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 #if defined(XENHVM) && !defined(MODXENHVM)
  46 /* This is now unused, but remains here for KBI compatibility reasons. */
  47 #define PCPU_XEN_FIELDS                                                 \
  48         ;                                                               \
  49         unsigned int pc_last_processed_l1i;                             \
  50         unsigned int pc_last_processed_l2i
  51 #else
  52 #define PCPU_XEN_FIELDS
  53 #endif
  54
  55 /*
  56  * The SMP parts are setup in pmap.c and locore.s for the BSP, and
  57  * mp_machdep.c sets up the data for the AP's to "see" when they awake.
  58  * The reason for doing it via a struct is so that an array of pointers
  59  * to each CPU's data can be set up for things like "check curproc on all
  60  * other processors"
  61  */
  62 #define PCPU_MD_FIELDS                                                  \
  63         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
  64         struct  pcpu *pc_prvspace;      /* Self-reference */            \
  65         struct  pmap *pc_curpmap;                                       \
  66         struct  amd64tss *pc_tssp;      /* TSS segment active on CPU */ \
  67         struct  amd64tss *pc_commontssp;/* Common TSS for the CPU */    \
  68         register_t pc_rsp0;                                             \
  69         register_t pc_scratch_rsp;      /* User %rsp in syscall */      \
  70         u_int   pc_apic_id;                                             \
  71         u_int   pc_acpi_id;             /* ACPI CPU id */               \
  72         /* Pointer to the CPU %fs descriptor */                         \
  73         struct user_segment_descriptor  *pc_fs32p;                      \
  74         /* Pointer to the CPU %gs descriptor */                         \
  75         struct user_segment_descriptor  *pc_gs32p;                      \
  76         /* Pointer to the CPU LDT descriptor */                         \
  77         struct system_segment_descriptor *pc_ldt;                       \
  78         /* Pointer to the CPU TSS descriptor */                         \
  79         struct system_segment_descriptor *pc_tss;                       \
  80         u_int   pc_cmci_mask            /* MCx banks for CMCI */        \
  81         PCPU_XEN_FIELDS;                                                \
  82         uint64_t pc_dbreg[16];          /* ddb debugging regs */        \
  83         int pc_dbreg_cmd;               /* ddb debugging reg cmd */     \
  84
  85 #define PC_DBREG_CMD_NONE       0
  86 #define PC_DBREG_CMD_LOAD       1
  87
  88 #ifdef _KERNEL
  89
  90 #ifdef lint
  91
  92 extern struct pcpu *pcpup;
  93
  94 #define PCPU_GET(member)        (pcpup->pc_ ## member)
  95 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
  96 #define PCPU_INC(member)        PCPU_ADD(member, 1)
  97 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
  98 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
  99
 100 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
 101
 102 /*
 103  * Evaluates to the byte offset of the per-cpu variable name.
 104  */
 105 #define __pcpu_offset(name)                                             \
 106         __offsetof(struct pcpu, name)
 107
 108 /*
 109  * Evaluates to the type of the per-cpu variable name.
 110  */
 111 #define __pcpu_type(name)                                               \
 112         __typeof(((struct pcpu *)0)->name)
 113
 114 /*
 115  * Evaluates to the address of the per-cpu variable name.
 116  */
 117 #define __PCPU_PTR(name) __extension__ ({                               \
 118         __pcpu_type(name) *__p;                                         \
 119                                                                         \
 120         __asm __volatile("movq %%gs:%1,%0; addq %2,%0"                  \
 121             : "=r" (__p)                                                \
 122             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
 123               "i" (__pcpu_offset(name)));                               \
 124                                                                         \
 125         __p;                                                            \
 126 })
 127
 128 /*
 129  * Evaluates to the value of the per-cpu variable name.
