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/11.1/sys/i386/include/pcpu.h 313862 2017-02-17 07:08:37Z 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 #include <sys/_lock.h>
   40 #include <sys/_mutex.h>
   41 
   42 /*
   43  * The SMP parts are setup in pmap.c and locore.s for the BSP, and
   44  * mp_machdep.c sets up the data for the AP's to "see" when they awake.
   45  * The reason for doing it via a struct is so that an array of pointers
   46  * to each CPU's data can be set up for things like "check curproc on all
   47  * other processors"
   48  */
   49 
   50 #define PCPU_MD_FIELDS                                                  \
   51         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
   52         struct  pcpu *pc_prvspace;      /* Self-reference */            \
   53         struct  pmap *pc_curpmap;                                       \
   54         struct  i386tss pc_common_tss;                                  \
   55         struct  segment_descriptor pc_common_tssd;                      \
   56         struct  segment_descriptor *pc_tss_gdt;                         \
   57         struct  segment_descriptor *pc_fsgs_gdt;                        \
   58         int     pc_currentldt;                                          \
   59         u_int   pc_acpi_id;             /* ACPI CPU id */               \
   60         u_int   pc_apic_id;                                             \
   61         int     pc_private_tss;         /* Flag indicating private tss*/\
   62         u_int   pc_cmci_mask;           /* MCx banks for CMCI */        \
   63         u_int   pc_vcpu_id;             /* Xen vCPU ID */               \
   64         struct  mtx pc_cmap_lock;                                       \
   65         void    *pc_cmap_pte1;                                          \
   66         void    *pc_cmap_pte2;                                          \
   67         caddr_t pc_cmap_addr1;                                          \
   68         caddr_t pc_cmap_addr2;                                          \
   69         vm_offset_t pc_qmap_addr;       /* KVA for temporary mappings */\
   70         uint32_t pc_smp_tlb_done;       /* TLB op acknowledgement */    \
   71         char    __pad[189]
   72 
   73 #ifdef _KERNEL
   74 
   75 #ifdef lint
   76 
   77 extern struct pcpu *pcpup;
   78 
   79 #define get_pcpu()              (pcpup)
   80 #define PCPU_GET(member)        (pcpup->pc_ ## member)
   81 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
   82 #define PCPU_INC(member)        PCPU_ADD(member, 1)
   83 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
   84 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
   85 
   86 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
   87 
   88 /*
   89  * Evaluates to the byte offset of the per-cpu variable name.
   90  */
   91 #define __pcpu_offset(name)                                             \
   92         __offsetof(struct pcpu, name)
   93 
   94 /*
   95  * Evaluates to the type of the per-cpu variable name.
   96  */
   97 #define __pcpu_type(name)                                               \
   98         __typeof(((struct pcpu *)0)->name)
   99 
  100 /*
  101  * Evaluates to the address of the per-cpu variable name.
  102  */
  103 #define __PCPU_PTR(name) __extension__ ({                               \
  104         __pcpu_type(name) *__p;                                         \
  105                                                                         \
  106         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
  107             : "=r" (__p)                                                \
  108             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
  109               "i" (__pcpu_offset(name)));                               \
  110                                                                         \
  111         __p;                                                            \
  112 })
  113 
  114 /*
  115  * Evaluates to the value of the per-cpu variable name.
  116  */
  117 #define __PCPU_GET(name) __extension__ ({                               \
  118         __pcpu_type(name) __res;                                        \
  119         struct __s {                                                    \
  120                 u_char  __b[MIN(sizeof(__res), 4)];                     \
  121         } __s;                                                          \
  122                                                                         \
  123         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
  124             sizeof(__res) == 4) {                                       \
  125                 __asm __volatile("mov %%fs:%1,%0"                       \
  126                     : "=r" (__s)                                        \
  127                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
  128                 *(struct __s *)(void *)&__res = __s;                    \
  129         } else {                                                        \
  130                 __res = *__PCPU_PTR(name);                              \
  131         }                                                               \
  132         __res;                                                          \
  133 })
  134 
  135 /*
  136  * Adds a value of the per-cpu counter name.  The implementation
  137  * must be atomic with respect to interrupts.
