Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | comment "Processor Type" |
| 2 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | # Select CPU types depending on the architecture selected. This selects |
| 4 | # which CPUs we support in the kernel image, and the compiler instruction |
| 5 | # optimiser behaviour. |
| 6 | |
Hyok S. Choi | 07e0da7 | 2006-09-26 17:37:36 +0900 | [diff] [blame] | 7 | # ARM7TDMI |
| 8 | config CPU_ARM7TDMI |
Arnd Bergmann | c32b765 | 2015-05-26 15:40:16 +0100 | [diff] [blame] | 9 | bool |
Russell King | 6b237a3 | 2006-09-27 17:44:39 +0100 | [diff] [blame] | 10 | depends on !MMU |
Hyok S. Choi | 07e0da7 | 2006-09-26 17:37:36 +0900 | [diff] [blame] | 11 | select CPU_32v4T |
| 12 | select CPU_ABRT_LV4T |
| 13 | select CPU_CACHE_V4 |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 14 | select CPU_PABRT_LEGACY |
Hyok S. Choi | 07e0da7 | 2006-09-26 17:37:36 +0900 | [diff] [blame] | 15 | help |
| 16 | A 32-bit RISC microprocessor based on the ARM7 processor core |
| 17 | which has no memory control unit and cache. |
| 18 | |
| 19 | Say Y if you want support for the ARM7TDMI processor. |
| 20 | Otherwise, say N. |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | # ARM720T |
| 23 | config CPU_ARM720T |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 24 | bool |
Lennert Buytenhek | 260e98e | 2006-08-28 12:51:20 +0100 | [diff] [blame] | 25 | select CPU_32v4T |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | select CPU_ABRT_LV4T |
| 27 | select CPU_CACHE_V4 |
| 28 | select CPU_CACHE_VIVT |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 29 | select CPU_COPY_V4WT if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 30 | select CPU_CP15_MMU |
| 31 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 32 | select CPU_TLB_V4WT if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | help |
| 34 | A 32-bit RISC processor with 8kByte Cache, Write Buffer and |
| 35 | MMU built around an ARM7TDMI core. |
| 36 | |
| 37 | Say Y if you want support for the ARM720T processor. |
| 38 | Otherwise, say N. |
| 39 | |
Hyok S. Choi | b731c31 | 2006-09-26 17:37:50 +0900 | [diff] [blame] | 40 | # ARM740T |
| 41 | config CPU_ARM740T |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 42 | bool |
Russell King | 6b237a3 | 2006-09-27 17:44:39 +0100 | [diff] [blame] | 43 | depends on !MMU |
Hyok S. Choi | b731c31 | 2006-09-26 17:37:50 +0900 | [diff] [blame] | 44 | select CPU_32v4T |
| 45 | select CPU_ABRT_LV4T |
Will Deacon | 82d9b0d | 2013-01-15 12:07:40 +0000 | [diff] [blame] | 46 | select CPU_CACHE_V4 |
Hyok S. Choi | b731c31 | 2006-09-26 17:37:50 +0900 | [diff] [blame] | 47 | select CPU_CP15_MPU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 48 | select CPU_PABRT_LEGACY |
Hyok S. Choi | b731c31 | 2006-09-26 17:37:50 +0900 | [diff] [blame] | 49 | help |
| 50 | A 32-bit RISC processor with 8KB cache or 4KB variants, |
| 51 | write buffer and MPU(Protection Unit) built around |
| 52 | an ARM7TDMI core. |
| 53 | |
| 54 | Say Y if you want support for the ARM740T processor. |
| 55 | Otherwise, say N. |
| 56 | |
Hyok S. Choi | 43f5f01 | 2006-09-26 17:38:05 +0900 | [diff] [blame] | 57 | # ARM9TDMI |
| 58 | config CPU_ARM9TDMI |
Arnd Bergmann | c32b765 | 2015-05-26 15:40:16 +0100 | [diff] [blame] | 59 | bool |
Russell King | 6b237a3 | 2006-09-27 17:44:39 +0100 | [diff] [blame] | 60 | depends on !MMU |
Hyok S. Choi | 43f5f01 | 2006-09-26 17:38:05 +0900 | [diff] [blame] | 61 | select CPU_32v4T |
Hyok S. Choi | 0f45d7f | 2006-09-28 21:46:16 +0900 | [diff] [blame] | 62 | select CPU_ABRT_NOMMU |
Hyok S. Choi | 43f5f01 | 2006-09-26 17:38:05 +0900 | [diff] [blame] | 63 | select CPU_CACHE_V4 |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 64 | select CPU_PABRT_LEGACY |
Hyok S. Choi | 43f5f01 | 2006-09-26 17:38:05 +0900 | [diff] [blame] | 65 | help |
| 66 | A 32-bit RISC microprocessor based on the ARM9 processor core |
| 67 | which has no memory control unit and cache. |
| 68 | |
| 69 | Say Y if you want support for the ARM9TDMI processor. |
| 70 | Otherwise, say N. |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | # ARM920T |
| 73 | config CPU_ARM920T |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 74 | bool |
