cpuinfo.c revision 283336
1/*- 2 * Copyright 2014 Svatopluk Kraus <onwahe@gmail.com> 3 * Copyright 2014 Michal Meloun <meloun@miracle.cz> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: stable/10/sys/arm/arm/cpuinfo.c 283336 2015-05-23 23:05:31Z ian $"); 30 31#include <sys/param.h> 32#include <sys/systm.h> 33 34#include <machine/cpuinfo.h> 35#include <machine/cpu-v6.h> 36 37struct cpuinfo cpuinfo = 38{ 39 /* Use safe defaults for start */ 40 .dcache_line_size = 32, 41 .dcache_line_mask = 31, 42 .icache_line_size = 32, 43 .icache_line_mask = 31, 44}; 45 46/* Read and parse CPU id scheme */ 47void 48cpuinfo_init(void) 49{ 50 51 cpuinfo.midr = cp15_midr_get(); 52 /* Test old version id schemes first */ 53 if ((cpuinfo.midr & CPU_ID_IMPLEMENTOR_MASK) == CPU_ID_ARM_LTD) { 54 if (CPU_ID_ISOLD(cpuinfo.midr)) { 55 /* obsolete ARMv2 or ARMv3 CPU */ 56 cpuinfo.midr = 0; 57 return; 58 } 59 if (CPU_ID_IS7(cpuinfo.midr)) { 60 if ((cpuinfo.midr & (1 << 23)) == 0) { 61 /* obsolete ARMv3 CPU */ 62 cpuinfo.midr = 0; 63 return; 64 } 65 /* ARMv4T CPU */ 66 cpuinfo.architecture = 1; 67 cpuinfo.revision = (cpuinfo.midr >> 16) & 0x7F; 68 } else { 69 /* ARM new id scheme */ 70 cpuinfo.architecture = (cpuinfo.midr >> 16) & 0x0F; 71 cpuinfo.revision = (cpuinfo.midr >> 20) & 0x0F; 72 } 73 } else { 74 /* non ARM -> must be new id scheme */ 75 cpuinfo.architecture = (cpuinfo.midr >> 16) & 0x0F; 76 cpuinfo.revision = (cpuinfo.midr >> 20) & 0x0F; 77 } 78 /* Parse rest of MIDR */ 79 cpuinfo.implementer = (cpuinfo.midr >> 24) & 0xFF; 80 cpuinfo.part_number = (cpuinfo.midr >> 4) & 0xFFF; 81 cpuinfo.patch = cpuinfo.midr & 0x0F; 82 83 /* CP15 c0,c0 regs 0-7 exist on all CPUs (although aliased with MIDR) */ 84 cpuinfo.ctr = cp15_ctr_get(); 85 cpuinfo.tcmtr = cp15_tcmtr_get(); 86 cpuinfo.tlbtr = cp15_tlbtr_get(); 87 cpuinfo.mpidr = cp15_mpidr_get(); 88 cpuinfo.revidr = cp15_revidr_get(); 89 90 /* if CPU is not v7 cpu id scheme */ 91 if (cpuinfo.architecture != 0xF) 92 return; 93 94 cpuinfo.id_pfr0 = cp15_id_pfr0_get(); 95 cpuinfo.id_pfr1 = cp15_id_pfr1_get(); 96 cpuinfo.id_dfr0 = cp15_id_dfr0_get(); 97 cpuinfo.id_afr0 = cp15_id_afr0_get(); 98 cpuinfo.id_mmfr0 = cp15_id_mmfr0_get(); 99 cpuinfo.id_mmfr1 = cp15_id_mmfr1_get(); 100 cpuinfo.id_mmfr2 = cp15_id_mmfr2_get(); 101 cpuinfo.id_mmfr3 = cp15_id_mmfr3_get(); 102 cpuinfo.id_isar0 = cp15_id_isar0_get(); 103 cpuinfo.id_isar1 = cp15_id_isar1_get(); 104 cpuinfo.id_isar2 = cp15_id_isar2_get(); 105 cpuinfo.id_isar3 = cp15_id_isar3_get(); 106 cpuinfo.id_isar4 = cp15_id_isar4_get(); 107 cpuinfo.id_isar5 = cp15_id_isar5_get(); 108 109/* Not yet - CBAR only exist on ARM SMP Cortex A CPUs 110 cpuinfo.cbar = cp15_cbar_get(); 111*/ 112 113 /* Test if revidr is implemented */ 114 if (cpuinfo.revidr == cpuinfo.midr) 115 cpuinfo.revidr = 0; 116 117 /* parsed bits of above registers */ 118 /* id_mmfr0 */ 119 cpuinfo.outermost_shareability = (cpuinfo.id_mmfr0 >> 8) & 0xF; 120 cpuinfo.shareability_levels = (cpuinfo.id_mmfr0 >> 12) & 0xF; 121 cpuinfo.auxiliary_registers = (cpuinfo.id_mmfr0 >> 20) & 0xF; 122 cpuinfo.innermost_shareability = (cpuinfo.id_mmfr0 >> 28) & 0xF; 123 /* id_mmfr2 */ 124 cpuinfo.mem_barrier = (cpuinfo.id_mmfr2 >> 20) & 0xF; 125 /* id_mmfr3 */ 126 cpuinfo.coherent_walk = (cpuinfo.id_mmfr3 >> 20) & 0xF; 127 cpuinfo.maintenance_broadcast =(cpuinfo.id_mmfr3 >> 12) & 0xF; 128 /* id_pfr1 */ 129 cpuinfo.generic_timer_ext = (cpuinfo.id_pfr1 >> 16) & 0xF; 130 cpuinfo.virtualization_ext = (cpuinfo.id_pfr1 >> 12) & 0xF; 131 cpuinfo.security_ext = (cpuinfo.id_pfr1 >> 4) & 0xF; 132 133 /* L1 Cache sizes */ 134 cpuinfo.dcache_line_size = 1 << (CPU_CT_DMINLINE(cpuinfo.ctr ) + 2); 135 cpuinfo.dcache_line_mask = cpuinfo.dcache_line_size - 1; 136 cpuinfo.icache_line_size= 1 << (CPU_CT_IMINLINE(cpuinfo.ctr ) + 2); 137 cpuinfo.icache_line_mask = cpuinfo.icache_line_size - 1; 138} 139