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      1 /*	$NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:11 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1999, 2002 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, and by Jason R. Thorpe of Wasabi Systems, Inc.
      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 _MIPS_LWP_PRIVATE_H_
     33 #define	_MIPS_LWP_PRIVATE_H_
     34 
     35 #include <lwp.h>
     36 #include <sys/cdefs.h>
     37 #include <sys/tls.h>
     38 
     39 #define	TLS_TP_OFFSET	0x7000
     40 #define	TLS_DTV_OFFSET	0x8000
     41 
     42 __CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000);
     43 __CTASSERT(TLS_TP_OFFSET % sizeof(struct tls_tcb) == 0);
     44 
     45 __BEGIN_DECLS
     46 
     47 static __inline struct tls_tcb *
     48 __lwp_gettcb_fast(void)
     49 {
     50 	struct tls_tcb *__tcb;
     51 
     52 	/*
     53 	 * Only emit a rdhwr $3, $29 so the kernel can quickly emulate it.
     54 	 */
     55 	__asm __volatile(
     56 #if 1
     57 		// For some reason the syscall is much faster than
     58 		// emulating rdhwr $3,$29 on a CN50xx
     59 		"addiu $2,$0,316; syscall; nop; move %[__tcb],$2"
     60 #else
     61 		".set push"
     62 		";.set mips32r2"
     63 		";.p2align 4"
     64 		";ssnop"
     65 		";rdhwr $3,$29"
     66 		";ssnop"
     67 		";move %0,$3"
     68 		";.set pop"
     69 #endif
     70 	    : [__tcb]"=r"(__tcb)
     71 	    :
     72 	    : "v0", "v1", "a3");
     73 	return __tcb - (TLS_TP_OFFSET / sizeof(*__tcb) + 1);
     74 }
     75 
     76 void _lwp_setprivate(void *);
     77 
     78 static inline void
     79 __lwp_settcb(struct tls_tcb *__tcb)
     80 {
     81 	__tcb += TLS_TP_OFFSET / sizeof(*__tcb) + 1;
     82 	_lwp_setprivate(__tcb);
     83 }
     84 
     85 __END_DECLS
     86 
     87 #endif	/* _MIPS_LWP_PRIVATE_H_ */
     88