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