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         uint64_t pc_dbreg[16];          /* ddb debugging regs */        \
  82         int pc_dbreg_cmd;               /* ddb debugging reg cmd */     \
  83
  84 #define PC_DBREG_CMD_NONE       0
  85 #define PC_DBREG_CMD_LOAD       1
  86
  87 #ifdef _KERNEL
  88
  89 #ifdef lint
  90
  91 extern struct pcpu *pcpup;
  92
  93 #define PCPU_GET(member)        (pcpup->pc_ ## member)
  94 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
  95 #define PCPU_INC(member)        PCPU_ADD(member, 1)
  96 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
  97 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
  98
  99 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
 100
 101 /*
 102  * Evaluates to the byte offset of the per-cpu variable name.
 103  */
 104 #define __pcpu_offset(name)                                             \
 105         __offsetof(struct pcpu, name)
 106
 107 /*
 108  * Evaluates to the type of the per-cpu variable name.
 109  */
 110 #define __pcpu_type(name)                                               \
 111         __typeof(((struct pcpu *)0)->name)
 112
 113 /*
 114  * Evaluates to the address of the per-cpu variable name.
 115  */
 116 #define __PCPU_PTR(name) __extension__ ({                               \
 117         __pcpu_type(name) *__p;                                         \
 118                                                                         \
 119         __asm __volatile("movq %%gs:%1,%0; addq %2,%0"                  \
 120             : "=r" (__p)                                                \
 121             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
 122               "i" (__pcpu_offset(name)));                               \
 123                                                                         \
 124         __p;                                                            \
 125 })
 126
 127 /*
 128  * Evaluates to the value of the per-cpu variable name.
 129  */
 130 #define __PCPU_GET(name) __extension__ ({                               \
 131         __pcpu_type(name) __res;                                        \
 132         struct __s {                                                    \
 133                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 134         } __s;                                                          \
 135                                                                         \
 136         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
 137             sizeof(__res) == 4 || sizeof(__res) == 8) {                 \
 138                 __asm __volatile("mov %%gs:%1,%0"                       \
 139                     : "=r" (__s)                                        \
 140                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
 141                 *(struct __s *)(void *)&__res = __s;                    \
 142         } else {                                                        \
 143                 __res = *__PCPU_PTR(name);                              \
 144         }                                                               \
 145         __res;                                                          \
 146 })
 147
 148 /*
 149  * Adds the value to the per-cpu counter name.  The implementation
 150  * must be atomic with respect to interrupts.
 151  */
 152 #define __PCPU_ADD(name, val) do {                                      \
 153         __pcpu_type(name) __val;                                        \
 154         struct __s {                                                    \
 155                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 156         } __s;                                                          \
 157                                                                         \
 158         __val = (val);                                                  \
 159         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 160             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 161                 __s = *(struct __s *)(void *)&__val;                    \
 162                 __asm __volatile("add %1,%%gs:%0"                       \
 163                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 164                     : "r" (__s));                                       \
 165         } else                                                          \
 166                 *__PCPU_PTR(name) += __val;                             \
 167 } while (0)
 168
 169 /*
 170  * Increments the value of the per-cpu counter name.  The implementation
 171  * must be atomic with respect to interrupts.
 172  */
 173 #define __PCPU_INC(name) do {                                           \
 174         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
 175             sizeof(__pcpu_type(name)) == 2 ||                           \
 176             sizeof(__pcpu_type(name)) == 4 ||                           \
 177             sizeof(__pcpu_type(name)) == 8);                            \
 178         if (sizeof(__pcpu_type(name)) == 1) {                           \
 179                 __asm __volatile("incb %%gs:%0"                         \
 180                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 181                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 182         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
 183                 __asm __volatile("incw %%gs:%0"                         \
 184                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 185                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 186         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
 187                 __asm __volatile("incl %%gs:%0"                         \
 188                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 189                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 190         } else if (sizeof(__pcpu_type(name)) == 8) {                    \
 191                 __asm __volatile("incq %%gs:%0"                         \
 192                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 193                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 194         }                                                               \
 195 } while (0)
 196
 197 /*
 198  * Sets the value of the per-cpu variable name to value val.
 199  */
 200 #define __PCPU_SET(name, val) {                                         \
 201         __pcpu_type(name) __val;                                        \
 202         struct __s {                                                    \
 203                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 204         } __s;                                                          \
 205                                                                         \
 206         __val = (val);                                                  \
 207         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 208             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 209                 __s = *(struct __s *)(void *)&__val;                    \
 210                 __asm __volatile("mov %1,%%gs:%0"                       \
 211                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 212                     : "r" (__s));                                       \
 213         } else {                                                        \
 214                 *__PCPU_PTR(name) = __val;                              \
 215         }                                                               \
 216 }
 217
 218 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
 219 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
 220 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
 221 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
 222 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
 223
 224 #define OFFSETOF_CURTHREAD      0
 225 #ifdef __clang__
 226 #pragma clang diagnostic push
 227 #pragma clang diagnostic ignored "-Wnull-dereference"
 228 #endif
 229 static __inline __pure2 struct thread *
 230 __curthread(void)
 231 {
 232         struct thread *td;
 233
 234         __asm("movq %%gs:%1,%0" : "=r" (td)
 235             : "m" (*(char *)OFFSETOF_CURTHREAD));
 236         return (td);
 237 }
 238 #ifdef __clang__
 239 #pragma clang diagnostic pop
 240 #endif
 241 #define curthread               (__curthread())
 242
 243 #define OFFSETOF_CURPCB         32
 244 static __inline __pure2 struct pcb *
 245 __curpcb(void)
 246 {
 247         struct pcb *pcb;
 248
 249         __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
 250         return (pcb);
 251 }
 252 #define curpcb          (__curpcb())
 253
 254 #define IS_BSP()        (PCPU_GET(cpuid) == 0)
 255
 256 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
 257
 258 #error "this file needs to be ported to your compiler"
 259
 260 #endif /* lint, etc. */
 261
 262 #endif /* _KERNEL */
 263
 264 #endif /* !_MACHINE_PCPU_H_ */