source: mainline/kernel/generic/src/main/kinit.c@ a064d4f

/*
 * 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 kernel_generic
 * @{
 */

/**
 * @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 <assert.h>
#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 <halt.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 <stdio.h>
#include <log.h>
#include <memw.h>
#include <console/console.h>
#include <interrupt.h>
#include <console/kconsole.h>
#include <security/perm.h>
#include <lib/rd.h>
#include <ipc/ipc.h>
#include <str.h>
#include <str_error.h>
#include <sysinfo/stats.h>
#include <sysinfo/sysinfo.h>
#include <align.h>
#include <stdlib.h>
#include <debug/register.h>

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

#include <synch/waitq.h>
#include <synch/spinlock.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;

        interrupts_disable();

#ifdef CONFIG_SMP
        if (config.cpu_count > 1) {
                semaphore_initialize(&ap_completion_semaphore, 0);

                /*
                 * 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)
                        panic("Unable to create kmp thread.");

                thread_wire(thread, &cpus[0]);
                thread_ready(thread_ref(thread));
                thread_join(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
                                log(LF_OTHER, LVL_ERROR,
                                    "Unable to create kcpulb thread for cpu%u", i);
                }
        }
#endif /* CONFIG_SMP */

        /*
         * At this point SMP, if present, is configured.
         */
        ARCH_OP(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
                log(LF_OTHER, LVL_ERROR, "Unable to create kload thread");

#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
                        log(LF_OTHER, LVL_ERROR,
                            "Unable to create kconsole thread");
        }
#endif /* CONFIG_KCONSOLE */

        /*
         * Store the default stack size in sysinfo so that uspace can create
         * stack with this default size.
         */
        sysinfo_set_item_val("default.stack_size", NULL, STACK_SIZE_USER);

        interrupts_enable();

        /*
         * Create user tasks, load RAM disk images.
         */
        size_t i;
        program_t programs[CONFIG_INIT_TASKS] = { };

        // FIXME: do not propagate arguments through sysinfo
        // but pass them directly to the tasks
        for (i = 0; i < init.cnt; i++) {
                const char *arguments = init.tasks[i].arguments;
                if (str_length(arguments) == 0)
                        continue;
                if (str_length(init.tasks[i].name) == 0)
                        continue;
                size_t arguments_size = str_size(arguments);

                void *arguments_copy = malloc(arguments_size);
                if (arguments_copy == NULL)
                        continue;
                memcpy(arguments_copy, arguments, arguments_size);

                char item_name[CONFIG_TASK_NAME_BUFLEN + 15];
                snprintf(item_name, CONFIG_TASK_NAME_BUFLEN + 15,
                    "init_args.%s", init.tasks[i].name);

                sysinfo_set_item_data(item_name, NULL, arguments_copy, arguments_size);
        }

        for (i = 0; i < init.cnt; i++) {
                if (init.tasks[i].paddr % FRAME_SIZE) {
                        log(LF_OTHER, LVL_ERROR,
                            "init[%zu]: Address is not frame aligned", 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>";

                static_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_SIZE,
                    PAGE_READ | PAGE_WRITE | PAGE_CACHEABLE);
                assert(page);

                if (str_cmp(name, "kernel.dbg") == 0) {
                        /*
                         * Not an actual init task, but rather debug sections extracted
                         * from the kernel ELF file and handed to us here so we can use
                         * it for debugging.
                         */

                        register_debug_data((void *) page, init.tasks[i].size);
                        programs[i].task = NULL;
                        continue;
                }

                if (str_cmp(name, "loader") == 0) {
                        /* Register image as the program loader */
                        if (program_loader == NULL) {
                                program_loader = (void *) page;
                                log(LF_OTHER, LVL_NOTE, "Program loader at %p",
                                    program_loader);
                        } else {
                                log(LF_OTHER, LVL_ERROR,
                                    "init[%zu]: Second binary named \"loader\""
                                    " present.", i);
                        }

                        programs[i].task = NULL;
                        continue;
                }

                errno_t rc = program_create_from_image((void *) page, init.tasks[i].size, namebuf,
                    &programs[i]);

                if (rc == 0) {
                        assert(programs[i].task != NULL);

                        /*
                         * Set permissions to init userspace tasks.
                         */
                        perm_set(programs[i].task,
                            PERM_PERM | PERM_MEM_MANAGER |
                            PERM_IO_MANAGER | PERM_IRQ_REG);

                        if (!ipc_box_0) {
                                ipc_box_0 = &programs[i].task->answerbox;
                                /*
                                 * Hold the first task so that
                                 * ipc_box_0 remains a valid pointer
                                 * even if the first task exits for
                                 * whatever reason.
                                 */
                                task_hold(programs[i].task);
                        }

                } 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 {
                        log(LF_OTHER, LVL_ERROR,
                            "init[%zu]: Init binary load failed "
                            "(error %s, loader status %s)", i,
                            str_error_name(rc), str_error_name(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 */
}

/** @}
 */