1 /*- 2 * Copyright (c) 2003 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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #ifdef HWPMC_HOOKS 31 32 #include <sys/pmckern.h> 33 #include <sys/smp.h> 34 35 struct sx pmc_sx; 36 37 /* Hook variable. */ 38 int (*pmc_hook)(struct thread *td, int function, void *arg) = NULL; 39 40 /* Interrupt handler */ 41 int (*pmc_intr)(int cpu, uintptr_t pc) = NULL; 42 43 /* 44 * Since PMC(4) may not be loaded in the current kernel, the 45 * convention followed is that a non-NULL value of 'pmc_hook' implies 46 * the presence of this kernel module. 47 * 48 * This requires us to protect 'pmc_hook' with a 49 * shared (sx) lock -- thus making the process of calling into PMC(4) 50 * somewhat more expensive than a simple 'if' check and indirect call. 51 */ 52 53 54 SX_SYSINIT(pmc, &pmc_sx, "pmc shared lock"); 55 56 /* 57 * pmc_cpu_is_disabled 58 * 59 * return TRUE if the cpu specified has been disabled. 60 */ 61 62 int 63 pmc_cpu_is_disabled(int cpu) 64 { 65 #ifdef SMP 66 return ((hlt_cpus_mask & (1 << cpu)) != 0); 67 #else 68 return 0; 69 #endif 70 } 71 72 int 73 pmc_cpu_is_logical(int cpu) 74 { 75 #ifdef SMP 76 return ((logical_cpus_mask & (1 << cpu)) != 0); 77 #else 78 return 0; 79 #endif 80 } 81 82 #endif /* HWPMC_HOOKS */ 83