summaryrefslogtreecommitdiffstats
path: root/arch/arm/kvm/reset.c
blob: 1da8b2d145501c0a9fd26cac7854f0c59107d4ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
/*
 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kvm_host.h>
#include <linux/kvm.h>

#include <asm/unified.h>
#include <asm/ptrace.h>
#include <asm/cputype.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_coproc.h>

#include <kvm/arm_arch_timer.h>

/******************************************************************************
 * Cortex-A15 and Cortex-A7 Reset Values
 */

static struct kvm_regs cortexa_regs_reset = {
	.usr_regs.ARM_cpsr = SVC_MODE | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT,
};

static const struct kvm_irq_level cortexa_ptimer_irq = {
	{ .irq = 30 },
	.level = 1,
};

static const struct kvm_irq_level cortexa_vtimer_irq = {
	{ .irq = 27 },
	.level = 1,
};


/*******************************************************************************
 * Exported reset function
 */

/**
 * kvm_reset_vcpu - sets core registers and cp15 registers to reset value
 * @vcpu: The VCPU pointer
 *
 * This function finds the right table above and sets the registers on the
 * virtual CPU struct to their architecturally defined reset values.
 */
int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
{
	struct kvm_regs *reset_regs;
	const struct kvm_irq_level *cpu_vtimer_irq;
	const struct kvm_irq_level *cpu_ptimer_irq;

	switch (vcpu->arch.target) {
	case KVM_ARM_TARGET_CORTEX_A7:
	case KVM_ARM_TARGET_CORTEX_A15:
		reset_regs = &cortexa_regs_reset;
		vcpu->arch.midr = read_cpuid_id();
		cpu_vtimer_irq = &cortexa_vtimer_irq;
		cpu_ptimer_irq = &cortexa_ptimer_irq;
		break;
	default:
		return -ENODEV;
	}

	/* Reset core registers */
	memcpy(&vcpu->arch.ctxt.gp_regs, reset_regs, sizeof(vcpu->arch.ctxt.gp_regs));

	/* Reset CP15 registers */
	kvm_reset_coprocs(vcpu);

	/* Reset arch_timer context */
	return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq, cpu_ptimer_irq);
}