/*
 * Copyright (C) 2012,2013 - ARM Ltd
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 *
 * Derived from arch/arm/include/uapi/asm/kvm.h:
 * 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef __ARM_KVM_H__
#define __ARM_KVM_H__

#define KVM_SPSR_EL1	0
#define KVM_SPSR_SVC	KVM_SPSR_EL1
#define KVM_SPSR_ABT	1
#define KVM_SPSR_UND	2
#define KVM_SPSR_IRQ	3
#define KVM_SPSR_FIQ	4
#define KVM_NR_SPSR	5

#ifndef __ASSEMBLY__
#include <linux/psci.h>
#include <linux/types.h>
#include <asm/ptrace.h>

#define __KVM_HAVE_GUEST_DEBUG
#define __KVM_HAVE_IRQ_LINE
#define __KVM_HAVE_READONLY_MEM

#define KVM_REG_SIZE(id)						\
	(1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT))

struct kvm_regs {
	struct user_pt_regs regs;	/* sp = sp_el0 */

	__u64	sp_el1;
	__u64	elr_el1;

	__u64	spsr[KVM_NR_SPSR];

	struct user_fpsimd_state fp_regs;
};

/*
 * Supported CPU Targets - Adding a new target type is not recommended,
 * unless there are some special registers not supported by the
 * genericv8 syreg table.
 */
#define KVM_ARM_TARGET_AEM_V8		0
#define KVM_ARM_TARGET_FOUNDATION_V8	1
#define KVM_ARM_TARGET_CORTEX_A57	2
#define KVM_ARM_TARGET_XGENE_POTENZA	3
#define KVM_ARM_TARGET_CORTEX_A53	4
/* Generic ARM v8 target */
#define KVM_ARM_TARGET_GENERIC_V8	5

#define KVM_ARM_NUM_TARGETS		6

/* KVM_ARM_SET_DEVICE_ADDR ioctl id encoding */
#define KVM_ARM_DEVICE_TYPE_SHIFT	0
#define KVM_ARM_DEVICE_TYPE_MASK	(0xffff << KVM_ARM_DEVICE_TYPE_SHIFT)
#define KVM_ARM_DEVICE_ID_SHIFT		16
#define KVM_ARM_DEVICE_ID_MASK		(0xffff << KVM_ARM_DEVICE_ID_SHIFT)

/* Supported device IDs */
#define KVM_ARM_DEVICE_VGIC_V2		0

/* Supported VGIC address types  */
#define KVM_VGIC_V2_ADDR_TYPE_DIST	0
#define KVM_VGIC_V2_ADDR_TYPE_CPU	1

#define KVM_VGIC_V2_DIST_SIZE		0x1000
#define KVM_VGIC_V2_CPU_SIZE		0x2000

/* Supported VGICv3 address types  */
#define KVM_VGIC_V3_ADDR_TYPE_DIST	2
#define KVM_VGIC_V3_ADDR_TYPE_REDIST	3

#define KVM_VGIC_V3_DIST_SIZE		SZ_64K
#define KVM_VGIC_V3_REDIST_SIZE		(2 * SZ_64K)

#define KVM_ARM_VCPU_POWER_OFF		0 /* CPU is started in OFF state */
#define KVM_ARM_VCPU_EL1_32BIT		1 /* CPU running a 32bit VM */
#define KVM_ARM_VCPU_PSCI_0_2		2 /* CPU uses PSCI v0.2 */
#define KVM_ARM_VCPU_PMU_V3		3 /* Support guest PMUv3 */

struct kvm_vcpu_init {
	__u32 target;
	__u32 features[7];
};

struct kvm_sregs {
};

struct kvm_fpu {
};

