| 1 | /* $NetBSD: pcu.h,v 1.12 2014/05/16 00:48:41 rmind 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) |
| 54 | * Tells MD code to save the current CPU's state into the given |
| 55 | * LWP's MD storage. |
| 56 | * |
| 57 | * pcu_state_load(lwp, flags) |
| 58 | * Tells MD code to load PCU state from the given LWP's MD storage |
| 59 | * to the current CPU. |
| 60 | * |
| 61 | * pcu_state_release(lwp) |
| 62 | * Tells MD code detect the next use of the PCU on the LWP and |
| 63 | * call pcu_load(). |
| 64 | */ |
| 65 | |
| 66 | typedef struct { |
| 67 | u_int pcu_id; |
| 68 | void (*pcu_state_save)(lwp_t *); |
| 69 | void (*pcu_state_load)(lwp_t *, unsigned); |
| 70 | void (*pcu_state_release)(lwp_t *); |
| 71 | } pcu_ops_t; |
| 72 | |
| 73 | /* |
| 74 | * Flags for the pcu_state_load() operation. |
| 75 | */ |
| 76 | #define PCU_VALID 0x01 /* PCU state is considered valid */ |
| 77 | #define PCU_REENABLE 0x02 /* the state is present, re-enable PCU */ |
| 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 | bool pcu_valid_p(const pcu_ops_t *); |
| 88 | |
| 89 | #else |
| 90 | #define pcu_switchpoint(l) |
| 91 | #define pcu_discard_all(l) |
| 92 | #define pcu_save_all(l) |
| 93 | #endif |
| 94 | |
| 95 | #endif |
| 96 | |