sys/amd64/include/pcpu.h

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) Peter Wemm <peter@netplex.com.au>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD$
  29  */
  30
  31 #ifndef _MACHINE_PCPU_H_
  32 #define _MACHINE_PCPU_H_
  33
  34 #ifndef _SYS_CDEFS_H_
  35 #error "sys/cdefs.h is a prerequisite for this file"
  36 #endif
  37
  38 #define PC_PTI_STACK_SZ 16
  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 #define PCPU_MD_FIELDS                                                  \
  47         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
  48         struct  pcpu *pc_prvspace;      /* Self-reference */            \
  49         struct  pmap *pc_curpmap;                                       \
  50         struct  amd64tss *pc_tssp;      /* TSS segment active on CPU */ \
  51         struct  amd64tss *pc_commontssp;/* Common TSS for the CPU */    \
  52         uint64_t pc_kcr3;                                               \
  53         uint64_t pc_ucr3;                                               \
  54         uint64_t pc_saved_ucr3;                                         \
  55         register_t pc_rsp0;                                             \
  56         register_t pc_scratch_rsp;      /* User %rsp in syscall */      \
  57         register_t pc_scratch_rax;                                      \
  58         u_int   pc_apic_id;                                             \
  59         u_int   pc_acpi_id;             /* ACPI CPU id */               \
  60         /* Pointer to the CPU %fs descriptor */                         \
  61         struct user_segment_descriptor  *pc_fs32p;                      \
  62         /* Pointer to the CPU %gs descriptor */                         \
  63         struct user_segment_descriptor  *pc_gs32p;                      \
  64         /* Pointer to the CPU LDT descriptor */                         \
  65         struct system_segment_descriptor *pc_ldt;                       \
  66         /* Pointer to the CPU TSS descriptor */                         \
  67         struct system_segment_descriptor *pc_tss;                       \
  68         uint64_t        pc_pm_save_cnt;                                 \
  69         u_int   pc_cmci_mask;           /* MCx banks for CMCI */        \
  70         uint64_t pc_dbreg[16];          /* ddb debugging regs */        \
  71         uint64_t pc_pti_stack[PC_PTI_STACK_SZ];                         \
  72         register_t pc_pti_rsp0;                                         \
  73         int pc_dbreg_cmd;               /* ddb debugging reg cmd */     \
  74         u_int   pc_vcpu_id;             /* Xen vCPU ID */               \
  75         uint32_t pc_pcid_next;                                          \
  76         uint32_t pc_pcid_gen;                                           \
  77         uint32_t pc_smp_tlb_done;       /* TLB op acknowledgement */    \
  78         uint32_t pc_ibpb_set;                                           \
  79         char    __pad[216]              /* be divisor of PAGE_SIZE      \
  80                                            after cache alignment */
  81
  82 #define PC_DBREG_CMD_NONE       0
  83 #define PC_DBREG_CMD_LOAD       1
  84
  85 #ifdef _KERNEL
  86
  87 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
  88
  89 /*
  90  * Evaluates to the byte offset of the per-cpu variable name.
  91  */
  92 #define __pcpu_offset(name)                                             \
  93         __offsetof(struct pcpu, name)
  94
  95 /*
  96  * Evaluates to the type of the per-cpu variable name.
  97  */
  98 #define __pcpu_type(name)                                               \
  99         __typeof(((struct pcpu *)0)->name)
 100
 101 /*
 102  * Evaluates to the address of the per-cpu variable name.
 103  */
 104 #define __PCPU_PTR(name) __extension__ ({                               \
 105         __pcpu_type(name) *__p;                                         \
 106                                                                         \
 107         __asm __volatile("movq %%gs:%1,%0; addq %2,%0"                  \
 108             : "=r" (__p)                                                \
 109             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
 110               "i" (__pcpu_offset(name)));                               \
 111                                                                         \
 112         __p;                                                            \
 113 })
 114
 115 /*
 116  * Evaluates to the value of the per-cpu variable name.
 117  */
 118 #define __PCPU_GET(name) __extension__ ({                               \
 119         __pcpu_type(name) __res;                                        \
 120         struct __s {                                                    \
 121                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 122         } __s;                                                          \
 123                                                                         \
 124         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
 125             sizeof(__res) == 4 || sizeof(__res) == 8) {                 \
 126                 __asm __volatile("mov %%gs:%1,%0"                       \
 127                     : "=r" (__s)                                        \
 128                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
 129                 *(struct __s *)(void *)&__res = __s;                    \
 130         } else {                                                        \
 131                 __res = *__PCPU_PTR(name);                              \
 132         }                                                               \
 133         __res;                                                          \
 134 })
 135
 136 /*
 137  * Adds the value to the per-cpu counter name.  The implementation
 138  * must be atomic with respect to interrupts.
