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kvm, test: add PIT 8254 and PIC 8259 test code
8254 ticks at 100HZ. Signed-off-by: Asias He <[email protected]> Signed-off-by: Pekka Enberg <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 1,79 @@ | ||
| #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)) | ||
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| .code16gcc | ||
| .text | ||
| .globl _start | ||
| .type _start, @function | ||
| _start: | ||
| mov $0x3f8,%dx | ||
| cs lea msg, %si | ||
| mov $(msg_end-msg), %cx | ||
| cs rep/outsb | ||
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||
| set_idt: | ||
| xor %ax, %ax | ||
| movw %ax, %es | ||
| movw $timer_isr, %es:(IRQ_OFFSET*4) | ||
| movw %cs, %es:(IRQ_OFFSET*4 2) | ||
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| 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 | ||
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| 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 | ||
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| enable_irq0: | ||
| mov $0xfe, %al | ||
| mov $(IO_PIC 1), %dx | ||
| out %al, %dx | ||
| sti | ||
| loop: | ||
| 1: | ||
| jmp 1b | ||
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| 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 | ||
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| msg: | ||
| .ascii "This is PVM.\nPIC 8259 and PIT 8254 test.\n" | ||
| .asciz "---------------------------------------------------\n" | ||
| msg_end: |