GNU Linux-libre 6.7.9-gnu
[releases.git] / arch / um / kernel / skas / process.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4  */
5
6 #include <linux/init.h>
7 #include <linux/sched/mm.h>
8 #include <linux/sched/task_stack.h>
9 #include <linux/sched/task.h>
10
11 #include <as-layout.h>
12 #include <kern.h>
13 #include <os.h>
14 #include <skas.h>
15
16 extern void start_kernel(void);
17
18 static int __init start_kernel_proc(void *unused)
19 {
20         int pid;
21
22         block_signals_trace();
23         pid = os_getpid();
24
25         cpu_tasks[0].pid = pid;
26         cpu_tasks[0].task = current;
27
28         start_kernel();
29         return 0;
30 }
31
32 extern int userspace_pid[];
33
34 extern char cpu0_irqstack[];
35
36 int __init start_uml(void)
37 {
38         stack_protections((unsigned long) &cpu0_irqstack);
39         set_sigstack(cpu0_irqstack, THREAD_SIZE);
40
41         init_new_thread_signals();
42
43         init_task.thread.request.u.thread.proc = start_kernel_proc;
44         init_task.thread.request.u.thread.arg = NULL;
45         return start_idle_thread(task_stack_page(&init_task),
46                                  &init_task.thread.switch_buf);
47 }
48
49 unsigned long current_stub_stack(void)
50 {
51         if (current->mm == NULL)
52                 return 0;
53
54         return current->mm->context.id.stack;
55 }