/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * 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.
 */

#ifndef __ARM_KVM_H__
#define __ARM_KVM_H__

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

#define __KVM_HAVE_GUEST_DEBUG
#define __KVM_HAVE_IRQ_LINE
#define __KVM_HAVE_READONLY_MEM
#define __KVM_HAVE_VCPU_EVENTS

#define KVM_COALESCED_MMIO_PAGE_OFFSET 1

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

/* Valid for svc_regs, abt_regs, und_regs, irq_regs in struct kvm_regs */
#define KVM_ARM_SVC_sp          svc_regs[0]
#define KVM_ARM_SVC_lr          svc_regs[1]
#define KVM_ARM_SVC_spsr        svc_regs[2]
#define KVM_ARM_ABT_sp          abt_regs[0]
#define KVM_ARM_ABT_lr          abt_regs[1]
#define KVM_ARM_ABT_spsr        abt_regs[2]
#define KVM_ARM_UND_sp          und_regs[0]
#define KVM_ARM_UND_lr          und_regs[1]
#define KVM_ARM_UND_spsr        und_regs[2]
#define KVM_ARM_IRQ_sp          irq_regs[0]
#define KVM_ARM_IRQ_lr          irq_regs[1]
#define KVM_ARM_IRQ_spsr        irq_regs[2]

/* Valid only for fiq_regs in struct kvm_regs */
#define KVM_ARM_FIQ_r8          fiq_regs[0]
#define KVM_ARM_FIQ_r9          fiq_regs[1]
#define KVM_ARM_FIQ_r10         fiq_regs[2]
#define KVM_ARM_FIQ_fp          fiq_regs[3]
#define KVM_ARM_FIQ_ip          fiq_regs[4]
#define KVM_ARM_FIQ_sp          fiq_regs[5]
#define KVM_ARM_FIQ_lr          fiq_regs[6]
#define KVM_ARM_FIQ_spsr        fiq_regs[7]

struct kvm_regs {
        struct pt_regs usr_regs;        /* R0_usr - R14_usr, PC, CPSR */
        unsigned long svc_regs[3];      /* SP_svc, LR_svc, SPSR_svc */
        unsigned long abt_regs[3];      /* SP_abt, LR_abt, SPSR_abt */
        unsigned long und_regs[3];      /* SP_und, LR_und, SPSR_und */
        unsigned long irq_regs[3];      /* SP_irq, LR_irq, SPSR_irq */
        unsigned long fiq_regs[8];      /* R8_fiq - R14_fiq, SPSR_fiq */
};

/* Supported Processor Types */
#define KVM_ARM_TARGET_CORTEX_A15       0
#define KVM_ARM_TARGET_CORTEX_A7        1
#define KVM_ARM_NUM_TARGETS             2

/* 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_ITS_ADDR_TYPE          4
#define KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION     5

#define KVM_VGIC_V3_DIST_SIZE           SZ_64K
#define KVM_VGIC_V3_REDIST_SIZE         (2 * SZ_64K)
#define KVM_VGIC_V3_ITS_SIZE            (2 * SZ_64K)

#define KVM_ARM_VCPU_POWER_OFF          0 /* CPU is started in OFF state */
#define KVM_ARM_VCPU_PSCI_0_2           1 /* CPU uses PSCI v0.2 */

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

struct kvm_sregs {
};

struct kvm_fpu {
};

struct kvm_guest_debug_arch {
};

struct kvm_debug_exit_arch {
};

struct kvm_sync_regs {
        /* Used with KVM_CAP_ARM_USER_IRQ */
        __u64 device_irq_level;
};

struct kvm_arch_memory_slot {
};

/* for KVM_GET/SET_VCPU_EVENTS */
struct kvm_vcpu_events {
        struct {
                __u8 serror_pending;
                __u8 serror_has_esr;
                /* Align it to 8 bytes */
                __u8 pad[6];
                __u64 serror_esr;
        } exception;
        __u32 reserved[12];
};

/* 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
#define KVM_REG_ARM_32_OPC2_MASK        0x0000000000000007
#define KVM_REG_ARM_32_OPC2_SHIFT       0
#define KVM_REG_ARM_OPC1_MASK           0x0000000000000078
#define KVM_REG_ARM_OPC1_SHIFT          3
#define KVM_REG_ARM_CRM_MASK            0x0000000000000780
#define KVM_REG_ARM_CRM_SHIFT           7
#define KVM_REG_ARM_32_CRN_MASK         0x0000000000007800
#define KVM_REG_ARM_32_CRN_SHIFT        11
/*
 * For KVM currently all guest registers are nonsecure, but we reserve a bit
 * in the encoding to distinguish secure from nonsecure for AArch32 system
 * registers that are banked by security. This is 1 for the secure banked
 * register, and 0 for the nonsecure banked register or if the register is
 * not banked by security.
 */
#define KVM_REG_ARM_SECURE_MASK 0x0000000010000000
#define KVM_REG_ARM_SECURE_SHIFT        28

