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: stable/9/sys/i386/include/pcpu.h 266269 2014-05-16 19:28:22Z cperciva $
   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) || defined(XENHVM)
   48 #ifndef NR_VIRQS
   49 #define NR_VIRQS        24
   50 #endif
   51 #ifndef NR_IPIS
   52 #define NR_IPIS         2
   53 #endif
   54 #endif
   55 
   56 #if defined(XEN)
   57 
   58 /* These are peridically updated in shared_info, and then copied here. */
   59 struct shadow_time_info {
   60         uint64_t tsc_timestamp;     /* TSC at last update of time vals.  */
   61         uint64_t system_timestamp;  /* Time, in nanosecs, since boot.    */
   62         uint32_t tsc_to_nsec_mul;
   63         uint32_t tsc_to_usec_mul;
   64         int tsc_shift;
   65         uint32_t version;
   66 };
   67 
   68 #define PCPU_XEN_FIELDS                                                 \
   69         ;                                                               \
   70         u_int   pc_cr3;         /* track cr3 for R1/R3*/                \
   71         vm_paddr_t *pc_pdir_shadow;                                     \
   72         uint64_t pc_processed_system_time;                              \
   73         struct shadow_time_info pc_shadow_time;                         \
   74         int     pc_resched_irq;                                         \
   75         int     pc_callfunc_irq;                                        \
   76         int     pc_virq_to_irq[NR_VIRQS];                               \
   77         int     pc_ipi_to_irq[NR_IPIS]  
   78 
   79 #elif defined(XENHVM) && !defined(MODXENHVM)
   80 
   81 /* This is now unused, but remains here for KBI compatibility reasons. */
   82 #define PCPU_XEN_FIELDS                                                 \
   83         ;                                                               \
   84         unsigned int pc_last_processed_l1i;                             \
   85         unsigned int pc_last_processed_l2i
   86 
   87 #else /* !XEN && (!XENHVM || MODXENHVM) */
   88 
   89 #define PCPU_XEN_FIELDS
   90 
   91 #endif
   92 
   93 #define PCPU_MD_FIELDS                                                  \
   94         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
   95         struct  pcpu *pc_prvspace;      /* Self-reference */            \
   96         struct  pmap *pc_curpmap;                                       \
   97         struct  i386tss pc_common_tss;                                  \
   98         struct  segment_descriptor pc_common_tssd;                      \
   99         struct  segment_descriptor *pc_tss_gdt;                         \
  100         struct  segment_descriptor *pc_fsgs_gdt;                        \
  101         int     pc_currentldt;                                          \
  102         u_int   pc_acpi_id;             /* ACPI CPU id */               \
  103         u_int   pc_apic_id;                                             \
  104         int     pc_private_tss;         /* Flag indicating private tss*/\
  105         u_int   pc_cmci_mask            /* MCx banks for CMCI */        \
  106         PCPU_XEN_FIELDS
  107 
  108 #ifdef _KERNEL
  109 
  110 #ifdef lint
  111 
  112 extern struct pcpu *pcpup;
  113 
  114 #define PCPU_GET(member)        (pcpup->pc_ ## member)
  115 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
  116 #define PCPU_INC(member)        PCPU_ADD(member, 1)
  117 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
  118 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
  119 
  120 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
  121 
  122 /*
  123  * Evaluates to the byte offset of the per-cpu variable name.
  124  */
  125 #define __pcpu_offset(name)                                             \
  126         __offsetof(struct pcpu, name)
  127 
  128 /*
  129  * Evaluates to the type of the per-cpu variable name.
  130  */
  131 #define __pcpu_type(name)                                               \
  132         __typeof(((struct pcpu *)0)->name)
  133 
  134 /*
  135  * Evaluates to the address of the per-cpu variable name.
  136  */
  137 #define __PCPU_PTR(name) __extension__ ({                               \
  138         __pcpu_type(name) *__p;                                         \
  139                                                                         \
  140         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
  141             : "=r" (__p)                                                \
  142             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
  143               "i" (__pcpu_offset(name)));                               \
  144                                                                         \
  145         __p;                                                            \
  146 })
  147 
  148 /*
  149  * Evaluates to the value of the per-cpu variable name.
