LXR linux/include/kvm/arm_arch

   1/*
   2 * Copyright (C) 2012 ARM Ltd.
   3 * Author: Marc Zyngier <marc.zyngier@arm.com>
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License version 2 as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17 */
  18
  19#ifndef __ASM_ARM_KVM_ARCH_TIMER_H
  20#define __ASM_ARM_KVM_ARCH_TIMER_H
  21
  22#include <linux/clocksource.h>
  23#include <linux/hrtimer.h>
  24#include <linux/workqueue.h>
  25
  26struct arch_timer_kvm {
  27#ifdef CONFIG_KVM_ARM_TIMER
  28        /* Is the timer enabled */
  29        bool                    enabled;
  30
  31        /* Virtual offset */
  32        cycle_t                 cntvoff;
  33#endif
  34};
  35
  36struct arch_timer_cpu {
  37#ifdef CONFIG_KVM_ARM_TIMER
  38        /* Registers: control register, timer value */
  39        u32                             cntv_ctl;       /* Saved/restored */
  40        cycle_t                         cntv_cval;      /* Saved/restored */
  41
  42        /*
  43         * Anything that is not used directly from assembly code goes
  44         * here.
  45         */
  46
  47        /* Background timer used when the guest is not running */
  48        struct hrtimer                  timer;
  49
  50        /* Work queued with the above timer expires */
  51        struct work_struct              expired;
  52
  53        /* Background timer active */
  54        bool                            armed;
  55
  56        /* Timer IRQ */
  57        const struct kvm_irq_level      *irq;
  58#endif
  59};
  60
  61#ifdef CONFIG_KVM_ARM_TIMER
  62int kvm_timer_hyp_init(void);
  63int kvm_timer_init(struct kvm *kvm);
  64void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
  65                          const struct kvm_irq_level *irq);
  66void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
  67void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu);
  68void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
  69void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
  70#else
  71static inline int kvm_timer_hyp_init(void)
  72{
  73        return 0;
  74};
  75
  76static inline int kvm_timer_init(struct kvm *kvm)
  77{
  78        return 0;
  79}
  80
  81static inline void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
  82                                        const struct kvm_irq_level *irq) {}
  83static inline void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu) {}
  84static inline void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu) {}
  85static inline void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu) {}
  86static inline void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu) {}
  87#endif
  88
  89#endif
  90