1 /*- 2 * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org> 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_COUNTER_H__ 30 #define __MACHINE_COUNTER_H__ 31 32 #include <sys/pcpu.h> 33 #ifdef INVARIANTS 34 #include <sys/proc.h> 35 #endif 36 #include <machine/md_var.h> 37 #include <machine/specialreg.h> 38 39 #define counter_enter() do { \ 40 if ((cpu_feature & CPUID_CX8) == 0) \ 41 critical_enter(); \ 42 } while (0) 43 44 #define counter_exit() do { \ 45 if ((cpu_feature & CPUID_CX8) == 0) \ 46 critical_exit(); \ 47 } while (0) 48 49 extern struct pcpu __pcpu[MAXCPU]; 50 51 static inline void 52 counter_64_inc_8b(uint64_t *p, int64_t inc) 53 { 54 55 __asm __volatile( 56 "movl %%fs:(%%esi),%%eax\n\t" 57 "movl %%fs:4(%%esi),%%edx\n" 58 "1:\n\t" 59 "movl %%eax,%%ebx\n\t" 60 "movl %%edx,%%ecx\n\t" 61 "addl (%%edi),%%ebx\n\t" 62 "adcl 4(%%edi),%%ecx\n\t" 63 "cmpxchg8b %%fs:(%%esi)\n\t" 64 "jnz 1b" 65 : 66 : "S" ((char *)p - (char *)&__pcpu[0]), "D" (&inc) 67 : "memory", "cc", "eax", "edx", "ebx", "ecx"); 68 } 69 70 #define counter_u64_add_protected(c, inc) do { \ 71 if ((cpu_feature & CPUID_CX8) == 0) { \ 72 CRITICAL_ASSERT(curthread); \ 73 *(uint64_t *)zpcpu_get(c) += (inc); \ 74 } else \ 75 counter_64_inc_8b((c), (inc)); \ 76 } while (0) 77 78 static inline void 79 counter_u64_add(counter_u64_t c, int64_t inc) 80 { 81 82 if ((cpu_feature & CPUID_CX8) == 0) { 83 critical_enter(); 84 *(uint64_t *)zpcpu_get(c) += inc; 85 critical_exit(); 86 } else { 87 counter_64_inc_8b(c, inc); 88 } 89 } 90 91 #endif /* ! __MACHINE_COUNTER_H__ */ 92