root/hwsetup.s

        .global HwSetup

        .text

        .code32

        .include "hwhelp.s"

HwSetup:
# set up interrupt controller
        mov $0b00010001, %al
        out %al, $0x20
        out %al, $0xa0
        mov $0x20, %al
        out %al, $0x21
        mov $0x28, %al
        out %al, $0xa1
        mov $0b00000100, %al
        out %al, $0x21
        mov $0b00000010, %al
        out %al, $0xa1
        mov $0x00000001, %al
        out %al, $0x21
        out %al, $0xa1
        mov $0b11111011, %al    # disable all interrupts
        out %al, $0x21
        mov $0b11111111, %al
        out %al, $0xa1

# set up keyboard controller
        call InBuffEmpty
        mov $0x0FA, %al
        out %al, $0x60
        call OutBuffFull
        in $0x60, %al
        call InBuffEmpty
        mov $0xF0, %al
        out %al, $0x60
        call OutBuffFull
        in $0x60, %al
        call InBuffEmpty
        mov $0x2, %al
        out %al, $0x60
        call OutBuffFull
        in $0x60, %al
        call InBuffEmpty
        mov $0x60, %al
        out %al, $0x64
        call InBuffEmpty
        mov $0x45, %al
        out %al, $0x60

# enable interrupts
#       mov $0b11111000, %al    # enable keyboard + timer interrupt
        mov $0b11111010, %al    # enable keyboard + timer interrupt
        out %al, $0x21

# reset ide controller
#       mov $0b00000100, %al
#       out %al, $0x3f6
# enable hd interrupt
        mov $0b10111111, %al
        out %al, $0xa1

# set up timer hardware for interrupts every 10ms
        mov $0x9C, %al
        out %al, $0x40
        mov $0x2e, %al
        out %al, $0x40

HD_PORT=0x1F0
# set up ide controller
.again1:
        in %dx, %al
        test $0x80, %al
        jnz .again1
        mov $HD_PORT+6, %dx
        mov $0, %al
        out %al, %dx
        mov $HD_PORT+7, %dx
        mov $0x10, %al
        out %al, %dx
        ret