/*      $NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:13 christos Exp $ */

/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein.
*
* 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 _POWERPC_LWP_PRIVATE_H_
#define _POWERPC_LWP_PRIVATE_H_

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

#include <lwp.h>

/*
* On PowerPC, since displacements are signed 16-bit values, the TCB Pointer
* is biased by 0x7000 + sizeof(tcb) so that first thread datum can be
* addressed by -28672 thereby leaving 60KB available for use as thread data.
*/
#define TLS_TP_OFFSET   0x7000
#define TLS_DTV_OFFSET  0x8000
__CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000);

__BEGIN_DECLS

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

       __asm __volatile(
               "addi %[__tcb],%%r2,%[__offset]"
           :   [__tcb] "=r" (__tcb)
           :   [__offset] "n" (-(TLS_TP_OFFSET + sizeof(struct tls_tcb))));

       return __tcb;
}

static __inline void
__lwp_settcb(void *__tcb)
{
       __tcb = (uint8_t *)__tcb + TLS_TP_OFFSET + sizeof(struct tls_tcb);

       __asm __volatile(
               "mr %%r2,%[__tcb]"
           :
           :   [__tcb] "r" (__tcb));

       _lwp_setprivate(__tcb);
}

__END_DECLS

#endif  /* !_POWERPC_LWP_PRIVATE_H_ */