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

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