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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 <debug.h>

#include <config.h>

#include <time/clock.h>

#include <proc/scheduler.h>

#include <proc/thread.h>

#include <proc/task.h>

#include <main/kinit.h>

#include <console/kconsole.h>

#include <cpu.h>

#include <align.h>

#include <interrupt.h>

#include <main/version.h>

#ifdef CONFIG_SMP

#include <arch/smp/apic.h>

#include <arch/smp/mps.h>

#endif /* CONFIG_SMP */

#include <smp/smp.h>

#include <arch/mm/memory_init.h>

#include <mm/heap.h>

#include <mm/frame.h>

#include <mm/page.h>

#include <mm/tlb.h>

#include <mm/vm.h>

#include <synch/waitq.h>

#include <arch/arch.h>

#include <arch.h>

#include <arch/faddr.h>

#include <typedefs.h>

config_t config;

context_t ctx;

/**

 * These 'hardcoded' variables will be intialized 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;

__address init_addr = 0;

size_t init_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);

#ifdef CONFIG_SMP

static void main_ap_separated_stack(void);

#endif

/** Bootstrap CPU main kernel routine

 *

 * Initializes the kernel by bootstrap CPU.

 *

 * Assuming interrupts_disable().

 *

 */

void main_bsp(void)

{

	config.cpu_count = 1;

	config.cpu_active = 1;

	config.base = hardcoded_load_address;

	config.memory_size = get_memory_size();

	config.init_addr = init_addr;

	config.init_size = init_size;

	if (init_size > 0)

		config.heap_addr = init_addr + init_size;

	else

		config.heap_addr = hardcoded_load_address + hardcoded_ktext_size + hardcoded_kdata_size;

	config.heap_size = CONFIG_HEAP_SIZE + (config.memory_size / FRAME_SIZE) * sizeof(frame_t);

	config.kernel_size = ALIGN_UP(config.heap_addr - hardcoded_load_address + config.heap_size, PAGE_SIZE);

	config.heap_delta = config.kernel_size - (config.heap_addr - hardcoded_load_address + config.heap_size);

	config.kernel_size = config.kernel_size + CONFIG_STACK_SIZE;

	context_save(&ctx);

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

	/*

	 * kconsole data structures must be initialized very early

	 * because other subsystems will register their respective

	 * commands.

	 */

	kconsole_init();

	/* Exception handler initialization, before architecture

	 * starts adding its own handlers

	 */

	exc_init();

	arch_pre_mm_init();

	early_heap_init(config.heap_addr, config.heap_size + config.heap_delta);

	frame_init();

	page_init();

	tlb_init();

	arch_post_mm_init();

	version_print();

	printf("%P: hardcoded_ktext_size=%dK, hardcoded_kdata_size=%dK\n",

		config.base, hardcoded_ktext_size/1024, hardcoded_kdata_size/1024);

	arch_pre_smp_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();

	if (config.init_size > 0)

		printf("config.init_addr=%X, config.init_size=%d\n", config.init_addr, config.init_size);

	/*

	 * 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 CONFIG_SMP

/** Application CPUs main kernel routine

 *

 * Executed by application processors, temporary stack

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

 *

 * Assuming interrupts_disable()'d.

 *

 */

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();

	tlb_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), (__address) 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 /* CONFIG_SMP */