| 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 | |
| 16 | extern void start_kernel(void); |
| 17 | |
| 18 | static 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 | |
| 32 | extern int userspace_pid[]; |
| 33 | |
| 34 | extern char cpu0_irqstack[]; |
| 35 | |
| 36 | int __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(task: &init_task), |
| 46 | &init_task.thread.switch_buf); |
| 47 | } |
| 48 | |
| 49 | unsigned long current_stub_stack(void) |
| 50 | { |
| 51 | if (current->mm == NULL) |
| 52 | return 0; |
| 53 | |
| 54 | return current->mm->context.id.stack; |
| 55 | } |
| 56 |