/* SPDX-License-Identifier: GPL-2.0 */
/*
 * AArch64 processor specific defines
 *
 * Copyright (C) 2018, Red Hat, Inc.
 */
#ifndef SELFTEST_KVM_PROCESSOR_H
#define SELFTEST_KVM_PROCESSOR_H

#include "kvm_util.h"
#include "ucall_common.h"

#include <linux/stringify.h>
#include <linux/types.h>
#include <asm/sysreg.h>


#define ARM64_CORE_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \
			   KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(x))

/*
 * KVM_ARM64_SYS_REG(sys_reg_id): Helper macro to convert
 * SYS_* register definitions in asm/sysreg.h to use in KVM
 * calls such as vcpu_get_reg() and vcpu_set_reg().
 */
#define KVM_ARM64_SYS_REG(sys_reg_id)			\
	ARM64_SYS_REG(sys_reg_Op0(sys_reg_id),		\
			sys_reg_Op1(sys_reg_id),	\
			sys_reg_CRn(sys_reg_id),	\
			sys_reg_CRm(sys_reg_id),	\
			sys_reg_Op2(sys_reg_id))

/*
 * Default MAIR
 *                  index   attribute
 * DEVICE_nGnRnE      0     0000:0000
 * DEVICE_nGnRE       1     0000:0100
 * DEVICE_GRE         2     0000:1100
 * NORMAL_NC          3     0100:0100
 * NORMAL             4     1111:1111
 * NORMAL_WT          5     1011:1011
 */

/* Linux doesn't use these memory types, so let's define them. */
#define MAIR_ATTR_DEVICE_GRE	UL(0x0c)
#define MAIR_ATTR_NORMAL_WT	UL(0xbb)

#define MT_DEVICE_nGnRnE	0
#define MT_DEVICE_nGnRE		1
#define MT_DEVICE_GRE		2
#define MT_NORMAL_NC		3
#define MT_NORMAL		4
#define MT_NORMAL_WT		5

#define DEFAULT_MAIR_EL1							\
	(MAIR_ATTRIDX(MAIR_ATTR_DEVICE_nGnRnE, MT_DEVICE_nGnRnE) |		\
	 MAIR_ATTRIDX(MAIR_ATTR_DEVICE_nGnRE, MT_DEVICE_nGnRE) |		\
	 MAIR_ATTRIDX(MAIR_ATTR_DEVICE_GRE, MT_DEVICE_GRE) |			\
	 MAIR_ATTRIDX(MAIR_ATTR_NORMAL_NC, MT_NORMAL_NC) |			\
	 MAIR_ATTRIDX(MAIR_ATTR_NORMAL, MT_NORMAL) |				\
	 MAIR_ATTRIDX(MAIR_ATTR_NORMAL_WT, MT_NORMAL_WT))

void aarch64_vcpu_setup(struct kvm_vcpu *vcpu, struct kvm_vcpu_init *init);
struct kvm_vcpu *aarch64_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
				  struct kvm_vcpu_init *init, void *guest_code);

struct ex_regs {
	u64 regs[31];
	u64 sp;
	u64 pc;
	u64 pstate;
};

#define VECTOR_NUM	16

enum {
	VECTOR_SYNC_CURRENT_SP0,
	VECTOR_IRQ_CURRENT_SP0,
	VECTOR_FIQ_CURRENT_SP0,
	VECTOR_ERROR_CURRENT_SP0,

	VECTOR_SYNC_CURRENT,
	VECTOR_IRQ_CURRENT,
	VECTOR_FIQ_CURRENT,
	VECTOR_ERROR_CURRENT,

	VECTOR_SYNC_LOWER_64,
	VECTOR_IRQ_LOWER_64,
	VECTOR_FIQ_LOWER_64,
	VECTOR_ERROR_LOWER_64,

	VECTOR_SYNC_LOWER_32,
	VECTOR_IRQ_LOWER_32,
	VECTOR_FIQ_LOWER_32,
	VECTOR_ERROR_LOWER_32,
};

#define VECTOR_IS_SYNC(v) ((v) == VECTOR_SYNC_CURRENT_SP0 || \
			   (v) == VECTOR_SYNC_CURRENT     || \
			   (v) == VECTOR_SYNC_LOWER_64    || \
			   (v) == VECTOR_SYNC_LOWER_32)

#define ESR_EC_NUM		64
#define ESR_EC_SHIFT		26
#define ESR_EC_MASK		(ESR_EC_NUM - 1)

#define ESR_EC_UNKNOWN		0x0
#define ESR_EC_SVC64		0x15
#define ESR_EC_IABT		0x21
#define ESR_EC_DABT		0x25
#define ESR_EC_HW_BP_CURRENT	0x31
#define ESR_EC_SSTEP_CURRENT	0x33
#define ESR_EC_WP_CURRENT	0x35
#define ESR_EC_BRK_INS		0x3c

