// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) */ #include <linux/init.h>#include <linux/sched/mm.h>#include <linux/sched/task_stack.h>#include <linux/sched/task.h>#include <linux/smp-internal.h> #include <asm/tlbflush.h> #include <as-layout.h>#include <kern.h>#include <os.h>#include <skas.h>#include <kern_util.h> extern void start_kernel(void); static int __init start_kernel_proc(void *unused){	block_signals_trace(); 	start_kernel();	return 0;} char cpu_irqstacks[NR_CPUS][THREAD_SIZE] __aligned(THREAD_SIZE); int __init start_uml(void){	stack_protections((unsigned long) &cpu_irqstacks[0]);	set_sigstack(cpu_irqstacks[0], THREAD_SIZE); 	init_new_thread_signals(); 	init_task.thread.request.thread.proc = start_kernel_proc;	init_task.thread.request.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;} struct mm_id *current_mm_id(void){	if (current->mm == NULL)		return NULL; 	return &current->mm->context.id;} void current_mm_sync(void){	if (current->mm == NULL)		return; 	um_tlb_sync(current->mm);} static DEFINE_SPINLOCK(initial_jmpbuf_spinlock); void initial_jmpbuf_lock(void){	spin_lock_irq(&initial_jmpbuf_spinlock);} void initial_jmpbuf_unlock(void){	spin_unlock_irq(&initial_jmpbuf_spinlock);}