1 /* $NetBSD: pcu.h,v 1.11 2013/08/22 19:50:55 drochner Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Mindaugas Rasiukevicius. 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 _SYS_PCU_H_ 33 #define _SYS_PCU_H_ 34 35 #if !defined(_KERNEL) && !defined(_KMEMUSER) 36 #error "not supposed to be exposed to userland" 37 #endif 38 39 #ifndef _KERNEL 40 #include <stdbool.h> 41 #endif 42 43 /* 44 * Default: no PCU for MD. 45 */ 46 #ifndef PCU_UNIT_COUNT 47 #define PCU_UNIT_COUNT 0 48 #endif 49 50 #if PCU_UNIT_COUNT > 0 51 52 /* 53 * pcu_state_save(lwp, flags) 54 * save the current CPU's state into the given LWP's MD storage. 55 * 56 * pcu_state_load(lwp, flags) 57 * load PCU state from the given LWP's MD storage to the current CPU. 58 * the 'flags' argument contains PCU_LOADED if it isn't the first time 59 * the LWP has used the PCU. 60 * 61 * pcu_state_release(lwp, flags) 62 * tell MD code detect the next use of the PCU on the LWP, and call 63 * pcu_load(). 64 */ 65 66 typedef struct { 67 u_int pcu_id; 68 void (*pcu_state_save)(lwp_t *, u_int); 69 void (*pcu_state_load)(lwp_t *, u_int); 70 void (*pcu_state_release)(lwp_t *, u_int); 71 } pcu_ops_t; 72 73 #define PCU_USER 0x00 /* PCU state is for the user */ 74 #define PCU_KERNEL 0x01 /* PCU state is for the kernel */ 75 #define PCU_RELOAD 0x02 /* Load registers into the PCU, */ 76 #define PCU_ENABLE 0x04 /* Enable the PCU, */ 77 #define PCU_LOADED 0x08 /* LWP has used the PCU before, */ 78 79 void pcu_switchpoint(lwp_t *); 80 void pcu_discard_all(lwp_t *); 81 void pcu_save_all(lwp_t *); 82 83 void pcu_load(const pcu_ops_t *); 84 void pcu_save(const pcu_ops_t *); 85 void pcu_save_all_on_cpu(void); 86 void pcu_discard(const pcu_ops_t *, bool); 87 void pcu_kernel_acquire(const pcu_ops_t *); 88 void pcu_kernel_release(const pcu_ops_t *); 89 bool pcu_used_p(const pcu_ops_t *); 90 91 #else 92 #define pcu_switchpoint(l) 93 #define pcu_discard_all(l) 94 #define pcu_save_all(l) 95 #endif 96 97 #endif 98