  138  */
  139 #define __PCPU_ADD(name, val) do {                                      \
  140         __pcpu_type(name) __val;                                        \
  141         struct __s {                                                    \
  142                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  143         } __s;                                                          \
  144                                                                         \
  145         __val = (val);                                                  \
  146         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  147             sizeof(__val) == 4) {                                       \
  148                 __s = *(struct __s *)(void *)&__val;                    \
  149                 __asm __volatile("add %1,%%fs:%0"                       \
  150                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  151                     : "r" (__s));                                       \
  152         } else                                                          \
  153                 *__PCPU_PTR(name) += __val;                             \
  154 } while (0)
  155 
  156 /*
  157  * Increments the value of the per-cpu counter name.  The implementation
  158  * must be atomic with respect to interrupts.
  159  */
  160 #define __PCPU_INC(name) do {                                           \
  161         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
  162             sizeof(__pcpu_type(name)) == 2 ||                           \
  163             sizeof(__pcpu_type(name)) == 4);                            \
  164         if (sizeof(__pcpu_type(name)) == 1) {                           \
  165                 __asm __volatile("incb %%fs:%0"                         \
  166                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  167                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  168         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
  169                 __asm __volatile("incw %%fs:%0"                         \
  170                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  171                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  172         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
  173                 __asm __volatile("incl %%fs:%0"                         \
  174                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  175                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  176         }                                                               \
  177 } while (0)
  178 
  179 /*
  180  * Sets the value of the per-cpu variable name to value val.
  181  */
  182 #define __PCPU_SET(name, val) do {                                      \
  183         __pcpu_type(name) __val;                                        \
  184         struct __s {                                                    \
  185                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  186         } __s;                                                          \
  187                                                                         \
  188         __val = (val);                                                  \
  189         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  190             sizeof(__val) == 4) {                                       \
  191                 __s = *(struct __s *)(void *)&__val;                    \
  192                 __asm __volatile("mov %1,%%fs:%0"                       \
  193                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  194                     : "r" (__s));                                       \
  195         } else {                                                        \
  196                 *__PCPU_PTR(name) = __val;                              \
  197         }                                                               \
  198 } while (0)
  199 
  200 #define get_pcpu() __extension__ ({                                     \
  201         struct pcpu *__pc;                                              \
  202                                                                         \
  203         __asm __volatile("movl %%fs:%1,%0"                              \
  204             : "=r" (__pc)                                               \
  205             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))));      \
  206         __pc;                                                           \
  207 })
  208 
  209 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
  210 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
  211 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
  212 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
  213 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
  214 
  215 #define OFFSETOF_CURTHREAD      0
  216 #ifdef __clang__
  217 #pragma clang diagnostic push
  218 #pragma clang diagnostic ignored "-Wnull-dereference"
  219 #endif
  220 static __inline __pure2 struct thread *
  221 __curthread(void)
  222 {
  223         struct thread *td;
  224 
  225         __asm("movl %%fs:%1,%0" : "=r" (td)
  226             : "m" (*(char *)OFFSETOF_CURTHREAD));
  227         return (td);
  228 }
  229 #ifdef __clang__
  230 #pragma clang diagnostic pop
  231 #endif
  232 #define curthread               (__curthread())
  233 
  234 #define OFFSETOF_CURPCB         16
  235 static __inline __pure2 struct pcb *
  236 __curpcb(void)
  237 {
  238         struct pcb *pcb;
  239 
  240         __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
  241         return (pcb);
  242 }
  243 #define curpcb          (__curpcb())
  244 
  245 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
  246 
  247 #error "this file needs to be ported to your compiler"
  248 
  249 #endif /* lint, etc. */
  250 
  251 #endif /* _KERNEL */
  252 
  253 #endif /* !_MACHINE_PCPU_H_ */

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