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Special Forums Hardware Boot Loaders read sectors from disk failed with timeout Post 302552170 by wljackhero on Friday 2nd of September 2011 12:38:58 AM
Old 09-02-2011
read sectors from disk failed with timeout

i'm writing some code to simulate the boot progress after power on
but when i try to read the 2nd sector from a floppy disk, this operation always fail with ah=0x80h which means timeout, how can i get over this problem?
my code would be like this:
Code:
[jack@localhost 1]$ cat boot.S
.code16
#define SETUPLEN  4
#define BOOTSEG  0x7C0
#define INITSEG  0x900

.text
a:
mov $BOOTSEG, %ax
mov %ax, %ds
mov $INITSEG, %ax
mov %ax, %es
mov $256, %cx
sub %si, %si
sub %di, %di
rep
movsw

jmp 0x9000+go-a

go:
mov %cs, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %ss
mov $0xFF00, %sp

load_setup:
mov $0x0000, %dx
mov $0x0002, %cx
mov $0x0200, %bx
mov $0x0200+SETUPLEN, %ax
int $0x13                           //timeout happens here
jnc ok_load_setup
mov $0x0000,%dx
mov $0x0000,%ax
int $0x13
jmp load_setup

ok_load_setup:
mov $0x00, %dl
mov $0x0800, %ax
int $0x13
mov $0x00, %ch
mov %cx, %cs 
mov $INITSEG, %ax
mov %ax, %es

mov $0x03, %ah
xor %bh, %bh
int $0x10

mov $24, %cx
mov $0x0007, %bx
mov msg, %bp
mov $0x1301, %ax
int $0x10

msg:
.byte 13, 10


.org 510
.word 0xaa55

looking forward to replies.
really appreciate any suggestion.
 

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INTRO(3)						     Library Functions Manual							  INTRO(3)

NAME
intro - introduction to library functions SYNOPSIS
#include <stdio.h> #include <math.h> DESCRIPTION
This section describes functions that may be found in various libraries, other than those functions that directly invoke UNIX system primi- tives, which are described in section 2. Functions are divided into various libraries distinguished by the section number at the top of the page: (3) These functions, together with those of section 2 and those marked (3S), constitute library libc, which is automatically loaded by the C compiler cc(1) and the Fortran compiler f77(1). The link editor ld(1) searches this library under the `-lc' option. Declara- tions for some of these functions may be obtained from include files indicated on the appropriate pages. (3M) These functions constitute the math library, libm. They are automatically loaded as needed by the Fortran compiler f77(1). The link editor searches this library under the `-lm' option. Declarations for these functions may be obtained from the include file <math.h>. (3S) These functions constitute the `standard I/O package', see stdio(3). These functions are in the library libc already mentioned. Declarations for these functions may be obtained from the include file <stdio.h>. (3X) Various specialized libraries have not been given distinctive captions. The files in which these libraries are found are named on the appropriate pages. FILES
/lib/libc.a /lib/libm.a, /usr/lib/libm.a (one or the other) SEE ALSO
stdio(3), nm(1), ld(1), cc(1), f77(1), intro(2) DIAGNOSTICS
Functions in the math library (3M) may return conventional values when the function is undefined for the given arguments or when the value is not representable. In these cases the external variable errno (see intro(2)) is set to the value EDOM or ERANGE. The values of EDOM and ERANGE are defined in the include file <math.h>. ASSEMBLER
In assembly language these functions may be accessed by simulating the C calling sequence. For example, ecvt(3) might be called this way: setd mov $sign,-(sp) mov $decpt,-(sp) mov ndigit,-(sp) movf value,-(sp) jsr pc,_ecvt add $14.,sp INTRO(3)
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