xref: /src/sys/arch/aarch64/include/cpu.h

/* $NetBSD: cpu.h,v 1.34.2.1 2021/06/17 04:46:16 thorpej Exp $ */

/*-
 * Copyright (c) 2014, 2020 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_

#include <arm/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/armreg.h>
#include <aarch64/frame.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);
	void (*cf_icache_sync_range)(vaddr_t, vsize_t);
};

struct cpu_info {
	struct cpu_data ci_data;
	device_t ci_dev;
	cpuid_t ci_cpuid;

	/*
	 * the following are in their own cache line, as they are stored to
	 * regularly by remote CPUs; when they were mixed with other fields
	 * we observed frequent cache misses.
	 */
	int ci_want_resched __aligned(COHERENCY_UNIT);
	/* XXX pending IPIs? */

	/*
	 * this is stored frequently, and is fetched by remote CPUs.
	 */
	struct lwp *ci_curlwp __aligned(COHERENCY_UNIT);
	struct lwp *ci_onproc;

	/*
	 * largely CPU-private.
	 */
	struct lwp *ci_softlwps[SOFTINT_COUNT] __aligned(COHERENCY_UNIT);

	uint64_t ci_lastintr;

	int ci_mtx_oldspl;
	int ci_mtx_count;

	int ci_cpl;		/* current processor level (spl) */
	int ci_hwpl;		/* current hardware priority */
	volatile u_int ci_softints;
	volatile u_int ci_intr_depth;

	int ci_kfpu_spl;

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

	/* FDT or similar supplied "cpu capacity" */
	uint32_t ci_capacity_dmips_mhz;

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

	/* ACPI */
	uint32_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);

#ifdef _KERNEL
static inline struct lwp * __attribute__ ((const))
aarch64_curlwp(void)
{
	struct lwp *l;
	__asm("mrs %0, tpidr_el1" : "=r"(l));
	return l;
}

/* forward declaration; defined in sys/lwp.h. */
static __inline struct cpu_info *lwp_getcpu(struct lwp *);

#define	curcpu()		(lwp_getcpu(aarch64_curlwp()))
#define	setsoftast(ci)		(cpu_signotify((ci)->ci_onproc))
#undef curlwp
#define	curlwp			(aarch64_curlwp())

static inline int
cpu_maxproc(void)
{
	/*
	 * the pmap uses PID for ASID.
	 */
	switch (__SHIFTOUT(reg_id_aa64mmfr0_el1_read(), ID_AA64MMFR0_EL1_ASIDBITS)) {
	case ID_AA64MMFR0_EL1_ASIDBITS_8BIT:
		return (1U << 8) - 1;
	case ID_AA64MMFR0_EL1_ASIDBITS_16BIT:
		return (1U << 16) - 1;
	default:
		return 0;
	}
}

void	cpu_signotify(struct lwp *l);
void	cpu_need_proftick(struct lwp *l);

void	cpu_hatch(struct cpu_info *);

extern struct cpu_info *cpu_info[];
extern struct cpu_info cpu_info_store[];

#define CPU_INFO_ITERATOR	int
#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 */

#define	LWP0_CPU_INFO	(&cpu_info_store[0])

#define	__HAVE_CPU_DOSOFTINTS_CI

static inline void
cpu_dosoftints_ci(struct cpu_info *ci)
{
#if defined(__HAVE_FAST_SOFTINTS) && !defined(__HAVE_PIC_FAST_SOFTINTS)
	void dosoftints(void);

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

static inline void
cpu_dosoftints(void)
{
#if defined(__HAVE_FAST_SOFTINTS) && !defined(__HAVE_PIC_FAST_SOFTINTS)
	cpu_dosoftints_ci(curcpu());
#endif
}


#endif /* _KERNEL */

#endif /* _KERNEL || _KMEMUSER */

#endif

#endif /* _AARCH64_CPU_H_ */