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 #include <machine/segments.h>
  39 #include <machine/tss.h>
  40
  41 #define PC_PTI_STACK_SZ 16
  42
  43 struct monitorbuf {
  44         int idle_state;         /* Used by cpu_idle_mwait. */
  45         int stop_state;         /* Used by cpustop_handler. */
  46         char padding[128 - (2 * sizeof(int))];
  47 };
  48 _Static_assert(sizeof(struct monitorbuf) == 128, "2x cache line");
  49
  50 /*
  51  * The SMP parts are setup in pmap.c and locore.s for the BSP, and
  52  * mp_machdep.c sets up the data for the AP's to "see" when they awake.
  53  * The reason for doing it via a struct is so that an array of pointers
  54  * to each CPU's data can be set up for things like "check curproc on all
  55  * other processors"
  56  */
  57 #define PCPU_MD_FIELDS                                                  \
  58         struct monitorbuf pc_monitorbuf __aligned(128); /* cache line */\
  59         struct  pcpu *pc_prvspace;      /* Self-reference */            \
  60         struct  pmap *pc_curpmap;                                       \
  61         struct  amd64tss *pc_tssp;      /* TSS segment active on CPU */ \
  62         void    *pc_pad0;                                               \
  63         uint64_t pc_kcr3;                                               \
  64         uint64_t pc_ucr3;                                               \
  65         uint64_t pc_saved_ucr3;                                         \
  66         register_t pc_rsp0;                                             \
  67         register_t pc_scratch_rsp;      /* User %rsp in syscall */      \
  68         register_t pc_scratch_rax;                                      \
  69         u_int   pc_apic_id;                                             \
  70         u_int   pc_acpi_id;             /* ACPI CPU id */               \
  71         /* Pointer to the CPU %fs descriptor */                         \
  72         struct user_segment_descriptor  *pc_fs32p;                      \
  73         /* Pointer to the CPU %gs descriptor */                         \
  74         struct user_segment_descriptor  *pc_gs32p;                      \
  75         /* Pointer to the CPU LDT descriptor */                         \
  76         struct system_segment_descriptor *pc_ldt;                       \
  77         /* Pointer to the CPU TSS descriptor */                         \
  78         struct system_segment_descriptor *pc_tss;                       \
  79         uint64_t        pc_pm_save_cnt;                                 \
  80         u_int   pc_cmci_mask;           /* MCx banks for CMCI */        \
  81         uint64_t pc_dbreg[16];          /* ddb debugging regs */        \
  82         uint64_t pc_pti_stack[PC_PTI_STACK_SZ];                         \
  83         register_t pc_pti_rsp0;                                         \
  84         int pc_dbreg_cmd;               /* ddb debugging reg cmd */     \
  85         u_int   pc_vcpu_id;             /* Xen vCPU ID */               \
  86         uint32_t pc_pcid_next;                                          \
  87         uint32_t pc_pcid_gen;                                           \
  88         uint32_t pc_smp_tlb_done;       /* TLB op acknowledgement */    \
  89         uint32_t pc_ibpb_set;                                           \
  90         void    *pc_mds_buf;                                            \
  91         void    *pc_mds_buf64;                                          \
  92         uint32_t pc_pad[2];                                             \
  93         uint8_t pc_mds_tmp[64];                                         \
  94         u_int   pc_ipi_bitmap;                                          \
  95         struct amd64tss pc_common_tss;                                  \
  96         struct user_segment_descriptor pc_gdt[NGDT];                    \
  97         char    __pad[2956]             /* pad to UMA_PCPU_ALLOC_SIZE */
  98
  99 #define PC_DBREG_CMD_NONE       0
 100 #define PC_DBREG_CMD_LOAD       1
 101
 102 #ifdef _KERNEL
 103
 104 #define MONITOR_STOPSTATE_RUNNING       0
 105 #define MONITOR_STOPSTATE_STOPPED       1
 106
 107 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
 108
 109 /*
 110  * Evaluates to the byte offset of the per-cpu variable name.
 111  */
 112 #define __pcpu_offset(name)                                             \
 113         __offsetof(struct pcpu, name)
 114
 115 /*
 116  * Evaluates to the type of the per-cpu variable name.
 117  */
 118 #define __pcpu_type(name)                                               \
 119         __typeof(((struct pcpu *)0)->name)
 120
 121 /*
 122  * Evaluates to the address of the per-cpu variable name.
