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 #if defined(XEN) || defined(XENHVM) 37 #ifndef NR_VIRQS 38 #define NR_VIRQS 24 39 #endif 40 #ifndef NR_IPIS 41 #define NR_IPIS 2 42 #endif 43 #endif 44 45 #ifdef XENHVM 46 #define PCPU_XEN_FIELDS \ 47 ; \ 48 unsigned int pc_last_processed_l1i; \ 49 unsigned int pc_last_processed_l2i 50 #else 51 #define PCPU_XEN_FIELDS 52 #endif 53 54 /* 55 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 56 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 57 * The reason for doing it via a struct is so that an array of pointers 58 * to each CPU's data can be set up for things like "check curproc on all 59 * other processors" 60 */ 61 #define PCPU_MD_FIELDS \ 62 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 63 struct pcpu *pc_prvspace; /* Self-reference */ \ 64 struct pmap *pc_curpmap; \ 65 struct amd64tss *pc_tssp; \ 66 register_t pc_rsp0; \ 67 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 68 u_int pc_apic_id; \ 69 u_int pc_acpi_id; /* ACPI CPU id */ \ 70 struct user_segment_descriptor *pc_gs32p \ 71 PCPU_XEN_FIELDS 72 73 #ifdef _KERNEL 74 75 #ifdef lint 76 77 extern struct pcpu *pcpup; 78 79 #define PCPU_GET(member) (pcpup->pc_ ## member) 80 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 81 #define PCPU_INC(member) PCPU_ADD(member, 1) 82 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 83 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 84 85 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 86 87 /* 88 * Evaluates to the byte offset of the per-cpu variable name. 89 */ 90 #define __pcpu_offset(name) \ 91 __offsetof(struct pcpu, name) 92 93 /* 94 * Evaluates to the type of the per-cpu variable name. 95 */ 96 #define __pcpu_type(name) \ 97 __typeof(((struct pcpu *)0)->name) 98 99 /* 100 * Evaluates to the address of the per-cpu variable name. 101 */ 102 #define __PCPU_PTR(name) __extension__ ({ \ 103 __pcpu_type(name) *__p; \ 104 \ 105 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 106 : "=r" (__p) \ 107 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 108 "i" (__pcpu_offset(name))); \ 109 \ 110 __p; \ 111 }) 112 113 /* 114 * Evaluates to the value of the per-cpu variable name. 115 */ 116 #define __PCPU_GET(name) __extension__ ({ \ 117 __pcpu_type(name) __res; \ 118 struct __s { \ 119 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 120 } __s; \ 121 \ 122 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 123 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 124 __asm __volatile("mov %%gs:%1,%0" \ 125 : "=r" (__s) \ 126 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 127 *(struct __s *)(void *)&__res = __s; \ 128 } else { \ 129 __res = *__PCPU_PTR(name); \ 130 } \ 131 __res; \ 132 }) 133 134 /* 135 * Adds the value to the per-cpu counter name. The implementation 136 * must be atomic with respect to interrupts. 137 */ 138 #define __PCPU_ADD(name, val) do { \ 139 __pcpu_type(name) __val; \ 140 struct __s { \ 141 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 142 } __s; \ 143 \ 144 __val = (val); \ 145 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 146 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 147 __s = *(struct __s *)(void *)&__val; \ 148 __asm __volatile("add %1,%%gs:%0" \ 149 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 150 : "r" (__s)); \ 151 } else \ 152 *__PCPU_PTR(name) += __val; \ 153 } while (0) 154 155 /* 156 * Increments the value of the per-cpu counter name. The implementation 157 * must be atomic with respect to interrupts. 158 */ 159 #define __PCPU_INC(name) do { \ 160 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 161 sizeof(__pcpu_type(name)) == 2 || \ 162 sizeof(__pcpu_type(name)) == 4 || \ 163 sizeof(__pcpu_type(name)) == 8); \ 164 if (sizeof(__pcpu_type(name)) == 1) { \ 165 __asm __volatile("incb %%gs:%0" \ 166 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 167 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 168 } else if (sizeof(__pcpu_type(name)) == 2) { \ 169 __asm __volatile("incw %%gs:%0" \ 170 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 171 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 172 } else if (sizeof(__pcpu_type(name)) == 4) { \ 173 __asm __volatile("incl %%gs:%0" \ 174 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 175 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 176 } else if (sizeof(__pcpu_type(name)) == 8) { \ 177 __asm __volatile("incq %%gs:%0" \ 178 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 179 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 180 } \ 181 } while (0) 182 183 /* 184 * Sets the value of the per-cpu variable name to value val. 185 */ 186 #define __PCPU_SET(name, val) { \ 187 __pcpu_type(name) __val; \ 188 struct __s { \ 189 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 190 } __s; \ 191 \ 192 __val = (val); \ 193 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 194 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 195 __s = *(struct __s *)(void *)&__val; \ 196 __asm __volatile("mov %1,%%gs:%0" \ 197 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 198 : "r" (__s)); \ 199 } else { \ 200 *__PCPU_PTR(name) = __val; \ 201 } \ 202 } 203 204 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 205 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 206 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 207 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 208 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 209 210 static __inline struct thread * 211 __curthread(void) 212 { 213 struct thread *td; 214 215 __asm __volatile("movq %%gs:0,%0" : "=r" (td)); 216 return (td); 217 } 218 #define curthread (__curthread()) 219 220 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 221 222 #error "this file needs to be ported to your compiler" 223 224 #endif /* lint, etc. */ 225 226 #endif /* _KERNEL */ 227 228 #endif /* !_MACHINE_PCPU_H_ */ 229