asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void * arg){ char buffer[256]; /* We only trust the superuser with rebooting the system. */ if (!capable(CAP_SYS_BOOT)) return -EPERM; /* For safety, we require "magic" arguments. */ if (magic1 != LINUX_REBOOT_MAGIC1 || (magic2 != LINUX_REBOOT_MAGIC2 && magic2 != LINUX_REBOOT_MAGIC2A && magic2 != LINUX_REBOOT_MAGIC2B)) return -EINVAL; lock_kernel(); switch (cmd) { case LINUX_REBOOT_CMD_RESTART: notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL); printk(KERN_EMERG "Restarting system.\n"); machine_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: notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL); printk(KERN_EMERG "System halted.\n"); machine_halt(); do_exit(0); break; case LINUX_REBOOT_CMD_POWER_OFF: notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL); printk(KERN_EMERG "Power down.\n"); machine_power_off(); do_exit(0); break; case LINUX_REBOOT_CMD_RESTART2: if (strncpy_from_user(&buffer[0], (char *)arg, sizeof(buffer) - 1) < 0) { unlock_kernel(); return -EFAULT; } buffer[sizeof(buffer) - 1] = '\0'; notifier_call_chain(&reboot_notifier_list, SYS_RESTART, buffer); printk(KERN_EMERG "Restarting system with command '%s'.\n", buffer); machine_restart(buffer); break; default: unlock_kernel(); return -EINVAL; } unlock_kernel(); return 0;}
Hwsleep.c
/****************************************************************************** * * FUNCTION: Acpi_enter_sleep_state * * PARAMETERS: Sleep_state - Which sleep state to enter * * RETURN: Status * * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231) * ******************************************************************************/ACPI_STATUSacpi_enter_sleep_state (u8 sleep_state){ACPI_STATUS status;ACPI_OBJECT_LIST arg_list;ACPI_OBJECT arg;u8 type_a;u8 type_b;u16 PM1_acontrol;u16 PM1_bcontrol;/* * _PSW methods could be run here to enable wake-on keyboard, LAN, etc. */status = acpi_hw_obtain_sleep_type_register_data (sleep_state, &type_a, &type_b);if (!ACPI_SUCCESS (status)) {return status;}/* run the _PTS and _GTS methods */MEMSET(&arg_list, 0, sizeof(arg_list));arg_list.count = 1;arg_list.pointer = &arg;MEMSET(&arg, 0, sizeof(arg));arg.type = ACPI_TYPE_INTEGER;arg.integer.value = sleep_state;acpi_evaluate_object(NULL, "\\_PTS", &arg_list, NULL);acpi_evaluate_object(NULL, "\\_GTS", &arg_list, NULL);/* clear wake status */acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_LOCK, WAK_STS, 1);disable();PM1_acontrol = (u16) acpi_hw_register_read(ACPI_MTX_LOCK, PM1_CONTROL);/* mask off SLP_EN and SLP_TYP fields */PM1_acontrol &= 0xC3FF;PM1_bcontrol = PM1_acontrol;/* mask in SLP_TYP */PM1_acontrol |= (type_a << acpi_hw_get_bit_shift (SLP_TYPE_X_MASK));PM1_bcontrol |= (type_b << acpi_hw_get_bit_shift (SLP_TYPE_X_MASK));/* write #1: fill in SLP_TYPE data */acpi_hw_register_write(ACPI_MTX_LOCK, PM1_a_CONTROL, PM1_acontrol);acpi_hw_register_write(ACPI_MTX_LOCK, PM1_b_CONTROL, PM1_bcontrol);/* mask in SLP_EN */PM1_acontrol |= (1 << acpi_hw_get_bit_shift (SLP_EN_MASK));PM1_bcontrol |= (1 << acpi_hw_get_bit_shift (SLP_EN_MASK));/* write #2: the whole tamale */acpi_hw_register_write(ACPI_MTX_LOCK, PM1_a_CONTROL, PM1_acontrol);acpi_hw_register_write(ACPI_MTX_LOCK, PM1_b_CONTROL, PM1_bcontrol);enable();return (AE_OK);}
