Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/sched/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/sched/task.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <as-layout.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <kern.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <os.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <skas.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) extern void start_kernel(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static int __init start_kernel_proc(void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	int pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	block_signals_trace();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	pid = os_getpid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	cpu_tasks[0].pid = pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	cpu_tasks[0].task = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	start_kernel();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) extern int userspace_pid[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) extern char cpu0_irqstack[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int __init start_uml(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	stack_protections((unsigned long) &cpu0_irqstack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	set_sigstack(cpu0_irqstack, THREAD_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	init_new_thread_signals();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	init_task.thread.request.u.thread.proc = start_kernel_proc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	init_task.thread.request.u.thread.arg = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	return start_idle_thread(task_stack_page(&init_task),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 				 &init_task.thread.switch_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) unsigned long current_stub_stack(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	if (current->mm == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	return current->mm->context.id.stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }