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