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 #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) = NULL; 39 40 /* 41 * Since PMC(4) may not be loaded in the current kernel, the 42 * convention followed is that a non-NULL value of 'pmc_hook' implies 43 * the presence of this kernel module. 44 * 45 * This requires us to protect 'pmc_hook' with a 46 * shared (sx) lock -- thus making the process of calling into PMC(4) 47 * somewhat more expensive than a simple 'if' check and indirect call. 48 */ 49 50 51 SX_SYSINIT(pmc, &pmc_sx, "pmc shared lock"); 52 53 /* 54 * pmc_cpu_is_disabled 55 * 56 * return TRUE if the cpu specified has been disabled. 57 */ 58 59 int 60 pmc_cpu_is_disabled(int cpu) 61 { 62 #ifdef SMP 63 return ((hlt_cpus_mask & (1 << cpu)) != 0); 64 #else 65 return 0; 66 #endif 67 } 68 69 int 70 pmc_cpu_is_logical(int cpu) 71 { 72 #ifdef SMP 73 return ((logical_cpus_mask & (1 << cpu)) != 0); 74 #else 75 return 0; 76 #endif 77 } 78