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: stable/12/sys/i386/include/pcpu.h 354093 2019-10-25 18:56:46Z mav $
   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         void    *pc_mds_buf;                                            \
   84         void    *pc_mds_buf64;                                          \
   85         uint32_t pc_pad[4];                                             \
   86         uint8_t pc_mds_tmp[64];                                         \
   87         char    __pad[3522]
   88 
   89 #ifdef _KERNEL
   90 
   91 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
   92 
   93 /*
   94  * Evaluates to the byte offset of the per-cpu variable name.
   95  */
   96 #define __pcpu_offset(name)                                             \
   97         __offsetof(struct pcpu, name)
   98 
   99 /*
  100  * Evaluates to the type of the per-cpu variable name.
  101  */
  102 #define __pcpu_type(name)                                               \
  103         __typeof(((struct pcpu *)0)->name)
  104 
  105 /*
  106  * Evaluates to the address of the per-cpu variable name.
  107  */
  108 #define __PCPU_PTR(name) __extension__ ({                               \
  109         __pcpu_type(name) *__p;                                         \
  110                                                                         \
  111         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
  112             : "=r" (__p)                                                \
  113             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
  114               "i" (__pcpu_offset(name)));                               \
  115                                                                         \
  116         __p;                                                            \
  117 })
  118 
  119 /*
  120  * Evaluates to the value of the per-cpu variable name.
  121  */
  122 #define __PCPU_GET(name) __extension__ ({                               \
  123         __pcpu_type(name) __res;                                        \
  124         struct __s {                                                    \
  125                 u_char  __b[MIN(sizeof(__res), 4)];                     \
  126         } __s;                                                          \
  127                                                                         \
  128         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
  129             sizeof(__res) == 4) {                                       \
  130                 __asm __volatile("mov %%fs:%1,%0"                       \
  131                     : "=r" (__s)                                        \
  132                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
  133                 *(struct __s *)(void *)&__res = __s;                    \
  134         } else {                                                        \
  135                 __res = *__PCPU_PTR(name);                              \
  136         }                                                               \
  137         __res;                                                          \
  138 })
  139 
  140 /*
  141  * Adds a value of the per-cpu counter name.  The implementation
  142  * must be atomic with respect to interrupts.
  143  */
  144 #define __PCPU_ADD(name, val) do {                                      \
  145         __pcpu_type(name) __val;                                        \
  146         struct __s {                                                    \
  147                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  148         } __s;                                                          \
  149                                                                         \
  150         __val = (val);                                                  \
  151         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  152             sizeof(__val) == 4) {                                       \
  153                 __s = *(struct __s *)(void *)&__val;                    \
  154                 __asm __volatile("add %1,%%fs:%0"                       \
  155                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  156                     : "r" (__s));                                       \
  157         } else                                                          \
  158                 *__PCPU_PTR(name) += __val;                             \
  159 } while (0)
  160 
  161 /*
  162  * Increments the value of the per-cpu counter name.  The implementation
  163  * must be atomic with respect to interrupts.
  164  */
  165 #define __PCPU_INC(name) do {                                           \
  166         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
  167             sizeof(__pcpu_type(name)) == 2 ||                           \
  168             sizeof(__pcpu_type(name)) == 4);                            \
  169         if (sizeof(__pcpu_type(name)) == 1) {                           \
  170                 __asm __volatile("incb %%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)) == 2) {                    \
  174                 __asm __volatile("incw %%fs:%0"                         \
  175                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  176                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  177         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
  178                 __asm __volatile("incl %%fs:%0"                         \
  179                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  180                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  181         }                                                               \
  182 } while (0)
  183 
  184 /*
  185  * Sets the value of the per-cpu variable name to value val.
  186  */
  187 #define __PCPU_SET(name, val) do {                                      \
  188         __pcpu_type(name) __val;                                        \
  189         struct __s {                                                    \
  190                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  191         } __s;                                                          \
  192                                                                         \
  193         __val = (val);                                                  \
  194         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  195             sizeof(__val) == 4) {                                       \
  196                 __s = *(struct __s *)(void *)&__val;                    \
  197                 __asm __volatile("mov %1,%%fs:%0"                       \
  198                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  199                     : "r" (__s));                                       \
  200         } else {                                                        \
  201                 *__PCPU_PTR(name) = __val;                              \
  202         }                                                               \
  203 } while (0)
  204 
  205 #define get_pcpu() __extension__ ({                                     \
  206         struct pcpu *__pc;                                              \
  207                                                                         \
  208         __asm __volatile("movl %%fs:%1,%0"                              \
  209             : "=r" (__pc)                                               \
  210             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))));      \
  211         __pc;                                                           \
  212 })
  213 
  214 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
  215 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
  216 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
  217 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
  218 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
  219 
  220 #define IS_BSP()        (PCPU_GET(cpuid) == 0)
  221 
  222 #else /* defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
  223 
  224 #error "this file needs to be ported to your compiler"
  225 
  226 #endif /* __GNUCLIKE_ASM etc. */
  227 
  228 #endif /* _KERNEL */
  229 
  230 #endif /* !_MACHINE_PCPU_H_ */

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