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process.c

/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include "linux/init.h"
#include "linux/sched.h"
#include "as-layout.h"
#include "os.h"
#include "skas.h"

int new_mm(unsigned long stack)
{
      int fd;

      fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
      if (fd < 0)
            return fd;

      if (skas_needs_stub)
            map_stub_pages(fd, STUB_CODE, STUB_DATA, stack);

      return fd;
}

extern void start_kernel(void);

static int __init start_kernel_proc(void *unused)
{
      int pid;

      block_signals();
      pid = os_getpid();

      cpu_tasks[0].pid = pid;
      cpu_tasks[0].task = current;
#ifdef CONFIG_SMP
      cpu_online_map = cpumask_of_cpu(0);
#endif
      start_kernel();
      return 0;
}

extern int userspace_pid[];

extern char cpu0_irqstack[];

int __init start_uml(void)
{
      stack_protections((unsigned long) &cpu0_irqstack);
      set_sigstack(cpu0_irqstack, THREAD_SIZE);
      if (proc_mm)
            userspace_pid[0] = start_userspace(0);

      init_new_thread_signals();

      init_task.thread.request.u.thread.proc = start_kernel_proc;
      init_task.thread.request.u.thread.arg = NULL;
      return start_idle_thread(task_stack_page(&init_task),
                         &init_task.thread.switch_buf);
}

unsigned long current_stub_stack(void)
{
      if (current->mm == NULL)
            return 0;

      return current->mm->context.id.stack;
}

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