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/8.0/sys/i386/include/pcpu.h 184198 2008-10-23 07:20:43Z kmacy $
   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 #ifdef XEN
   48 #ifndef NR_VIRQS
   49 #define NR_VIRQS        24
   50 #endif
   51 #ifndef NR_IPIS
   52 #define NR_IPIS         2
   53 #endif
   54 
   55 /* These are peridically updated in shared_info, and then copied here. */
   56 struct shadow_time_info {
   57         uint64_t tsc_timestamp;     /* TSC at last update of time vals.  */
   58         uint64_t system_timestamp;  /* Time, in nanosecs, since boot.    */
   59         uint32_t tsc_to_nsec_mul;
   60         uint32_t tsc_to_usec_mul;
   61         int tsc_shift;
   62         uint32_t version;
   63 };
   64 
   65 
   66 #define PCPU_MD_FIELDS                                                  \
   67         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
   68         struct  pcpu *pc_prvspace;      /* Self-reference */            \
   69         struct  pmap *pc_curpmap;                                       \
   70         struct  i386tss pc_common_tss;                                  \
   71         struct  segment_descriptor pc_common_tssd;                      \
   72         struct  segment_descriptor *pc_tss_gdt;                         \
   73         struct  segment_descriptor *pc_fsgs_gdt;                        \
   74         vm_paddr_t      *pc_pdir_shadow;                                \
   75         int     pc_currentldt;                                          \
   76         u_int   pc_acpi_id;             /* ACPI CPU id */               \
   77         u_int   pc_apic_id;                                             \
   78         int     pc_private_tss;         /* Flag indicating private tss*/\
   79         u_int     pc_cr3;               /* track cr3 for R1/R3*/        \
   80         u_int     pc_pdir;                                              \
   81         u_int     pc_lazypmap;                                          \
   82         u_int     pc_rendezvous;                                        \
   83         u_int     pc_cpuast;                                            \
   84         uint64_t  pc_processed_system_time;                             \
   85         struct shadow_time_info pc_shadow_time;                         \
   86         int     pc_resched_irq;                                         \
   87         int     pc_callfunc_irq;                                        \
   88         int     pc_virq_to_irq[NR_VIRQS];                               \
   89         int     pc_ipi_to_irq[NR_IPIS]
   90         
   91 
   92         
   93 #else
   94 #define PCPU_MD_FIELDS                                                  \
   95         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
   96         struct  pcpu *pc_prvspace;      /* Self-reference */            \
   97         struct  pmap *pc_curpmap;                                       \
   98         struct  i386tss pc_common_tss;                                  \
   99         struct  segment_descriptor pc_common_tssd;                      \
  100         struct  segment_descriptor *pc_tss_gdt;                         \
  101         struct  segment_descriptor *pc_fsgs_gdt;                        \
  102         int     pc_currentldt;                                          \
  103         u_int   pc_acpi_id;             /* ACPI CPU id */               \
  104         u_int   pc_apic_id;                                             \
  105         int     pc_private_tss          /* Flag indicating private tss */
  106 
  107 #endif
  108 
  109 #ifdef _KERNEL
  110 
  111 #ifdef lint
  112 
  113 extern struct pcpu *pcpup;
  114 
  115 #define PCPU_GET(member)        (pcpup->pc_ ## member)
  116 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
  117 #define PCPU_INC(member)        PCPU_ADD(member, 1)
  118 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
  119 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
  120 
  121 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
  122 
  123 /*
  124  * Evaluates to the byte offset of the per-cpu variable name.
  125  */
  126 #define __pcpu_offset(name)                                             \
  127         __offsetof(struct pcpu, name)
  128 
  129 /*
  130  * Evaluates to the type of the per-cpu variable name.
  131  */
  132 #define __pcpu_type(name)                                               \
  133         __typeof(((struct pcpu *)0)->name)
  134 
  135 /*
  136  * Evaluates to the address of the per-cpu variable name.
