1 /*- 2 * Copyright (c) 2013 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Matt Thomas of 3am Software Foundry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include "opt_multiprocessor.h" 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(1, "$NetBSD: arm32_tlb.c,v 1.11 2017/08/24 14:19:36 jmcneill Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/types.h> 37 38 #include <uvm/uvm.h> 39 40 #include <arm/locore.h> 41 42 bool arm_has_tlbiasid_p; // CPU supports TLBIASID system coprocessor op 43 bool arm_has_mpext_p; // CPU supports MP extensions 44 45 tlb_asid_t 46 tlb_get_asid(void) 47 { 48 return armreg_contextidr_read() & 0xff; 49 } 50 51 void 52 tlb_set_asid(tlb_asid_t asid) 53 { 54 arm_dsb(); 55 if (asid == KERNEL_PID) { 56 armreg_ttbcr_write(armreg_ttbcr_read() | TTBCR_S_PD0); 57 arm_isb(); 58 } 59 armreg_contextidr_write(asid); 60 arm_isb(); 61 } 62 63 void 64 tlb_invalidate_all(void) 65 { 66 const bool vivt_icache_p = arm_pcache.icache_type == CACHE_TYPE_VIVT; 67 arm_dsb(); 68 if (arm_has_mpext_p) { 69 armreg_tlbiallis_write(0); 70 } else { 71 armreg_tlbiall_write(0); 72 } 73 arm_isb(); 74 if (__predict_false(vivt_icache_p)) { 75 if (arm_has_tlbiasid_p) { 76 armreg_icialluis_write(0); 77 } else { 78 armreg_iciallu_write(0); 79 } 80 } 81 arm_dsb(); 82 arm_isb(); 83 } 84 85 void 86 tlb_invalidate_globals(void) 87 { 88 tlb_invalidate_all(); 89 } 90 91 void 92 tlb_invalidate_asids(tlb_asid_t lo, tlb_asid_t hi) 93 { 94 const bool vivt_icache_p = arm_pcache.icache_type == CACHE_TYPE_VIVT; 95 arm_dsb(); 96 if (arm_has_tlbiasid_p) { 97 for (; lo <= hi; lo++) { 98 if (arm_has_mpext_p) { 99 armreg_tlbiasidis_write(lo); 100 } else { 101 armreg_tlbiasid_write(lo); 102 } 103 } 104 arm_dsb(); 105 arm_isb(); 106 if (__predict_false(vivt_icache_p)) { 107 if (arm_has_mpext_p) { 108 armreg_icialluis_write(0); 109 } else { 110 armreg_iciallu_write(0); 111 } 112 } 113 } else { 114 armreg_tlbiall_write(0); 115 arm_isb(); 116 if (__predict_false(vivt_icache_p)) { 117 armreg_iciallu_write(0); 118 } 119 } 120 arm_isb(); 121 } 122 123 void 124 tlb_invalidate_addr(vaddr_t va, tlb_asid_t asid) 125 { 126 arm_dsb(); 127 va = trunc_page(va) | asid; 128 for (vaddr_t eva = va + PAGE_SIZE; va < eva; va += L2_S_SIZE) { 129 if (arm_has_mpext_p) { 130 armreg_tlbimvais_write(va); 131 } else { 132 armreg_tlbimva_write(va); 133 } 134 } 135 arm_isb(); 136 } 137 138 bool 139 tlb_update_addr(vaddr_t va, tlb_asid_t asid, pt_entry_t pte, bool insert_p) 140 { 141 tlb_invalidate_addr(va, asid); 142 return true; 143 } 144 145 #if !defined(MULTIPROCESSOR) && defined(CPU_CORTEXA5) 146 static u_int 147 tlb_cortex_a5_record_asids(u_long *mapp, tlb_asid_t asid_max) 148 { 149 u_int nasids = 0; 150 for (size_t va_index = 0; va_index < 63; va_index++) { 151 for (size_t way = 0; way < 2; way++) { 152 armreg_tlbdataop_write( 153 __SHIFTIN(way, ARM_TLBDATAOP_WAY) 154 | __SHIFTIN(va_index, ARM_A5_TLBDATAOP_INDEX)); 155 arm_isb(); 156 const uint64_t d = ((uint64_t) armreg_tlbdata1_read()) 157 | armreg_tlbdata0_read(); 158 if (!(d & ARM_TLBDATA_VALID) 159 || !(d & ARM_A5_TLBDATA_nG)) 160 continue; 161 162 const tlb_asid_t asid = __SHIFTOUT(d, 163 ARM_A5_TLBDATA_ASID); 164 const u_long mask = 1L << (asid & 31); 165 const size_t idx = asid >> 5; 166 if (mapp[idx] & mask) 167 continue; 168 169 mapp[idx] |= mask; 170 nasids++; 171 } 172 } 173 return nasids; 174 } 175 #endif 176 177 #if !defined(MULTIPROCESSOR) && defined(CPU_CORTEXA7) 178 static u_int 179 tlb_cortex_a7_record_asids(u_long *mapp, tlb_asid_t asid_max) 180 { 181 u_int nasids = 0; 182 for (size_t va_index = 0; va_index < 128; va_index++) { 183 for (size_t way = 0; way < 2; way++) { 184 armreg_tlbdataop_write( 185 __SHIFTIN(way, ARM_TLBDATAOP_WAY) 186 | __SHIFTIN(va_index, ARM_A7_TLBDATAOP_INDEX)); 187 arm_isb(); 188 const uint32_t d0 = armreg_tlbdata0_read(); 189 const uint32_t d1 = armreg_tlbdata1_read(); 190 if (!(d0 & ARM_TLBDATA_VALID) 191 || !(d1 & ARM_A7_TLBDATA1_nG)) 192 continue; 193 194 const uint64_t d01 = ((uint64_t) d1)|d0; 195 const tlb_asid_t asid = __SHIFTOUT(d01, 196 ARM_A7_TLBDATA01_ASID); 197 const u_long mask = 1L << (asid & 31); 198 const size_t idx = asid >> 5; 199 if (mapp[idx] & mask) 200 continue; 201 202 mapp[idx] |= mask; 203 nasids++; 204 } 205 } 206 return nasids; 207 } 208 #endif 209 210 u_int 211 tlb_record_asids(u_long *mapp, tlb_asid_t asid_max) 212 { 213 #ifndef MULTIPROCESSOR 214 #ifdef CPU_CORTEXA5 215 if (CPU_ID_CORTEX_A5_P(curcpu()->ci_arm_cpuid)) 216 return tlb_cortex_a5_record_asids(mapp, asid_max); 217 #endif 218 #ifdef CPU_CORTEXA7 219 if (CPU_ID_CORTEX_A7_P(curcpu()->ci_arm_cpuid)) 220 return tlb_cortex_a7_record_asids(mapp, asid_max); 221 #endif 222 #endif /* MULTIPROCESSOR */ 223 #ifdef DIAGNOSTIC 224 mapp[0] = 0xfffffffe; 225 mapp[1] = 0xffffffff; 226 mapp[2] = 0xffffffff; 227 mapp[3] = 0xffffffff; 228 mapp[4] = 0xffffffff; 229 mapp[5] = 0xffffffff; 230 mapp[6] = 0xffffffff; 231 mapp[7] = 0xffffffff; 232 #endif 233 return 255; 234 } 235 236 void 237 tlb_walk(void *ctx, bool (*func)(void *, vaddr_t, tlb_asid_t, pt_entry_t)) 238 { 239 /* no way to view the TLB */ 240 } 241