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/*
 * 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 <panic.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/mps.h>
#endif /* __SMP__ */

#include <smp/smp.h>

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

#include <arch.h>
#include <arch/faddr.h>

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

config_t config;
context_t ctx;

/*
 * These 'hardcoded' variables will be intialised by
 * the linker with appropriate sizes and addresses.
 */
__address 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 - SP_DELTA;
    ctx.pc = FADDR(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\n%s\n", project, copyright);

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

    arch_late_init();
    
    smp_init();
    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-SP_DELTA];
    CPU->saved_context.pc = FADDR(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__*/