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

     /*
      * Copyright (c) 2003-2011 The DragonFly Project.  All rights reserved.
      * 
      * This code is derived from software contributed to The DragonFly Project
      * by Matthew Dillon <dillon@backplane.com>
      * 
      * 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.
     * 3. Neither the name of The DragonFly Project nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific, prior written permission.
     * 
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
     * COPYRIGHT HOLDERS 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.
     * 
     * Copyright (c) Peter Wemm <peter@netplex.com.au> All rights reserved.
     *
     * 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.
     *
     * 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.
     */
    
    #ifndef _SYS_GLOBALDATA_H_
    #define _SYS_GLOBALDATA_H_
    
    #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
    
    #ifndef _SYS_STDINT_H_
    #include <sys/stdint.h> /* __int types */
    #endif
    #ifndef _SYS_TIME_H_
    #include <sys/time.h>   /* struct timeval */
    #endif
    #ifndef _SYS_VMMETER_H_
    #include <sys/vmmeter.h> /* struct vmmeter */
    #endif
    #ifndef _SYS_THREAD_H_
    #include <sys/thread.h> /* struct thread */
    #endif
    #ifndef _SYS_SLABALLOC_H_
    #include <sys/slaballoc.h> /* SLGlobalData */
    #endif
    #ifndef _SYS_SYSTIMER_H_
    #include <sys/systimer.h> /* fine-grained system timers */
    #endif
    #ifndef _SYS_NCHSTATS_H_
    #include <sys/nchstats.h>
    #endif
    #ifndef _SYS_SYSID_H_
    #include <sys/sysid.h>    /* sysid_t */
    #endif
    
    /*
     * This structure maps out the global data that needs to be kept on a
     * per-cpu basis.  genassym uses this to generate offsets for the assembler
     * code.  The machine-dependant portions of this file can be found in
     * <machine/globaldata.h>, but only MD code should retrieve it.
     *
     * The SMP parts are setup in pmap.c and locore.s for the BSP, and
     * mp_machdep.c sets up the data for the AP's to "see" when they awake.
     * The reason for doing it via a struct is so that an array of pointers
     * to each CPU's data can be set up for things like "check curproc on all
     * other processors"
     *
    * NOTE! this structure needs to remain compatible between module accessors
    * and the kernel, so we can't throw in lots of #ifdef's.
    *
    * gd_reqflags serves serveral purposes, but it is primarily an interrupt
    * rollup flag used by the task switcher and spl mechanisms to decide that
    * further checks are necessary.  Interrupts are typically managed on a
    * per-processor basis at least until you leave a critical section, but
    * may then be scheduled to other cpus.
    *
    * gd_vme_avail and gd_vme_base cache free vm_map_entry structures for use
    * in various vm_map related operations.  gd_vme_avail is *NOT* a count of
    * the number of structures in the cache but is instead a count of the number
    * of unreserved structures in the cache.  See vm_map_entry_reserve().
    */
   
   struct sysmsg;
   struct tslpentry;
   struct privatespace;
   struct vm_map_entry;
   struct spinlock;
   struct pipe;
   
   struct globaldata {
           struct privatespace *gd_prvspace;       /* self-reference */
           struct thread   *gd_curthread;
           struct thread   *gd_freetd;             /* cache one free td */
           __uint32_t      gd_reqflags;            /* (see note above) */
           long            gd_flags;
           lwkt_queue      gd_tdallq;              /* all threads */
           lwkt_queue      gd_tdrunq;              /* runnable threads */
           __uint32_t      gd_cpuid;
           cpumask_t       gd_cpumask;             /* mask = CPUMASK(cpuid) */
           cpumask_t       gd_other_cpus;          /* mask of 'other' cpus */
           struct timeval  gd_stattv;
           int             gd_intr_nesting_level;  /* hard code, intrs, ipis */
           struct vmmeter  gd_cnt;
           struct vmtotal  gd_vmtotal;
           cpumask_t       gd_ipimask;             /* pending ipis from cpus */
           struct lwkt_ipiq *gd_ipiq;              /* array[ncpu] of ipiq's */
           struct lwkt_ipiq gd_cpusyncq;           /* ipiq for cpu synchro */
           u_int           gd_npoll;               /* ipiq synchronization */
           int             gd_tdrunqcount;
           struct thread   gd_unused02B;
           struct thread   gd_idlethread;
           SLGlobalData    gd_slab;                /* slab allocator */
           int             gd_trap_nesting_level;  /* track traps */
           int             gd_vme_avail;           /* vm_map_entry reservation */
           struct vm_map_entry *gd_vme_base;       /* vm_map_entry reservation */
           struct systimerq gd_systimerq;          /* per-cpu system timers */
           int             gd_syst_nest;
           struct systimer gd_hardclock;           /* scheduler periodic */
           struct systimer gd_statclock;           /* statistics periodic */
           struct systimer gd_schedclock;          /* scheduler periodic */
           volatile __uint32_t gd_time_seconds;    /* uptime in seconds */
           volatile sysclock_t gd_cpuclock_base;   /* cpuclock relative base */
   
