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 <asm/tlbflush.h> 12 13 #include <as-layout.h> 14 #include <kern.h> 15 #include <os.h> 16 #include <skas.h> 17 #include <kern_util.h> 18 19 extern void start_kernel(void); 20 21 static int __init start_kernel_proc(void *unused) 22 { 23 block_signals_trace(); 24 25 cpu_tasks[0].task = current; 26 27 start_kernel(); 28 return 0; 29 } 30 31 extern int userspace_pid[]; 32 33 extern char cpu0_irqstack[]; 34 35 int __init start_uml(void) 36 { 37 stack_protections((unsigned long) &cpu0_irqstack); 38 set_sigstack(cpu0_irqstack, THREAD_SIZE); 39 40 init_new_thread_signals(); 41 42 init_task.thread.request.u.thread.proc = start_kernel_proc; 43 init_task.thread.request.u.thread.arg = NULL; 44 return start_idle_thread(task_stack_page(&init_task), 45 &init_task.thread.switch_buf); 46 } 47 48 unsigned long current_stub_stack(void) 49 { 50 if (current->mm == NULL) 51 return 0; 52 53 return current->mm->context.id.stack; 54 } 55 56 struct mm_id *current_mm_id(void) 57 { 58 if (current->mm == NULL) 59 return NULL; 60 61 return ¤t->mm->context.id; 62 } 63 64 void current_mm_sync(void) 65 { 66 if (current->mm == NULL) 67 return; 68 69 um_tlb_sync(current->mm); 70 } 71