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      1 /* $NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:12 christos Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      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 #ifndef _OR1K_LWP_PRIVATE_H_
     32 #define _OR1K_LWP_PRIVATE_H_
     33 
     34 #include <sys/cdefs.h>
     35 #include <sys/tls.h>
     36 
     37 /*
     38  * On OpenRISC 1000, since displacements are signed 16-bit values, the TCB
     39  * Pointer is biased by 0x7000 + sizeof(tcb) so that first thread datum can be
     40  * addressed by -28672 thereby leaving 60KB available for use as thread data.
     41  */
     42 #define	TLS_TP_OFFSET	0x7000
     43 #define	TLS_DTV_OFFSET	0x8000
     44 __CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000);
     45 
     46 __BEGIN_DECLS
     47 
     48 static __inline void *
     49 __lwp_getprivate_fast(void)
     50 {
     51 	void *__tp;
     52 	__asm("l.ori %0,r10,0" : "=r"(__tp));
     53 	return __tp;
     54 }
     55 
     56 static __inline void *
     57 __lwp_gettcb_fast(void)
     58 {
     59 	void *__tcb;
     60 
     61 	__asm __volatile(
     62 		"l.addi %[__tcb],r10,%[__offset]"
     63 	    :	[__tcb] "=r" (__tcb)
     64 	    :	[__offset] "n" (-(TLS_TP_OFFSET + sizeof(struct tls_tcb))));
     65 
     66 	return __tcb;
     67 }
     68 
     69 static __inline void
     70 __lwp_settcb(void *__tcb)
     71 {
     72 	__asm __volatile(
     73 		"l.addi r10,%[__tcb],%[__offset]"
     74 	    :
     75 	    :	[__tcb] "r" (__tcb),
     76 		[__offset] "n" (TLS_TP_OFFSET + sizeof(struct tls_tcb)));
     77 }
     78 
     79 __END_DECLS
     80 
     81 #endif /* !_OR1K_LWP_PRIVATE_H_ */
     82