/*
 * Copyright (C) 2012-2015 - ARM Ltd
 * Author: Marc Zyngier <marc.zyngier@arm.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, see <http://www.gnu.org/licenses/>.
 */

#include <linux/compiler.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/kvm_host.h>

#include <asm/kvm_mmu.h>

#include "hyp.h"

/* vcpu is already in the HYP VA space */
void __hyp_text __vgic_v2_save_state(struct kvm_vcpu *vcpu)
{
	struct kvm *kvm = kern_hyp_va(vcpu->kvm);
	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
	struct vgic_dist *vgic = &kvm->arch.vgic;
	void __iomem *base = kern_hyp_va(vgic->vctrl_base);
	u32 eisr0, eisr1, elrsr0, elrsr1;
	int i, nr_lr;

	if (!base)
		return;

	nr_lr = vcpu->arch.vgic_cpu.nr_lr;
	cpu_if->vgic_vmcr = readl_relaxed(base + GICH_VMCR);
	cpu_if->vgic_misr = readl_relaxed(base + GICH_MISR);
	eisr0  = readl_relaxed(base + GICH_EISR0);
	elrsr0 = readl_relaxed(base + GICH_ELRSR0);
	if (unlikely(nr_lr > 32)) {
		eisr1  = readl_relaxed(base + GICH_EISR1);
		elrsr1 = readl_relaxed(base + GICH_ELRSR1);
	} else {
		eisr1 = elrsr1 = 0;
	}
#ifdef CONFIG_CPU_BIG_ENDIAN
	cpu_if->vgic_eisr  = ((u64)eisr0 << 32) | eisr1;
	cpu_if->vgic_elrsr = ((u64)elrsr0 << 32) | elrsr1;
#else
	cpu_if->vgic_eisr  = ((u64)eisr1 << 32) | eisr0;
	cpu_if->vgic_elrsr = ((u64)elrsr1 << 32) | elrsr0;
#endif
	cpu_if->vgic_apr    = readl_relaxed(base + GICH_APR);

	writel_relaxed(0, base + GICH_HCR);

	for (i = 0; i < nr_lr; i++)
		cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));
}

/* vcpu is already in the HYP VA space */
void __hyp_text __vgic_v2_restore_state(struct kvm_vcpu *vcpu)
{
	struct kvm *kvm = kern_hyp_va(vcpu->kvm);
	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
	struct vgic_dist *vgic = &kvm->arch.vgic;
	void __iomem *base = kern_hyp_va(vgic->vctrl_base);
	int i, nr_lr;

	if (!base)
		return;

	writel_relaxed(cpu_if->vgic_hcr, base + GICH_HCR);
	writel_relaxed(cpu_if->vgic_vmcr, base + GICH_VMCR);
	writel_relaxed(cpu_if->vgic_apr, base + GICH_APR);

	nr_lr = vcpu->arch.vgic_cpu.nr_lr;
	for (i = 0; i < nr_lr; i++)
		writel_relaxed(cpu_if->vgic_lr[i], base + GICH_LR0 + (i * 4));
}