/* Access flag */
#define PTE_AF			(1ULL << 10)

/* Access flag update enable/disable */
#define TCR_EL1_HA		(1ULL << 39)

void aarch64_get_supported_page_sizes(uint32_t ipa, uint32_t *ipa4k,
					uint32_t *ipa16k, uint32_t *ipa64k);

void vm_init_descriptor_tables(struct kvm_vm *vm);
void vcpu_init_descriptor_tables(struct kvm_vcpu *vcpu);

typedef void(*handler_fn)(struct ex_regs *);
void vm_install_exception_handler(struct kvm_vm *vm,
		int vector, handler_fn handler);
void vm_install_sync_handler(struct kvm_vm *vm,
		int vector, int ec, handler_fn handler);

uint64_t *virt_get_pte_hva(struct kvm_vm *vm, vm_vaddr_t gva);

static inline void cpu_relax(void)
{
	asm volatile("yield" ::: "memory");
}

#define isb()		asm volatile("isb" : : : "memory")
#define dsb(opt)	asm volatile("dsb " #opt : : : "memory")
#define dmb(opt)	asm volatile("dmb " #opt : : : "memory")

#define dma_wmb()	dmb(oshst)
#define __iowmb()	dma_wmb()

#define dma_rmb()	dmb(oshld)

#define __iormb(v)							\
({									\
	unsigned long tmp;						\
									\
	dma_rmb();							\
									\
	/*								\
	 * Courtesy of arch/arm64/include/asm/io.h:			\
	 * Create a dummy control dependency from the IO read to any	\
	 * later instructions. This ensures that a subsequent call	\
	 * to udelay() will be ordered due to the ISB in __delay().	\
	 */								\
	asm volatile("eor	%0, %1, %1\n"				\
		     "cbnz	%0, ."					\
		     : "=r" (tmp) : "r" ((unsigned long)(v))		\
		     : "memory");					\
})

static __always_inline void __raw_writel(u32 val, volatile void *addr)
{
	asm volatile("str %w0, [%1]" : : "rZ" (val), "r" (addr));
}

static __always_inline u32 __raw_readl(const volatile void *addr)
{
	u32 val;
	asm volatile("ldr %w0, [%1]" : "=r" (val) : "r" (addr));
	return val;
}

static __always_inline void __raw_writeq(u64 val, volatile void *addr)
{
	asm volatile("str %0, [%1]" : : "rZ" (val), "r" (addr));
}

static __always_inline u64 __raw_readq(const volatile void *addr)
{
	u64 val;
	asm volatile("ldr %0, [%1]" : "=r" (val) : "r" (addr));
	return val;
}

#define writel_relaxed(v,c)	((void)__raw_writel((__force u32)cpu_to_le32(v),(c)))
#define readl_relaxed(c)	({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; })
#define writeq_relaxed(v,c)	((void)__raw_writeq((__force u64)cpu_to_le64(v),(c)))
#define readq_relaxed(c)	({ u64 __r = le64_to_cpu((__force __le64)__raw_readq(c)); __r; })

#define writel(v,c)		({ __iowmb(); writel_relaxed((v),(c));})
#define readl(c)		({ u32 __v = readl_relaxed(c); __iormb(__v); __v; })
#define writeq(v,c)		({ __iowmb(); writeq_relaxed((v),(c));})
#define readq(c)		({ u64 __v = readq_relaxed(c); __iormb(__v); __v; })


static inline void local_irq_enable(void)
{
	asm volatile("msr daifclr, #3" : : : "memory");
}

static inline void local_irq_disable(void)
{
	asm volatile("msr daifset, #3" : : : "memory");
}

/**
 * struct arm_smccc_res - Result from SMC/HVC call
 * @a0-a3 result values from registers 0 to 3
 */
struct arm_smccc_res {
	unsigned long a0;
	unsigned long a1;
	unsigned long a2;
	unsigned long a3;
};

/**
 * smccc_hvc - Invoke a SMCCC function using the hvc conduit
 * @function_id: the SMCCC function to be called
 * @arg0-arg6: SMCCC function arguments, corresponding to registers x1-x7
 * @res: pointer to write the return values from registers x0-x3
 *
 */
void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
	       uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5,
	       uint64_t arg6, struct arm_smccc_res *res);

/**
 * smccc_smc - Invoke a SMCCC function using the smc conduit
 * @function_id: the SMCCC function to be called
 * @arg0-arg6: SMCCC function arguments, corresponding to registers x1-x7
 * @res: pointer to write the return values from registers x0-x3
 *
 */
void smccc_smc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
	       uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5,
	       uint64_t arg6, struct arm_smccc_res *res);

/* Execute a Wait For Interrupt instruction. */
void wfi(void);

#endif /* SELFTEST_KVM_PROCESSOR_H */