Lennert Buytenhek | 260e98e | 2006-08-28 12:51:20 +0100 | [diff] [blame] | 75 | select CPU_32v4T |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | select CPU_ABRT_EV4T |
| 77 | select CPU_CACHE_V4WT |
| 78 | select CPU_CACHE_VIVT |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 79 | select CPU_COPY_V4WB if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 80 | select CPU_CP15_MMU |
| 81 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 82 | select CPU_TLB_V4WBI if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | help |
| 84 | The ARM920T is licensed to be produced by numerous vendors, |
Hartley Sweeten | c768e676 | 2009-10-21 02:27:01 +0100 | [diff] [blame] | 85 | and is used in the Cirrus EP93xx and the Samsung S3C2410. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
| 87 | Say Y if you want support for the ARM920T processor. |
| 88 | Otherwise, say N. |
| 89 | |
| 90 | # ARM922T |
| 91 | config CPU_ARM922T |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 92 | bool |
Lennert Buytenhek | 260e98e | 2006-08-28 12:51:20 +0100 | [diff] [blame] | 93 | select CPU_32v4T |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | select CPU_ABRT_EV4T |
| 95 | select CPU_CACHE_V4WT |
| 96 | select CPU_CACHE_VIVT |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 97 | select CPU_COPY_V4WB if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 98 | select CPU_CP15_MMU |
| 99 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 100 | select CPU_TLB_V4WBI if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | help |
| 102 | The ARM922T is a version of the ARM920T, but with smaller |
| 103 | instruction and data caches. It is used in Altera's |
Andrew Victor | c53c9cf | 2007-05-11 21:01:28 +0100 | [diff] [blame] | 104 | Excalibur XA device family and Micrel's KS8695 Centaur. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
| 106 | Say Y if you want support for the ARM922T processor. |
| 107 | Otherwise, say N. |
| 108 | |
| 109 | # ARM925T |
| 110 | config CPU_ARM925T |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 111 | bool |
Lennert Buytenhek | 260e98e | 2006-08-28 12:51:20 +0100 | [diff] [blame] | 112 | select CPU_32v4T |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | select CPU_ABRT_EV4T |
| 114 | select CPU_CACHE_V4WT |
| 115 | select CPU_CACHE_VIVT |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 116 | select CPU_COPY_V4WB if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 117 | select CPU_CP15_MMU |
| 118 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 119 | select CPU_TLB_V4WBI if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | help |
| 121 | The ARM925T is a mix between the ARM920T and ARM926T, but with |
| 122 | different instruction and data caches. It is used in TI's OMAP |
| 123 | device family. |
| 124 | |
| 125 | Say Y if you want support for the ARM925T processor. |
| 126 | Otherwise, say N. |
| 127 | |
| 128 | # ARM926T |
| 129 | config CPU_ARM926T |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 130 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | select CPU_32v5 |
| 132 | select CPU_ABRT_EV5TJ |
| 133 | select CPU_CACHE_VIVT |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 134 | select CPU_COPY_V4WB if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 135 | select CPU_CP15_MMU |
| 136 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 137 | select CPU_TLB_V4WBI if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | help |
| 139 | This is a variant of the ARM920. It has slightly different |
| 140 | instruction sequences for cache and TLB operations. Curiously, |
| 141 | there is no documentation on it at the ARM corporate website. |
| 142 | |
| 143 | Say Y if you want support for the ARM926T processor. |
| 144 | Otherwise, say N. |
| 145 | |
Paulius Zaleckas | 28853ac | 2009-03-25 13:10:01 +0200 | [diff] [blame] | 146 | # FA526 |
| 147 | config CPU_FA526 |
| 148 | bool |
| 149 | select CPU_32v4 |
| 150 | select CPU_ABRT_EV4 |
Paulius Zaleckas | 28853ac | 2009-03-25 13:10:01 +0200 | [diff] [blame] | 151 | select CPU_CACHE_FA |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 152 | select CPU_CACHE_VIVT |
