1 /*- 2 * Copyright (c) 2011 The DragonFly Project. All rights reserved. 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 * 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 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 3. Neither the name of The DragonFly Project nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific, prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kernel.h> 35 #include <sys/systm.h> 36 #include <sys/sysctl.h> 37 38 #include <machine/cpufunc.h> 39 #include <machine/cputypes.h> 40 #include <machine/md_var.h> 41 #include <machine/specialreg.h> 42 43 #include "acpi.h" 44 #include "acpivar.h" 45 #include "acpi_cpu.h" 46 47 uint32_t 48 acpi_cpu_md_features(void) 49 { 50 uint32_t features = 0; 51 52 if (cpu_vendor_id == CPU_VENDOR_INTEL) { 53 if (cpu_feature2 & CPUID2_EST) { 54 features |= ACPI_PDC_PX_MSR | 55 ACPI_PDC_MP_PX_SWCOORD | 56 ACPI_PDC_PX_HWCOORD; 57 } 58 if ((cpu_feature2 & CPUID2_MON) && 59 (cpu_mwait_feature & 60 (CPUID_MWAIT_EXT | CPUID_MWAIT_INTBRK)) == 61 (CPUID_MWAIT_EXT | CPUID_MWAIT_INTBRK)) { 62 features |= ACPI_PDC_MP_C1_NATIVE | 63 ACPI_PDC_MP_C2C3_NATIVE; 64 } 65 } 66 return features; 67 } 68