 130  */
 131 #define __PCPU_GET(name) __extension__ ({                               \
 132         __pcpu_type(name) __res;                                        \
 133         struct __s {                                                    \
 134                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 135         } __s;                                                          \
 136                                                                         \
 137         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
 138             sizeof(__res) == 4 || sizeof(__res) == 8) {                 \
 139                 __asm __volatile("mov %%gs:%1,%0"                       \
 140                     : "=r" (__s)                                        \
 141                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
 142                 *(struct __s *)(void *)&__res = __s;                    \
 143         } else {                                                        \
 144                 __res = *__PCPU_PTR(name);                              \
 145         }                                                               \
 146         __res;                                                          \
 147 })
 148
 149 /*
 150  * Adds the value to the per-cpu counter name.  The implementation
 151  * must be atomic with respect to interrupts.
 152  */
 153 #define __PCPU_ADD(name, val) do {                                      \
 154         __pcpu_type(name) __val;                                        \
 155         struct __s {                                                    \
 156                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 157         } __s;                                                          \
 158                                                                         \
 159         __val = (val);                                                  \
 160         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 161             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 162                 __s = *(struct __s *)(void *)&__val;                    \
 163                 __asm __volatile("add %1,%%gs:%0"                       \
 164                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 165                     : "r" (__s));                                       \
 166         } else                                                          \
 167                 *__PCPU_PTR(name) += __val;                             \
 168 } while (0)
 169
 170 /*
 171  * Increments the value of the per-cpu counter name.  The implementation
 172  * must be atomic with respect to interrupts.
 173  */
 174 #define __PCPU_INC(name) do {                                           \
 175         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
 176             sizeof(__pcpu_type(name)) == 2 ||                           \
 177             sizeof(__pcpu_type(name)) == 4 ||                           \
 178             sizeof(__pcpu_type(name)) == 8);                            \
 179         if (sizeof(__pcpu_type(name)) == 1) {                           \
 180                 __asm __volatile("incb %%gs:%0"                         \
 181                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 182                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 183         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
 184                 __asm __volatile("incw %%gs:%0"                         \
 185                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 186                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 187         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
 188                 __asm __volatile("incl %%gs:%0"                         \
 189                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 190                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 191         } else if (sizeof(__pcpu_type(name)) == 8) {                    \
 192                 __asm __volatile("incq %%gs:%0"                         \
 193                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 194                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 195         }                                                               \
 196 } while (0)
 197
 198 /*
 199  * Sets the value of the per-cpu variable name to value val.
 200  */
 201 #define __PCPU_SET(name, val) {                                         \
 202         __pcpu_type(name) __val;                                        \
 203         struct __s {                                                    \
 204                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 205         } __s;                                                          \
 206                                                                         \
 207         __val = (val);                                                  \
 208         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 209             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 210                 __s = *(struct __s *)(void *)&__val;                    \
 211                 __asm __volatile("mov %1,%%gs:%0"                       \
 212                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 213                     : "r" (__s));                                       \
 214         } else {                                                        \
 215                 *__PCPU_PTR(name) = __val;                              \
 216         }                                                               \
 217 }
 218
 219 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
 220 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
 221 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
 222 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
 223 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
 224
 225 #define OFFSETOF_CURTHREAD      0
 226 #ifdef __clang__
 227 #pragma clang diagnostic push
 228 #pragma clang diagnostic ignored "-Wnull-dereference"
 229 #endif
 230 static __inline __pure2 struct thread *
 231 __curthread(void)
 232 {
 233         struct thread *td;
 234
 235         __asm("movq %%gs:%1,%0" : "=r" (td)
 236             : "m" (*(char *)OFFSETOF_CURTHREAD));
 237         return (td);
 238 }
 239 #ifdef __clang__
 240 #pragma clang diagnostic pop
 241 #endif
 242 #define curthread               (__curthread())
 243
 244 #define OFFSETOF_CURPCB         32
 245 static __inline __pure2 struct pcb *
 246 __curpcb(void)
 247 {
 248         struct pcb *pcb;
 249
 250         __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
 251         return (pcb);
 252 }
 253 #define curpcb          (__curpcb())
 254
 255 #define IS_BSP()        (PCPU_GET(cpuid) == 0)
 256
 257 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
 258
 259 #error "this file needs to be ported to your compiler"
 260
 261 #endif /* lint, etc. */
 262
 263 #endif /* _KERNEL */
 264
 265 #endif /* !_MACHINE_PCPU_H_ */