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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 <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 <arch/mm/memory_init.h>

#include <mm/frame.h>

#include <mm/page.h>

#include <mm/tlb.h>

#include <synch/waitq.h>

#include <arch/arch.h>

#include <arch.h>

#include <arch/faddr.h>

#include <typedefs.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 or the low level assembler code with

 * appropriate sizes and addresses.

 */

__address hardcoded_load_address = 0;

size_t hardcoded_ktext_size = 0;

size_t hardcoded_kdata_size = 0;

/*

 * Size of memory in bytes taken by kernel and heap.

 */

static size_t kernel_size;

/*

 * Extra space on heap to make the stack start on page boundary.

 */

static size_t heap_delta;

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);

/** Bootstrap CPU main kernel routine

 *

 * Initializes the kernel by bootstrap CPU.

 *

 * Assuming cpu_priority_high().

 *

 */

void main_bsp(void)

{

    config.cpu_count = 1;

    config.cpu_active = 1;

    kernel_size = hardcoded_ktext_size + hardcoded_kdata_size + CONFIG_HEAP_SIZE;    

    heap_delta = PAGE_SIZE - ((hardcoded_load_address + kernel_size) % PAGE_SIZE);

    heap_delta = (heap_delta == PAGE_SIZE) ? 0 : heap_delta;

    kernel_size += heap_delta;

    config.base = hardcoded_load_address;

    config.memory_size = get_memory_size();

    config.kernel_size = kernel_size + CONFIG_STACK_SIZE;

    context_save(&ctx);

    early_mapping(config.base + hardcoded_ktext_size + hardcoded_kdata_size + heap_delta, CONFIG_STACK_SIZE + CONFIG_HEAP_SIZE);

    context_set(&ctx, FADDR(main_bsp_separated_stack), config.base + kernel_size, CONFIG_STACK_SIZE);

    context_restore(&ctx);

    /* not reached */

}

/** Bootstrap CPU main kernel routine stack wrapper

 *

 * Second part of main_bsp().

 *

 */

void main_bsp_separated_stack(void)

{

    vm_t *m;

    task_t *k;

    thread_t *t;

    the_initialize(THE);

    arch_pre_mm_init();

    heap_init(config.base + hardcoded_ktext_size + hardcoded_kdata_size, CONFIG_HEAP_SIZE + heap_delta);

    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.memory_size=%dM\n", config.memory_size/(1024*1024));

    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(GET_PTL0_ADDRESS());

    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__

/** Application CPUs main kernel routine

 *

 * Executed by application processors, temporary stack

 * is at ctx.sp which was set during BP boot.

 *

 * Assuming  cpu_priority_high().

 *

 */

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++;

    /*

     * The THE structure is well defined because ctx.sp is used as stack.

     */

    the_initialize(THE);

    arch_pre_mm_init();

    frame_init();

    page_init();

    arch_post_mm_init();

    cpu_init();

    calibrate_delay_loop();

    l_apic_init();

    l_apic_debug();

    the_copy(THE, (the_t *) CPU->stack);

    /*

     * 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.

     */

    context_set(&CPU->saved_context, FADDR(main_ap_separated_stack), CPU->stack, CPU_STACK_SIZE);

    context_restore(&CPU->saved_context);

    /* not reached */

}

/** Application CPUs main kernel routine stack wrapper

 *

 * Second part of main_ap().

 *

 */

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__*/