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