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_unused; \ 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 void *pc_smp_tlb_pmap; \ 98 uint64_t pc_smp_tlb_addr1; \ 99 uint64_t pc_smp_tlb_addr2; \ 100 uint32_t pc_smp_tlb_gen; \ 101 u_int pc_smp_tlb_op; \ 102 uint64_t pc_ucr3_load_mask; \ 103 char __pad[2916] /* pad to UMA_PCPU_ALLOC_SIZE */ 104 105 #define PC_DBREG_CMD_NONE 0 106 #define PC_DBREG_CMD_LOAD 1 107 108 #ifdef _KERNEL 109 110 #define MONITOR_STOPSTATE_RUNNING 0 111 #define MONITOR_STOPSTATE_STOPPED 1 112 113 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 114 115 /* 116 * Evaluates to the byte offset of the per-cpu variable name. 117 */ 118 #define __pcpu_offset(name) \ 119 __offsetof(struct pcpu, name) 120 121 /* 122 * Evaluates to the type of the per-cpu variable name. 123 */ 124 #define __pcpu_type(name) \ 125 __typeof(((struct pcpu *)0)->name) 126 127 /* 128 * Evaluates to the address of the per-cpu variable name. 129 */ 130 #define __PCPU_PTR(name) __extension__ ({ \ 131 __pcpu_type(name) *__p; \ 132 \ 133 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 134 : "=r" (__p) \ 135 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 136 "i" (__pcpu_offset(name))); \ 137 \ 138 __p; \ 139 }) 140 141 /* 142 * Evaluates to the value of the per-cpu variable name. 143 */ 144 #define __PCPU_GET(name) __extension__ ({ \ 145 __pcpu_type(name) __res; \ 146 struct __s { \ 147 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 148 } __s; \ 149 \ 150 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 151 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 152 __asm __volatile("mov %%gs:%1,%0" \ 153 : "=r" (__s) \ 154 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 155 *(struct __s *)(void *)&__res = __s; \ 156 } else { \ 157 __res = *__PCPU_PTR(name); \ 158 } \ 159 __res; \ 160 }) 161 162 /* 163 * Adds the value to the per-cpu counter name. The implementation 164 * must be atomic with respect to interrupts. 165 */ 166 #define __PCPU_ADD(name, val) do { \ 167 __pcpu_type(name) __val; \ 168 struct __s { \ 169 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 170 } __s; \ 171 \ 172 __val = (val); \ 173 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 174 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 175 __s = *(struct __s *)(void *)&__val; \ 176 __asm __volatile("add %1,%%gs:%0" \ 177 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 178 : "r" (__s)); \ 179 } else \ 180 *__PCPU_PTR(name) += __val; \ 181 } while (0) 182 183 /* 184 * Increments the value of the per-cpu counter name. The implementation 185 * must be atomic with respect to interrupts. 186 */ 187 #define __PCPU_INC(name) do { \ 188 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 189 sizeof(__pcpu_type(name)) == 2 || \ 190 sizeof(__pcpu_type(name)) == 4 || \ 191 sizeof(__pcpu_type(name)) == 8); \ 192 if (sizeof(__pcpu_type(name)) == 1) { \ 193 __asm __volatile("incb %%gs:%0" \ 194 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 195 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 196 } else if (sizeof(__pcpu_type(name)) == 2) { \ 197 __asm __volatile("incw %%gs:%0" \ 198 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 199 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 200 } else if (sizeof(__pcpu_type(name)) == 4) { \ 201 __asm __volatile("incl %%gs:%0" \ 202 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 203 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 204 } else if (sizeof(__pcpu_type(name)) == 8) { \ 205 __asm __volatile("incq %%gs:%0" \ 206 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 207 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 208 } \ 209 } while (0) 210 211 /* 212 * Sets the value of the per-cpu variable name to value val. 213 */ 214 #define __PCPU_SET(name, val) { \ 215 __pcpu_type(name) __val; \ 216 struct __s { \ 217 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 218 } __s; \ 219 \ 220 __val = (val); \ 221 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 222 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 223 __s = *(struct __s *)(void *)&__val; \ 224 __asm __volatile("mov %1,%%gs:%0" \ 225 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 226 : "r" (__s)); \ 227 } else { \ 228 *__PCPU_PTR(name) = __val; \ 229 } \ 230 } 231 232 #define get_pcpu() __extension__ ({ \ 233 struct pcpu *__pc; \ 234 \ 235 __asm __volatile("movq %%gs:%1,%0" \ 236 : "=r" (__pc) \ 237 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 238 __pc; \ 239 }) 240 241 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 242 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 243 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 244 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 245 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 246 247 #define IS_BSP() (PCPU_GET(cpuid) == 0) 248 249 #define zpcpu_offset_cpu(cpu) ((uintptr_t)&__pcpu[0] + UMA_PCPU_ALLOC_SIZE * cpu) 250 #define zpcpu_base_to_offset(base) (void *)((uintptr_t)(base) - (uintptr_t)&__pcpu[0]) 251 #define zpcpu_offset_to_base(base) (void *)((uintptr_t)(base) + (uintptr_t)&__pcpu[0]) 252 253 #define zpcpu_sub_protected(base, n) do { \ 254 ZPCPU_ASSERT_PROTECTED(); \ 255 zpcpu_sub(base, n); \ 256 } while (0) 257 258 #define zpcpu_set_protected(base, n) do { \ 259 __typeof(*base) __n = (n); \ 260 ZPCPU_ASSERT_PROTECTED(); \ 261 switch (sizeof(*base)) { \ 262 case 4: \ 263 __asm __volatile("movl\t%1,%%gs:(%0)" \ 264 : : "r" (base), "ri" (__n) : "memory", "cc"); \ 265 break; \ 266 case 8: \ 267 __asm __volatile("movq\t%1,%%gs:(%0)" \ 268 : : "r" (base), "ri" (__n) : "memory", "cc"); \ 269 break; \ 270 default: \ 271 *zpcpu_get(base) = __n; \ 272 } \ 273 } while (0); 274 275 #define zpcpu_add(base, n) do { \ 276 __typeof(*base) __n = (n); \ 277 CTASSERT(sizeof(*base) == 4 || sizeof(*base) == 8); \ 278 switch (sizeof(*base)) { \ 279 case 4: \ 280 __asm __volatile("addl\t%1,%%gs:(%0)" \ 281 : : "r" (base), "ri" (__n) : "memory", "cc"); \ 282 break; \ 283 case 8: \ 284 __asm __volatile("addq\t%1,%%gs:(%0)" \ 285 : : "r" (base), "ri" (__n) : "memory", "cc"); \ 286 break; \ 287 } \ 288 } while (0) 289 290 #define zpcpu_add_protected(base, n) do { \ 291 ZPCPU_ASSERT_PROTECTED(); \ 292 zpcpu_add(base, n); \ 293 } while (0) 294 295 #define zpcpu_sub(base, n) do { \ 296 __typeof(*base) __n = (n); \ 297 CTASSERT(sizeof(*base) == 4 || sizeof(*base) == 8); \ 298 switch (sizeof(*base)) { \ 299 case 4: \ 300 __asm __volatile("subl\t%1,%%gs:(%0)" \ 301 : : "r" (base), "ri" (__n) : "memory", "cc"); \ 302 break; \ 303 case 8: \ 304 __asm __volatile("subq\t%1,%%gs:(%0)" \ 305 : : "r" (base), "ri" (__n) : "memory", "cc"); \ 306 break; \ 307 } \ 308 } while (0); 309 310 #else /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */ 311 312 #error "this file needs to be ported to your compiler" 313 314 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */ 315 316 #endif /* _KERNEL */ 317 318 #endif /* !_MACHINE_PCPU_H_ */ 319