LXR linux/arch/arm/kvm/reset.c

   1/*
   2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3 * Author: Christoffer Dall <c.dall@virtualopensystems.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, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17 */
  18#include <linux/compiler.h>
  19#include <linux/errno.h>
  20#include <linux/sched.h>
  21#include <linux/kvm_host.h>
  22#include <linux/kvm.h>
  23
  24#include <asm/unified.h>
  25#include <asm/ptrace.h>
  26#include <asm/cputype.h>
  27#include <asm/kvm_arm.h>
  28#include <asm/kvm_coproc.h>
  29
  30#include <kvm/arm_arch_timer.h>
  31
  32/******************************************************************************
  33 * Cortex-A15 and Cortex-A7 Reset Values
  34 */
  35
  36static struct kvm_regs cortexa_regs_reset = {
  37        .usr_regs.ARM_cpsr = SVC_MODE | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT,
  38};
  39
  40static const struct kvm_irq_level cortexa_vtimer_irq = {
  41        { .irq = 27 },
  42        .level = 1,
  43};
  44
  45
  46/*******************************************************************************
  47 * Exported reset function
  48 */
  49
  50/**
  51 * kvm_reset_vcpu - sets core registers and cp15 registers to reset value
  52 * @vcpu: The VCPU pointer
  53 *
  54 * This function finds the right table above and sets the registers on the
  55 * virtual CPU struct to their architectually defined reset values.
  56 */
  57int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
  58{
  59        struct kvm_regs *reset_regs;
  60        const struct kvm_irq_level *cpu_vtimer_irq;
  61
  62        switch (vcpu->arch.target) {
  63        case KVM_ARM_TARGET_CORTEX_A7:
  64        case KVM_ARM_TARGET_CORTEX_A15:
  65                reset_regs = &cortexa_regs_reset;
  66                vcpu->arch.midr = read_cpuid_id();
  67                cpu_vtimer_irq = &cortexa_vtimer_irq;
  68                break;
  69        default:
  70                return -ENODEV;
  71        }
  72
  73        /* Reset core registers */
  74        memcpy(&vcpu->arch.ctxt.gp_regs, reset_regs, sizeof(vcpu->arch.ctxt.gp_regs));
  75
  76        /* Reset CP15 registers */
  77        kvm_reset_coprocs(vcpu);
  78
  79        /* Reset arch_timer context */
  80        return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
  81}
  82