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 26 #ifndef _HPET_H 27 #define _HPET_H 28 29 #include <sys/hpet_acpi.h> 30 31 /* 32 * Interface for HPET access. 33 */ 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 /* 40 * HPET_INFINITY is used for timers that will never expire. 41 */ 42 #define HPET_INFINITY (INT64_MAX) 43 44 /* 45 * State of initialization. 46 */ 47 #define HPET_NO_SUPPORT (0) 48 #define HPET_TIMER_SUPPORT (1) /* supports main counter reads */ 49 #define HPET_INTERRUPT_SUPPORT (2) /* supports interrupt/timer */ 50 #define HPET_FULL_SUPPORT (3) /* supports counter and timer intr */ 51 52 typedef struct hpet { 53 uint_t supported; 54 boolean_t (*install_proxy)(void); 55 boolean_t (*callback)(int); 56 /* 57 * Next two function pointers allow CPUs to use the HPET's timer 58 * as a proxy for their LAPIC timers which stop during Deep C-State. 59 */ 60 boolean_t (*use_hpet_timer)(hrtime_t *); 61 void (*use_lapic_timer)(hrtime_t); 62 } hpet_t; 63 64 #define CST_EVENT_MULTIPLE_CSTATES (128) /* callbacks for _CST changes */ 65 #define CST_EVENT_ONE_CSTATE (129) 66 67 /* 68 * unix access to the HPET is done through the hpet structure. 69 */ 70 extern hpet_t hpet; 71 72 int hpet_acpi_init(int *hpet_vect, iflag_t *hpet_flags); 73 void hpet_acpi_fini(void); 74 uint32_t hpet_proxy_ipl(void); 75 76 #ifdef __cplusplus 77 } 78 #endif 79 80 #endif /* _HPET_H */ 81