From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/arm/kvm/reset.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 arch/arm/kvm/reset.c

(limited to 'arch/arm/kvm/reset.c')

diff --git a/arch/arm/kvm/reset.c b/arch/arm/kvm/reset.c
new file mode 100644
index 00000000..f558c073
--- /dev/null
+++ b/arch/arm/kvm/reset.c
@@ -0,0 +1,83 @@
+/*
+ * 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_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 architectually defined reset values.
+ */
+int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
+{
+	struct kvm_regs *reset_regs;
+	const struct kvm_irq_level *cpu_vtimer_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;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	/* Reset core registers */
+	memcpy(&vcpu->arch.regs, reset_regs, sizeof(vcpu->arch.regs));
+
+	/* Reset CP15 registers */
+	kvm_reset_coprocs(vcpu);
+
+	/* Reset arch_timer context */
+	kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq);
+
+	return 0;
+}
-- 
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