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  * $FreeBSD$
   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 struct monitorbuf {
   45         int idle_state;         /* Used by cpu_idle_mwait. */
   46         int stop_state;         /* Used by cpustop_handler. */
   47         char padding[128 - (2 * sizeof(int))];
   48 };
   49 _Static_assert(sizeof(struct monitorbuf) == 128, "2x cache line");
   50 
   51 /*
   52  * The SMP parts are setup in pmap.c and machdep.c for the BSP, and
   53  * pmap.c and mp_machdep.c sets up the data for the AP's to "see" when
   54  * they awake.  The reason for doing it via a struct is so that an
   55  * array of pointers to each CPU's data can be set up for things like
   56  * "check curproc on all other processors"
   57  */
   58 
   59 #define PCPU_MD_FIELDS                                                  \
   60         struct monitorbuf pc_monitorbuf __aligned(128); /* cache line */\
   61         struct  pcpu *pc_prvspace;      /* Self-reference */            \
   62         struct  pmap *pc_curpmap;                                       \
   63         struct  segment_descriptor pc_common_tssd;                      \
   64         struct  segment_descriptor *pc_tss_gdt;                         \
   65         struct  segment_descriptor *pc_fsgs_gdt;                        \
   66         struct  i386tss *pc_common_tssp;                                \
   67         u_int   pc_kesp0;                                               \
   68         u_int   pc_trampstk;                                            \
   69         int     pc_currentldt;                                          \
   70         u_int   pc_acpi_id;             /* ACPI CPU id */               \
   71         u_int   pc_apic_id;                                             \
   72         int     pc_private_tss;         /* Flag indicating private tss*/\
   73         u_int   pc_cmci_mask;           /* MCx banks for CMCI */        \
   74         u_int   pc_vcpu_id;             /* Xen vCPU ID */               \
   75         struct  mtx pc_cmap_lock;                                       \
   76         void    *pc_cmap_pte1;                                          \
   77         void    *pc_cmap_pte2;                                          \
   78         caddr_t pc_cmap_addr1;                                          \
   79         caddr_t pc_cmap_addr2;                                          \
   80         vm_offset_t pc_qmap_addr;       /* KVA for temporary mappings */\
   81         vm_offset_t pc_copyout_maddr;                                   \
   82         vm_offset_t pc_copyout_saddr;                                   \
   83         struct  mtx pc_copyout_mlock;                                   \
   84         struct  sx pc_copyout_slock;                                    \
   85         char    *pc_copyout_buf;                                        \
   86         vm_offset_t pc_pmap_eh_va;                                      \
   87         caddr_t pc_pmap_eh_ptep;                                        \
   88         uint32_t pc_smp_tlb_done;       /* TLB op acknowledgement */    \
   89         uint32_t pc_ibpb_set;                                           \
   90         void    *pc_mds_buf;                                            \
   91         void    *pc_mds_buf64;                                          \
   92         uint32_t pc_pad[4];                                             \
   93         uint8_t pc_mds_tmp[64];                                         \
   94         u_int   pc_ipi_bitmap;                                          \
   95         char    __pad[3518]
   96 
   97 #ifdef _KERNEL
   98 
   99 #define MONITOR_STOPSTATE_RUNNING       0
  100 #define MONITOR_STOPSTATE_STOPPED       1
  101 
  102 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
  103 
  104 /*
  105  * Evaluates to the byte offset of the per-cpu variable name.
  106  */
  107 #define __pcpu_offset(name)                                             \
  108         __offsetof(struct pcpu, name)
  109 
  110 /*
  111  * Evaluates to the type of the per-cpu variable name.
  112  */
  113 #define __pcpu_type(name)                                               \
  114         __typeof(((struct pcpu *)0)->name)
  115 
  116 /*
  117  * Evaluates to the address of the per-cpu variable name.
  118  */
  119 #define __PCPU_PTR(name) __extension__ ({                               \
  120         __pcpu_type(name) *__p;                                         \
  121                                                                         \
  122         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
  123             : "=r" (__p)                                                \
  124             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
  125               "i" (__pcpu_offset(name)));                               \
  126                                                                         \
  127         __p;                                                            \
  128 })
  129 
  130 /*
  131  * Evaluates to the value of the per-cpu variable name.
