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/11.0/sys/i386/include/pcpu.h 286296 2015-08-04 19:46:13Z jah $
   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 
   47 #define PCPU_MD_FIELDS                                                  \
   48         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
   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         u_int   pc_cmci_mask;           /* MCx banks for CMCI */        \
   60         u_int   pc_vcpu_id;             /* Xen vCPU ID */               \
   61         vm_offset_t pc_qmap_addr;       /* KVA for temporary mappings */\
   62         char    __pad[229]
   63 
   64 #ifdef _KERNEL
   65 
   66 #ifdef lint
   67 
   68 extern struct pcpu *pcpup;
   69 
   70 #define PCPU_GET(member)        (pcpup->pc_ ## member)
   71 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
   72 #define PCPU_INC(member)        PCPU_ADD(member, 1)
   73 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
   74 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
   75 
   76 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
   77 
   78 /*
   79  * Evaluates to the byte offset of the per-cpu variable name.
   80  */
   81 #define __pcpu_offset(name)                                             \
   82         __offsetof(struct pcpu, name)
   83 
   84 /*
   85  * Evaluates to the type of the per-cpu variable name.
   86  */
   87 #define __pcpu_type(name)                                               \
   88         __typeof(((struct pcpu *)0)->name)
   89 
   90 /*
   91  * Evaluates to the address of the per-cpu variable name.
   92  */
   93 #define __PCPU_PTR(name) __extension__ ({                               \
   94         __pcpu_type(name) *__p;                                         \
   95                                                                         \
   96         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
   97             : "=r" (__p)                                                \
   98             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
   99               "i" (__pcpu_offset(name)));                               \
  100                                                                         \
  101         __p;                                                            \
  102 })
  103 
  104 /*
  105  * Evaluates to the value of the per-cpu variable name.
  106  */
  107 #define __PCPU_GET(name) __extension__ ({                               \
  108         __pcpu_type(name) __res;                                        \
  109         struct __s {                                                    \
  110                 u_char  __b[MIN(sizeof(__res), 4)];                     \
  111         } __s;                                                          \
  112                                                                         \
  113         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
  114             sizeof(__res) == 4) {                                       \
  115                 __asm __volatile("mov %%fs:%1,%0"                       \
  116                     : "=r" (__s)                                        \
  117                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
  118                 *(struct __s *)(void *)&__res = __s;                    \
  119         } else {                                                        \
  120                 __res = *__PCPU_PTR(name);                              \
  121         }                                                               \
  122         __res;                                                          \
  123 })
  124 
  125 /*
  126  * Adds a value of the per-cpu counter name.  The implementation
  127  * must be atomic with respect to interrupts.
  128  */
  129 #define __PCPU_ADD(name, val) do {                                      \
  130         __pcpu_type(name) __val;                                        \
  131         struct __s {                                                    \
  132                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  133         } __s;                                                          \
  134                                                                         \
  135         __val = (val);                                                  \
  136         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  137             sizeof(__val) == 4) {                                       \
  138                 __s = *(struct __s *)(void *)&__val;                    \
  139                 __asm __volatile("add %1,%%fs:%0"                       \
  140                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  141                     : "r" (__s));                                       \
  142         } else                                                          \
  143                 *__PCPU_PTR(name) += __val;                             \
  144 } while (0)
  145 
  146 /*
  147  * Increments the value of the per-cpu counter name.  The implementation
  148  * must be atomic with respect to interrupts.
  149  */
  150 #define __PCPU_INC(name) do {                                           \
  151         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
  152             sizeof(__pcpu_type(name)) == 2 ||                           \
  153             sizeof(__pcpu_type(name)) == 4);                            \
  154         if (sizeof(__pcpu_type(name)) == 1) {                           \
  155                 __asm __volatile("incb %%fs:%0"                         \
  156                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  157                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  158         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
  159                 __asm __volatile("incw %%fs:%0"                         \
  160                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  161                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  162         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
  163                 __asm __volatile("incl %%fs:%0"                         \
  164                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  165                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  166         }                                                               \
  167 } while (0)
  168 
  169 /*
  170  * Sets the value of the per-cpu variable name to value val.
  171  */
  172 #define __PCPU_SET(name, val) do {                                      \
  173         __pcpu_type(name) __val;                                        \
  174         struct __s {                                                    \
  175                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  176         } __s;                                                          \
  177                                                                         \
  178         __val = (val);                                                  \
  179         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  180             sizeof(__val) == 4) {                                       \
  181                 __s = *(struct __s *)(void *)&__val;                    \
  182                 __asm __volatile("mov %1,%%fs:%0"                       \
  183                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  184                     : "r" (__s));                                       \
  185         } else {                                                        \
  186                 *__PCPU_PTR(name) = __val;                              \
  187         }                                                               \
  188 } while (0)
  189 
  190 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
  191 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
  192 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
  193 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
  194 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
  195 
  196 #define OFFSETOF_CURTHREAD      0
  197 #ifdef __clang__
  198 #pragma clang diagnostic push
  199 #pragma clang diagnostic ignored "-Wnull-dereference"
  200 #endif
  201 static __inline __pure2 struct thread *
  202 __curthread(void)
  203 {
  204         struct thread *td;
  205 
  206         __asm("movl %%fs:%1,%0" : "=r" (td)
  207             : "m" (*(char *)OFFSETOF_CURTHREAD));
  208         return (td);
  209 }
  210 #ifdef __clang__
  211 #pragma clang diagnostic pop
  212 #endif
  213 #define curthread               (__curthread())
  214 
  215 #define OFFSETOF_CURPCB         16
  216 static __inline __pure2 struct pcb *
  217 __curpcb(void)
  218 {
  219         struct pcb *pcb;
  220 
  221         __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
  222         return (pcb);
  223 }
  224 #define curpcb          (__curpcb())
  225 
  226 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
  227 
  228 #error "this file needs to be ported to your compiler"
  229 
  230 #endif /* lint, etc. */
  231 
  232 #endif /* _KERNEL */
  233 
  234 #endif /* !_MACHINE_PCPU_H_ */

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