pcpu.h

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    1 /*-
    2  * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  *      from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
   27  * $FreeBSD: releng/11.1/sys/arm/include/pcpu.h 314530 2017-03-02 01:18:46Z ian $
   28  */
   29 
   30 #ifndef _MACHINE_PCPU_H_
   31 #define _MACHINE_PCPU_H_
   32 
   33 #ifdef _KERNEL
   34 
   35 #include <sys/_lock.h>
   36 #include <sys/_mutex.h>
   37 
   38 #define ALT_STACK_SIZE  128
   39 
   40 struct vmspace;
   41 
   42 #endif  /* _KERNEL */
   43 
   44 #if __ARM_ARCH >= 6
   45 
   46 #define PCPU_MD_FIELDS                                                  \
   47         unsigned int pc_vfpsid;                                         \
   48         unsigned int pc_vfpmvfr0;                                       \
   49         unsigned int pc_vfpmvfr1;                                       \
   50         struct pmap *pc_curpmap;                                        \
   51         struct mtx pc_cmap_lock;                                        \
   52         void *pc_cmap1_pte2p;                                           \
   53         void *pc_cmap2_pte2p;                                           \
   54         caddr_t pc_cmap1_addr;                                          \
   55         caddr_t pc_cmap2_addr;                                          \
   56         vm_offset_t pc_qmap_addr;                                       \
   57         void *pc_qmap_pte2p;                                            \
   58         unsigned int pc_dbreg[32];                                      \
   59         int pc_dbreg_cmd;                                               \
   60         char __pad[19]
   61 #else
   62 #define PCPU_MD_FIELDS                                                  \
   63         char __pad[157]
   64 #endif
   65 
   66 #ifdef _KERNEL
   67 
   68 #define PC_DBREG_CMD_NONE       0
   69 #define PC_DBREG_CMD_LOAD       1
   70 
   71 struct pcb;
   72 struct pcpu;
   73 
   74 extern struct pcpu *pcpup;
   75 
   76 #if __ARM_ARCH >= 6
   77 #define CPU_MASK (0xf)
   78 
   79 #ifndef SMP
   80 #define get_pcpu() (pcpup)
   81 #else
   82 #define get_pcpu() __extension__ ({                                     \
   83         int id;                                                         \
   84         __asm __volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (id));      \
   85         (pcpup + (id & CPU_MASK));                                      \
   86     })
   87 #endif
   88 
   89 static inline struct thread *
   90 get_curthread(void)
   91 {
   92         void *ret;
   93 
   94         __asm __volatile("mrc p15, 0, %0, c13, c0, 4" : "=r" (ret));
   95         return (ret);
   96 }
   97 
   98 static inline void
   99 set_curthread(struct thread *td)
  100 {
  101 
  102         __asm __volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (td));
  103 }
  104 
  105 
  106 static inline void *
  107 get_tls(void)
  108 {
  109         void *tls;
  110 
  111         /* TPIDRURW contains the authoritative value. */
  112         __asm __volatile("mrc p15, 0, %0, c13, c0, 2" : "=r" (tls));
  113         return (tls);
  114 }
  115 
  116 static inline void
  117 set_tls(void *tls)
  118 {
  119 
  120         /*
  121          * Update both TPIDRURW and TPIDRURO. TPIDRURW needs to be written
  122          * first to ensure that a context switch between the two writes will
  123          * still give the desired result of updating both.
  124          */
  125         __asm __volatile(
  126             "mcr p15, 0, %0, c13, c0, 2\n"
  127             "mcr p15, 0, %0, c13, c0, 3\n"
  128              : : "r" (tls));
  129 }
  130 
  131 #define curthread get_curthread()
  132 
  133 #else
  134 #define get_pcpu()      pcpup
  135 #endif
  136 
  137 #define PCPU_GET(member)        (get_pcpu()->pc_ ## member)
  138 #define PCPU_ADD(member, value) (get_pcpu()->pc_ ## member += (value))
  139 #define PCPU_INC(member)        PCPU_ADD(member, 1)
  140 #define PCPU_PTR(member)        (&get_pcpu()->pc_ ## member)
  141 #define PCPU_SET(member,value)  (get_pcpu()->pc_ ## member = (value))
  142 
  143 void pcpu0_init(void);
  144 #endif  /* _KERNEL */
  145 
  146 #endif  /* !_MACHINE_PCPU_H_ */

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

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