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         u_int   pc_cmci_mask            /* MCx banks for CMCI */        \
  80         PCPU_XEN_FIELDS
  81
  82 #ifdef _KERNEL
  83
  84 #ifdef lint
  85
  86 extern struct pcpu *pcpup;
  87
  88 #define PCPU_GET(member)        (pcpup->pc_ ## member)
  89 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
  90 #define PCPU_INC(member)        PCPU_ADD(member, 1)
  91 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
  92 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
  93
  94 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
  95
  96 /*
  97  * Evaluates to the byte offset of the per-cpu variable name.
  98  */
  99 #define __pcpu_offset(name)                                             \
 100         __offsetof(struct pcpu, name)
 101
 102 /*
 103  * Evaluates to the type of the per-cpu variable name.
 104  */
 105 #define __pcpu_type(name)                                               \
 106         __typeof(((struct pcpu *)0)->name)
 107
 108 /*
 109  * Evaluates to the address of the per-cpu variable name.
 110  */
 111 #define __PCPU_PTR(name) __extension__ ({                               \
 112         __pcpu_type(name) *__p;                                         \
 113                                                                         \
 114         __asm __volatile("movq %%gs:%1,%0; addq %2,%0"                  \
 115             : "=r" (__p)                                                \
 116             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
 117               "i" (__pcpu_offset(name)));                               \
 118                                                                         \
 119         __p;                                                            \
 120 })
 121
 122 /*
 123  * Evaluates to the value of the per-cpu variable name.
 124  */
 125 #define __PCPU_GET(name) __extension__ ({                               \
 126         __pcpu_type(name) __res;                                        \
 127         struct __s {                                                    \
 128                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 129         } __s;                                                          \
 130                                                                         \
 131         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
 132             sizeof(__res) == 4 || sizeof(__res) == 8) {                 \
 133                 __asm __volatile("mov %%gs:%1,%0"                       \
 134                     : "=r" (__s)                                        \
 135                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
 136                 *(struct __s *)(void *)&__res = __s;                    \
 137         } else {                                                        \
 138                 __res = *__PCPU_PTR(name);                              \
 139         }                                                               \
 140         __res;                                                          \
 141 })
 142
 143 /*
 144  * Adds the value to the per-cpu counter name.  The implementation
 145  * must be atomic with respect to interrupts.
 146  */
 147 #define __PCPU_ADD(name, val) do {                                      \
 148         __pcpu_type(name) __val;                                        \
 149         struct __s {                                                    \
 150                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 151         } __s;                                                          \
 152                                                                         \
 153         __val = (val);                                                  \
 154         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 155             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 156                 __s = *(struct __s *)(void *)&__val;                    \
 157                 __asm __volatile("add %1,%%gs:%0"                       \
 158                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 159                     : "r" (__s));                                       \
 160         } else                                                          \
 161                 *__PCPU_PTR(name) += __val;                             \
 162 } while (0)
 163
 164 /*
 165  * Increments the value of the per-cpu counter name.  The implementation
 166  * must be atomic with respect to interrupts.
 167  */
 168 #define __PCPU_INC(name) do {                                           \
 169         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
 170             sizeof(__pcpu_type(name)) == 2 ||                           \
 171             sizeof(__pcpu_type(name)) == 4 ||                           \
 172             sizeof(__pcpu_type(name)) == 8);                            \
 173         if (sizeof(__pcpu_type(name)) == 1) {                           \
 174                 __asm __volatile("incb %%gs:%0"                         \
 175                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 176                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 177         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
 178                 __asm __volatile("incw %%gs:%0"                         \
 179                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 180                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 181         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
 182                 __asm __volatile("incl %%gs:%0"                         \
 183                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 184                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 185         } else if (sizeof(__pcpu_type(name)) == 8) {                    \
 186                 __asm __volatile("incq %%gs:%0"                         \
 187                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 188                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 189         }                                                               \
 190 } while (0)
 191
 192 /*
 193  * Sets the value of the per-cpu variable name to value val.
 194  */
 195 #define __PCPU_SET(name, val) {                                         \
 196         __pcpu_type(name) __val;                                        \
 197         struct __s {                                                    \
 198                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 199         } __s;                                                          \
 200                                                                         \
 201         __val = (val);                                                  \
 202         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 203             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 204                 __s = *(struct __s *)(void *)&__val;                    \
 205                 __asm __volatile("mov %1,%%gs:%0"                       \
 206                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 207                     : "r" (__s));                                       \
 208         } else {                                                        \
 209                 *__PCPU_PTR(name) = __val;                              \
 210         }                                                               \
 211 }
 212
 213 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
 214 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
 215 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
 216 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
 217 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
 218
 219 static __inline __pure2 struct thread *
 220 __curthread(void)
 221 {
 222         struct thread *td;
 223
 224         __asm("movq %%gs:0,%0" : "=r" (td));
 225         return (td);
 226 }
 227 #define curthread               (__curthread())
 228
 229 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
 230
 231 #error "this file needs to be ported to your compiler"
 232
 233 #endif /* lint, etc. */
 234
 235 #endif /* _KERNEL */
 236
 237 #endif /* !_MACHINE_PCPU_H_ */