#define ARM_CP15_REG_SHIFT_MASK(x,n) \
        (((x) << KVM_REG_ARM_ ## n ## _SHIFT) & KVM_REG_ARM_ ## n ## _MASK)

#define __ARM_CP15_REG(op1,crn,crm,op2) \
        (KVM_REG_ARM | (15 << KVM_REG_ARM_COPROC_SHIFT) | \
        ARM_CP15_REG_SHIFT_MASK(op1, OPC1) | \
        ARM_CP15_REG_SHIFT_MASK(crn, 32_CRN) | \
        ARM_CP15_REG_SHIFT_MASK(crm, CRM) | \
        ARM_CP15_REG_SHIFT_MASK(op2, 32_OPC2))

#define ARM_CP15_REG32(...) (__ARM_CP15_REG(__VA_ARGS__) | KVM_REG_SIZE_U32)

#define __ARM_CP15_REG64(op1,crm) \
        (__ARM_CP15_REG(op1, 0, crm, 0) | KVM_REG_SIZE_U64)
#define ARM_CP15_REG64(...) __ARM_CP15_REG64(__VA_ARGS__)

/* PL1 Physical Timer Registers */
#define KVM_REG_ARM_PTIMER_CTL          ARM_CP15_REG32(0, 14, 2, 1)
#define KVM_REG_ARM_PTIMER_CNT          ARM_CP15_REG64(0, 14)
#define KVM_REG_ARM_PTIMER_CVAL         ARM_CP15_REG64(2, 14)

/* Virtual Timer Registers */
#define KVM_REG_ARM_TIMER_CTL           ARM_CP15_REG32(0, 14, 3, 1)
#define KVM_REG_ARM_TIMER_CNT           ARM_CP15_REG64(1, 14)
#define KVM_REG_ARM_TIMER_CVAL          ARM_CP15_REG64(3, 14)

/* 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) / 4)

/* 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

/* VFP registers: we could overload CP10 like ARM does, but that's ugly. */
#define KVM_REG_ARM_VFP                 (0x0012 << KVM_REG_ARM_COPROC_SHIFT)
#define KVM_REG_ARM_VFP_MASK            0x000000000000FFFF
#define KVM_REG_ARM_VFP_BASE_REG        0x0
#define KVM_REG_ARM_VFP_FPSID           0x1000
#define KVM_REG_ARM_VFP_FPSCR           0x1001
#define KVM_REG_ARM_VFP_MVFR1           0x1006
#define KVM_REG_ARM_VFP_MVFR0           0x1007
#define KVM_REG_ARM_VFP_FPEXC           0x1008
#define KVM_REG_ARM_VFP_FPINST          0x1009
#define KVM_REG_ARM_VFP_FPINST2         0x100A

/* KVM-as-firmware specific pseudo-registers */
#define KVM_REG_ARM_FW                  (0x0014 << KVM_REG_ARM_COPROC_SHIFT)
#define KVM_REG_ARM_FW_REG(r)           (KVM_REG_ARM | KVM_REG_SIZE_U64 | \
                                         KVM_REG_ARM_FW | ((r) & 0xffff))
#define KVM_REG_ARM_PSCI_VERSION        KVM_REG_ARM_FW_REG(0)

/* 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_V3_MPIDR_SHIFT 32
#define   KVM_DEV_ARM_VGIC_V3_MPIDR_MASK \
                        (0xffffffffULL << KVM_DEV_ARM_VGIC_V3_MPIDR_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_SYSREG_INSTR_MASK (0xffff)
#define KVM_DEV_ARM_VGIC_GRP_NR_IRQS    3
#define KVM_DEV_ARM_VGIC_GRP_CTRL       4
#define KVM_DEV_ARM_VGIC_GRP_REDIST_REGS 5
#define KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS 6
#define KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO  7
#define KVM_DEV_ARM_VGIC_GRP_ITS_REGS   8
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT  10
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK \
                        (0x3fffffULL << KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT)
#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK 0x3ff
#define VGIC_LEVEL_INFO_LINE_LEVEL      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
#define KVM_ARM_VCPU_TIMER_CTRL         1
#define   KVM_ARM_VCPU_TIMER_IRQ_VTIMER         0
#define   KVM_ARM_VCPU_TIMER_IRQ_PTIMER         1

#define   KVM_DEV_ARM_VGIC_CTRL_INIT            0
#define   KVM_DEV_ARM_ITS_SAVE_TABLES           1
#define   KVM_DEV_ARM_ITS_RESTORE_TABLES        2
#define   KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES  3
#define   KVM_DEV_ARM_ITS_CTRL_RESET            4

/* 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.
 */
#define KVM_ARM_IRQ_GIC_MAX             127

/* 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 /* __ARM_KVM_H__ */