source: mainline/src/main/main.c@ c9b8c5c

/*
 * 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.
 */

#include <arch/asm.h>
#include <arch/context.h>
#include <print.h>
#include <config.h>
#include <time/clock.h>
#include <proc/scheduler.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <mm/vm.h>
#include <main/kinit.h>
#include <cpu.h>
#include <mm/heap.h>

#ifdef __SMP__
#include <arch/smp/apic.h>
#include <arch/smp/mp.h>
#endif /* __SMP__ */

#include <mm/frame.h>
#include <mm/page.h>
#include <mm/tlb.h>
#include <synch/waitq.h>

#include <arch.h>

char *project = "SPARTAN kernel";
char *copyright = "Copyright (C) 2001-2005 Jakub Jermar";

config_t config;
context_t ctx;

/*
 * These 'hardcoded' variables will be intialised by
 * the linker with appropriate sizes and addresses.
 */
__u32 hardcoded_load_address = 0;
__u32 hardcoded_ktext_size = 0;
__u32 hardcoded_kdata_size = 0;

void main_bsp(void);
void main_ap(void);

/*
 * These two functions prevent stack from underflowing during the
 * kernel boot phase when SP is set to the very top of the reserved
 * space. The stack could get corrupted by a fooled compiler-generated
 * pop sequence otherwise.
 */
static void main_bsp_separated_stack(void);
static void main_ap_separated_stack(void);

/*
 * Executed by the bootstrap processor. cpu_priority_high()'d
 */
void main_bsp(void)
{
        config.cpu_count = 1;
        config.cpu_active = 1;

        config.base = hardcoded_load_address;
        config.memory_size = CONFIG_MEMORY_SIZE;
        config.kernel_size = hardcoded_ktext_size + hardcoded_kdata_size + CONFIG_HEAP_SIZE + CONFIG_STACK_SIZE;

        context_save(&ctx);
        ctx.sp = config.base + config.kernel_size - 8;
        ctx.pc = (__address) main_bsp_separated_stack;
        context_restore(&ctx);
        /* not reached */
}

void main_bsp_separated_stack(void) {
        vm_t *m;
        task_t *k;
        thread_t *t;

        arch_pre_mm_init();

        heap_init(config.base + hardcoded_ktext_size + hardcoded_kdata_size, CONFIG_HEAP_SIZE);
        frame_init();
        page_init();
        tlb_init();

        arch_post_mm_init();

        printf("%s, %s\n", project, copyright);

        printf("%L: hardcoded_ktext_size=%dK, hardcoded_kdata_size=%dK\n",
                config.base, hardcoded_ktext_size/1024, hardcoded_kdata_size/1024);

        #ifdef __SMP__
        mp_init();      /* Multiprocessor */
        #endif /* __SMP__ */
        
        printf("config.cpu_count=%d\n", config.cpu_count);

        cpu_init();
        calibrate_delay_loop();

        timeout_init();
        scheduler_init();
        task_init();
        thread_init();

        /*
         * Create kernel vm mapping.
         */
        m = vm_create();
        if (!m) panic("can't create kernel vm address space\n");

        /*
         * Create kernel task.
         */
        k = task_create(m);
        if (!k) panic("can't create kernel task\n");

        /*
         * Create the first thread.
         */
        t = thread_create(kinit, NULL, k, 0);
        if (!t) panic("can't create kinit thread\n");

        thread_ready(t);

        /*
         * This call to scheduler() will return to kinit,
         * starting the thread of kernel threads.
         */
        scheduler();
        /* not reached */
}

#ifdef __SMP__
/*
 * Executed by application processors. cpu_priority_high()'d
 * Temporary stack is at ctx.sp which was set during BP boot.
 */
void main_ap(void)
{
        /*
         * Incrementing the active CPU counter will guarantee that the
         * pm_init() will not attempt to build GDT and IDT tables again.
         * Neither frame_init() will do the complete thing. Neither cpu_init()
         * will do.
         */
        config.cpu_active++;

        arch_pre_mm_init();
        frame_init();
        page_init();
        arch_post_mm_init();

        cpu_init();
        calibrate_delay_loop();

        l_apic_init();
        l_apic_debug();


        /*
         * If we woke kmp up before we left the kernel stack, we could
         * collide with another CPU coming up. To prevent this, we
         * switch to this cpu's private stack prior to waking kmp up.
         */
        CPU->saved_context.sp = (__address) &CPU->stack[CPU_STACK_SIZE-8];
        CPU->saved_context.pc = (__address) main_ap_separated_stack;
        context_restore(&CPU->saved_context);
        /* not reached */
}

void main_ap_separated_stack(void)
{
        /*
         * Configure timeouts for this cpu.
         */
        timeout_init();

        waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
        scheduler();
        /* not reached */
}
#endif /* __SMP__*/