/*
 * Copyright (c) 2009 Pavel Rimsky
 * 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 sparc64interrupt
 * @{
 */
/** @file
 */

#include <arch/interrupt.h>
#include <arch/trap/interrupt.h>
#include <arch/sparc64.h>
#include <arch/trap/interrupt.h>
#include <interrupt.h>
#include <ddi/irq.h>
#include <arch/types.h>
#include <debug.h>
#include <arch/asm.h>
#include <arch/barrier.h>
#include <print.h>
#include <arch.h>
#include <mm/tlb.h>
#include <config.h>
#include <synch/spinlock.h>
#include <arch/sun4v/hypercall.h>

/** number of uint64_t-s in one CPU mondo message */
#define CPU_MONDO_ENTRY_SIZE	8

/** number of entries (messages) in the CPU mondo queue */
#define CPU_MONDO_NENTRIES	8

/** number of uint64_t-s in the CPU mondo queue */
#define CPU_MONDO_QUEUE_SIZE	((CPU_MONDO_NENTRIES) * (CPU_MONDO_ENTRY_SIZE))

/** used to identify CPU mondo queue in the hypercall */
#define CPU_MONDO_QUEUE_ID	0x3c

/** ASI for reading/writing CPU mondo head/tail registers */
#define ASI_QUEUE		0x25

/** VA for reading the CPU mondo tail */
#define VA_CPU_MONDO_QUEUE_TAIL	0x3c8

/** VA for reading/writing the CPU mondo head */
#define VA_CPU_MONDO_QUEUE_HEAD	0x3c0

/**
 * array which contains CPU mondo queue for every CPU
 */
uint64_t cpu_mondo_queues[MAX_NUM_STRANDS][CPU_MONDO_QUEUE_SIZE]
	__attribute__((aligned(
	CPU_MONDO_QUEUE_SIZE * sizeof(uint64_t))));

/**
 * Initializes CPU mondo queue for the current CPU.
 */
void sun4v_ipi_init(void)
{
	if (__hypercall_fast3(
		CPU_QCONF,
		CPU_MONDO_QUEUE_ID,
		KA2PA(cpu_mondo_queues[CPU->id]),
		CPU_MONDO_NENTRIES) != EOK)
			panic("Initializing mondo queue failed on CPU %d.\n",
			CPU->arch.id);
}

/**
 * Handler of the CPU Mondo trap. Reads the message queue, updates the head
 * register and processes the message (invokes a function call).
 */
void cpu_mondo(void)
{
	unsigned int tail = asi_u64_read(ASI_QUEUE, VA_CPU_MONDO_QUEUE_TAIL);
	unsigned int head = asi_u64_read(ASI_QUEUE, VA_CPU_MONDO_QUEUE_HEAD);

	while (head != tail) {

		uint64_t data1 = cpu_mondo_queues[CPU->id][0];

		head = (head + CPU_MONDO_ENTRY_SIZE * sizeof(uint64_t)) %
			(CPU_MONDO_QUEUE_SIZE * sizeof(uint64_t));
		asi_u64_write(ASI_QUEUE, VA_CPU_MONDO_QUEUE_HEAD, head);

		if (data1 == (uint64_t) tlb_shootdown_ipi_recv) {
			((void (*)(void)) data1)();
		} else {
			printf("Spurious interrupt on %d, data = %lx.\n",
				CPU->arch.id, data1);
		}

	}

}

/** @}
 */