/files/asm/poweroff.S (d73421f545fc6d9b8e43bae9154a4158a0e32168) (1853 bytes) (mode 100644) (type blob)
/*
* This assembly source code is intended to be preprocessed:
* - don't use # comments
* - do use your C compiler front-end with proper specific options or do
* pipe cpp output to as (don't forget to link as an executable then)
*
* cpp poweroff.S | as -o poweroff.o; ld -o poweroff poweroff.o
*/
/*
* Magic values required to use _reboot() system call.
*/
#define LINUX_REBOOT_MAGIC1 0xfee1dead
#define LINUX_REBOOT_MAGIC2 672274793
#define LINUX_REBOOT_MAGIC2A 85072278
#define LINUX_REBOOT_MAGIC2B 369367448
#define LINUX_REBOOT_MAGIC2C 537993216
/*
* Commands accepted by the _reboot() system call.
*
* RESTART Restart system using default command and mode.
* HALT Stop OS and give system control to ROM monitor, if any.
* CAD_ON Ctrl-Alt-Del sequence causes RESTART command.
* CAD_OFF Ctrl-Alt-Del sequence sends SIGINT to init task.
* POWER_OFF Stop OS and remove all power from system, if possible.
* RESTART2 Restart system using given command string.
* SW_SUSPEND Suspend system using software suspend if compiled in.
* KEXEC Restart system using a previously loaded Linux kernel
*/
#define LINUX_REBOOT_CMD_RESTART 0x01234567
#define LINUX_REBOOT_CMD_HALT 0xCDEF0123
#define LINUX_REBOOT_CMD_CAD_ON 0x89ABCDEF
#define LINUX_REBOOT_CMD_CAD_OFF 0x00000000
#define LINUX_REBOOT_CMD_POWER_OFF 0x4321FEDC
#define LINUX_REBOOT_CMD_RESTART2 0xA1B2C3D4
#define LINUX_REBOOT_CMD_SW_SUSPEND 0xD000FCE2
#define LINUX_REBOOT_CMD_KEXEC 0x45584543
/* the syscall on x86_64 */
#define __ULINUX_NR_reboot 169
/* _start is the ELF symbol which defines the program entry point */
.global _start
_start:
mov $__ULINUX_NR_reboot, %eax
mov $LINUX_REBOOT_MAGIC1, %rdi
mov $LINUX_REBOOT_MAGIC2, %rsi
mov $LINUX_REBOOT_CMD_POWER_OFF, %rdx
xor %r10,%r10
/* never returning syscall */
syscall
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