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/10.1/sys/i386/include/pcpu.h 256073 2013-10-05 23:11:01Z gibbs $
   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 #if defined(XEN)
   48 
   49 /* These are peridically updated in shared_info, and then copied here. */
   50 struct shadow_time_info {
   51         uint64_t tsc_timestamp;     /* TSC at last update of time vals.  */
   52         uint64_t system_timestamp;  /* Time, in nanosecs, since boot.    */
   53         uint32_t tsc_to_nsec_mul;
   54         uint32_t tsc_to_usec_mul;
   55         int tsc_shift;
   56         uint32_t version;
   57 };
   58 
   59 #define PCPU_XEN_FIELDS                                                 \
   60         ;                                                               \
   61         u_int   pc_cr3;         /* track cr3 for R1/R3*/                \
   62         vm_paddr_t *pc_pdir_shadow;                                     \
   63         uint64_t pc_processed_system_time;                              \
   64         struct shadow_time_info pc_shadow_time;                         \
   65         char    __pad[185]
   66 
   67 #else /* !XEN */
   68 
   69 #define PCPU_XEN_FIELDS                                                 \
   70         ;                                                               \
   71         char    __pad[233]
   72 
   73 #endif
   74 
   75 #define PCPU_MD_FIELDS                                                  \
   76         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
   77         struct  pcpu *pc_prvspace;      /* Self-reference */            \
   78         struct  pmap *pc_curpmap;                                       \
   79         struct  i386tss pc_common_tss;                                  \
   80         struct  segment_descriptor pc_common_tssd;                      \
   81         struct  segment_descriptor *pc_tss_gdt;                         \
   82         struct  segment_descriptor *pc_fsgs_gdt;                        \
   83         int     pc_currentldt;                                          \
   84         u_int   pc_acpi_id;             /* ACPI CPU id */               \
   85         u_int   pc_apic_id;                                             \
   86         int     pc_private_tss;         /* Flag indicating private tss*/\
   87         u_int   pc_cmci_mask;           /* MCx banks for CMCI */        \
   88         u_int   pc_vcpu_id              /* Xen vCPU ID */               \
   89         PCPU_XEN_FIELDS
   90 
   91 #ifdef _KERNEL
   92 
   93 #ifdef lint
   94 
   95 extern struct pcpu *pcpup;
   96 
   97 #define PCPU_GET(member)        (pcpup->pc_ ## member)
   98 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
   99 #define PCPU_INC(member)        PCPU_ADD(member, 1)
  100 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
  101 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
  102 
  103 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
  104 
  105 /*
  106  * Evaluates to the byte offset of the per-cpu variable name.
  107  */
  108 #define __pcpu_offset(name)                                             \
  109         __offsetof(struct pcpu, name)
  110 
  111 /*
  112  * Evaluates to the type of the per-cpu variable name.
  113  */
  114 #define __pcpu_type(name)                                               \
  115         __typeof(((struct pcpu *)0)->name)
  116 
  117 /*
  118  * Evaluates to the address of the per-cpu variable name.
  119  */
  120 #define __PCPU_PTR(name) __extension__ ({                               \
  121         __pcpu_type(name) *__p;                                         \
  122                                                                         \
  123         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
  124             : "=r" (__p)                                                \
  125             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
  126               "i" (__pcpu_offset(name)));                               \
  127                                                                         \
  128         __p;                                                            \
  129 })
  130 
  131 /*
  132  * Evaluates to the value of the per-cpu variable name.
