii "Hit <ESC> to bypass, any other key to continue..."
.byte 0
mov ah,#0
int 0x16
call say
.byte 10,10,0
cmp al,#0x1b ; <ESC>
je bd_test_skip
#if 1
mov ax,cs
mov bx,#SYSSEG
cmp ax,bx
jae collect
mov es,bx
mov di,#theend-1
std
lea cx,(di+1)
mov si,di
rep
movsb
mov ss,bx
mov ds,bx
cld
push es
push #collect
retf
collect:
#endif
call io_biosdata
call say
.ascii "\nALL OKAY\n\n"
.byte 0
bd_test_skip:
call say
.ascii "Remove the floppy disk from the drive.\n"
.ascii "Hit any key to reboot..."
.byte 0
mov ah,#0
int 0x16
call say
.byte 10,10,10,0
bs_helper: int 0x19 ;label here for kludge
id_string: .ascii "Disk.Com"
.byte 0
ac0: .word 0,0,0,0
ac1: .word 0,0,0,0
dparam: .word dlth
dflags: .word 0
dcyl: dd 0
dhead: dd 0
dsec: dd 0
dsecs: dd 0,0
ssize: .word 0
dptp: dd 0
dlthe:
dlth = dlthe-dparam
modelist:
theend:
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