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 <asm/tlbflush.h>
12
13 #include <as-layout.h>
14 #include <kern.h>
15 #include <os.h>
16 #include <skas.h>
17 #include <kern_util.h>
18
19 extern void start_kernel(void);
20
21 static int __init start_kernel_proc(void *unused)
22 {
23 block_signals_trace();
24
25 cpu_tasks[0].task = current;
26
27 start_kernel();
28 return 0;
29 }
30
31 extern int userspace_pid[];
32
33 extern char cpu0_irqstack[];
34
35 int __init start_uml(void)
36 {
37 stack_protections((unsigned long) &cpu0_irqstack);
38 set_sigstack(cpu0_irqstack, THREAD_SIZE);
39
40 init_new_thread_signals();
41
42 init_task.thread.request.u.thread.proc = start_kernel_proc;
43 init_task.thread.request.u.thread.arg = NULL;
44 return start_idle_thread(task_stack_page(&init_task),
45 &init_task.thread.switch_buf);
46 }
47
48 unsigned long current_stub_stack(void)
49 {
50 if (current->mm == NULL)
51 return 0;
52
53 return current->mm->context.id.stack;
54 }
55
56 struct mm_id *current_mm_id(void)
57 {
58 if (current->mm == NULL)
59 return NULL;
60
61 return ¤t->mm->context.id;
62 }
63
64 void current_mm_sync(void)
65 {
66 if (current->mm == NULL)
67 return;
68
69 um_tlb_sync(current->mm);
70 }
71
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