9ce1c49421f88a7cf40cb6bcac3719add73b6e39
[linux-2.6.git] / arch / um / kernel / skas / process.c
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 "os.h"
10 #include "skas.h"
11
12 int new_mm(unsigned long stack)
13 {
14         int fd;
15
16         fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
17         if (fd < 0)
18                 return fd;
19
20         if (skas_needs_stub)
21                 map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack);
22
23         return fd;
24 }
25
26 extern void start_kernel(void);
27
28 static int __init start_kernel_proc(void *unused)
29 {
30         int pid;
31
32         block_signals();
33         pid = os_getpid();
34
35         cpu_tasks[0].pid = pid;
36         cpu_tasks[0].task = current;
37 #ifdef CONFIG_SMP
38         cpu_online_map = cpumask_of_cpu(0);
39 #endif
40         start_kernel();
41         return 0;
42 }
43
44 extern int userspace_pid[];
45
46 extern char cpu0_irqstack[];
47
48 int __init start_uml(void)
49 {
50         stack_protections((unsigned long) &cpu0_irqstack);
51         set_sigstack(cpu0_irqstack, THREAD_SIZE);
52         if (proc_mm)
53                 userspace_pid[0] = start_userspace(0);
54
55         init_new_thread_signals();
56
57         init_task.thread.request.u.thread.proc = start_kernel_proc;
58         init_task.thread.request.u.thread.arg = NULL;
59         return start_idle_thread(task_stack_page(&init_task),
60                                  &init_task.thread.switch_buf);
61 }
62
63 unsigned long current_stub_stack(void)
64 {
65         if (current->mm == NULL)
66                 return 0;
67
68         return current->mm->context.skas.id.stack;
69 }