process.c

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/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <linux/init.h>
#include <linux/sched.h>
#include <as-layout.h>
#include <kern.h>
#include <os.h>
#include <skas.h>

int new_mm(unsigned long stack)
{
    int fd, err;

    fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
    if (fd < 0)
        return fd;

    if (skas_needs_stub) {
        err = map_stub_pages(fd, STUB_CODE, STUB_DATA, stack);
        if (err) {
            os_close_file(fd);
            return err;
        }
    }

    return fd;
}

extern void start_kernel(void);

static int __init start_kernel_proc(void *unused)
{
    int pid;

    block_signals();
    pid = os_getpid();

    cpu_tasks[0].pid = pid;
    cpu_tasks[0].task = current;
#ifdef CONFIG_SMP
    init_cpu_online(get_cpu_mask(0));
#endif
    start_kernel();
    return 0;
}

extern int userspace_pid[];

extern char cpu0_irqstack[];

int __init start_uml(void)
{
    stack_protections((unsigned long) &cpu0_irqstack);
    set_sigstack(cpu0_irqstack, THREAD_SIZE);
    if (proc_mm) {
        userspace_pid[0] = start_userspace(0);
        if (userspace_pid[0] < 0) {
            printf("start_uml - start_userspace returned %d\n",
                   userspace_pid[0]);
            exit(1);
        }
    }

    init_new_thread_signals();

    init_task.thread.request.u.thread.proc = start_kernel_proc;
    init_task.thread.request.u.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;
}