1 /*- 2 * Copyright (c) 2003-2005, Joseph Koshy 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/pmckern.h> 30 #include <sys/smp.h> 31 32 struct sx pmc_sx; 33 34 /* Hook variable. */ 35 int (*pmc_hook)(struct thread *td, int function, void *arg) = NULL; 36 37 /* Interrupt handler */ 38 int (*pmc_intr)(int cpu, uintptr_t pc, int usermode) = NULL; 39 40 volatile cpumask_t pmc_cpumask; 41 42 /* 43 * A global count of SS mode PMCs. When non-zero, this means that 44 * we have processes that are sampling the system as a whole. 45 */ 46 47 volatile int pmc_ss_count; 48 49 /* 50 * Since PMC(4) may not be loaded in the current kernel, the 51 * convention followed is that a non-NULL value of 'pmc_hook' implies 52 * the presence of this kernel module. 53 * 54 * This requires us to protect 'pmc_hook' with a 55 * shared (sx) lock -- thus making the process of calling into PMC(4) 56 * somewhat more expensive than a simple 'if' check and indirect call. 57 */ 58 59 60 SX_SYSINIT(pmc, &pmc_sx, "pmc shared lock"); 61 62 /* 63 * pmc_cpu_is_disabled 64 * 65 * return TRUE if the cpu specified has been disabled. 66 */ 67 68 int 69 pmc_cpu_is_disabled(int cpu) 70 { 71 #ifdef SMP 72 return ((hlt_cpus_mask & (1 << cpu)) != 0); 73 #else 74 return 0; 75 #endif 76 } 77 78 int 79 pmc_cpu_is_logical(int cpu) 80 { 81 #ifdef SMP 82 return ((logical_cpus_mask & (1 << cpu)) != 0); 83 #else 84 return 0; 85 #endif 86 } 87