source: mainline/kernel/generic/src/main/kinit.c@ 1066041

/*
 * Copyright (c) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup main
 * @{
 */

/**
 * @file
 * @brief Kernel initialization thread.
 *
 * This file contains kinit kernel thread which carries out
 * high level system initialization.
 *
 * This file is responsible for finishing SMP configuration
 * and creation of userspace init tasks.
 */

#include <main/kinit.h>
#include <config.h>
#include <arch.h>
#include <proc/scheduler.h>
#include <proc/task.h>
#include <proc/thread.h>
#include <proc/program.h>
#include <panic.h>
#include <func.h>
#include <cpu.h>
#include <arch/asm.h>
#include <mm/page.h>
#include <arch/mm/page.h>
#include <mm/as.h>
#include <mm/frame.h>
#include <mm/km.h>
#include <print.h>
#include <memstr.h>
#include <console/console.h>
#include <interrupt.h>
#include <console/kconsole.h>
#include <security/cap.h>
#include <lib/rd.h>
#include <ipc/ipc.h>
#include <debug.h>
#include <str.h>
#include <sysinfo/stats.h>
#include <align.h>

#ifdef CONFIG_SMP
#include <smp/smp.h>
#endif /* CONFIG_SMP */

#include <synch/waitq.h>
#include <synch/spinlock.h>
#include <synch/workqueue.h>
#include <synch/rcu.h>

#define ALIVE_CHARS  4

#ifdef CONFIG_KCONSOLE
static char alive[ALIVE_CHARS] = "-\\|/";
#endif

#define INIT_PREFIX      "init:"
#define INIT_PREFIX_LEN  5

/** Kernel initialization thread.
 *
 * kinit takes care of higher level kernel
 * initialization (i.e. thread creation,
 * userspace initialization etc.).
 *
 * @param arg Not used.
 */
void kinit(void *arg)
{
        thread_t *thread;
        
        /*
         * Detach kinit as nobody will call thread_join_timeout() on it.
         */
        thread_detach(THREAD);

        interrupts_disable();
        
        /* Start processing RCU callbacks. RCU is fully functional afterwards. */
        rcu_kinit_init();
        
        /*
         * Start processing work queue items. Some may have been queued during boot.
         */
        workq_global_worker_init();
        
#ifdef CONFIG_SMP
        if (config.cpu_count > 1) {
                waitq_initialize(&ap_completion_wq);
                
                /*
                 * Create the kmp thread and wait for its completion.
                 * cpu1 through cpuN-1 will come up consecutively and
                 * not mess together with kcpulb threads.
                 * Just a beautification.
                 */
                thread = thread_create(kmp, NULL, TASK,
                    THREAD_FLAG_UNCOUNTED, "kmp");
                if (thread != NULL) {
                        thread_wire(thread, &cpus[0]);
                        thread_ready(thread);
                } else
                        panic("Unable to create kmp thread.");
                
                thread_join(thread);
                thread_detach(thread);
                
                /*
                 * For each CPU, create its load balancing thread.
                 */
                unsigned int i;
                
                for (i = 0; i < config.cpu_count; i++) {
                        thread = thread_create(kcpulb, NULL, TASK,
                            THREAD_FLAG_UNCOUNTED, "kcpulb");
                        if (thread != NULL) {
                                thread_wire(thread, &cpus[i]);
                                thread_ready(thread);
                        } else
                                printf("Unable to create kcpulb thread for cpu%u\n", i);
                }
        }
#endif /* CONFIG_SMP */
        
        /*
         * At this point SMP, if present, is configured.
         */
        arch_post_smp_init();
        
        /* Start thread computing system load */
        thread = thread_create(kload, NULL, TASK, THREAD_FLAG_NONE,
            "kload");
        if (thread != NULL)
                thread_ready(thread);
        else
                printf("Unable to create kload thread\n");
        
#ifdef CONFIG_KCONSOLE
        if (stdin) {
                /*
                 * Create kernel console.
                 */
                thread = thread_create(kconsole_thread, NULL, TASK,
                    THREAD_FLAG_NONE, "kconsole");
                if (thread != NULL)
                        thread_ready(thread);
                else
                        printf("Unable to create kconsole thread\n");
        }
#endif /* CONFIG_KCONSOLE */
        
        interrupts_enable();
        
        /*
         * Create user tasks, load RAM disk images.
         */
        size_t i;
        program_t programs[CONFIG_INIT_TASKS];
        
        for (i = 0; i < init.cnt; i++) {
                if (init.tasks[i].paddr % FRAME_SIZE) {
                        printf("init[%zu]: Address is not frame aligned\n", i);
                        programs[i].task = NULL;
                        continue;
                }
                
                /*
                 * Construct task name from the 'init:' prefix and the
                 * name stored in the init structure (if any).
                 */
                
                char namebuf[TASK_NAME_BUFLEN];
                
                const char *name = init.tasks[i].name;
                if (name[0] == 0)
                        name = "<unknown>";
                
                ASSERT(TASK_NAME_BUFLEN >= INIT_PREFIX_LEN);
                str_cpy(namebuf, TASK_NAME_BUFLEN, INIT_PREFIX);
                str_cpy(namebuf + INIT_PREFIX_LEN,
                    TASK_NAME_BUFLEN - INIT_PREFIX_LEN, name);
                
                /*
                 * Create virtual memory mappings for init task images.
                 */
                uintptr_t page = km_map(init.tasks[i].paddr,
                    init.tasks[i].size,
                    PAGE_READ | PAGE_WRITE | PAGE_CACHEABLE);
                ASSERT(page);
                
                int rc = program_create_from_image((void *) page, namebuf,
                    &programs[i]);
                
                if (rc == 0) {
                        if (programs[i].task != NULL) {
                                /*
                                 * Set capabilities to init userspace tasks.
                                 */
                                cap_set(programs[i].task, CAP_CAP | CAP_MEM_MANAGER |
                                    CAP_IO_MANAGER | CAP_IRQ_REG);
                                
                                if (!ipc_phone_0)
                                        ipc_phone_0 = &programs[i].task->answerbox;
                        }
                        
                        /*
                         * If programs[i].task == NULL then it is
                         * the program loader and it was registered
                         * successfully.
                         */
                } else if (i == init.cnt - 1) {
                        /*
                         * Assume the last task is the RAM disk.
                         */
                        init_rd((void *) init.tasks[i].paddr, init.tasks[i].size);
                } else
                        printf("init[%zu]: Init binary load failed "
                            "(error %d, loader status %u)\n", i, rc,
                            programs[i].loader_status);
        }
        
        /*
         * Run user tasks.
         */
        for (i = 0; i < init.cnt; i++) {
                if (programs[i].task != NULL)
                        program_ready(&programs[i]);
        }
        
#ifdef CONFIG_KCONSOLE
        if (!stdin) {
                thread_sleep(10);
                printf("kinit: No stdin\nKernel alive: .");
                
                unsigned int i = 0;
                while (true) {
                        printf("\b%c", alive[i % ALIVE_CHARS]);
                        thread_sleep(1);
                        i++;
                }
        }
#endif /* CONFIG_KCONSOLE */
}

/** @}
 */