BIOS Read Sector

Hi all,
I have a piece of assembly code that is the boot sector of the hard disk, and it loads the 2nd sector. But reading sector with the BIOS does not work. Please help.

See the code below:




.code16

.global _start


.text

_start:

    jmp LoadKernel


loop:
    jmp loop


StartKernel:
    # jmp to kernel
    mov $0x7e00, %ax
    jmp *%ax



LoadKernel:
    # BIOS Read Sector

    mov $0, %ax
    mov %ax, %es                     # data buffer
    mov $0x7e00, %bx            # data buffer

    mov $0x02, %ah
    mov 1, %al      # number of sector to read
    mov $0, %ch                    # cylinder number
    mov $2, %cl                     # sector number
    mov $0x0, %dh                     # head number
    mov $0x1, %dl                     # drive number


    int $0x13

    jmp StartKernel



.section .bootsig

.byte 0, 0
.byte 0x55, 0xaa

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