/*
 * See v8 ARM ARM D7.3: Debug Registers
 *
 * The architectural limit is 16 debug registers of each type although
 * in practice there are usually less (see ID_AA64DFR0_EL1).
 *
 * Although the control registers are architecturally defined as 32
 * bits wide we use a 64 bit structure here to keep parity with
 * KVM_GET/SET_ONE_REG behaviour which treats all system registers as
 * 64 bit values. It also allows for the possibility of the
 * architecture expanding the control registers without having to
 * change the userspace ABI.
 */
#define KVM_ARM_MAX_DBG_REGS 16
struct kvm_guest_debug_arch {
	__u64 dbg_bcr[KVM_ARM_MAX_DBG_REGS];
	__u64 dbg_bvr[KVM_ARM_MAX_DBG_REGS];
	__u64 dbg_wcr[KVM_ARM_MAX_DBG_REGS];
	__u64 dbg_wvr[KVM_ARM_MAX_DBG_REGS];
};

struct kvm_debug_exit_arch {
	__u32 hsr;
	__u64 far;	/* used for watchpoints */
};

/*
 * Architecture specific defines for kvm_guest_debug->control
 */

#define KVM_GUESTDBG_USE_SW_BP		(1 << 16)
#define KVM_GUESTDBG_USE_HW		(1 << 17)

struct kvm_sync_regs {
};

struct kvm_arch_memory_slot {
};

/* If you need to interpret the index values, here is the key: */
#define KVM_REG_ARM_COPROC_MASK		0x000000000FFF0000
#define KVM_REG_ARM_COPROC_SHIFT	16

/* Normal registers are mapped as coprocessor 16. */
#define KVM_REG_ARM_CORE		(0x0010 << KVM_REG_ARM_COPROC_SHIFT)
#define KVM_REG_ARM_CORE_REG(name)	(offsetof(struct kvm_regs, name) / sizeof(__u32))

/* Some registers need more space to represent values. */
#define KVM_REG_ARM_DEMUX		(0x0011 << KVM_REG_ARM_COPROC_SHIFT)
#define KVM_REG_ARM_DEMUX_ID_MASK	0x000000000000FF00
#define KVM_REG_ARM_DEMUX_ID_SHIFT	8
#define KVM_REG_ARM_DEMUX_ID_CCSIDR	(0x00 << KVM_REG_ARM_DEMUX_ID_SHIFT)
#define KVM_REG_ARM_DEMUX_VAL_MASK	0x00000000000000FF
#define KVM_REG_ARM_DEMUX_VAL_SHIFT	0

/* AArch64 system registers */
#define KVM_REG_ARM64_SYSREG		(0x0013 << KVM_REG_ARM_COPROC_SHIFT)
#define KVM_REG_ARM64_SYSREG_OP0_MASK	0x000000000000c000
#define KVM_REG_ARM64_SYSREG_OP0_SHIFT	14
#define KVM_REG_ARM64_SYSREG_OP1_MASK	0x0000000000003800
#define KVM_REG_ARM64_SYSREG_OP1_SHIFT	11
#define KVM_REG_ARM64_SYSREG_CRN_MASK	0x0000000000000780
#define KVM_REG_ARM64_SYSREG_CRN_SHIFT	7
#define KVM_REG_ARM64_SYSREG_CRM_MASK	0x0000000000000078
#define KVM_REG_ARM64_SYSREG_CRM_SHIFT	3
#define KVM_REG_ARM64_SYSREG_OP2_MASK	0x0000000000000007
#define KVM_REG_ARM64_SYSREG_OP2_SHIFT	0

#define ARM64_SYS_REG_SHIFT_MASK(x,n) \
	(((x) << KVM_REG_ARM64_SYSREG_ ## n ## _SHIFT) & \
	KVM_REG_ARM64_SYSREG_ ## n ## _MASK)

#define __ARM64_SYS_REG(op0,op1,crn,crm,op2) \
	(KVM_REG_ARM64 | KVM_REG_ARM64_SYSREG | \
	ARM64_SYS_REG_SHIFT_MASK(op0, OP0) | \
	ARM64_SYS_REG_SHIFT_MASK(op1, OP1) | \
	ARM64_SYS_REG_SHIFT_MASK(crn, CRN) | \
	ARM64_SYS_REG_SHIFT_MASK(crm, CRM) | \
	ARM64_SYS_REG_SHIFT_MASK(op2, OP2))

