LXR linux/arch/mips/kvm/interrupt.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * KVM/MIPS: Interrupt delivery
   7 *
   8 * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
   9 * Authors: Sanjay Lal <sanjayl@kymasys.com>
  10 */
  11
  12#include <linux/errno.h>
  13#include <linux/err.h>
  14#include <linux/vmalloc.h>
  15#include <linux/fs.h>
  16#include <linux/memblock.h>
  17#include <asm/page.h>
  18#include <asm/cacheflush.h>
  19
  20#include <linux/kvm_host.h>
  21
  22#include "interrupt.h"
  23
  24void kvm_mips_deliver_interrupts(struct kvm_vcpu *vcpu, u32 cause)
  25{
  26        unsigned long *pending = &vcpu->arch.pending_exceptions;
  27        unsigned long *pending_clr = &vcpu->arch.pending_exceptions_clr;
  28        unsigned int priority;
  29
  30        if (!(*pending) && !(*pending_clr))
  31                return;
  32
  33        priority = __ffs(*pending_clr);
  34        while (priority <= MIPS_EXC_MAX) {
  35                kvm_mips_callbacks->irq_clear(vcpu, priority, cause);
  36
  37                priority = find_next_bit(pending_clr,
  38                                         BITS_PER_BYTE * sizeof(*pending_clr),
  39                                         priority + 1);
  40        }
  41
  42        priority = __ffs(*pending);
  43        while (priority <= MIPS_EXC_MAX) {
  44                kvm_mips_callbacks->irq_deliver(vcpu, priority, cause);
  45
  46                priority = find_next_bit(pending,
  47                                         BITS_PER_BYTE * sizeof(*pending),
  48                                         priority + 1);
  49        }
  50
  51}
  52
  53int kvm_mips_pending_timer(struct kvm_vcpu *vcpu)
  54{
  55        return test_bit(MIPS_EXC_INT_TIMER, &vcpu->arch.pending_exceptions);
  56}
  57