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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) Peter Wemm
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/12.0/sys/i386/include/pcpu.h 336047 2018-07-06 19:50:44Z kib $
   29  */
   30 
   31 #ifndef _MACHINE_PCPU_H_
   32 #define _MACHINE_PCPU_H_
   33 
   34 #ifndef _SYS_CDEFS_H_
   35 #error "sys/cdefs.h is a prerequisite for this file"
   36 #endif
   37 
   38 #include <machine/segments.h>
   39 #include <machine/tss.h>
   40 
   41 #include <sys/_lock.h>
   42 #include <sys/_mutex.h>
   43 
   44 /*
   45  * The SMP parts are setup in pmap.c and machdep.c for the BSP, and
   46  * pmap.c and mp_machdep.c sets up the data for the AP's to "see" when
   47  * they awake.  The reason for doing it via a struct is so that an
   48  * array of pointers to each CPU's data can be set up for things like
   49  * "check curproc on all other processors"
   50  */
   51 
   52 #define PCPU_MD_FIELDS                                                  \
   53         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
   54         struct  pcpu *pc_prvspace;      /* Self-reference */            \
   55         struct  pmap *pc_curpmap;                                       \
   56         struct  segment_descriptor pc_common_tssd;                      \
   57         struct  segment_descriptor *pc_tss_gdt;                         \
   58         struct  segment_descriptor *pc_fsgs_gdt;                        \
   59         struct  i386tss *pc_common_tssp;                                \
   60         u_int   pc_kesp0;                                               \
   61         u_int   pc_trampstk;                                            \
   62         int     pc_currentldt;                                          \
   63         u_int   pc_acpi_id;             /* ACPI CPU id */               \
   64         u_int   pc_apic_id;                                             \
   65         int     pc_private_tss;         /* Flag indicating private tss*/\
   66         u_int   pc_cmci_mask;           /* MCx banks for CMCI */        \
   67         u_int   pc_vcpu_id;             /* Xen vCPU ID */               \
   68         struct  mtx pc_cmap_lock;                                       \
   69         void    *pc_cmap_pte1;                                          \
   70         void    *pc_cmap_pte2;                                          \
   71         caddr_t pc_cmap_addr1;                                          \
   72         caddr_t pc_cmap_addr2;                                          \
   73         vm_offset_t pc_qmap_addr;       /* KVA for temporary mappings */\
   74         vm_offset_t pc_copyout_maddr;                                   \
   75         vm_offset_t pc_copyout_saddr;                                   \
   76         struct  mtx pc_copyout_mlock;                                   \
   77         struct  sx pc_copyout_slock;                                    \
   78         char    *pc_copyout_buf;                                        \
   79         vm_offset_t pc_pmap_eh_va;                                      \
   80         caddr_t pc_pmap_eh_ptep;                                                \
   81         uint32_t pc_smp_tlb_done;       /* TLB op acknowledgement */    \
   82         uint32_t pc_ibpb_set;                                           \
   83         char    __pad[3610]
   84 
   85 #ifdef _KERNEL
   86 
   87 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
   88 
   89 /*
   90  * Evaluates to the byte offset of the per-cpu variable name.
   91  */
   92 #define __pcpu_offset(name)                                             \
   93         __offsetof(struct pcpu, name)
   94 
   95 /*
   96  * Evaluates to the type of the per-cpu variable name.
   97  */
   98 #define __pcpu_type(name)                                               \
   99         __typeof(((struct pcpu *)0)->name)
  100 
  101 /*
  102  * Evaluates to the address of the per-cpu variable name.
  103  */
  104 #define __PCPU_PTR(name) __extension__ ({                               \
  105         __pcpu_type(name) *__p;                                         \
  106                                                                         \
  107         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
  108             : "=r" (__p)                                                \
  109             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
  110               "i" (__pcpu_offset(name)));                               \
  111                                                                         \
  112         __p;                                                            \
  113 })
  114 
  115 /*
  116  * Evaluates to the value of the per-cpu variable name.
