100 lines
1.9 KiB
ArmAsm
100 lines
1.9 KiB
ArmAsm
/* sections */
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#include <minix/config.h>
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#include <minix/const.h>
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#include <machine/asm.h>
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#include <machine/interrupt.h>
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#include "archconst.h"
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#include "kernel/const.h"
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#include "sconst.h"
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#include "multiboot.h"
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/*
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* This file contains a number of 16-bit assembly code utility routines needed by the
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* kernel.
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*/
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.text
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.code16
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/*===========================================================================*/
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/* poweroff16 */
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/*===========================================================================*/
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/* PUBLIC void poweroff16(); */
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/* Power down system */
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ENTRY(poweroff16)
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/* Assume eax is already set to required value of cr0*/
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.byte 0x0F,0x22,0xC0 /* mov %cr0,%eax */
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ljmp $0,$(BIOS_POWEROFF_ENTRY + real_mode - _C_LABEL(poweroff16))
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real_mode:
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mov $((BIOS_POWEROFF_ENTRY >> 4) + 0x200),%ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %ss
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mov $0x1000, %sp
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xorb %ah, %ah
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/* Close gate A20 */
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gate_A20:
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call kb_wait
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movb $0xD1,%al
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outb $0x64
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call kb_wait
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movb $0xDD,%al
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orb %ah,%al
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outb $0x60
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call kb_wait
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movb $0xFF,%al
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outb $0x64
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call kb_wait
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/* Connect to APM */
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mov $0x5301,%ax
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mov $0x0,%bx
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int $0x15
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jc apm_err
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/* Enable power management */
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mov $0x5308,%ax
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mov $0x1,%bx
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mov $0x1,%cx
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int $0x15
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jc apm_err
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/* Set power state to off */
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mov $0x5307,%ax
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mov $0x01,%bx
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mov $0x3,%cx
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int $0x15
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jc apm_err
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0: hlt
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jmp 0b
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poweroff_msg:
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.ascii "You can poweroff the machine safely now"
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poweroff_msg_end:
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#define POWEROFF_MSG_LEN (poweroff_msg_end-poweroff_msg)
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apm_err:
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/* If APM can't perform the shutdown, print something to inform */
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mov $0x02, %ax /* clear screen */
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int $0x10
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mov $(BIOS_POWEROFF_ENTRY >> 4), %ax
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mov %ax, %es
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mov $0x1301, %ax
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mov $0x07, %bx
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mov $POWEROFF_MSG_LEN, %cx
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mov $0x0300, %dx
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mov $(poweroff_msg - _C_LABEL(poweroff16)), %bp
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int $0x10
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0: hlt
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jmp 0b
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kb_wait:
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inb $0x64
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testb $0x02,%al
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jnz kb_wait
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ret
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/*mark the end for copy*/
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LABEL(poweroff16_end)
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