  137  */
  138 #define __PCPU_PTR(name) __extension__ ({                               \
  139         __pcpu_type(name) *__p;                                         \
  140                                                                         \
  141         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
  142             : "=r" (__p)                                                \
  143             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
  144               "i" (__pcpu_offset(name)));                               \
  145                                                                         \
  146         __p;                                                            \
  147 })
  148 
  149 /*
  150  * Evaluates to the value of the per-cpu variable name.
  151  */
  152 #define __PCPU_GET(name) __extension__ ({                               \
  153         __pcpu_type(name) __res;                                        \
  154         struct __s {                                                    \
  155                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 4)];         \
  156         } __s;                                                          \
  157                                                                         \
  158         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
  159             sizeof(__res) == 4) {                                       \
  160                 __asm __volatile("mov %%fs:%1,%0"                       \
  161                     : "=r" (__s)                                        \
  162                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
  163                 *(struct __s *)(void *)&__res = __s;                    \
  164         } else {                                                        \
  165                 __res = *__PCPU_PTR(name);                              \
  166         }                                                               \
  167         __res;                                                          \
  168 })
  169 
  170 /*
  171  * Adds a value of the per-cpu counter name.  The implementation
  172  * must be atomic with respect to interrupts.
  173  */
  174 #define __PCPU_ADD(name, val) do {                                      \
  175         __pcpu_type(name) __val;                                        \
  176         struct __s {                                                    \
  177                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 4)];         \
  178         } __s;                                                          \
  179                                                                         \
  180         __val = (val);                                                  \
  181         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  182             sizeof(__val) == 4) {                                       \
  183                 __s = *(struct __s *)(void *)&__val;                    \
  184                 __asm __volatile("add %1,%%fs:%0"                       \
  185                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  186                     : "r" (__s));                                       \
  187         } else                                                          \
  188                 *__PCPU_PTR(name) += __val;                             \
  189 } while (0)
  190 
  191 /*
  192  * Increments the value of the per-cpu counter name.  The implementation
  193  * must be atomic with respect to interrupts.
  194  */
  195 #define __PCPU_INC(name) do {                                           \
  196         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
  197             sizeof(__pcpu_type(name)) == 2 ||                           \
  198             sizeof(__pcpu_type(name)) == 4);                            \
  199         if (sizeof(__pcpu_type(name)) == 1) {                           \
  200                 __asm __volatile("incb %%fs:%0"                         \
  201                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  202                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  203         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
  204                 __asm __volatile("incw %%fs:%0"                         \
  205                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  206                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  207         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
  208                 __asm __volatile("incl %%fs:%0"                         \
  209                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  210                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  211         }                                                               \
  212 } while (0)
  213 
  214 /*
  215  * Sets the value of the per-cpu variable name to value val.
  216  */
  217 #define __PCPU_SET(name, val) {                                         \
  218         __pcpu_type(name) __val;                                        \
  219         struct __s {                                                    \
  220                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 4)];         \
  221         } __s;                                                          \
  222                                                                         \
  223         __val = (val);                                                  \
  224         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  225             sizeof(__val) == 4) {                                       \
  226                 __s = *(struct __s *)(void *)&__val;                    \
  227                 __asm __volatile("mov %1,%%fs:%0"                       \
  228                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  229                     : "r" (__s));                                       \
  230         } else {                                                        \
  231                 *__PCPU_PTR(name) = __val;                              \
  232         }                                                               \
  233 }
  234 
  235 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
  236 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
  237 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
  238 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
  239 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
  240 
  241 static __inline struct thread *
  242 __curthread(void)
  243 {
  244         struct thread *td;
  245 
  246         __asm __volatile("movl %%fs:0,%0" : "=r" (td));
  247         return (td);
  248 }
  249 #define curthread               (__curthread())
  250 
  251 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
  252 
  253 #error "this file needs to be ported to your compiler"
  254 
  255 #endif /* lint, etc. */
  256 
  257 #endif /* _KERNEL */
  258 
  259 #endif /* !_MACHINE_PCPU_H_ */

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