FreeBSD/Linux Kernel Cross Reference
sys/sys/pcpu.h

     /*-
      * Copyright (c) 2001 Wind River Systems, Inc.
      * All rights reserved.
      * Written by: John Baldwin <jhb@FreeBSD.org>
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the author nor the names of any co-contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/8.0/sys/sys/pcpu.h 196119 2009-08-12 10:32:20Z bz $
     */
    
    #ifndef _SYS_PCPU_H_
    #define _SYS_PCPU_H_
    
    #ifdef LOCORE
    #error "no assembler-serviceable parts inside"
    #endif
    
    #include <sys/queue.h>
    #include <sys/vmmeter.h>
    #include <sys/resource.h>
    #include <machine/pcpu.h>
    
    struct pcb;
    struct thread;
    
    /*
     * Define a set for pcpu data.
     * 
     * We don't use SET_DECLARE because it defines the set as 'a' when we
     * want 'aw'.  GCC considers uninitialized data in a seperate section
     * writable and there is no generic zero initializer that works for
     * structs and scalars.
     */
    extern uintptr_t *__start_set_pcpu;
    extern uintptr_t *__stop_set_pcpu;
    
    __asm__(
    #if defined(__arm__)
            ".section set_pcpu, \"aw\", %progbits\n"
    #else
            ".section set_pcpu, \"aw\", @progbits\n"
    #endif
            "\t.p2align " __XSTRING(CACHE_LINE_SHIFT) "\n"
            "\t.previous");
    
    /*
     * Array of dynamic pcpu base offsets.  Indexed by id.
     */
    extern uintptr_t dpcpu_off[];
    
    /*
     * Convenience defines.
     */
    #define DPCPU_START             (uintptr_t)&__start_set_pcpu
    #define DPCPU_STOP              (uintptr_t)&__stop_set_pcpu
    #define DPCPU_BYTES             (DPCPU_STOP - DPCPU_START)
    #define DPCPU_MODMIN            2048
    #define DPCPU_SIZE              roundup2(DPCPU_BYTES, PAGE_SIZE)
    #define DPCPU_MODSIZE           (DPCPU_SIZE - (DPCPU_BYTES - DPCPU_MODMIN))
    
    /*
     * Declaration and definition.
     */
    #define DPCPU_NAME(n)           pcpu_entry_##n
    #define DPCPU_DECLARE(t, n)     extern t DPCPU_NAME(n)
    #define DPCPU_DEFINE(t, n)      t DPCPU_NAME(n) __section("set_pcpu") __used
    
    /*
     * Accessors with a given base.
     */
    #define _DPCPU_PTR(b, n)                                                \
        (__typeof(DPCPU_NAME(n))*)((b) + (uintptr_t)&DPCPU_NAME(n))
    #define _DPCPU_GET(b, n)        (*_DPCPU_PTR(b, n))
    #define _DPCPU_SET(b, n, v)     (*_DPCPU_PTR(b, n) = v)
    
    /*
     * Accessors for the current cpu.
    */
   #define DPCPU_PTR(n)            _DPCPU_PTR(PCPU_GET(dynamic), n)
   #define DPCPU_GET(n)            (*DPCPU_PTR(n))
   #define DPCPU_SET(n, v)         (*DPCPU_PTR(n) = v)
   
   /*
    * Accessors for remote cpus.
    */
   #define DPCPU_ID_PTR(i, n)      _DPCPU_PTR(dpcpu_off[(i)], n)
   #define DPCPU_ID_GET(i, n)      (*DPCPU_ID_PTR(i, n))
   #define DPCPU_ID_SET(i, n, v)   (*DPCPU_ID_PTR(i, n) = v)
   
   /* 
    * XXXUPS remove as soon as we have per cpu variable
    * linker sets and  can define rm_queue in _rm_lock.h
   */
   struct rm_queue {
           struct rm_queue* volatile rmq_next;
           struct rm_queue* volatile rmq_prev;
   };
   
   #define PCPU_NAME_LEN (sizeof("CPU ") + sizeof(__XSTRING(MAXCPU) + 1))
   
   
   /*
    * This structure maps out the global data that needs to be kept on a
    * per-cpu basis.  The members are accessed via the PCPU_GET/SET/PTR
    * macros defined in <machine/pcpu.h>.  Machine dependent fields are
    * defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>.
    */
   struct pcpu {
           struct thread   *pc_curthread;          /* Current thread */
           struct thread   *pc_idlethread;         /* Idle thread */
           struct thread   *pc_fpcurthread;        /* Fp state owner */
           struct thread   *pc_deadthread;         /* Zombie thread or NULL */
           struct pcb      *pc_curpcb;             /* Current pcb */
           uint64_t        pc_switchtime;
           int             pc_switchticks;
           u_int           pc_cpuid;               /* This cpu number */
           cpumask_t       pc_cpumask;             /* This cpu mask */
           cpumask_t       pc_other_cpus;          /* Mask of all other cpus */
           SLIST_ENTRY(pcpu) pc_allcpu;
           struct lock_list_entry *pc_spinlocks;
   #ifdef KTR
           char            pc_name[PCPU_NAME_LEN]; /* String name for KTR. */
   #endif
           struct vmmeter  pc_cnt;                 /* VM stats counters */
           long            pc_cp_time[CPUSTATES];  /* statclock ticks */
           struct device   *pc_device;
           void            *pc_netisr;             /* netisr SWI cookie. */
   
           /* 
            * Stuff for read mostly lock
            * 
            * XXXUPS remove as soon as we have per cpu variable
            * linker sets.
            */
           struct rm_queue  pc_rm_queue; 
   
           /*
            * Dynamic per-cpu data area.
            */
           uintptr_t       pc_dynamic;
   
           /*
            * Keep MD fields last, so that CPU-specific variations on a
            * single architecture don't result in offset variations of
            * the machine-independent fields of the pcpu. Even though
            * the pcpu structure is private to the kernel, some ports
            * (e.g. lsof, part of gtop) define _KERNEL and include this
            * header. While strictly speaking this is wrong, there's no
            * reason not to keep the offsets of the MI fields contants.
            * If only to make kernel debugging easier...
            */
           PCPU_MD_FIELDS;
   } __aligned(128);
   
   #ifdef _KERNEL
   
   SLIST_HEAD(cpuhead, pcpu);
   
   extern struct cpuhead cpuhead;
   
   #define curcpu          PCPU_GET(cpuid)
   #define curproc         (curthread->td_proc)
   #ifndef curthread
   #define curthread       PCPU_GET(curthread)
   #endif
   #define curvidata       PCPU_GET(vidata)
   
   /*
    * Machine dependent callouts.  cpu_pcpu_init() is responsible for
    * initializing machine dependent fields of struct pcpu, and
    * db_show_mdpcpu() is responsible for handling machine dependent
    * fields for the DDB 'show pcpu' command.
    */
   
   extern struct pcpu *cpuid_to_pcpu[MAXCPU];
   
   
   void    cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
   void    db_show_mdpcpu(struct pcpu *pcpu);
   
   void    pcpu_destroy(struct pcpu *pcpu);
   struct  pcpu *pcpu_find(u_int cpuid);
   void    pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
   void    *dpcpu_alloc(int size);
   void    dpcpu_copy(void *s, int size);
   void    dpcpu_free(void *s, int size);
   void    dpcpu_init(void *dpcpu, int cpuid);
   
   #endif  /* _KERNEL */
   
   #endif /* !_SYS_PCPU_H_ */

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