/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
 * All rights reserved.
 *
 * 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 AUTHOR 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 AUTHOR 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.
 *
 *      from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
 */

#ifndef _MACHINE_PCPU_H_
#define _MACHINE_PCPU_H_

#ifdef _KERNEL

#include <sys/_lock.h>
#include <sys/_mutex.h>

struct vmspace;

#endif  /* _KERNEL */

/* Branch predictor hardening method */
#define PCPU_BP_HARDEN_KIND_NONE                0
#define PCPU_BP_HARDEN_KIND_BPIALL              1
#define PCPU_BP_HARDEN_KIND_ICIALLU             2

#define PCPU_MD_FIELDS                                                  \
        unsigned int pc_vfpsid;                                         \
        unsigned int pc_vfpmvfr0;                                       \
        unsigned int pc_vfpmvfr1;                                       \
        struct pmap *pc_curpmap;                                        \
        struct mtx pc_cmap_lock;                                        \
        void *pc_cmap1_pte2p;                                           \
        void *pc_cmap2_pte2p;                                           \
        caddr_t pc_cmap1_addr;                                          \
        caddr_t pc_cmap2_addr;                                          \
        vm_offset_t pc_qmap_addr;                                       \
        void *pc_qmap_pte2p;                                            \
        unsigned int pc_dbreg[32];                                      \
        int pc_dbreg_cmd;                                               \
        int pc_bp_harden_kind;                                          \
        uint32_t pc_original_actlr;                                     \
        uint64_t pc_clock;                                              \
        uint32_t pc_mpidr;                                              \
        char __pad[135]

#ifdef _KERNEL

#define PC_DBREG_CMD_NONE       0
#define PC_DBREG_CMD_LOAD       1

struct pcb;
struct pcpu;

extern struct pcpu *pcpup;

#define CPU_MASK (0xf)

#ifndef SMP
#define get_pcpu() (pcpup)
#else
#define get_pcpu() __extension__ ({                                     \
        int id;                                                         \
        __asm __volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (id));      \
        (pcpup + (id & CPU_MASK));                                      \
    })
#endif

static inline struct thread *
get_curthread(void)
{
        void *ret;

        __asm __volatile("mrc p15, 0, %0, c13, c0, 4" : "=r" (ret));
        return (ret);
}

static inline void
set_curthread(struct thread *td)
{

        __asm __volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (td));
}

static inline void *
get_tls(void)
{
        void *tls;

        /* TPIDRURW contains the authoritative value. */
        __asm __volatile("mrc p15, 0, %0, c13, c0, 2" : "=r" (tls));
        return (tls);
}

static inline void
set_tls(void *tls)
{

        /*
         * Update both TPIDRURW and TPIDRURO. TPIDRURW needs to be written
         * first to ensure that a context switch between the two writes will
         * still give the desired result of updating both.
         */
        __asm __volatile(
            "mcr p15, 0, %0, c13, c0, 2\n"
            "mcr p15, 0, %0, c13, c0, 3\n"
             : : "r" (tls));
}

#define curthread get_curthread()


#define PCPU_GET(member)        (get_pcpu()->pc_ ## member)
#define PCPU_ADD(member, value) (get_pcpu()->pc_ ## member += (value))
#define PCPU_PTR(member)        (&get_pcpu()->pc_ ## member)
#define PCPU_SET(member,value)  (get_pcpu()->pc_ ## member = (value))

#define PCPU_GET_MPIDR(pc)      ((pc)->pc_mpidr)

void pcpu0_init(void);
#endif  /* _KERNEL */

#endif  /* !_MACHINE_PCPU_H_ */