           struct pipe     *gd_pipeq;              /* cache pipe structures */
           struct nchstats *gd_nchstats;           /* namecache effectiveness */
           int             gd_pipeqcount;          /* number of structures */
           sysid_t         gd_sysid_alloc;         /* allocate unique sysid */
   
           struct tslpque  *gd_tsleep_hash;        /* tsleep/wakeup support */
           long            gd_processing_ipiq;
           int             gd_spinlocks;           /* Exclusive spinlocks held */
           struct systimer *gd_systimer_inprog;    /* in-progress systimer */
           int             gd_timer_running;
           u_int           gd_idle_repeat;         /* repeated switches to idle */
           int             gd_ireserved[7];
           const char      *gd_infomsg;            /* debugging */
           struct lwkt_tokref gd_handoff;          /* hand-off tokref */
           void            *gd_delayed_wakeup[2];
           void            *gd_sample_pc;          /* sample program ctr/tr */
           void            *gd_preserved[5];       /* future fields */
           /* extended by <machine/globaldata.h> */
   };
   
   typedef struct globaldata *globaldata_t;
   
   #define RQB_IPIQ                0       /* 0001 */
   #define RQB_INTPEND             1       /* 0002 */
   #define RQB_AST_OWEUPC          2       /* 0004 */
   #define RQB_AST_SIGNAL          3       /* 0008 */
   #define RQB_AST_USER_RESCHED    4       /* 0010 */
   #define RQB_AST_LWKT_RESCHED    5       /* 0020 */
   #define RQB_UNUSED6             6       /* 0040 */
   #define RQB_TIMER               7       /* 0080 */
   #define RQB_RUNNING             8       /* 0100 */
   #define RQB_SPINNING            9       /* 0200 */
   #define RQB_QUICKRET            10      /* 0400 */
   
   #define RQF_IPIQ                (1 << RQB_IPIQ)
   #define RQF_INTPEND             (1 << RQB_INTPEND)
   #define RQF_TIMER               (1 << RQB_TIMER)
   #define RQF_AST_OWEUPC          (1 << RQB_AST_OWEUPC)
   #define RQF_AST_SIGNAL          (1 << RQB_AST_SIGNAL)
   #define RQF_AST_USER_RESCHED    (1 << RQB_AST_USER_RESCHED)
   #define RQF_AST_LWKT_RESCHED    (1 << RQB_AST_LWKT_RESCHED)
   #define RQF_RUNNING             (1 << RQB_RUNNING)
   #define RQF_SPINNING            (1 << RQB_SPINNING)
   #define RQF_QUICKRET            (1 << RQB_QUICKRET)
   
   #define RQF_AST_MASK            (RQF_AST_OWEUPC|RQF_AST_SIGNAL|\
                                   RQF_AST_USER_RESCHED|RQF_AST_LWKT_RESCHED)
   #define RQF_IDLECHECK_MASK      (RQF_IPIQ|RQF_INTPEND|RQF_TIMER)
   #define RQF_IDLECHECK_WK_MASK   (RQF_IDLECHECK_MASK|RQF_AST_LWKT_RESCHED)
   
   /*
    * globaldata flags
    */
   #define GDF_KPRINTF             0x0001  /* kprintf() reentrancy */
   
   #endif
   
   /*
    * MANUAL DEBUG CODE FOR DEBUGGING LOCKUPS
    */
   #ifdef _KERNEL
   
   #if 0
   
   #define DEBUG_PUSH_INFO(msg)                            \
           const char *save_infomsg;                       \
           save_infomsg = mycpu->gd_infomsg;               \
           mycpu->gd_infomsg = msg                         \
   
   #define DEBUG_POP_INFO()        mycpu->gd_infomsg = save_infomsg
   
   #else
   
   #define DEBUG_PUSH_INFO(msg)
   #define DEBUG_POP_INFO()
   
   #endif
   
   #endif
   
   #ifdef _KERNEL
   struct globaldata *globaldata_find(int cpu);
   int is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr);
   #endif
   
   #endif

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