Paulius Zaleckas | 28853ac | 2009-03-25 13:10:01 +0200 | [diff] [blame] | 153 | select CPU_COPY_FA if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 154 | select CPU_CP15_MMU |
| 155 | select CPU_PABRT_LEGACY |
Paulius Zaleckas | 28853ac | 2009-03-25 13:10:01 +0200 | [diff] [blame] | 156 | select CPU_TLB_FA if MMU |
| 157 | help |
| 158 | The FA526 is a version of the ARMv4 compatible processor with |
| 159 | Branch Target Buffer, Unified TLB and cache line size 16. |
| 160 | |
| 161 | Say Y if you want support for the FA526 processor. |
| 162 | Otherwise, say N. |
| 163 | |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 164 | # ARM940T |
| 165 | config CPU_ARM940T |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 166 | bool |
Russell King | 6b237a3 | 2006-09-27 17:44:39 +0100 | [diff] [blame] | 167 | depends on !MMU |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 168 | select CPU_32v4T |
Hyok S. Choi | 0f45d7f | 2006-09-28 21:46:16 +0900 | [diff] [blame] | 169 | select CPU_ABRT_NOMMU |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 170 | select CPU_CACHE_VIVT |
| 171 | select CPU_CP15_MPU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 172 | select CPU_PABRT_LEGACY |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 173 | help |
| 174 | ARM940T is a member of the ARM9TDMI family of general- |
Matt LaPlante | 3cb2fcc | 2006-11-30 05:22:59 +0100 | [diff] [blame] | 175 | purpose microprocessors with MPU and separate 4KB |
Hyok S. Choi | d60674e | 2006-09-26 17:38:18 +0900 | [diff] [blame] | 176 | instruction and 4KB data cases, each with a 4-word line |
| 177 | length. |
| 178 | |
| 179 | Say Y if you want support for the ARM940T processor. |
| 180 | Otherwise, say N. |
| 181 | |
Hyok S. Choi | f37f46e | 2006-09-26 17:38:32 +0900 | [diff] [blame] | 182 | # ARM946E-S |
| 183 | config CPU_ARM946E |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 184 | bool |
Russell King | 6b237a3 | 2006-09-27 17:44:39 +0100 | [diff] [blame] | 185 | depends on !MMU |
Hyok S. Choi | f37f46e | 2006-09-26 17:38:32 +0900 | [diff] [blame] | 186 | select CPU_32v5 |
Hyok S. Choi | 0f45d7f | 2006-09-28 21:46:16 +0900 | [diff] [blame] | 187 | select CPU_ABRT_NOMMU |
Hyok S. Choi | f37f46e | 2006-09-26 17:38:32 +0900 | [diff] [blame] | 188 | select CPU_CACHE_VIVT |
| 189 | select CPU_CP15_MPU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 190 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f37f46e | 2006-09-26 17:38:32 +0900 | [diff] [blame] | 191 | help |
| 192 | ARM946E-S is a member of the ARM9E-S family of high- |
| 193 | performance, 32-bit system-on-chip processor solutions. |
| 194 | The TCM and ARMv5TE 32-bit instruction set is supported. |
| 195 | |
| 196 | Say Y if you want support for the ARM946E-S processor. |
| 197 | Otherwise, say N. |
| 198 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | # ARM1020 - needs validating |
| 200 | config CPU_ARM1020 |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 201 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | select CPU_32v5 |
| 203 | select CPU_ABRT_EV4T |
| 204 | select CPU_CACHE_V4WT |
| 205 | select CPU_CACHE_VIVT |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 206 | select CPU_COPY_V4WB if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 207 | select CPU_CP15_MMU |
| 208 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 209 | select CPU_TLB_V4WBI if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | help |
| 211 | The ARM1020 is the 32K cached version of the ARM10 processor, |
| 212 | with an addition of a floating-point unit. |
| 213 | |
| 214 | Say Y if you want support for the ARM1020 processor. |
| 215 | Otherwise, say N. |
| 216 | |
| 217 | # ARM1020E - needs validating |
| 218 | config CPU_ARM1020E |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 219 | bool |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 220 | depends on n |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | select CPU_32v5 |
| 222 | select CPU_ABRT_EV4T |
| 223 | select CPU_CACHE_V4WT |
| 224 | select CPU_CACHE_VIVT |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 225 | select CPU_COPY_V4WB if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 226 | select CPU_CP15_MMU |
