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