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/i386/include/pcpu.h

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    1 /*-
    2  * Copyright (c) Peter Wemm
    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  * $FreeBSD: releng/7.3/sys/i386/include/pcpu.h 182202 2008-08-26 17:48:10Z jhb $
   27  */
   28 
   29 #ifndef _MACHINE_PCPU_H_
   30 #define _MACHINE_PCPU_H_
   31 
   32 #ifndef _SYS_CDEFS_H_
   33 #error "sys/cdefs.h is a prerequisite for this file"
   34 #endif
   35 
   36 #include <machine/segments.h>
   37 #include <machine/tss.h>
   38 
   39 /*
   40  * The SMP parts are setup in pmap.c and locore.s for the BSP, and
   41  * mp_machdep.c sets up the data for the AP's to "see" when they awake.
   42  * The reason for doing it via a struct is so that an array of pointers
   43  * to each CPU's data can be set up for things like "check curproc on all
   44  * other processors"
   45  */
   46 #define PCPU_MD_FIELDS                                                  \
   47         struct  pcpu *pc_prvspace;      /* Self-reference */            \
   48         struct  pmap *pc_curpmap;                                       \
   49         struct  i386tss pc_common_tss;                                  \
   50         struct  segment_descriptor pc_common_tssd;                      \
   51         struct  segment_descriptor *pc_tss_gdt;                         \
   52         struct  segment_descriptor *pc_fsgs_gdt;                        \
   53         int     pc_currentldt;                                          \
   54         u_int   pc_acpi_id;             /* ACPI CPU id */               \
   55         u_int   pc_apic_id;                                             \
   56         int     pc_private_tss          /* Flag indicating private tss */
   57 
   58 
   59 #ifdef _KERNEL
   60 
   61 #ifdef lint
   62 
   63 extern struct pcpu *pcpup;
   64 
   65 #define PCPU_GET(member)        (pcpup->pc_ ## member)
   66 #define PCPU_ADD(member, val)   (pcpu->pc_ ## member += (val))
   67 #define PCPU_INC(member)        PCPU_ADD(member, 1)
   68 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
   69 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
   70 
   71 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
   72 
   73 /*
   74  * Evaluates to the byte offset of the per-cpu variable name.
   75  */
   76 #define __pcpu_offset(name)                                             \
   77         __offsetof(struct pcpu, name)
   78 
   79 /*
   80  * Evaluates to the type of the per-cpu variable name.
   81  */
   82 #define __pcpu_type(name)                                               \
   83         __typeof(((struct pcpu *)0)->name)
   84 
   85 /*
   86  * Evaluates to the address of the per-cpu variable name.
   87  */
   88 #define __PCPU_PTR(name) __extension__ ({                               \
   89         __pcpu_type(name) *__p;                                         \
   90                                                                         \
   91         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
   92             : "=r" (__p)                                                \
   93             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
   94               "i" (__pcpu_offset(name)));                               \
   95                                                                         \
   96         __p;                                                            \
   97 })
   98 
   99 /*
  100  * Evaluates to the value of the per-cpu variable name.
  101  */
  102 #define __PCPU_GET(name) __extension__ ({                               \
  103         __pcpu_type(name) __res;                                        \
  104         struct __s {                                                    \
  105                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 4)];         \
  106         } __s;                                                          \
  107                                                                         \
  108         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
  109             sizeof(__res) == 4) {                                       \
  110                 __asm __volatile("mov %%fs:%1,%0"                       \
  111                     : "=r" (__s)                                        \
  112                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
  113                 *(struct __s *)(void *)&__res = __s;                    \
  114         } else {                                                        \
  115                 __res = *__PCPU_PTR(name);                              \
  116         }                                                               \
  117         __res;                                                          \
  118 })
  119 
  120 /*
  121  * Adds a value of the per-cpu counter name.  The implementation
  122  * must be atomic with respect to interrupts.
  123  */
  124 #define __PCPU_ADD(name, val) do {                                      \
  125         __pcpu_type(name) __val;                                        \
  126         struct __s {                                                    \
  127                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 4)];         \
  128         } __s;                                                          \
  129                                                                         \
  130         __val = (val);                                                  \
  131         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  132             sizeof(__val) == 4) {                                       \
  133                 __s = *(struct __s *)(void *)&__val;                    \
  134                 __asm __volatile("add %1,%%fs:%0"                       \
  135                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  136                     : "r" (__s));                                       \
  137         } else                                                          \
  138                 *__PCPU_PTR(name) += __val;                             \
  139 } while (0)
  140 
  141 /*
  142  * Increments the value of the per-cpu counter name.  The implementation
  143  * must be atomic with respect to interrupts.
  144  */
  145 #define __PCPU_INC(name) do {                                           \
  146         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
  147             sizeof(__pcpu_type(name)) == 2 ||                           \
  148             sizeof(__pcpu_type(name)) == 4);                            \
  149         if (sizeof(__pcpu_type(name)) == 1) {                           \
  150                 __asm __volatile("incb %%fs:%0"                         \
  151                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  152                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  153         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
  154                 __asm __volatile("incw %%fs:%0"                         \
  155                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  156                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  157         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
  158                 __asm __volatile("incl %%fs:%0"                         \
  159                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  160                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  161         }                                                               \
  162 } while (0)
  163 
  164 /*
  165  * Sets the value of the per-cpu variable name to value val.
  166  */
  167 #define __PCPU_SET(name, val) {                                         \
  168         __pcpu_type(name) __val;                                        \
  169         struct __s {                                                    \
  170                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 4)];         \
  171         } __s;                                                          \
  172                                                                         \
  173         __val = (val);                                                  \
  174         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  175             sizeof(__val) == 4) {                                       \
  176                 __s = *(struct __s *)(void *)&__val;                    \
  177                 __asm __volatile("mov %1,%%fs:%0"                       \
  178                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  179                     : "r" (__s));                                       \
  180         } else {                                                        \
  181                 *__PCPU_PTR(name) = __val;                              \
  182         }                                                               \
  183 }
  184 
  185 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
  186 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
  187 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
  188 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
  189 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
  190 
  191 static __inline struct thread *
  192 __curthread(void)
  193 {
  194         struct thread *td;
  195 
  196         __asm __volatile("movl %%fs:0,%0" : "=r" (td));
  197         return (td);
  198 }
  199 #define curthread               (__curthread())
  200 
  201 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
  202 
  203 #error "this file needs to be ported to your compiler"
  204 
  205 #endif /* lint, etc. */
  206 
  207 #endif /* _KERNEL */
  208 
  209 #endif /* !_MACHINE_PCPU_H_ */

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