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 #if defined(XEN) || defined(XENHVM)
  48 #ifndef NR_VIRQS
  49 #define NR_VIRQS        24
  50 #endif
  51 #ifndef NR_IPIS
  52 #define NR_IPIS         2
  53 #endif
  54 #endif
  55
  56 #if defined(XEN)
  57
  58 /* These are peridically updated in shared_info, and then copied here. */
  59 struct shadow_time_info {
  60         uint64_t tsc_timestamp;     /* TSC at last update of time vals.  */
  61         uint64_t system_timestamp;  /* Time, in nanosecs, since boot.    */
  62         uint32_t tsc_to_nsec_mul;
  63         uint32_t tsc_to_usec_mul;
  64         int tsc_shift;
  65         uint32_t version;
  66 };
  67
  68 #define PCPU_XEN_FIELDS                                                 \
  69         ;                                                               \
  70         u_int   pc_cr3;         /* track cr3 for R1/R3*/                \
  71         vm_paddr_t *pc_pdir_shadow;                                     \
  72         uint64_t pc_processed_system_time;                              \
  73         struct shadow_time_info pc_shadow_time;                         \
  74         int     pc_resched_irq;                                         \
  75         int     pc_callfunc_irq;                                        \
  76         int     pc_virq_to_irq[NR_VIRQS];                               \
  77         int     pc_ipi_to_irq[NR_IPIS]
  78
  79 #elif defined(XENHVM) && !defined(MODXENHVM)
  80
  81 /* This is now unused, but remains here for KBI compatibility reasons. */
  82 #define PCPU_XEN_FIELDS                                                 \
  83         ;                                                               \
  84         unsigned int pc_last_processed_l1i;                             \
  85         unsigned int pc_last_processed_l2i
  86
  87 #else /* !XEN && (!XENHVM || MODXENHVM) */
  88
  89 #define PCPU_XEN_FIELDS
  90
  91 #endif
  92
  93 #define PCPU_MD_FIELDS                                                  \
  94         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
  95         struct  pcpu *pc_prvspace;      /* Self-reference */            \
  96         struct  pmap *pc_curpmap;                                       \
  97         struct  i386tss pc_common_tss;                                  \
  98         struct  segment_descriptor pc_common_tssd;                      \
  99         struct  segment_descriptor *pc_tss_gdt;                         \
 100         struct  segment_descriptor *pc_fsgs_gdt;                        \
 101         int     pc_currentldt;                                          \
 102         u_int   pc_acpi_id;             /* ACPI CPU id */               \
 103         u_int   pc_apic_id;                                             \
 104         int     pc_private_tss;         /* Flag indicating private tss*/\
 105         u_int   pc_cmci_mask            /* MCx banks for CMCI */        \
 106         PCPU_XEN_FIELDS
 107
 108 #ifdef _KERNEL
 109
 110 #ifdef lint
 111
 112 extern struct pcpu *pcpup;
 113
 114 #define PCPU_GET(member)        (pcpup->pc_ ## member)
 115 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
 116 #define PCPU_INC(member)        PCPU_ADD(member, 1)
 117 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
 118 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
 119
 120 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
 121
 122 /*
 123  * Evaluates to the byte offset of the per-cpu variable name.
 124  */
 125 #define __pcpu_offset(name)                                             \
 126         __offsetof(struct pcpu, name)
 127
 128 /*
 129  * Evaluates to the type of the per-cpu variable name.
 130  */
 131 #define __pcpu_type(name)                                               \
 132         __typeof(((struct pcpu *)0)->name)
 133
 134 /*
 135  * Evaluates to the address of the per-cpu variable name.
 136  */
 137 #define __PCPU_PTR(name) __extension__ ({                               \
 138         __pcpu_type(name) *__p;                                         \
 139                                                                         \
 140         __asm __volatile("movl %%fs:%1,%0; addl %2,%0"                  \
 141             : "=r" (__p)                                                \
 142             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
 143               "i" (__pcpu_offset(name)));                               \
 144                                                                         \
 145         __p;                                                            \
 146 })
 147
 148 /*
 149  * Evaluates to the value of the per-cpu variable name.