  117  */
  118 #define __PCPU_GET(name) __extension__ ({                               \
  119         __pcpu_type(name) __res;                                        \
  120         struct __s {                                                    \
  121                 u_char  __b[MIN(sizeof(__res), 4)];                     \
  122         } __s;                                                          \
  123                                                                         \
  124         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
  125             sizeof(__res) == 4) {                                       \
  126                 __asm __volatile("mov %%fs:%1,%0"                       \
  127                     : "=r" (__s)                                        \
  128                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
  129                 *(struct __s *)(void *)&__res = __s;                    \
  130         } else {                                                        \
  131                 __res = *__PCPU_PTR(name);                              \
  132         }                                                               \
  133         __res;                                                          \
  134 })
  135 
  136 /*
  137  * Adds a value of the per-cpu counter name.  The implementation
  138  * must be atomic with respect to interrupts.
  139  */
  140 #define __PCPU_ADD(name, val) do {                                      \
  141         __pcpu_type(name) __val;                                        \
  142         struct __s {                                                    \
  143                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  144         } __s;                                                          \
  145                                                                         \
  146         __val = (val);                                                  \
  147         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  148             sizeof(__val) == 4) {                                       \
  149                 __s = *(struct __s *)(void *)&__val;                    \
  150                 __asm __volatile("add %1,%%fs:%0"                       \
  151                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  152                     : "r" (__s));                                       \
  153         } else                                                          \
  154                 *__PCPU_PTR(name) += __val;                             \
  155 } while (0)
  156 
  157 /*
  158  * Increments the value of the per-cpu counter name.  The implementation
  159  * must be atomic with respect to interrupts.
  160  */
  161 #define __PCPU_INC(name) do {                                           \
  162         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
  163             sizeof(__pcpu_type(name)) == 2 ||                           \
  164             sizeof(__pcpu_type(name)) == 4);                            \
  165         if (sizeof(__pcpu_type(name)) == 1) {                           \
  166                 __asm __volatile("incb %%fs:%0"                         \
  167                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  168                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  169         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
  170                 __asm __volatile("incw %%fs:%0"                         \
  171                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  172                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  173         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
  174                 __asm __volatile("incl %%fs:%0"                         \
  175                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  176                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  177         }                                                               \
  178 } while (0)
  179 
  180 /*
  181  * Sets the value of the per-cpu variable name to value val.
  182  */
  183 #define __PCPU_SET(name, val) do {                                      \
  184         __pcpu_type(name) __val;                                        \
  185         struct __s {                                                    \
  186                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  187         } __s;                                                          \
  188                                                                         \
  189         __val = (val);                                                  \
  190         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  191             sizeof(__val) == 4) {                                       \
  192                 __s = *(struct __s *)(void *)&__val;                    \
  193                 __asm __volatile("mov %1,%%fs:%0"                       \
  194                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  195                     : "r" (__s));                                       \
  196         } else {                                                        \
  197                 *__PCPU_PTR(name) = __val;                              \
  198         }                                                               \
  199 } while (0)
  200 
  201 #define get_pcpu() __extension__ ({                                     \
  202         struct pcpu *__pc;                                              \
  203                                                                         \
  204         __asm __volatile("movl %%fs:%1,%0"                              \
  205             : "=r" (__pc)                                               \
  206             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))));      \
  207         __pc;                                                           \
  208 })
  209 
  210 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
  211 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
  212 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
  213 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
  214 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
  215 
  216 #define OFFSETOF_CURTHREAD      0
  217 #ifdef __clang__
  218 #pragma clang diagnostic push
  219 #pragma clang diagnostic ignored "-Wnull-dereference"
  220 #endif
  221 static __inline __pure2 struct thread *
  222 __curthread(void)
  223 {
  224         struct thread *td;
  225 
  226         __asm("movl %%fs:%1,%0" : "=r" (td)
  227             : "m" (*(char *)OFFSETOF_CURTHREAD));
  228         return (td);
  229 }
  230 #ifdef __clang__
  231 #pragma clang diagnostic pop
  232 #endif
  233 #define curthread               (__curthread())
  234 
  235 #define OFFSETOF_CURPCB         16
  236 static __inline __pure2 struct pcb *
  237 __curpcb(void)
  238 {
  239         struct pcb *pcb;
  240 
  241         __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
  242         return (pcb);
  243 }
  244 #define curpcb          (__curpcb())
  245 
  246 #define IS_BSP()        (PCPU_GET(cpuid) == 0)
  247 
  248 #else /* defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
  249 
  250 #error "this file needs to be ported to your compiler"
  251 
  252 #endif /* __GNUCLIKE_ASM etc. */
  253 
  254 #endif /* _KERNEL */
  255 
  256 #endif /* !_MACHINE_PCPU_H_ */

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