LXR linux/arch/um/kernel/skas/process.c

   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 <as-layout.h>
  12#include <kern.h>
  13#include <os.h>
  14#include <skas.h>
  15
  16extern void start_kernel(void);
  17
  18static int __init start_kernel_proc(void *unused)
  19{
  20        int pid;
  21
  22        block_signals_trace();
  23        pid = os_getpid();
  24
  25        cpu_tasks[0].pid = pid;
  26        cpu_tasks[0].task = current;
  27
  28        start_kernel();
  29        return 0;
  30}
  31
  32extern int userspace_pid[];
  33
  34extern char cpu0_irqstack[];
  35
  36int __init start_uml(void)
  37{
  38        stack_protections((unsigned long) &cpu0_irqstack);
  39        set_sigstack(cpu0_irqstack, THREAD_SIZE);
  40
  41        init_new_thread_signals();
  42
  43        init_task.thread.request.u.thread.proc = start_kernel_proc;
  44        init_task.thread.request.u.thread.arg = NULL;
  45        return start_idle_thread(task_stack_page(&init_task),
  46                                 &init_task.thread.switch_buf);
  47}
  48
  49unsigned long current_stub_stack(void)
  50{
  51        if (current->mm == NULL)
  52                return 0;
  53
  54        return current->mm->context.id.stack;
  55}
  56