  132  */
  133 #define __PCPU_GET(name) __extension__ ({                               \
  134         __pcpu_type(name) __res;                                        \
  135         struct __s {                                                    \
  136                 u_char  __b[MIN(sizeof(__res), 4)];                     \
  137         } __s;                                                          \
  138                                                                         \
  139         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
  140             sizeof(__res) == 4) {                                       \
  141                 __asm __volatile("mov %%fs:%1,%0"                       \
  142                     : "=r" (__s)                                        \
  143                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
  144                 *(struct __s *)(void *)&__res = __s;                    \
  145         } else {                                                        \
  146                 __res = *__PCPU_PTR(name);                              \
  147         }                                                               \
  148         __res;                                                          \
  149 })
  150 
  151 /*
  152  * Adds a value of the per-cpu counter name.  The implementation
  153  * must be atomic with respect to interrupts.
  154  */
  155 #define __PCPU_ADD(name, val) do {                                      \
  156         __pcpu_type(name) __val;                                        \
  157         struct __s {                                                    \
  158                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  159         } __s;                                                          \
  160                                                                         \
  161         __val = (val);                                                  \
  162         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  163             sizeof(__val) == 4) {                                       \
  164                 __s = *(struct __s *)(void *)&__val;                    \
  165                 __asm __volatile("add %1,%%fs:%0"                       \
  166                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  167                     : "r" (__s));                                       \
  168         } else                                                          \
  169                 *__PCPU_PTR(name) += __val;                             \
  170 } while (0)
  171 
  172 /*
  173  * Increments the value of the per-cpu counter name.  The implementation
  174  * must be atomic with respect to interrupts.
  175  */
  176 #define __PCPU_INC(name) do {                                           \
  177         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
  178             sizeof(__pcpu_type(name)) == 2 ||                           \
  179             sizeof(__pcpu_type(name)) == 4);                            \
  180         if (sizeof(__pcpu_type(name)) == 1) {                           \
  181                 __asm __volatile("incb %%fs:%0"                         \
  182                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  183                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  184         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
  185                 __asm __volatile("incw %%fs:%0"                         \
  186                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  187                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  188         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
  189                 __asm __volatile("incl %%fs:%0"                         \
  190                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
  191                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
  192         }                                                               \
  193 } while (0)
  194 
  195 /*
  196  * Sets the value of the per-cpu variable name to value val.
  197  */
  198 #define __PCPU_SET(name, val) do {                                      \
  199         __pcpu_type(name) __val;                                        \
  200         struct __s {                                                    \
  201                 u_char  __b[MIN(sizeof(__val), 4)];                     \
  202         } __s;                                                          \
  203                                                                         \
  204         __val = (val);                                                  \
  205         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
  206             sizeof(__val) == 4) {                                       \
  207                 __s = *(struct __s *)(void *)&__val;                    \
  208                 __asm __volatile("mov %1,%%fs:%0"                       \
  209                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
  210                     : "r" (__s));                                       \
  211         } else {                                                        \
  212                 *__PCPU_PTR(name) = __val;                              \
  213         }                                                               \
  214 } while (0)
  215 
  216 #define get_pcpu() __extension__ ({                                     \
  217         struct pcpu *__pc;                                              \
  218                                                                         \
  219         __asm __volatile("movl %%fs:%1,%0"                              \
  220             : "=r" (__pc)                                               \
  221             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))));      \
  222         __pc;                                                           \
  223 })
  224 
  225 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
  226 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
  227 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
  228 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
  229 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
  230 
  231 #define IS_BSP()        (PCPU_GET(cpuid) == 0)
  232 
  233 #else /* defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
  234 
  235 #error "this file needs to be ported to your compiler"
  236 
  237 #endif /* __GNUCLIKE_ASM etc. */
  238 
  239 #endif /* _KERNEL */
  240 
  241 #endif /* !_MACHINE_PCPU_H_ */

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