git.oblomov.eu Git - linux-2.6/blob - arch/um/kernel/skas/process.c

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/sched.h"
   7 #include "linux/slab.h"
   8 #include "linux/ptrace.h"
   9 #include "linux/proc_fs.h"
  10 #include "linux/file.h"
  11 #include "linux/errno.h"
  12 #include "linux/init.h"
  13 #include "asm/uaccess.h"
  14 #include "asm/atomic.h"
  15 #include "kern_util.h"
  16 #include "as-layout.h"
  17 #include "skas.h"
  18 #include "os.h"
  19 #include "tlb.h"
  20 #include "kern.h"
  21 #include "registers.h"
  22
  23 extern void schedule_tail(struct task_struct *prev);
  24
  25 int new_mm(unsigned long stack)
  26 {
  27         int fd;
  28
  29         fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
  30         if(fd < 0)
  31                 return fd;
  32
  33         if(skas_needs_stub)
  34                 map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack);
  35
  36         return fd;
  37 }
  38
  39 extern void start_kernel(void);
  40
  41 static int __init start_kernel_proc(void *unused)
  42 {
  43         int pid;
  44
  45         block_signals();
  46         pid = os_getpid();
  47
  48         cpu_tasks[0].pid = pid;
  49         cpu_tasks[0].task = current;
  50 #ifdef CONFIG_SMP
  51         cpu_online_map = cpumask_of_cpu(0);
  52 #endif
  53         start_kernel();
  54         return 0;
  55 }
  56
  57 extern int userspace_pid[];
  58
  59 extern char cpu0_irqstack[];
  60
  61 int __init start_uml(void)
  62 {
  63         stack_protections((unsigned long) &cpu0_irqstack);
  64         set_sigstack(cpu0_irqstack, THREAD_SIZE);
  65         if(proc_mm)
  66                 userspace_pid[0] = start_userspace(0);
  67
  68         init_new_thread_signals();
  69
  70         init_task.thread.request.u.thread.proc = start_kernel_proc;
  71         init_task.thread.request.u.thread.arg = NULL;
  72         return start_idle_thread(task_stack_page(&init_task),
  73                                  &init_task.thread.switch_buf);
  74 }
  75
  76 unsigned long current_stub_stack(void)
  77 {
  78         if(current->mm == NULL)
  79                 return 0;
  80
  81         return current->mm->context.skas.id.stack;
  82 }