 150  */
 151 #define __PCPU_GET(name) __extension__ ({                               \
 152         __pcpu_type(name) __res;                                        \
 153         struct __s {                                                    \
 154                 u_char  __b[MIN(sizeof(__res), 4)];                     \
 155         } __s;                                                          \
 156                                                                         \
 157         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
 158             sizeof(__res) == 4) {                                       \
 159                 __asm __volatile("mov %%fs:%1,%0"                       \
 160                     : "=r" (__s)                                        \
 161                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
 162                 *(struct __s *)(void *)&__res = __s;                    \
 163         } else {                                                        \
 164                 __res = *__PCPU_PTR(name);                              \
 165         }                                                               \
 166         __res;                                                          \
 167 })
 168
 169 /*
 170  * Adds a value of the per-cpu counter name.  The implementation
 171  * must be atomic with respect to interrupts.
 172  */
 173 #define __PCPU_ADD(name, val) do {                                      \
 174         __pcpu_type(name) __val;                                        \
 175         struct __s {                                                    \
 176                 u_char  __b[MIN(sizeof(__val), 4)];                     \
 177         } __s;                                                          \
 178                                                                         \
 179         __val = (val);                                                  \
 180         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 181             sizeof(__val) == 4) {                                       \
 182                 __s = *(struct __s *)(void *)&__val;                    \
 183                 __asm __volatile("add %1,%%fs:%0"                       \
 184                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 185                     : "r" (__s));                                       \
 186         } else                                                          \
 187                 *__PCPU_PTR(name) += __val;                             \
 188 } while (0)
 189
 190 /*
 191  * Increments the value of the per-cpu counter name.  The implementation
 192  * must be atomic with respect to interrupts.
 193  */
 194 #define __PCPU_INC(name) do {                                           \
 195         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
 196             sizeof(__pcpu_type(name)) == 2 ||                           \
 197             sizeof(__pcpu_type(name)) == 4);                            \
 198         if (sizeof(__pcpu_type(name)) == 1) {                           \
 199                 __asm __volatile("incb %%fs:%0"                         \
 200                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 201                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 202         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
 203                 __asm __volatile("incw %%fs:%0"                         \
 204                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 205                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 206         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
 207                 __asm __volatile("incl %%fs:%0"                         \
 208                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 209                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 210         }                                                               \
 211 } while (0)
 212
 213 /*
 214  * Sets the value of the per-cpu variable name to value val.
 215  */
 216 #define __PCPU_SET(name, val) do {                                      \
 217         __pcpu_type(name) __val;                                        \
 218         struct __s {                                                    \
 219                 u_char  __b[MIN(sizeof(__val), 4)];                     \
 220         } __s;                                                          \
 221                                                                         \
 222         __val = (val);                                                  \
 223         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 224             sizeof(__val) == 4) {                                       \
 225                 __s = *(struct __s *)(void *)&__val;                    \
 226                 __asm __volatile("mov %1,%%fs:%0"                       \
 227                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 228                     : "r" (__s));                                       \
 229         } else {                                                        \
 230                 *__PCPU_PTR(name) = __val;                              \
 231         }                                                               \
 232 } while (0)
 233
 234 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
 235 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
 236 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
 237 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
 238 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
 239
 240 #define OFFSETOF_CURTHREAD      0
 241 #ifdef __clang__
 242 #pragma clang diagnostic push
 243 #pragma clang diagnostic ignored "-Wnull-dereference"
 244 #endif
 245 static __inline __pure2 struct thread *
 246 __curthread(void)
 247 {
 248         struct thread *td;
 249
 250         __asm("movl %%fs:%1,%0" : "=r" (td)
 251             : "m" (*(char *)OFFSETOF_CURTHREAD));
 252         return (td);
 253 }
 254 #ifdef __clang__
 255 #pragma clang diagnostic pop
 256 #endif
 257 #define curthread               (__curthread())
 258
 259 #define OFFSETOF_CURPCB         16
 260 static __inline __pure2 struct pcb *
 261 __curpcb(void)
 262 {
 263         struct pcb *pcb;
 264
 265         __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
 266         return (pcb);
 267 }
 268 #define curpcb          (__curpcb())
 269
 270 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
 271
 272 #error "this file needs to be ported to your compiler"
 273
 274 #endif /* lint, etc. */
 275
 276 #endif /* _KERNEL */
 277
 278 #endif /* !_MACHINE_PCPU_H_ */