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      1 /*	$NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:13 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Klaus Klein.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _POWERPC_LWP_PRIVATE_H_
     33 #define _POWERPC_LWP_PRIVATE_H_
     34 
     35 #include <sys/cdefs.h>
     36 #include <sys/tls.h>
     37 
     38 #include <lwp.h>
     39 
     40 /*
     41  * On PowerPC, since displacements are signed 16-bit values, the TCB Pointer
     42  * is biased by 0x7000 + sizeof(tcb) so that first thread datum can be
     43  * addressed by -28672 thereby leaving 60KB available for use as thread data.
     44  */
     45 #define	TLS_TP_OFFSET	0x7000
     46 #define	TLS_DTV_OFFSET	0x8000
     47 __CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000);
     48 
     49 __BEGIN_DECLS
     50 
     51 static __inline void *
     52 __lwp_gettcb_fast(void)
     53 {
     54 	void *__tcb;
     55 
     56 	__asm __volatile(
     57 		"addi %[__tcb],%%r2,%[__offset]"
     58 	    :	[__tcb] "=r" (__tcb)
     59 	    :	[__offset] "n" (-(TLS_TP_OFFSET + sizeof(struct tls_tcb))));
     60 
     61 	return __tcb;
     62 }
     63 
     64 static __inline void
     65 __lwp_settcb(void *__tcb)
     66 {
     67 	__tcb = (uint8_t *)__tcb + TLS_TP_OFFSET + sizeof(struct tls_tcb);
     68 
     69 	__asm __volatile(
     70 		"mr %%r2,%[__tcb]"
     71 	    :
     72 	    :	[__tcb] "r" (__tcb));
     73 
     74 	_lwp_setprivate(__tcb);
     75 }
     76 
     77 __END_DECLS
     78 
     79 #endif	/* !_POWERPC_LWP_PRIVATE_H_ */
     80