/*
 * Copyright (c) 2005 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_ia64
 * @{
 */
/** @file
 */

#include <arch.h>
#include <arch/arch.h>
#include <typedefs.h>
#include <errno.h>
#include <interrupt.h>
#include <arch/interrupt.h>
#include <macros.h>
#include <stdbool.h>
#include <str.h>
#include <userspace.h>
#include <console/console.h>
#include <syscall/syscall.h>
#include <sysinfo/sysinfo.h>
#include <arch/drivers/it.h>
#include <arch/drivers/kbd.h>
#include <arch/legacyio.h>
#include <genarch/drivers/ega/ega.h>
#include <genarch/drivers/i8042/i8042.h>
#include <genarch/drivers/ns16550/ns16550.h>
#include <genarch/drivers/legacy/ia32/io.h>
#include <genarch/kbrd/kbrd.h>
#include <genarch/srln/srln.h>
#include <mm/page.h>
#include <mm/km.h>

#ifdef MACHINE_ski
#include <arch/drivers/ski.h>
#endif

static void ia64_pre_mm_init(void);
static void ia64_post_mm_init(void);
static void ia64_post_smp_init(void);

arch_ops_t ia64_ops = {
	.pre_mm_init = ia64_pre_mm_init,
	.post_mm_init = ia64_post_mm_init,
	.post_smp_init = ia64_post_smp_init,
};

arch_ops_t *arch_ops = &ia64_ops;

/* NS16550 as a COM 1 */
#define NS16550_IRQ  (4 + LEGACY_INTERRUPT_BASE)

bootinfo_t *bootinfo;

static uint64_t iosapic_base = 0xfec00000;
uintptr_t legacyio_virt_base = 0;

/** Performs ia64-specific initialization before main_bsp() is called. */
void ia64_pre_main(void)
{
	init.cnt = min3(bootinfo->taskmap.cnt, TASKMAP_MAX_RECORDS,
	    CONFIG_INIT_TASKS);
	size_t i;

	for (i = 0; i < init.cnt; i++) {
		init.tasks[i].paddr =
		    (uintptr_t) bootinfo->taskmap.tasks[i].addr;
		init.tasks[i].size = bootinfo->taskmap.tasks[i].size;
		str_cpy(init.tasks[i].name, CONFIG_TASK_NAME_BUFLEN,
		    bootinfo->taskmap.tasks[i].name);
	}
}

void ia64_pre_mm_init(void)
{
	if (config.cpu_active == 1)
		exception_init();
}

static void iosapic_init(void)
{
	uintptr_t IOSAPIC = km_map(iosapic_base, PAGE_SIZE, PAGE_SIZE,
	    PAGE_WRITE | PAGE_NOT_CACHEABLE);
	int i;

	int myid, myeid;

	myid = ia64_get_cpu_id();
	myeid = ia64_get_cpu_eid();

	for (i = 0; i < 16; i++) {
		if (i == 2)
			continue;	 /* Disable Cascade interrupt */
		((uint32_t *)(IOSAPIC + 0x00))[0] = 0x10 + 2 * i;
		srlz_d();
		((uint32_t *)(IOSAPIC + 0x10))[0] = LEGACY_INTERRUPT_BASE + i;
		srlz_d();
		((uint32_t *)(IOSAPIC + 0x00))[0] = 0x10 + 2 * i + 1;
		srlz_d();
		((uint32_t *)(IOSAPIC + 0x10))[0] = myid << (56 - 32) |
		    myeid << (48 - 32);
		srlz_d();
	}

}

void ia64_post_mm_init(void)
{
	if (config.cpu_active == 1) {
		/* Map the page with legacy I/O. */
		legacyio_virt_base = km_map(LEGACYIO_PHYS_BASE, LEGACYIO_SIZE,
		    KM_NATURAL_ALIGNMENT, PAGE_WRITE | PAGE_NOT_CACHEABLE);

		iosapic_init();
		irq_init(INR_COUNT, INR_COUNT);
	}
	it_init();
}

void ia64_post_smp_init(void)
{
	static const char *platform;

	/* Set platform name. */
#ifdef MACHINE_ski
	platform = "ski";
#endif
#ifdef MACHINE_i460GX
	platform = "pc";
#endif
	sysinfo_set_item_data("platform", NULL, (void *) platform,
	    str_size(platform));