  150  */
  151 #define __PCPU_GET(name) __extension__ ({                               \
  152         __pcpu_type(name) __res;                                        \
  153         struct __s {                                                    \
  154                 u_char  __b[MIN(sizeof(__res), 4)];                     \
  155         } __s;                                                          \
  156                                                                         \
  157         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
  158             sizeof(__res) == 4) {                                       \
  159                 __asm __volatile("mov %%fs:%1,%0"                       \
  160                     : "=r" (__s)                                        \
  161                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
  162                 *(struct __s *)(void *)&__res = __s;                    \
  163         } else {                                                        \
  164                 __res = *__PCPU_PTR(name);                              \
  165         }                                                               \
  166         __res;                                                          \
  167 })
  168 
  169 /*
  170  * Adds a value of the per-cpu counter name.  The implementation
  171  * must be atomic with respect to interrupts.
  172  */
  173 #define __PCPU_ADD(name, val) do {                                      \
  174         __pcpu_type(name) __val;                                        \
  175         struct __s {                                                    \
  176                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  177         } __s;                                                          \
  178                                                                         \
  179         __val = (val);                                                  \
  180         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  181             sizeof(__val) == 4) {                                       \
  182                 __s = *(struct __s *)(void *)&__val;                    \
  183                 __asm __volatile("add %1,%%fs:%0"                       \
  184                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  185                     : "r" (__s));                                       \
  186         } else                                                          \
  187                 *__PCPU_PTR(name) += __val;                             \
  188 } while (0)
  189 
  190 /*
  191  * Increments the value of the per-cpu counter name.  The implementation
  192  * must be atomic with respect to interrupts.
  193  */
  194 #define __PCPU_INC(name) do {                                           \
  195         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
  196             sizeof(__pcpu_type(name)) == 2 ||                           \
  197             sizeof(__pcpu_type(name)) == 4);                            \
  198         if (sizeof(__pcpu_type(name)) == 1) {                           \
  199                 __asm __volatile("incb %%fs:%0"                         \
  200                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  201                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  202         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
  203                 __asm __volatile("incw %%fs:%0"                         \
  204                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  205                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  206         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
  207                 __asm __volatile("incl %%fs:%0"                         \
  208                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  209                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  210         }                                                               \
  211 } while (0)
  212 
  213 /*
  214  * Sets the value of the per-cpu variable name to value val.
  215  */
  216 #define __PCPU_SET(name, val) do {                                      \
  217         __pcpu_type(name) __val;                                        \
  218         struct __s {                                                    \
  219                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  220         } __s;                                                          \
  221                                                                         \
  222         __val = (val);                                                  \
  223         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  224             sizeof(__val) == 4) {                                       \
  225                 __s = *(struct __s *)(void *)&__val;                    \
  226                 __asm __volatile("mov %1,%%fs:%0"                       \
  227                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  228                     : "r" (__s));                                       \
  229         } else {                                                        \
  230                 *__PCPU_PTR(name) = __val;                              \
  231         }                                                               \
  232 } while (0)
  233 
  234 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
  235 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
  236 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
  237 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
  238 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
  239 
  240 #define OFFSETOF_CURTHREAD      0
  241 #ifdef __clang__
  242 #pragma clang diagnostic push
  243 #pragma clang diagnostic ignored "-Wnull-dereference"
  244 #endif
  245 static __inline __pure2 struct thread *
  246 __curthread(void)
  247 {
  248         struct thread *td;
  249 
  250         __asm("movl %%fs:%1,%0" : "=r" (td)
  251             : "m" (*(char *)OFFSETOF_CURTHREAD));
  252         return (td);
  253 }
  254 #ifdef __clang__
  255 #pragma clang diagnostic pop
  256 #endif
  257 #define curthread               (__curthread())
  258 
  259 #define OFFSETOF_CURPCB         16
  260 static __inline __pure2 struct pcb *
  261 __curpcb(void)
  262 {
  263         struct pcb *pcb;
  264 
  265         __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
  266         return (pcb);
  267 }
  268 #define curpcb          (__curpcb())
  269 
  270 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
  271 
  272 #error "this file needs to be ported to your compiler"
  273 
  274 #endif /* lint, etc. */
  275 
  276 #endif /* _KERNEL */
  277 
  278 #endif /* !_MACHINE_PCPU_H_ */

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