arch/mips/loongson64/reset.c

Source file repositories/reference/linux-study-clean/arch/mips/loongson64/reset.c

File Facts

System
Linux kernel
Corpus path
arch/mips/loongson64/reset.c
Extension
.c
Size
4297 bytes
Lines
180
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

strlen(bootloader))) {
			/*
			 * convert command line string to array
			 * of parameters (as bootloader does).
			 */
			int offt;
			str = (char *)argv + KEXEC_ARGV_SIZE/2;
			memcpy(str, image->segment[i].buf, KEXEC_ARGV_SIZE/2);
			ptr = strchr(str, ' ');

			while (ptr && (argc < MAX_ARGS)) {
				*ptr = '\0';
				if (ptr[1] != ' ') {
					offt = (int)(ptr - str + 1);
					argv[argc] = KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2 + offt;
					argc++;
				}
				ptr = strchr(ptr + 1, ' ');
			}
			break;
		}
	}

	if (image->type == KEXEC_TYPE_DEFAULT)
		kexec_argc = argc;
	else
		kdump_argc = argc;

	/* kexec/kdump need a safe page to save reboot_code_buffer */
	image->control_code_page = virt_to_page((void *)KEXEC_CTRL_CODE);

	return 0;
}

static void loongson_kexec_shutdown(void)
{
#ifdef CONFIG_SMP
	int cpu;

	/* All CPUs go to reboot_code_buffer */
	for_each_possible_cpu(cpu)
		if (!cpu_online(cpu))
			cpu_device_up(get_cpu_device(cpu));

	secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
#endif
	kexec_args[0] = kexec_argc;
	kexec_args[1] = fw_arg1;
	kexec_args[2] = fw_arg2;
	memcpy((void *)fw_arg1, kexec_argv, KEXEC_ARGV_SIZE);
	memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
}

static void loongson_crash_shutdown(struct pt_regs *regs)
{
	default_machine_crash_shutdown(regs);
	kexec_args[0] = kdump_argc;
	kexec_args[1] = fw_arg1;
	kexec_args[2] = fw_arg2;
#ifdef CONFIG_SMP
	secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
#endif
	memcpy((void *)fw_arg1, kdump_argv, KEXEC_ARGV_SIZE);
	memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
}

#endif

static int __init mips_reboot_setup(void)
{
	if (loongson_sysconf.restart_addr) {
		register_sys_off_handler(SYS_OFF_MODE_RESTART,
				 SYS_OFF_PRIO_FIRMWARE,
				 firmware_restart, NULL);
	}

	if (loongson_sysconf.poweroff_addr) {
		register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
				 SYS_OFF_PRIO_FIRMWARE,
				 firmware_poweroff, NULL);
	}

#ifdef CONFIG_KEXEC_CORE
	kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
	if (WARN_ON(!kexec_argv))
		return -ENOMEM;

	kdump_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
	if (WARN_ON(!kdump_argv))
		return -ENOMEM;

Annotation

Implementation Notes