/*
* 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 kernel_sparc64_interrupt
* @{
*/
/** @file
*/
#include <arch/interrupt.h>
#include <arch/trap/interrupt.h>
#include <arch/sparc64.h>
#include <interrupt.h>
#include <ddi/irq.h>
#include <stdint.h>
#include <debug.h>
#include <arch/asm.h>
#include <barrier.h>
#include <log.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) != HV_EOK)
panic("Initializing mondo queue failed on CPU %" PRIu64 ".\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(unsigned int tt, istate_t *istate)
{
#ifdef CONFIG_SMP
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 == (uintptr_t) tlb_shootdown_ipi_recv) {
((void (*)(void)) data1)();
} else {
log(LF_ARCH, LVL_DEBUG, "Spurious interrupt on %" PRIu64
", data = %" PRIx64 ".", CPU->arch.id, data1);
}
}
#endif
}
/** @}
*/