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kvm, test: add PIT 8254 and PIC 8259 test code

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8254 ticks at 100HZ.

Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Asias He
2010-06-08 20:46:50 +08:00
committed by Will Deacon
parent 4a7c140acb
commit 19059661aa
1 changed files with 79 additions and 0 deletions
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tests/kernel/tick.S
+79
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#define IO_PIC 0x20
#define IRQ_OFFSET 32
#define IO_PIT 0x40
#define TIMER_FREQ 1193182
#define TIMER_DIV(x) ((TIMER_FREQ+(x)/2)/(x))
.code16gcc
.text
.globl _start
.type _start, @function
_start:
mov $0x3f8,%dx
cs lea msg, %si
mov $(msg_end-msg), %cx
cs rep/outsb
set_idt:
xor %ax, %ax
movw %ax, %es
movw $timer_isr, %es:(IRQ_OFFSET*4)
movw %cs, %es:(IRQ_OFFSET*4+2)
set_pic:
# ICW1
mov $0x11, %al
mov $(IO_PIC), %dx
out %al,%dx
# ICW2
mov $(IRQ_OFFSET), %al
mov $(IO_PIC+1), %dx
out %al, %dx
# ICW3
mov $0x00, %al
mov $(IO_PIC+1), %dx
out %al, %dx
# ICW4
mov $0x3, %al
mov $(IO_PIC+1), %dx
out %al, %dx
set_pit:
# set 8254 mode
mov $(IO_PIT+3), %dx
mov $0x34, %al
outb %al, %dx
# set 8254 freq 100Hz
mov $(IO_PIT), %dx
movb $(TIMER_DIV(100) % 256), %al
outb %al, %dx
movb $(TIMER_DIV(100) / 256), %al
outb %al, %dx
enable_irq0:
mov $0xfe, %al
mov $(IO_PIC+1), %dx
out %al, %dx
sti
loop:
1:
jmp 1b
timer_isr:
pushaw
mov $0x3f8,%dx
mov $0x49, %al # I
out %al,%dx
mov $0x53, %al # S
out %al,%dx
mov $0x52, %al # R
out %al,%dx
mov $0x0a, %al # \n
out %al, %dx
popaw
iretw
msg:
.ascii "This is PVM.\nPIC 8259 and PIT 8254 test.\n"
.asciz "---------------------------------------------------\n"
msg_end: