include/kvm/arm_arch_timer.h

   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
  26 struct arch_timer_kvm {
  27         /* Is the timer enabled */
  28         bool                    enabled;
  29
  30         /* Virtual offset */
  31         cycle_t                 cntvoff;
  32 };
  33
  34 struct arch_timer_cpu {
  35         /* Registers: control register, timer value */
  36         u32                             cntv_ctl;       /* Saved/restored */
  37         cycle_t                         cntv_cval;      /* Saved/restored */
  38
  39         /*
  40          * Anything that is not used directly from assembly code goes
  41          * here.
  42          */
  43
  44         /* Background timer used when the guest is not running */
  45         struct hrtimer                  timer;
  46
  47         /* Work queued with the above timer expires */
  48         struct work_struct              expired;
  49
  50         /* Background timer active */
  51         bool                            armed;
  52
  53         /* Timer IRQ */
  54         const struct kvm_irq_level      *irq;
  55 };
  56
  57 int kvm_timer_hyp_init(void);
  58 void kvm_timer_enable(struct kvm *kvm);
  59 void kvm_timer_init(struct kvm *kvm);
  60 void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
  61                           const struct kvm_irq_level *irq);
  62 void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
  63 void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu);
  64 void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
  65 void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
  66
  67 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
  68 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
  69
  70 bool kvm_timer_should_fire(struct kvm_vcpu *vcpu);
  71
  72 #endif