/* * Copyright (c) 2004-2012 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ /* * @APPLE_FREE_COPYRIGHT@ */ /* * File: rtclock_asm.h * Purpose: Assembly routines for handling the machine dependent * real-time clock. */ #ifndef _I386_RTCLOCK_H_ #define _I386_RTCLOCK_H_ #include <i386/pal_rtclock_asm.h> /* * Nanotime returned in %rax. * Computed from tsc based on the scale factor and an implicit 32 bit shift. * This code must match what _rtc_nanotime_read does in * machine_routines_asm.s. Failure to do so can * result in "weird" timing results. * * Uses: %rsi, %rdi, %rdx, %rcx */ #define NANOTIME \ movq %gs:CPU_NANOTIME,%rdi ; \ PAL_RTC_NANOTIME_READ_FAST() /* * Add 64-bit delta in register reg to timer pointed to by register treg. */ #define TIMER_UPDATE(treg,reg,offset) \ addq reg,(offset)+TIMER_ALL(treg) /* add timer */ /* * Add time delta to old timer and start new. * Uses: %rsi, %rdi, %rdx, %rcx, %rax */ #define TIMER_EVENT(old,new) \ NANOTIME /* %rax := nanosecs */ ; \ movq %rax,%rsi /* save timestamp */ ; \ movq %gs:CPU_ACTIVE_THREAD,%rcx /* get thread */ ; \ subq (old##_TIMER)+TIMER_TSTAMP(%rcx),%rax /* compute elapsed */; \ TIMER_UPDATE(%rcx,%rax,old##_TIMER) /* update timer */ ; \ leaq (new##_TIMER)(%rcx),%rcx /* point to new timer */ ; \ movq %rsi,TIMER_TSTAMP(%rcx) /* set timestamp */ ; \ movq %gs:CPU_PROCESSOR,%rdx /* get processor */ ; \ movq %rcx,THREAD_TIMER(%rdx) /* set current timer */ ; \ movq %rsi,%rax /* restore timestamp */ ; \ subq (old##_STATE)+TIMER_TSTAMP(%rdx),%rax /* compute elapsed */; \ TIMER_UPDATE(%rdx,%rax,old##_STATE) /* update timer */ ; \ leaq (new##_STATE)(%rdx),%rcx /* point to new state */ ; \ movq %rcx,CURRENT_STATE(%rdx) /* set current state */ ; \ movq %rsi,TIMER_TSTAMP(%rcx) /* set timestamp */ /* * Update time on user trap entry. * Uses: %rsi, %rdi, %rdx, %rcx, %rax */ #define TIME_TRAP_UENTRY TIMER_EVENT(USER,SYSTEM) /* * update time on user trap exit. * Uses: %rsi, %rdi, %rdx, %rcx, %rax */ #define TIME_TRAP_UEXIT TIMER_EVENT(SYSTEM,USER) /* * update time on interrupt entry. * Uses: %rsi, %rdi, %rdx, %rcx, %rax * Saves processor state info on stack. */ #define TIME_INT_ENTRY \ NANOTIME /* %rax := nanosecs */ ; \ movq %rax,%gs:CPU_INT_EVENT_TIME /* save in cpu data */ ; \ movq %rax,%rsi /* save timestamp */ ; \ movq %gs:CPU_PROCESSOR,%rdx /* get processor */ ; \ movq THREAD_TIMER(%rdx),%rcx /* get current timer */ ; \ subq TIMER_TSTAMP(%rcx),%rax /* compute elapsed */ ; \ TIMER_UPDATE(%rcx,%rax,0) /* update timer */ ; \ movq KERNEL_TIMER(%rdx),%rcx /* get kernel timer */ ; \ movq %rsi,TIMER_TSTAMP(%rcx) /* set timestamp */ ; \ movq %rsi,%rax /* restore timestamp */ ; \ movq CURRENT_STATE(%rdx),%rcx /* get current state */ ; \ pushq %rcx /* save state */ ; \ subq TIMER_TSTAMP(%rcx),%rax /* compute elapsed */ ; \ TIMER_UPDATE(%rcx,%rax,0) /* update timer */ ; \ leaq IDLE_STATE(%rdx),%rax /* get idle state */ ; \ cmpq %rax,%rcx /* compare current */ ; \ je 0f /* skip if equal */ ; \ leaq SYSTEM_STATE(%rdx),%rcx /* get system state */ ; \ movq %rcx,CURRENT_STATE(%rdx) /* set current state */ ; \ 0: movq %rsi,TIMER_TSTAMP(%rcx) /* set timestamp */ /* * update time on interrupt exit. * Uses: %rsi, %rdi, %rdx, %rcx, %rax * Restores processor state info from stack. */ #define TIME_INT_EXIT \ NANOTIME /* %rax := nanosecs */ ; \ movq %rax,%rsi /* save timestamp */ ; \ movq %gs:CPU_PROCESSOR,%rdx /* get processor */ ; \ movq KERNEL_TIMER(%rdx),%rcx /* get kernel timer */ ; \ subq TIMER_TSTAMP(%rcx),%rax /* compute elapsed */ ; \ TIMER_UPDATE(%rcx,%rax,0) /* update timer */ ; \ movq THREAD_TIMER(%rdx),%rcx /* interrupted timer */ ; \ movq %rsi,TIMER_TSTAMP(%rcx) /* set timestamp */ ; \ movq %rsi,%rax /* restore timestamp */ ; \ movq CURRENT_STATE(%rdx),%rcx /* get current state */ ; \ subq TIMER_TSTAMP(%rcx),%rax /* compute elapsed */ ; \ TIMER_UPDATE(%rcx,%rax,0) /* update timer */ ; \ popq %rcx /* restore state */ ; \ movq %rcx,CURRENT_STATE(%rdx) /* set current state */ ; \ movq %rsi,TIMER_TSTAMP(%rcx) /* set timestamp */ ; \ movq $0,%gs:CPU_INT_EVENT_TIME /* clear interrupt entry time */ /* * Check for vtimers for task. * task_reg is register pointing to current task * thread_reg is register pointing to current thread */ #define TASK_VTIMER_CHECK(task_reg,thread_reg) \ cmpl $0,TASK_VTIMERS(task_reg) ; \ jz 1f ; \ orl $(AST_BSD),%gs:CPU_PENDING_AST /* Set pending AST */ ; \ lock ; \ orl $(AST_BSD),TH_AST(thread_reg) /* Set thread AST */ ; \ 1: ; \ #endif /* _I386_RTCLOCK_H_ */