/*      $NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:11 christos Exp $ */

/*-
* Copyright (c) 1999, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein, and by Jason R. Thorpe of Wasabi Systems, Inc.
*
* 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 _MIPS_LWP_PRIVATE_H_
#define _MIPS_LWP_PRIVATE_H_

#include <lwp.h>
#include <sys/cdefs.h>
#include <sys/tls.h>

#define TLS_TP_OFFSET   0x7000
#define TLS_DTV_OFFSET  0x8000

__CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000);
__CTASSERT(TLS_TP_OFFSET % sizeof(struct tls_tcb) == 0);

__BEGIN_DECLS

static __inline struct tls_tcb *
__lwp_gettcb_fast(void)
{
       struct tls_tcb *__tcb;

       /*
        * Only emit a rdhwr $3, $29 so the kernel can quickly emulate it.
        */
       __asm __volatile(
#if 1
               // For some reason the syscall is much faster than
               // emulating rdhwr $3,$29 on a CN50xx
               "addiu $2,$0,316; syscall; nop; move %[__tcb],$2"
#else
               ".set push"
               ";.set mips32r2"
               ";.p2align 4"
               ";ssnop"
               ";rdhwr $3,$29"
               ";ssnop"
               ";move %0,$3"
               ";.set pop"
#endif
           : [__tcb]"=r"(__tcb)
           :
           : "v0", "v1", "a3");
       return __tcb - (TLS_TP_OFFSET / sizeof(*__tcb) + 1);
}

void _lwp_setprivate(void *);

static inline void
__lwp_settcb(struct tls_tcb *__tcb)
{
       __tcb += TLS_TP_OFFSET / sizeof(*__tcb) + 1;
       _lwp_setprivate(__tcb);
}

__END_DECLS

#endif  /* _MIPS_LWP_PRIVATE_H_ */