sys/amd64/include/pcpu.h

   1 /*-
   2  * Copyright (c) Peter Wemm <peter@netplex.com.au>
   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 #if defined(XEN) || defined(XENHVM)
  37 #ifndef NR_VIRQS
  38 #define NR_VIRQS        24
  39 #endif
  40 #ifndef NR_IPIS
  41 #define NR_IPIS         2
  42 #endif
  43 #endif
  44
  45 #ifdef XENHVM
  46 #define PCPU_XEN_FIELDS                                                 \
  47         ;                                                               \
  48         unsigned int pc_last_processed_l1i;                             \
  49         unsigned int pc_last_processed_l2i
  50 #else
  51 #define PCPU_XEN_FIELDS
  52 #endif
  53
  54 /*
  55  * The SMP parts are setup in pmap.c and locore.s for the BSP, and
  56  * mp_machdep.c sets up the data for the AP's to "see" when they awake.
  57  * The reason for doing it via a struct is so that an array of pointers
  58  * to each CPU's data can be set up for things like "check curproc on all
  59  * other processors"
  60  */
  61 #define PCPU_MD_FIELDS                                                  \
  62         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
  63         struct  pcpu *pc_prvspace;      /* Self-reference */            \
  64         struct  pmap *pc_curpmap;                                       \
  65         struct  amd64tss *pc_tssp;      /* TSS segment active on CPU */ \
  66         struct  amd64tss *pc_commontssp;/* Common TSS for the CPU */    \
  67         register_t pc_rsp0;                                             \
  68         register_t pc_scratch_rsp;      /* User %rsp in syscall */      \
  69         u_int   pc_apic_id;                                             \
  70         u_int   pc_acpi_id;             /* ACPI CPU id */               \
  71         /* Pointer to the CPU %fs descriptor */                         \
  72         struct user_segment_descriptor  *pc_fs32p;                      \
  73         /* Pointer to the CPU %gs descriptor */                         \
  74         struct user_segment_descriptor  *pc_gs32p;                      \
  75         /* Pointer to the CPU LDT descriptor */                         \
  76         struct system_segment_descriptor *pc_ldt;                       \
  77         /* Pointer to the CPU TSS descriptor */                         \
  78         struct system_segment_descriptor *pc_tss                        \
  79         PCPU_XEN_FIELDS
  80
  81 #ifdef _KERNEL
  82
  83 #ifdef lint
  84
  85 extern struct pcpu *pcpup;
  86
  87 #define PCPU_GET(member)        (pcpup->pc_ ## member)
  88 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
  89 #define PCPU_INC(member)        PCPU_ADD(member, 1)
  90 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
  91 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
  92
  93 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
  94
  95 /*
  96  * Evaluates to the byte offset of the per-cpu variable name.
  97  */
  98 #define __pcpu_offset(name)                                             \
  99         __offsetof(struct pcpu, name)
 100
 101 /*
 102  * Evaluates to the type of the per-cpu variable name.
 103  */
 104 #define __pcpu_type(name)                                               \
 105         __typeof(((struct pcpu *)0)->name)
 106
 107 /*
 108  * Evaluates to the address of the per-cpu variable name.
 109  */
 110 #define __PCPU_PTR(name) __extension__ ({                               \
 111         __pcpu_type(name) *__p;                                         \
 112                                                                         \
 113         __asm __volatile("movq %%gs:%1,%0; addq %2,%0"                  \
 114             : "=r" (__p)                                                \
 115             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
 116               "i" (__pcpu_offset(name)));                               \
 117                                                                         \
 118         __p;                                                            \
 119 })
 120
 121 /*
 122  * Evaluates to the value of the per-cpu variable name.
 123  */
 124 #define __PCPU_GET(name) __extension__ ({                               \
 125         __pcpu_type(name) __res;                                        \
 126         struct __s {                                                    \
 127                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 128         } __s;                                                          \
 129                                                                         \
 130         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
 131             sizeof(__res) == 4 || sizeof(__res) == 8) {                 \
 132                 __asm __volatile("mov %%gs:%1,%0"                       \
 133                     : "=r" (__s)                                        \
 134                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
 135                 *(struct __s *)(void *)&__res = __s;                    \
 136         } else {                                                        \
 137                 __res = *__PCPU_PTR(name);                              \
 138         }                                                               \
 139         __res;                                                          \
 140 })
 141
 142 /*
 143  * Adds the value to the per-cpu counter name.  The implementation
 144  * must be atomic with respect to interrupts.
 145  */
 146 #define __PCPU_ADD(name, val) do {                                      \
 147         __pcpu_type(name) __val;                                        \
 148         struct __s {                                                    \
 149                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 150         } __s;                                                          \
 151                                                                         \
 152         __val = (val);                                                  \
 153         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 154             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 155                 __s = *(struct __s *)(void *)&__val;                    \
 156                 __asm __volatile("add %1,%%gs:%0"                       \
 157                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 158                     : "r" (__s));                                       \
 159         } else                                                          \
 160                 *__PCPU_PTR(name) += __val;                             \
 161 } while (0)
 162
 163 /*
 164  * Increments the value of the per-cpu counter name.  The implementation
 165  * must be atomic with respect to interrupts.
 166  */
 167 #define __PCPU_INC(name) do {                                           \
 168         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
 169             sizeof(__pcpu_type(name)) == 2 ||                           \
 170             sizeof(__pcpu_type(name)) == 4 ||                           \
 171             sizeof(__pcpu_type(name)) == 8);                            \
 172         if (sizeof(__pcpu_type(name)) == 1) {                           \
 173                 __asm __volatile("incb %%gs:%0"                         \
 174                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 175                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 176         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
 177                 __asm __volatile("incw %%gs:%0"                         \
 178                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 179                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 180         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
 181                 __asm __volatile("incl %%gs:%0"                         \
 182                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 183                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 184         } else if (sizeof(__pcpu_type(name)) == 8) {                    \
 185                 __asm __volatile("incq %%gs:%0"                         \
 186                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 187                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 188         }                                                               \
 189 } while (0)
 190
 191 /*
 192  * Sets the value of the per-cpu variable name to value val.
 193  */
 194 #define __PCPU_SET(name, val) {                                         \
 195         __pcpu_type(name) __val;                                        \
 196         struct __s {                                                    \
 197                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 198         } __s;                                                          \
 199                                                                         \
 200         __val = (val);                                                  \
 201         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 202             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 203                 __s = *(struct __s *)(void *)&__val;                    \
 204                 __asm __volatile("mov %1,%%gs:%0"                       \
 205                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 206                     : "r" (__s));                                       \
 207         } else {                                                        \
 208                 *__PCPU_PTR(name) = __val;                              \
 209         }                                                               \
 210 }
 211
 212 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
 213 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
 214 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
 215 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
 216 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
 217
 218 static __inline struct thread *
 219 __curthread(void)
 220 {
 221         struct thread *td;
 222
 223         __asm __volatile("movq %%gs:0,%0" : "=r" (td));
 224         return (td);
 225 }
 226 #define curthread               (__curthread())
 227
 228 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
 229
 230 #error "this file needs to be ported to your compiler"
 231
 232 #endif /* lint, etc. */
 233
 234 #endif /* _KERNEL */
 235
 236 #endif /* !_MACHINE_PCPU_H_ */