/* $NetBSD: cpu.h,v 1.13.4.2 2020/02/12 19:55:57 martin Exp $ */

/*-
 * Copyright (c) 2014 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matt Thomas of 3am Software Foundry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _AARCH64_CPU_H_
#define _AARCH64_CPU_H_

#ifdef __aarch64__

#ifdef _KERNEL_OPT
#include "opt_multiprocessor.h"
#endif

#include <sys/param.h>

#if defined(_KERNEL) || defined(_KMEMUSER)
#include <sys/evcnt.h>

#include <aarch64/frame.h>
#include <aarch64/armreg.h>

struct clockframe {
	struct trapframe cf_tf;
};

/* (spsr & 15) == SPSR_M_EL0T(64bit,0) or USER(32bit,0) */
#define CLKF_USERMODE(cf)	((((cf)->cf_tf.tf_spsr) & 0x0f) == 0)
#define CLKF_PC(cf)		((cf)->cf_tf.tf_pc)
#define CLKF_INTR(cf)		((void)(cf), curcpu()->ci_intr_depth > 1)

/*
 * LWP_PC: Find out the program counter for the given lwp.
 */
#define LWP_PC(l)		((l)->l_md.md_utf->tf_pc)

#include <sys/cpu_data.h>
#include <sys/device_if.h>
#include <sys/intr.h>

struct aarch64_cpufuncs {
	void (*cf_set_ttbr0)(uint64_t);
};

struct cpu_info {
	struct cpu_data ci_data;
	device_t ci_dev;
	cpuid_t ci_cpuid;
	struct lwp *ci_curlwp;
	struct lwp *ci_softlwps[SOFTINT_COUNT];

	uint64_t ci_lastintr;

	int ci_mtx_oldspl;
	int ci_mtx_count;

	int ci_want_resched;
	int ci_cpl;
	volatile u_int ci_softints;
	volatile u_int ci_astpending;
	volatile u_int ci_intr_depth;

	/* event counters */
	struct evcnt ci_vfp_use;
	struct evcnt ci_vfp_reuse;
	struct evcnt ci_vfp_save;
	struct evcnt ci_vfp_release;

	/* interrupt controller */
	u_int ci_gic_redist;	/* GICv3 redistributor index */
	uint64_t ci_gic_sgir;	/* GICv3 SGIR target */

	/* ACPI */
	uint64_t ci_acpiid;	/* ACPI Processor Unique ID */

	struct aarch64_sysctl_cpu_id ci_id;

	struct aarch64_cache_info *ci_cacheinfo;
	struct aarch64_cpufuncs ci_cpufuncs;

} __aligned(COHERENCY_UNIT);

static inline struct cpu_info *
curcpu(void)
{
	struct cpu_info *ci;
	__asm __volatile ("mrs %0, tpidr_el1" : "=r"(ci));
	return ci;
}
#define curlwp			(curcpu()->ci_curlwp)

#define setsoftast(ci)		atomic_or_uint(&(ci)->ci_astpending, __BIT(0))
#define cpu_signotify(l)	setsoftast((l)->l_cpu)

void cpu_set_curpri(int);
void cpu_proc_fork(struct proc *, struct proc *);
void cpu_need_proftick(struct lwp *l);
void cpu_boot_secondary_processors(void);
void cpu_mpstart(void);
void cpu_hatch(struct cpu_info *);

extern struct cpu_info *cpu_info[];
extern uint64_t cpu_mpidr[];		/* MULTIPROCESSOR */
bool cpu_hatched_p(u_int);		/* MULTIPROCESSOR */

#define CPU_INFO_ITERATOR	cpuid_t
#if defined(MULTIPROCESSOR) || defined(_MODULE)
#define cpu_number()		(curcpu()->ci_index)
#define CPU_IS_PRIMARY(ci)	((ci)->ci_index == 0)
#define CPU_INFO_FOREACH(cii, ci)					\
	cii = 0, ci = cpu_info[0];					\
	cii < (ncpu ? ncpu : 1) && (ci = cpu_info[cii]) != NULL;	\
	cii++
#else /* MULTIPROCESSOR */
#define cpu_number()		0
#define CPU_IS_PRIMARY(ci)	true
#define CPU_INFO_FOREACH(cii, ci)					\
	cii = 0, __USE(cii), ci = curcpu(); ci != NULL; ci = NULL
#endif /* MULTIPROCESSOR */


static inline void
cpu_dosoftints(void)
{
#if defined(__HAVE_FAST_SOFTINTS) && !defined(__HAVE_PIC_FAST_SOFTINTS)
	void dosoftints(void);
	struct cpu_info * const ci = curcpu();

	if (ci->ci_intr_depth == 0 && (ci->ci_softints >> ci->ci_cpl) > 0)
		dosoftints();
#endif
}

static inline bool
cpu_intr_p(void)
{
#ifdef __HAVE_PIC_FAST_SOFTINTS
	if (ci->ci_cpl < IPL_VM)
		return false;
#endif
	return curcpu()->ci_intr_depth > 0;
}

void	cpu_attach(device_t, cpuid_t);

#endif /* _KERNEL || _KMEMUSER */

#elif defined(__arm__)

#include <arm/cpu.h>

#endif

#endif /* _AARCH64_CPU_H_ */