sys/i386/include/pcpu.h

   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  * $FreeBSD$
  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 #define PCPU_MD_FIELDS                                                  \
  48         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
  49         struct  pcpu *pc_prvspace;      /* Self-reference */            \
  50         struct  pmap *pc_curpmap;                                       \
  51         struct  i386tss pc_common_tss;                                  \
  52         struct  segment_descriptor pc_common_tssd;                      \
  53         struct  segment_descriptor *pc_tss_gdt;                         \
  54         struct  segment_descriptor *pc_fsgs_gdt;                        \
  55         int     pc_currentldt;                                          \
  56         u_int   pc_acpi_id;             /* ACPI CPU id */               \
  57         u_int   pc_apic_id;                                             \
  58         int     pc_private_tss;         /* Flag indicating private tss*/\
  59         u_int   pc_cmci_mask;           /* MCx banks for CMCI */        \
  60         u_int   pc_vcpu_id;             /* Xen vCPU ID */               \
  61         vm_offset_t pc_qmap_addr;       /* KVA for temporary mappings */\
  62         char    __pad[229]
  63
  64 #ifdef _KERNEL
  65
  66 #ifdef lint
  67
  68 extern struct pcpu *pcpup;
  69
  70 #define PCPU_GET(member)        (pcpup->pc_ ## member)
  71 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
  72 #define PCPU_INC(member)        PCPU_ADD(member, 1)
  73 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
  74 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
  75
  76 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
  77
  78 /*
  79  * Evaluates to the byte offset of the per-cpu variable name.
  80  */
  81 #define __pcpu_offset(name)                                             \
  82         __offsetof(struct pcpu, name)
  83
  84 /*
  85  * Evaluates to the type of the per-cpu variable name.
  86  */
  87 #define __pcpu_type(name)                                               \
  88         __typeof(((struct pcpu *)0)->name)
  89
  90 /*
  91  * Evaluates to the address of the per-cpu variable name.
  92  */
  93 #define __PCPU_PTR(name) __extension__ ({                               \
  94         __pcpu_type(name) *__p;                                         \
  95                                                                         \
  96         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
  97             : "=r" (__p)                                                \
  98             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
  99               "i" (__pcpu_offset(name)));                               \
 100                                                                         \
 101         __p;                                                            \
 102 })
 103
 104 /*
 105  * Evaluates to the value of the per-cpu variable name.
 106  */
 107 #define __PCPU_GET(name) __extension__ ({                               \
 108         __pcpu_type(name) __res;                                        \
 109         struct __s {                                                    \
 110                 u_char  __b[MIN(sizeof(__res), 4)];                     \
 111         } __s;                                                          \
 112                                                                         \
 113         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
 114             sizeof(__res) == 4) {                                       \
 115                 __asm __volatile("mov %%fs:%1,%0"                       \
 116                     : "=r" (__s)                                        \
 117                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
 118                 *(struct __s *)(void *)&__res = __s;                    \
 119         } else {                                                        \
 120                 __res = *__PCPU_PTR(name);                              \
 121         }                                                               \
 122         __res;                                                          \
 123 })
 124
 125 /*
 126  * Adds a value of the per-cpu counter name.  The implementation
 127  * must be atomic with respect to interrupts.
 128  */
 129 #define __PCPU_ADD(name, val) do {                                      \
 130         __pcpu_type(name) __val;                                        \
 131         struct __s {                                                    \
 132                 u_char  __b[MIN(sizeof(__val), 4)];                     \
 133         } __s;                                                          \
 134                                                                         \
 135         __val = (val);                                                  \
 136         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 137             sizeof(__val) == 4) {                                       \
 138                 __s = *(struct __s *)(void *)&__val;                    \
 139                 __asm __volatile("add %1,%%fs:%0"                       \
 140                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 141                     : "r" (__s));                                       \
 142         } else                                                          \
 143                 *__PCPU_PTR(name) += __val;                             \
 144 } while (0)
 145
 146 /*
 147  * Increments the value of the per-cpu counter name.  The implementation
 148  * must be atomic with respect to interrupts.
 149  */
 150 #define __PCPU_INC(name) do {                                           \
 151         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
 152             sizeof(__pcpu_type(name)) == 2 ||                           \
 153             sizeof(__pcpu_type(name)) == 4);                            \
 154         if (sizeof(__pcpu_type(name)) == 1) {                           \
 155                 __asm __volatile("incb %%fs:%0"                         \
 156                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 157                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 158         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
 159                 __asm __volatile("incw %%fs:%0"                         \
 160                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 161                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 162         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
 163                 __asm __volatile("incl %%fs:%0"                         \
 164                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 165                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 166         }                                                               \
 167 } while (0)
 168
 169 /*
 170  * Sets the value of the per-cpu variable name to value val.
 171  */
 172 #define __PCPU_SET(name, val) do {                                      \
 173         __pcpu_type(name) __val;                                        \
 174         struct __s {                                                    \
 175                 u_char  __b[MIN(sizeof(__val), 4)];                     \
 176         } __s;                                                          \
 177                                                                         \
 178         __val = (val);                                                  \
 179         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 180             sizeof(__val) == 4) {                                       \
 181                 __s = *(struct __s *)(void *)&__val;                    \
 182                 __asm __volatile("mov %1,%%fs:%0"                       \
 183                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 184                     : "r" (__s));                                       \
 185         } else {                                                        \
 186                 *__PCPU_PTR(name) = __val;                              \
 187         }                                                               \
 188 } while (0)
 189
 190 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
 191 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
 192 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
 193 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
 194 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
 195
 196 #define OFFSETOF_CURTHREAD      0
 197 #ifdef __clang__
 198 #pragma clang diagnostic push
 199 #pragma clang diagnostic ignored "-Wnull-dereference"
 200 #endif
 201 static __inline __pure2 struct thread *
 202 __curthread(void)
 203 {
 204         struct thread *td;
 205
 206         __asm("movl %%fs:%1,%0" : "=r" (td)
 207             : "m" (*(char *)OFFSETOF_CURTHREAD));
 208         return (td);
 209 }
 210 #ifdef __clang__
 211 #pragma clang diagnostic pop
 212 #endif
 213 #define curthread               (__curthread())
 214
 215 #define OFFSETOF_CURPCB         16
 216 static __inline __pure2 struct pcb *
 217 __curpcb(void)
 218 {
 219         struct pcb *pcb;
 220
 221         __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
 222         return (pcb);
 223 }
 224 #define curpcb          (__curpcb())
 225
 226 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
 227
 228 #error "this file needs to be ported to your compiler"
 229
 230 #endif /* lint, etc. */
 231
 232 #endif /* _KERNEL */
 233
 234 #endif /* !_MACHINE_PCPU_H_ */