 123  */
 124 #define __PCPU_PTR(name) __extension__ ({                               \
 125         __pcpu_type(name) *__p;                                         \
 126                                                                         \
 127         __asm __volatile("movq %%gs:%1,%0; addq %2,%0"                  \
 128             : "=r" (__p)                                                \
 129             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
 130               "i" (__pcpu_offset(name)));                               \
 131                                                                         \
 132         __p;                                                            \
 133 })
 134
 135 /*
 136  * Evaluates to the value of the per-cpu variable name.
 137  */
 138 #define __PCPU_GET(name) __extension__ ({                               \
 139         __pcpu_type(name) __res;                                        \
 140         struct __s {                                                    \
 141                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 142         } __s;                                                          \
 143                                                                         \
 144         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
 145             sizeof(__res) == 4 || sizeof(__res) == 8) {                 \
 146                 __asm __volatile("mov %%gs:%1,%0"                       \
 147                     : "=r" (__s)                                        \
 148                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
 149                 *(struct __s *)(void *)&__res = __s;                    \
 150         } else {                                                        \
 151                 __res = *__PCPU_PTR(name);                              \
 152         }                                                               \
 153         __res;                                                          \
 154 })
 155
 156 /*
 157  * Adds the value to the per-cpu counter name.  The implementation
 158  * must be atomic with respect to interrupts.
 159  */
 160 #define __PCPU_ADD(name, val) do {                                      \
 161         __pcpu_type(name) __val;                                        \
 162         struct __s {                                                    \
 163                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 164         } __s;                                                          \
 165                                                                         \
 166         __val = (val);                                                  \
 167         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 168             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 169                 __s = *(struct __s *)(void *)&__val;                    \
 170                 __asm __volatile("add %1,%%gs:%0"                       \
 171                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 172                     : "r" (__s));                                       \
 173         } else                                                          \
 174                 *__PCPU_PTR(name) += __val;                             \
 175 } while (0)
 176
 177 /*
 178  * Increments the value of the per-cpu counter name.  The implementation
 179  * must be atomic with respect to interrupts.
 180  */
 181 #define __PCPU_INC(name) do {                                           \
 182         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
 183             sizeof(__pcpu_type(name)) == 2 ||                           \
 184             sizeof(__pcpu_type(name)) == 4 ||                           \
 185             sizeof(__pcpu_type(name)) == 8);                            \
 186         if (sizeof(__pcpu_type(name)) == 1) {                           \
 187                 __asm __volatile("incb %%gs:%0"                         \
 188                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 189                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 190         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
 191                 __asm __volatile("incw %%gs:%0"                         \
 192                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 193                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 194         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
 195                 __asm __volatile("incl %%gs:%0"                         \
 196                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 197                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 198         } else if (sizeof(__pcpu_type(name)) == 8) {                    \
 199                 __asm __volatile("incq %%gs:%0"                         \
 200                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 201                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 202         }                                                               \
 203 } while (0)
 204
 205 /*
 206  * Sets the value of the per-cpu variable name to value val.
 207  */
 208 #define __PCPU_SET(name, val) {                                         \
 209         __pcpu_type(name) __val;                                        \
 210         struct __s {                                                    \
 211                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 212         } __s;                                                          \
 213                                                                         \
 214         __val = (val);                                                  \
 215         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 216             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 217                 __s = *(struct __s *)(void *)&__val;                    \
 218                 __asm __volatile("mov %1,%%gs:%0"                       \
 219                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 220                     : "r" (__s));                                       \
 221         } else {                                                        \
 222                 *__PCPU_PTR(name) = __val;                              \
 223         }                                                               \
 224 }
 225
 226 #define get_pcpu() __extension__ ({                                     \
 227         struct pcpu *__pc;                                              \
 228                                                                         \
 229         __asm __volatile("movq %%gs:%1,%0"                              \
 230             : "=r" (__pc)                                               \
 231             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))));      \
 232         __pc;                                                           \
 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 #define IS_BSP()        (PCPU_GET(cpuid) == 0)
 242
 243 #else /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */
 244
 245 #error "this file needs to be ported to your compiler"
 246
 247 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */
 248
 249 #endif /* _KERNEL */
 250
 251 #endif /* !_MACHINE_PCPU_H_ */