#ifdef MACHINE_ski
	ski_instance_t *ski_instance = skiin_init();
	if (ski_instance) {
		srln_instance_t *srln_instance = srln_init();
		if (srln_instance) {
			indev_t *sink = stdin_wire();
			indev_t *srln = srln_wire(srln_instance, sink);
			skiin_wire(ski_instance, srln);
		}
	}

	outdev_t *skidev = skiout_init();
	if (skidev)
		stdout_wire(skidev);
#endif

#ifdef CONFIG_EGA
	outdev_t *egadev = ega_init(EGA_BASE, EGA_VIDEORAM);
	if (egadev)
		stdout_wire(egadev);
#endif

#ifdef CONFIG_NS16550
	ns16550_instance_t *ns16550_instance =
	    ns16550_init(NS16550_BASE, 0, NS16550_IRQ, NULL, NULL,
	    NULL);
	if (ns16550_instance) {
		srln_instance_t *srln_instance = srln_init();
		if (srln_instance) {
			indev_t *sink = stdin_wire();
			indev_t *srln = srln_wire(srln_instance, sink);
			ns16550_wire(ns16550_instance, srln);
		}
	}

	sysinfo_set_item_val("kbd", NULL, true);
	sysinfo_set_item_val("kbd.inr", NULL, NS16550_IRQ);
	sysinfo_set_item_val("kbd.type", NULL, KBD_NS16550);
	sysinfo_set_item_val("kbd.address.physical", NULL,
	    (uintptr_t) NS16550_BASE);
#endif

#ifdef CONFIG_I8042
	i8042_instance_t *i8042_instance = i8042_init((i8042_t *) I8042_BASE,
	    IRQ_KBD);
	if (i8042_instance) {
		kbrd_instance_t *kbrd_instance = kbrd_init();
		if (kbrd_instance) {
			indev_t *sink = stdin_wire();
			indev_t *kbrd = kbrd_wire(kbrd_instance, sink);
			i8042_wire(i8042_instance, kbrd);
		}
	}
#endif

	sysinfo_set_item_val("ia64_iospace", NULL, true);
	sysinfo_set_item_val("ia64_iospace.address", NULL, true);
	sysinfo_set_item_val("ia64_iospace.address.virtual", NULL, LEGACYIO_USER_BASE);
}

uintptr_t arch_get_initial_sp(uintptr_t stack_base, uintptr_t stack_size)
{
	return ALIGN_DOWN(stack_base + stack_size / 2, STACK_ALIGNMENT);
}

/** Enter userspace and never return. */
void userspace(uintptr_t pc, uintptr_t sp)
{
	psr_t psr;
	rsc_t rsc;

	psr.value = psr_read();
	psr.cpl = PL_USER;
	psr.i = true;			/* start with interrupts enabled */
	psr.ic = true;
	psr.ri = 0;			/* start with instruction #0 */
	psr.bn = 1;			/* start in bank 0 */

	asm volatile ("mov %0 = ar.rsc\n" : "=r" (rsc.value));
	rsc.loadrs = 0;
	rsc.be = false;
	rsc.pl = PL_USER;
	rsc.mode = 3;			/* eager mode */

	/*
	 * Switch to userspace.
	 *
	 * When calculating stack addresses, mind the stack split between the
	 * memory stack and the RSE stack.
	 * Memory stack occupies area under sp, while RSE stack occupies area above.
	 */
	switch_to_userspace(pc,
	    sp, sp + ALIGN_UP(STACK_ITEM_SIZE, STACK_ALIGNMENT),
	    0, psr.value, rsc.value);

	while (true)
		;
}

void arch_reboot(void)
{
	pio_write_8((ioport8_t *)0x64, 0xfe);
	while (true)
		;
}

/** Construct function pointer
 *
 * @param fptr   function pointer structure
 * @param addr   function address
 * @param caller calling function address
 *
 * @return address of the function pointer
 *
 */
void *arch_construct_function(fncptr_t *fptr, void *addr, void *caller)
{
	fptr->fnc = (sysarg_t) addr;
	fptr->gp = ((sysarg_t *) caller)[1];

	return (void *) fptr;
}

void irq_initialize_arch(irq_t *irq)
{
	(void) irq;
}

/** @}
 */