sys/amd64/include/pcpu.h

   1 /*-
   2  * Copyright (c) Peter Wemm <peter@netplex.com.au>
   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 #define PC_PTI_STACK_SZ 16
  37 /*
  38  * The SMP parts are setup in pmap.c and locore.s for the BSP, and
  39  * mp_machdep.c sets up the data for the AP's to "see" when they awake.
  40  * The reason for doing it via a struct is so that an array of pointers
  41  * to each CPU's data can be set up for things like "check curproc on all
  42  * other processors"
  43  */
  44 #define PCPU_MD_FIELDS                                                  \
  45         char    pc_monitorbuf[128] __aligned(128); /* cache line */     \
  46         struct  pcpu *pc_prvspace;      /* Self-reference */            \
  47         struct  pmap *pc_curpmap;                                       \
  48         struct  amd64tss *pc_tssp;      /* TSS segment active on CPU */ \
  49         struct  amd64tss *pc_commontssp;/* Common TSS for the CPU */    \
  50         uint64_t pc_kcr3;                                               \
  51         uint64_t pc_ucr3;                                               \
  52         uint64_t pc_saved_ucr3;                                         \
  53         register_t pc_rsp0;                                             \
  54         register_t pc_scratch_rsp;      /* User %rsp in syscall */      \
  55         register_t pc_scratch_rax;                                      \
  56         u_int   pc_apic_id;                                             \
  57         u_int   pc_acpi_id;             /* ACPI CPU id */               \
  58         /* Pointer to the CPU %fs descriptor */                         \
  59         struct user_segment_descriptor  *pc_fs32p;                      \
  60         /* Pointer to the CPU %gs descriptor */                         \
  61         struct user_segment_descriptor  *pc_gs32p;                      \
  62         /* Pointer to the CPU LDT descriptor */                         \
  63         struct system_segment_descriptor *pc_ldt;                       \
  64         /* Pointer to the CPU TSS descriptor */                         \
  65         struct system_segment_descriptor *pc_tss;                       \
  66         uint64_t        pc_pm_save_cnt;                                 \
  67         u_int   pc_cmci_mask;           /* MCx banks for CMCI */        \
  68         uint64_t pc_dbreg[16];          /* ddb debugging regs */        \
  69         uint64_t pc_pti_stack[PC_PTI_STACK_SZ];                         \
  70         int pc_dbreg_cmd;               /* ddb debugging reg cmd */     \
  71         u_int   pc_vcpu_id;             /* Xen vCPU ID */               \
  72         uint32_t pc_pcid_next;                                          \
  73         uint32_t pc_pcid_gen;                                           \
  74         uint32_t pc_smp_tlb_done;       /* TLB op acknowledgement */    \
  75         uint32_t pc_ibpb_set;                                           \
  76         void    *pc_mds_buf;                                            \
  77         void    *pc_mds_buf64;                                          \
  78         uint32_t pc_pad[20];                                            \
  79         uint8_t pc_mds_tmp[64];                                         \
  80         char    __pad[960]              /* be divisor of PAGE_SIZE      \
  81                                            after cache alignment */
  82
  83 #define PC_DBREG_CMD_NONE       0
  84 #define PC_DBREG_CMD_LOAD       1
  85
  86 #ifdef _KERNEL
  87
  88 #ifdef lint
  89
  90 extern struct pcpu *pcpup;
  91
  92 #define PCPU_GET(member)        (pcpup->pc_ ## member)
  93 #define PCPU_ADD(member, val)   (pcpup->pc_ ## member += (val))
  94 #define PCPU_INC(member)        PCPU_ADD(member, 1)
  95 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
  96 #define PCPU_SET(member, val)   (pcpup->pc_ ## member = (val))
  97
  98 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
  99
 100 /*
 101  * Evaluates to the byte offset of the per-cpu variable name.
 102  */
 103 #define __pcpu_offset(name)                                             \
 104         __offsetof(struct pcpu, name)
 105
 106 /*
 107  * Evaluates to the type of the per-cpu variable name.
 108  */
 109 #define __pcpu_type(name)                                               \
 110         __typeof(((struct pcpu *)0)->name)
 111
 112 /*
 113  * Evaluates to the address of the per-cpu variable name.
