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4638 rimsky 1
/*
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 * Copyright (c) 2009 Pavel Rimsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup sparc64interrupt
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 * @{
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 */
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/** @file
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 */
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#include <arch/interrupt.h>
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#include <arch/trap/interrupt.h>
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#include <arch/sparc64.h>
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#include <arch/trap/interrupt.h>
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#include <interrupt.h>
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#include <ddi/irq.h>
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#include <arch/types.h>
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#include <debug.h>
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#include <arch/asm.h>
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#include <arch/barrier.h>
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#include <print.h>
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#include <arch.h>
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#include <mm/tlb.h>
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#include <config.h>
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#include <synch/spinlock.h>
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#include <arch/sun4v/hypercall.h>
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/** number of uint64_t-s in one CPU mondo message */
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#define CPU_MONDO_ENTRY_SIZE    8
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/** number of entries (messages) in the CPU mondo queue */
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#define CPU_MONDO_NENTRIES  8
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/** number of uint64_t-s in the CPU mondo queue */
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#define CPU_MONDO_QUEUE_SIZE    ((CPU_MONDO_NENTRIES) * (CPU_MONDO_ENTRY_SIZE))
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/** used to identify CPU mondo queue in the hypercall */
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#define CPU_MONDO_QUEUE_ID  0x3c
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/** ASI for reading/writing CPU mondo head/tail registers */
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#define ASI_QUEUE       0x25
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/** VA for reading the CPU mondo tail */
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#define VA_CPU_MONDO_QUEUE_TAIL 0x3c8
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/** VA for reading/writing the CPU mondo head */
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#define VA_CPU_MONDO_QUEUE_HEAD 0x3c0
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/**
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 * array which contains CPU mondo queue for every CPU
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 */
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uint64_t cpu_mondo_queues[MAX_NUM_STRANDS][CPU_MONDO_QUEUE_SIZE]
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    __attribute__((aligned(
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    CPU_MONDO_QUEUE_SIZE * sizeof(uint64_t))));
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/**
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 * Initializes CPU mondo queue for the current CPU.
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 */
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void sun4v_ipi_init(void)
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{
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    if (__hypercall_fast3(
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        CPU_QCONF,
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        CPU_MONDO_QUEUE_ID,
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        KA2PA(cpu_mondo_queues[CPU->id]),
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        CPU_MONDO_NENTRIES) != EOK)
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            panic("Initializing mondo queue failed on CPU %d.\n",
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            CPU->arch.id);
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}
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/**
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 * Handler of the CPU Mondo trap. Reads the message queue, updates the head
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 * register and processes the message (invokes a function call).
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 */
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void cpu_mondo(void)
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{
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    unsigned int tail = asi_u64_read(ASI_QUEUE, VA_CPU_MONDO_QUEUE_TAIL);
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    unsigned int head = asi_u64_read(ASI_QUEUE, VA_CPU_MONDO_QUEUE_HEAD);
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    while (head != tail) {
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        uint64_t data1 = cpu_mondo_queues[CPU->id][0];
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        head = (head + CPU_MONDO_ENTRY_SIZE * sizeof(uint64_t)) %
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            (CPU_MONDO_QUEUE_SIZE * sizeof(uint64_t));
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        asi_u64_write(ASI_QUEUE, VA_CPU_MONDO_QUEUE_HEAD, head);
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        if (data1 == (uint64_t) tlb_shootdown_ipi_recv) {
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            ((void (*)(void)) data1)();
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        } else {
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            printf("Spurious interrupt on %d, data = %lx.\n",
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                CPU->arch.id, data1);
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        }
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    }
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}
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/** @}
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 */