The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/Osd/OsdSchedule.c

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    1 /*-
    2  * Copyright (c) 2000 Michael Smith
    3  * Copyright (c) 2000 BSDi
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: src/sys/dev/acpica/Osd/OsdSchedule.c,v 1.28 2004/05/06 02:18:58 njl Exp $
   28  */
   29 
   30 /*
   31  * 6.3 : Scheduling services
   32  */
   33 
   34 #include "opt_acpi.h"
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/interrupt.h>
   39 #include <sys/kernel.h>
   40 #include <sys/kthread.h>
   41 #include <sys/malloc.h>
   42 #include <sys/proc.h>
   43 #include <sys/msgport.h>
   44 #include <sys/taskqueue.h>
   45 #include <machine/clock.h>
   46 
   47 #include <sys/thread2.h>
   48 #include <sys/msgport2.h>
   49 #include <sys/mplock2.h>
   50 
   51 #include "acpi.h"
   52 #include "accommon.h"
   53 #include <dev/acpica/acpivar.h>
   54 
   55 #define _COMPONENT      ACPI_OS_SERVICES
   56 ACPI_MODULE_NAME("SCHEDULE")
   57 
   58 /*
   59  * This is a little complicated due to the fact that we need to build and then
   60  * free a 'struct task' for each task we enqueue.
   61  */
   62 
   63 MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task");
   64 
   65 static void     acpi_task_thread(void *arg);
   66 static void     acpi_autofree_reply(lwkt_port_t port, lwkt_msg_t msg);
   67 
   68 struct acpi_task {
   69     struct lwkt_msg             at_msg;
   70     ACPI_OSD_EXEC_CALLBACK      at_function;
   71     void                        *at_context;
   72     ACPI_EXECUTE_TYPE           at_type;
   73 };
   74 
   75 static struct thread *acpi_task_td;
   76 struct lwkt_port acpi_afree_rport;
   77 
   78 /*
   79  * Initialize the ACPI helper thread.
   80  */
   81 int
   82 acpi_task_thread_init(void)
   83 {
   84     lwkt_initport_replyonly(&acpi_afree_rport, acpi_autofree_reply);
   85     kthread_create(acpi_task_thread, NULL, &acpi_task_td, "acpi_task");
   86     return (0);
   87 }
   88 
   89 /*
   90  * The ACPI helper thread processes OSD execution callback messages.
   91  */
   92 static void
   93 acpi_task_thread(void *arg)
   94 {
   95     ACPI_OSD_EXEC_CALLBACK func;
   96     struct acpi_task *at;
   97 
   98     get_mplock();
   99     for (;;) {
  100         at = (void *)lwkt_waitport(&curthread->td_msgport, 0);
  101         func = at->at_function;
  102         func(at->at_context);
  103         lwkt_replymsg(&at->at_msg, 0);
  104     }
  105     rel_mplock();
  106 }
  107 
  108 /*
  109  * Queue an ACPI message for execution by allocating a LWKT message structure
  110  * and sending the message to the helper thread.  The reply port is setup
  111  * to automatically free the message.
  112  */
  113 ACPI_STATUS
  114 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function,
  115               void *Context)
  116 {
  117     struct acpi_task    *at;
  118 
  119     switch (Type) {
  120     case OSL_GLOBAL_LOCK_HANDLER:
  121     case OSL_NOTIFY_HANDLER:
  122     case OSL_GPE_HANDLER:
  123     case OSL_DEBUGGER_THREAD:
  124     case OSL_EC_POLL_HANDLER:
  125     case OSL_EC_BURST_HANDLER:
  126         break;
  127     default:
  128         return_ACPI_STATUS (AE_BAD_PARAMETER);
  129     }
  130 
  131     /* Note: Interrupt Context */
  132     at = kmalloc(sizeof(*at), M_ACPITASK, M_INTWAIT | M_ZERO);
  133     lwkt_initmsg(&at->at_msg, &acpi_afree_rport, 0);
  134     at->at_function = Function;
  135     at->at_context = Context;
  136     at->at_type = Type;
  137     lwkt_sendmsg(&acpi_task_td->td_msgport, &at->at_msg);
  138     return_ACPI_STATUS (AE_OK);
  139 }
  140 
  141 /*
  142  * The message's reply port just frees the message.
  143  */
  144 static void
  145 acpi_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
  146 {
  147     kfree(msg, M_ACPITASK);
  148 }
  149 
  150 UINT64
  151 AcpiOsGetTimer (void)
  152 {
  153     struct timeval  time;
  154 
  155     microtime(&time);
  156 
  157     /* Seconds * 10^7 = 100ns(10^-7), Microseconds(10^-6) * 10^1 = 100ns */
  158 
  159     return (((UINT64) time.tv_sec * 10000000) + ((UINT64) time.tv_usec * 10));
  160 }
  161 
  162 void
  163 AcpiOsSleep(ACPI_INTEGER Milliseconds)
  164 {
  165     int         timo;
  166     static int  dummy;
  167 
  168     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  169 
  170     timo = Milliseconds * hz / 1000;
  171 
  172     /* 
  173      * If requested sleep time is less than our hz resolution, or if
  174      * the system is in early boot before the system tick is operational,
  175      * use DELAY instead for better granularity.
  176      */
  177     if (clocks_running == 0) {
  178         while (timo > 1000000) {
  179             DELAY(1000000);
  180             timo -= 1000000;
  181         }
  182         if (timo)
  183             DELAY(timo * 1000);
  184     } else if (timo > 0) {
  185         tsleep(&dummy, 0, "acpislp", timo);
  186     } else {
  187         DELAY(Milliseconds * 1000);
  188     }
  189     return_VOID;
  190 }
  191 
  192 void
  193 AcpiOsStall(UINT32 Microseconds)
  194 {
  195     ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  196 
  197     DELAY(Microseconds);
  198     return_VOID;
  199 }
  200 
  201 ACPI_THREAD_ID
  202 AcpiOsGetThreadId(void)
  203 {
  204     struct proc *p;
  205 
  206     /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */
  207 
  208     p = curproc;
  209     if (p == NULL)
  210         p = &proc0;
  211     KASSERT(p != NULL, ("%s: curproc is NULL!", __func__));
  212 
  213     /* Returning 0 is not allowed. */
  214     return (p->p_pid + 1);
  215 }

Cache object: 386ddb2b9aabc706992efbf6ad9c97e3


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