 114  */
 115 #define __PCPU_PTR(name) __extension__ ({                               \
 116         __pcpu_type(name) *__p;                                         \
 117                                                                         \
 118         __asm __volatile("movq %%gs:%1,%0; addq %2,%0"                  \
 119             : "=r" (__p)                                                \
 120             : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))),       \
 121               "i" (__pcpu_offset(name)));                               \
 122                                                                         \
 123         __p;                                                            \
 124 })
 125
 126 /*
 127  * Evaluates to the value of the per-cpu variable name.
 128  */
 129 #define __PCPU_GET(name) __extension__ ({                               \
 130         __pcpu_type(name) __res;                                        \
 131         struct __s {                                                    \
 132                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 133         } __s;                                                          \
 134                                                                         \
 135         if (sizeof(__res) == 1 || sizeof(__res) == 2 ||                 \
 136             sizeof(__res) == 4 || sizeof(__res) == 8) {                 \
 137                 __asm __volatile("mov %%gs:%1,%0"                       \
 138                     : "=r" (__s)                                        \
 139                     : "m" (*(struct __s *)(__pcpu_offset(name))));      \
 140                 *(struct __s *)(void *)&__res = __s;                    \
 141         } else {                                                        \
 142                 __res = *__PCPU_PTR(name);                              \
 143         }                                                               \
 144         __res;                                                          \
 145 })
 146
 147 /*
 148  * Adds the value to the per-cpu counter name.  The implementation
 149  * must be atomic with respect to interrupts.
 150  */
 151 #define __PCPU_ADD(name, val) do {                                      \
 152         __pcpu_type(name) __val;                                        \
 153         struct __s {                                                    \
 154                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 155         } __s;                                                          \
 156                                                                         \
 157         __val = (val);                                                  \
 158         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 159             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 160                 __s = *(struct __s *)(void *)&__val;                    \
 161                 __asm __volatile("add %1,%%gs:%0"                       \
 162                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 163                     : "r" (__s));                                       \
 164         } else                                                          \
 165                 *__PCPU_PTR(name) += __val;                             \
 166 } while (0)
 167
 168 /*
 169  * Increments the value of the per-cpu counter name.  The implementation
 170  * must be atomic with respect to interrupts.
 171  */
 172 #define __PCPU_INC(name) do {                                           \
 173         CTASSERT(sizeof(__pcpu_type(name)) == 1 ||                      \
 174             sizeof(__pcpu_type(name)) == 2 ||                           \
 175             sizeof(__pcpu_type(name)) == 4 ||                           \
 176             sizeof(__pcpu_type(name)) == 8);                            \
 177         if (sizeof(__pcpu_type(name)) == 1) {                           \
 178                 __asm __volatile("incb %%gs:%0"                         \
 179                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 180                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 181         } else if (sizeof(__pcpu_type(name)) == 2) {                    \
 182                 __asm __volatile("incw %%gs:%0"                         \
 183                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 184                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 185         } else if (sizeof(__pcpu_type(name)) == 4) {                    \
 186                 __asm __volatile("incl %%gs:%0"                         \
 187                     : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
 188                     : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
 189         } else if (sizeof(__pcpu_type(name)) == 8) {                    \
 190                 __asm __volatile("incq %%gs:%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) {                                         \
 200         __pcpu_type(name) __val;                                        \
 201         struct __s {                                                    \
 202                 u_char  __b[MIN(sizeof(__pcpu_type(name)), 8)];         \
 203         } __s;                                                          \
 204                                                                         \
 205         __val = (val);                                                  \
 206         if (sizeof(__val) == 1 || sizeof(__val) == 2 ||                 \
 207             sizeof(__val) == 4 || sizeof(__val) == 8) {                 \
 208                 __s = *(struct __s *)(void *)&__val;                    \
 209                 __asm __volatile("mov %1,%%gs:%0"                       \
 210                     : "=m" (*(struct __s *)(__pcpu_offset(name)))       \
 211                     : "r" (__s));                                       \
 212         } else {                                                        \
 213                 *__PCPU_PTR(name) = __val;                              \
 214         }                                                               \
 215 }
 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("movq %%gs:%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         32
 243 static __inline __pure2 struct pcb *
 244 __curpcb(void)
 245 {
 246         struct pcb *pcb;
 247
 248         __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
 249         return (pcb);
 250 }
 251 #define curpcb          (__curpcb())
 252
 253 #define IS_BSP()        (PCPU_GET(cpuid) == 0)
 254
 255 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
 256
 257 #error "this file needs to be ported to your compiler"
 258
 259 #endif /* lint, etc. */
 260
 261 #endif /* _KERNEL */
 262
 263 #endif /* !_MACHINE_PCPU_H_ */