  133  */
  134 #define __PCPU_GET(name) __extension__ ({                               \
  135         __pcpu_type(name) __res;                                        \
  136         struct __s {                                                    \
  137                 u_char  __b[MIN(sizeof(__res), 4)];                     \
  138         } __s;                                                          \
  139                                                                         \
  140         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
  141             sizeof(__res) == 4) {                                       \
  142                 __asm __volatile("mov %%fs:%1,%0"                       \
  143                     : "=r" (__s)                                        \
  144                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
  145                 *(struct __s *)(void *)&__res = __s;                    \
  146         } else {                                                        \
  147                 __res = *__PCPU_PTR(name);                              \
  148         }                                                               \
  149         __res;                                                          \
  150 })
  151 
  152 /*
  153  * Adds a value of the per-cpu counter name.  The implementation
  154  * must be atomic with respect to interrupts.
  155  */
  156 #define __PCPU_ADD(name, val) do {                                      \
  157         __pcpu_type(name) __val;                                        \
  158         struct __s {                                                    \
  159                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  160         } __s;                                                          \
  161                                                                         \
  162         __val = (val);                                                  \
  163         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  164             sizeof(__val) == 4) {                                       \
  165                 __s = *(struct __s *)(void *)&__val;                    \
  166                 __asm __volatile("add %1,%%fs:%0"                       \
  167                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  168                     : "r" (__s));                                       \
  169         } else                                                          \
  170                 *__PCPU_PTR(name) += __val;                             \
  171 } while (0)
  172 
  173 /*
  174  * Increments the value of the per-cpu counter name.  The implementation
  175  * must be atomic with respect to interrupts.
  176  */
  177 #define __PCPU_INC(name) do {                                           \
  178         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
  179             sizeof(__pcpu_type(name)) == 2 ||                           \
  180             sizeof(__pcpu_type(name)) == 4);                            \
  181         if (sizeof(__pcpu_type(name)) == 1) {                           \
  182                 __asm __volatile("incb %%fs:%0"                         \
  183                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  184                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  185         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
  186                 __asm __volatile("incw %%fs:%0"                         \
  187                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  188                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  189         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
  190                 __asm __volatile("incl %%fs:%0"                         \
  191                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  192                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  193         }                                                               \
  194 } while (0)
  195 
  196 /*
  197  * Sets the value of the per-cpu variable name to value val.
  198  */
  199 #define __PCPU_SET(name, val) do {                                      \
  200         __pcpu_type(name) __val;                                        \
  201         struct __s {                                                    \
  202                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  203         } __s;                                                          \
  204                                                                         \
  205         __val = (val);                                                  \
  206         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  207             sizeof(__val) == 4) {                                       \
  208                 __s = *(struct __s *)(void *)&__val;                    \
  209                 __asm __volatile("mov %1,%%fs:%0"                       \
  210                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  211                     : "r" (__s));                                       \
  212         } else {                                                        \
  213                 *__PCPU_PTR(name) = __val;                              \
  214         }                                                               \
  215 } while (0)
  216 
  217 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
  218 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
  219 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
  220 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
  221 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
  222 
  223 #define OFFSETOF_CURTHREAD      0
  224 #ifdef __clang__
  225 #pragma clang diagnostic push
  226 #pragma clang diagnostic ignored "-Wnull-dereference"
  227 #endif
  228 static __inline __pure2 struct thread *
  229 __curthread(void)
  230 {
  231         struct thread *td;
  232 
  233         __asm("movl %%fs:%1,%0" : "=r" (td)
  234             : "m" (*(char *)OFFSETOF_CURTHREAD));
  235         return (td);
  236 }
  237 #ifdef __clang__
  238 #pragma clang diagnostic pop
  239 #endif
  240 #define curthread               (__curthread())
  241 
  242 #define OFFSETOF_CURPCB         16
  243 static __inline __pure2 struct pcb *
  244 __curpcb(void)
  245 {
  246         struct pcb *pcb;
  247 
  248         __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
  249         return (pcb);
  250 }
  251 #define curpcb          (__curpcb())
  252 
  253 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
  254 
  255 #error "this file needs to be ported to your compiler"
  256 
  257 #endif /* lint, etc. */
  258 
  259 #endif /* _KERNEL */
  260 
  261 #endif /* !_MACHINE_PCPU_H_ */

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