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
19extern void start_kernel(void);
20
21static int __init start_kernel_proc(void *unused)
22{
23	block_signals_trace();
 
 
 
24
 
 
 
 
 
25	start_kernel();
26	return 0;
27}
28
29extern int userspace_pid[];
30
31static char cpu0_irqstack[THREAD_SIZE] __aligned(THREAD_SIZE);
32
33int __init start_uml(void)
34{
35	stack_protections((unsigned long) &cpu0_irqstack);
36	set_sigstack(cpu0_irqstack, THREAD_SIZE);
 
 
 
 
 
 
 
 
37
38	init_new_thread_signals();
39
40	init_task.thread.request.thread.proc = start_kernel_proc;
41	init_task.thread.request.thread.arg = NULL;
42	return start_idle_thread(task_stack_page(&init_task),
43				 &init_task.thread.switch_buf);
44}
45
46unsigned long current_stub_stack(void)
47{
48	if (current->mm == NULL)
49		return 0;
50
51	return current->mm->context.id.stack;
52}
53
54struct mm_id *current_mm_id(void)
55{
56	if (current->mm == NULL)
57		return NULL;
58
59	return &current->mm->context.id;
60}
61
62void current_mm_sync(void)
63{
64	if (current->mm == NULL)
65		return;
66
67	um_tlb_sync(current->mm);
68}

 
 1/*
 2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 3 * Licensed under the GPL
 4 */
 5
 6#include "linux/init.h"
 7#include "linux/sched.h"
 8#include "as-layout.h"
 9#include "kern.h"
10#include "os.h"
11#include "skas.h"
12
13int new_mm(unsigned long stack)
14{
15	int fd, err;
16
17	fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
18	if (fd < 0)
19		return fd;
20
21	if (skas_needs_stub) {
22		err = map_stub_pages(fd, STUB_CODE, STUB_DATA, stack);
23		if (err) {
24			os_close_file(fd);
25			return err;
26		}
27	}
28
29	return fd;
30}
31
32extern void start_kernel(void);
33
34static int __init start_kernel_proc(void *unused)
35{
36	int pid;
37
38	block_signals();
39	pid = os_getpid();
40
41	cpu_tasks[0].pid = pid;
42	cpu_tasks[0].task = current;
43#ifdef CONFIG_SMP
44	init_cpu_online(get_cpu_mask(0));
45#endif
46	start_kernel();
47	return 0;
48}
49
50extern int userspace_pid[];
51
52extern char cpu0_irqstack[];
53
54int __init start_uml(void)
55{
56	stack_protections((unsigned long) &cpu0_irqstack);
57	set_sigstack(cpu0_irqstack, THREAD_SIZE);
58	if (proc_mm) {
59		userspace_pid[0] = start_userspace(0);
60		if (userspace_pid[0] < 0) {
61			printf("start_uml - start_userspace returned %d\n",
62			       userspace_pid[0]);
63			exit(1);
64		}
65	}
66
67	init_new_thread_signals();
68
69	init_task.thread.request.u.thread.proc = start_kernel_proc;
70	init_task.thread.request.u.thread.arg = NULL;
71	return start_idle_thread(task_stack_page(&init_task),
72				 &init_task.thread.switch_buf);
73}
74
75unsigned long current_stub_stack(void)
76{
77	if (current->mm == NULL)
78		return 0;
79
80	return current->mm->context.id.stack;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
81}