1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 * 25 * Copyright 2020 Joyent, Inc. 26 */ 27 28 #ifndef _HPET_H 29 #define _HPET_H 30 31 #include <sys/hpet_acpi.h> 32 33 /* 34 * Interface for HPET access. 35 */ 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 /* 42 * HPET_INFINITY is used for timers that will never expire. 43 */ 44 #define HPET_INFINITY (INT64_MAX) 45 46 /* 47 * State of initialization. 48 */ 49 #define HPET_NO_SUPPORT (0) 50 #define HPET_TIMER_SUPPORT (1) /* supports main counter reads */ 51 #define HPET_INTERRUPT_SUPPORT (2) /* supports interrupt/timer */ 52 #define HPET_FULL_SUPPORT (3) /* supports counter and timer intr */ 53 54 typedef struct hpet { 55 uint_t supported; 56 boolean_t (*install_proxy)(void); 57 boolean_t (*callback)(int); 58 /* 59 * Next two function pointers allow CPUs to use the HPET's timer 60 * as a proxy for their LAPIC timers which stop during Deep C-State. 61 */ 62 boolean_t (*use_hpet_timer)(hrtime_t *); 63 void (*use_lapic_timer)(hrtime_t); 64 } hpet_t; 65 66 #define CST_EVENT_MULTIPLE_CSTATES (128) /* callbacks for _CST changes */ 67 #define CST_EVENT_ONE_CSTATE (129) 68 69 /* 70 * unix access to the HPET is done through the hpet structure. 71 */ 72 extern hpet_t hpet; 73 74 int hpet_early_init(void); 75 boolean_t hpet_timer_is_readable(void); 76 uint64_t hpet_read_timer(void); 77 int hpet_acpi_init(int *hpet_vect, iflag_t *hpet_flags, hrtime_t (*)(void), 78 void (*)(hrtime_t)); 79 void hpet_acpi_fini(void); 80 uint32_t hpet_proxy_ipl(void); 81 82 #ifdef __cplusplus 83 } 84 #endif 85 86 #endif /* _HPET_H */ 87