Embeded Linux Reboot

reboot command //kernel\sys.c Magic1, Magic2, two int type "magic numbers" for preventing misuse. Specifically in "include / uapi / Linux / reboot.h". cmd, reboot mode. //include\linux\reboot.h #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 arg, other additional parameters. SYSCALL_DEFINE4 (reboot, int, magic1, int, magic2, unsigned int, cmd, void __user *, arg) { ... switch (cmd) { case LINUX_REBOOT_CMD_RESTART: kernel_restart (NULL); Break; case LINUX_REBOOT_CMD_CAD_ON: C_A_D = 1; Break; case LINUX_REBOOT_CMD_CAD_OFF: C_A_D = 0; Break; case LINUX_REBOOT_CMD_HALT: kernel_halt (); do_exit (0); panic ( "can not halt"); case LINUX_REBOOT_CMD_POWER_OFF: kernel_power_off (); do_exit (0); Break; case LINUX_REBOOT_CMD_RESTART2: if (strncpy_from_user (& buffer [0], arg, sizeof (buffer) -. 1) .1881 0) { ret = -EFAULT; Break; } buffer [sizeof (buffer) - 1] = '\ 0'; kernel_restart (buffer); Break; #ifdef CONFIG_KEXEC case LINUX_REBOOT_CMD_KEXEC: ret = kernel_kexec (); Break; #ENDIF #ifdef CONFIG_HIBERNATION case LINUX_REBOOT_CMD_SW_SUSPEND: ret = hibernate (); Break; #ENDIF DEFAULT: ret = -EINVAL; Break; ... } //kernel\sys.c void kernel_restart (char * cmd) { ... machine_restart (cmd); } //arch\arm\kernel\process.c void machine_restart (char * cmd) { ... arm_pm_restart (reboot_mode, cmd); ... } //arch\arm\kernel\setup.c void __init setup_arch (char ** cmdline_p) { struct machine_desc * mdesc; ... mdesc = setup_machine_fdt (__atags_pointer); ... if (mdesc->restart) arm_pm_restart = mdesc->restart; ... } //arch\arm\mach-hi3516a\core.c MACHINE_START (HI3516A, "hi3516a") .atag_offset = 0x100, .map_io = hi3516a_map_io, .init_early = hi3516a_init_early, .init_irq = hi3516a_gic_init_irq, .handle_irq = gic_handle_irq, .TImer = & hi3516a_sys_TImer, .init_machine = hi3516a_init, .reserve = hi3516a_reserve, .restart = hi3516a_restart, MACHINE_END //arch\arm\mach-hi3516a\core.c void hi3516a_restart (char mode, const char * cmd) { __raw_writel (~ 0, IO_ADDRESS (SYS_CTRL_BASE) + REG_SC_SYSRES); } //drivers\mtd\devices\hisfc350\hisfc350_hi3516a.c #define SYS_CTRL_BASE (0x20050000) //arch\arm\mach-hi3535\include\mach\platform.h #define REG_SC_SYSRES 0x4, Read more

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