#define ARM64_SYS_REG(...) (__ARM64_SYS_REG(__VA_ARGS__) | KVM_REG_SIZE_U64)

#define KVM_REG_ARM_TIMER_CTL		ARM64_SYS_REG(3, 3, 14, 3, 1)
#define KVM_REG_ARM_TIMER_CNT		ARM64_SYS_REG(3, 3, 14, 3, 2)
#define KVM_REG_ARM_TIMER_CVAL		ARM64_SYS_REG(3, 3, 14, 0, 2)

/* Device Control API: ARM VGIC */
#define KVM_DEV_ARM_VGIC_GRP_ADDR	0
#define KVM_DEV_ARM_VGIC_GRP_DIST_REGS	1
#define KVM_DEV_ARM_VGIC_GRP_CPU_REGS	2
#define   KVM_DEV_ARM_VGIC_CPUID_SHIFT	32
#define   KVM_DEV_ARM_VGIC_CPUID_MASK	(0xffULL << KVM_DEV_ARM_VGIC_CPUID_SHIFT)
#define   KVM_DEV_ARM_VGIC_OFFSET_SHIFT	0
#define   KVM_DEV_ARM_VGIC_OFFSET_MASK	(0xffffffffULL << KVM_DEV_ARM_VGIC_OFFSET_SHIFT)
#define KVM_DEV_ARM_VGIC_GRP_NR_IRQS	3
#define KVM_DEV_ARM_VGIC_GRP_CTRL	4
#define   KVM_DEV_ARM_VGIC_CTRL_INIT	0

/* Device Control API on vcpu fd */
#define KVM_ARM_VCPU_PMU_V3_CTRL	0
#define   KVM_ARM_VCPU_PMU_V3_IRQ	0
#define   KVM_ARM_VCPU_PMU_V3_INIT	1

/* KVM_IRQ_LINE irq field index values */
#define KVM_ARM_IRQ_TYPE_SHIFT		24
#define KVM_ARM_IRQ_TYPE_MASK		0xff
#define KVM_ARM_IRQ_VCPU_SHIFT		16
#define KVM_ARM_IRQ_VCPU_MASK		0xff
#define KVM_ARM_IRQ_NUM_SHIFT		0
#define KVM_ARM_IRQ_NUM_MASK		0xffff

/* irq_type field */
#define KVM_ARM_IRQ_TYPE_CPU		0
#define KVM_ARM_IRQ_TYPE_SPI		1
#define KVM_ARM_IRQ_TYPE_PPI		2

/* out-of-kernel GIC cpu interrupt injection irq_number field */
#define KVM_ARM_IRQ_CPU_IRQ		0
#define KVM_ARM_IRQ_CPU_FIQ		1

/*
 * This used to hold the highest supported SPI, but it is now obsolete
 * and only here to provide source code level compatibility with older
 * userland. The highest SPI number can be set via KVM_DEV_ARM_VGIC_GRP_NR_IRQS.
 */
#ifndef __KERNEL__
#define KVM_ARM_IRQ_GIC_MAX		127
#endif

/* One single KVM irqchip, ie. the VGIC */
#define KVM_NR_IRQCHIPS          1

/* PSCI interface */
#define KVM_PSCI_FN_BASE		0x95c1ba5e
#define KVM_PSCI_FN(n)			(KVM_PSCI_FN_BASE + (n))

#define KVM_PSCI_FN_CPU_SUSPEND		KVM_PSCI_FN(0)
#define KVM_PSCI_FN_CPU_OFF		KVM_PSCI_FN(1)
#define KVM_PSCI_FN_CPU_ON		KVM_PSCI_FN(2)
#define KVM_PSCI_FN_MIGRATE		KVM_PSCI_FN(3)

#define KVM_PSCI_RET_SUCCESS		PSCI_RET_SUCCESS
#define KVM_PSCI_RET_NI			PSCI_RET_NOT_SUPPORTED
#define KVM_PSCI_RET_INVAL		PSCI_RET_INVALID_PARAMS
#define KVM_PSCI_RET_DENIED		PSCI_RET_DENIED

#endif

#endif /* __ARM_KVM_H__ */