 139  */
 140 #define __PCPU_ADD(name, val) do {                                      \
 141         __pcpu_type(name) __val;                                        \
 142         struct __s {                                                    \
 143                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 144         } __s;                                                          \
 145                                                                         \
 146         __val = (val);                                                  \
 147         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 148             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 149                 __s = *(struct __s *)(void *)&__val;                    \
 150                 __asm __volatile("add %1,%%gs:%0"                       \
 151                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 152                     : "r" (__s));                                       \
 153         } else                                                          \
 154                 *__PCPU_PTR(name) += __val;                             \
 155 } while (0)
 156
 157 /*
 158  * Increments the value of the per-cpu counter name.  The implementation
 159  * must be atomic with respect to interrupts.
 160  */
 161 #define __PCPU_INC(name) do {                                           \
 162         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
 163             sizeof(__pcpu_type(name)) == 2 ||                           \
 164             sizeof(__pcpu_type(name)) == 4 ||                           \
 165             sizeof(__pcpu_type(name)) == 8);                            \
 166         if (sizeof(__pcpu_type(name)) == 1) {                           \
 167                 __asm __volatile("incb %%gs:%0"                         \
 168                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 169                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 170         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
 171                 __asm __volatile("incw %%gs:%0"                         \
 172                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 173                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 174         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
 175                 __asm __volatile("incl %%gs:%0"                         \
 176                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 177                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 178         } else if (sizeof(__pcpu_type(name)) == 8) {                    \
 179                 __asm __volatile("incq %%gs:%0"                         \
 180                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 181                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 182         }                                                               \
 183 } while (0)
 184
 185 /*
 186  * Sets the value of the per-cpu variable name to value val.
 187  */
 188 #define __PCPU_SET(name, val) {                                         \
 189         __pcpu_type(name) __val;                                        \
 190         struct __s {                                                    \
 191                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 192         } __s;                                                          \
 193                                                                         \
 194         __val = (val);                                                  \
 195         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 196             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 197                 __s = *(struct __s *)(void *)&__val;                    \
 198                 __asm __volatile("mov %1,%%gs:%0"                       \
 199                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 200                     : "r" (__s));                                       \
 201         } else {                                                        \
 202                 *__PCPU_PTR(name) = __val;                              \
 203         }                                                               \
 204 }
 205
 206 #define get_pcpu() __extension__ ({                                     \
 207         struct pcpu *__pc;                                              \
 208                                                                         \
 209         __asm __volatile("movq %%gs:%1,%0"                              \
 210             : "=r" (__pc)                                               \
 211             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))));      \
 212         __pc;                                                           \
 213 })
 214
 215 #define PCPU_GET(member)        __PCPU_GET(pc_ ## member)
 216 #define PCPU_ADD(member, val)   __PCPU_ADD(pc_ ## member, val)
 217 #define PCPU_INC(member)        __PCPU_INC(pc_ ## member)
 218 #define PCPU_PTR(member)        __PCPU_PTR(pc_ ## member)
 219 #define PCPU_SET(member, val)   __PCPU_SET(pc_ ## member, val)
 220
 221 #define OFFSETOF_CURTHREAD      0
 222 #ifdef __clang__
 223 #pragma clang diagnostic push
 224 #pragma clang diagnostic ignored "-Wnull-dereference"
 225 #endif
 226 static __inline __pure2 struct thread *
 227 __curthread(void)
 228 {
 229         struct thread *td;
 230
 231         __asm("movq %%gs:%1,%0" : "=r" (td)
 232             : "m" (*(char *)OFFSETOF_CURTHREAD));
 233         return (td);
 234 }
 235 #ifdef __clang__
 236 #pragma clang diagnostic pop
 237 #endif
 238 #define curthread               (__curthread())
 239
 240 #define OFFSETOF_CURPCB         32
 241 static __inline __pure2 struct pcb *
 242 __curpcb(void)
 243 {
 244         struct pcb *pcb;
 245
 246         __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
 247         return (pcb);
 248 }
 249 #define curpcb          (__curpcb())
 250
 251 #define IS_BSP()        (PCPU_GET(cpuid) == 0)
 252
 253 #else /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */
 254
 255 #error "this file needs to be ported to your compiler"
 256
 257 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */
 258
 259 #endif /* _KERNEL */
 260
 261 #endif /* !_MACHINE_PCPU_H_ */