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 #include <kern_util.h> 16 17 extern void start_kernel(void); 18 19 static int __init start_kernel_proc(void *unused) 20 { 21 block_signals_trace(); 22 23 cpu_tasks[0].task = current; 24 25 start_kernel(); 26 return 0; 27 } 28 29 extern int userspace_pid[]; 30 31 extern char cpu0_irqstack[]; 32 33 int __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.u.thread.proc = start_kernel_proc; 41 init_task.thread.request.u.thread.arg = NULL; 42 return start_idle_thread(task_stack_page(&init_task), 43 &init_task.thread.switch_buf); 44 } 45 46 unsigned long current_stub_stack(void) 47 { 48 if (current->mm == NULL) 49 return 0; 50 51 return current->mm->context.id.stack; 52 } 53