| 227 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 228 | select CPU_TLB_V4WBI if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
| 230 | # ARM1022E |
| 231 | config CPU_ARM1022 |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 232 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | select CPU_32v5 |
| 234 | select CPU_ABRT_EV4T |
| 235 | select CPU_CACHE_VIVT |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 236 | select CPU_COPY_V4WB if MMU # can probably do better |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 237 | select CPU_CP15_MMU |
| 238 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 239 | select CPU_TLB_V4WBI if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | help |
| 241 | The ARM1022E is an implementation of the ARMv5TE architecture |
| 242 | based upon the ARM10 integer core with a 16KiB L1 Harvard cache, |
| 243 | embedded trace macrocell, and a floating-point unit. |
| 244 | |
| 245 | Say Y if you want support for the ARM1022E processor. |
| 246 | Otherwise, say N. |
| 247 | |
| 248 | # ARM1026EJ-S |
| 249 | config CPU_ARM1026 |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 250 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | select CPU_32v5 |
| 252 | select CPU_ABRT_EV5T # But need Jazelle, but EV5TJ ignores bit 10 |
| 253 | select CPU_CACHE_VIVT |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 254 | select CPU_COPY_V4WB if MMU # can probably do better |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 255 | select CPU_CP15_MMU |
| 256 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 257 | select CPU_TLB_V4WBI if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | help |
| 259 | The ARM1026EJ-S is an implementation of the ARMv5TEJ architecture |
| 260 | based upon the ARM10 integer core. |
| 261 | |
| 262 | Say Y if you want support for the ARM1026EJ-S processor. |
| 263 | Otherwise, say N. |
| 264 | |
| 265 | # SA110 |
| 266 | config CPU_SA110 |
Arnd Bergmann | fa04e20 | 2014-02-26 17:39:12 +0100 | [diff] [blame] | 267 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | select CPU_32v3 if ARCH_RPC |
| 269 | select CPU_32v4 if !ARCH_RPC |
| 270 | select CPU_ABRT_EV4 |
| 271 | select CPU_CACHE_V4WB |
| 272 | select CPU_CACHE_VIVT |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 273 | select CPU_COPY_V4WB if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 274 | select CPU_CP15_MMU |
| 275 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 276 | select CPU_TLB_V4WB if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | help |
| 278 | The Intel StrongARM(R) SA-110 is a 32-bit microprocessor and |
| 279 | is available at five speeds ranging from 100 MHz to 233 MHz. |
| 280 | More information is available at |
| 281 | <http://developer.intel.com/design/strong/sa110.htm>. |
| 282 | |
| 283 | Say Y if you want support for the SA-110 processor. |
| 284 | Otherwise, say N. |
| 285 | |
| 286 | # SA1100 |
| 287 | config CPU_SA1100 |
| 288 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | select CPU_32v4 |
| 290 | select CPU_ABRT_EV4 |
| 291 | select CPU_CACHE_V4WB |
| 292 | select CPU_CACHE_VIVT |
Hyok S. Choi | fefdaa0 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 293 | select CPU_CP15_MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 294 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 295 | select CPU_TLB_V4WB if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
| 297 | # XScale |
| 298 | config CPU_XSCALE |
| 299 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | select CPU_32v5 |
| 301 | select CPU_ABRT_EV5T |
| 302 | select CPU_CACHE_VIVT |
Hyok S. Choi | fefdaa0 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 303 | select CPU_CP15_MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 304 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 305 | select CPU_TLB_V4WBI if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 307 | # XScale Core Version 3 |
| 308 | config CPU_XSC3 |
| 309 | bool |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 310 | select CPU_32v5 |
| 311 | select CPU_ABRT_EV5T |
| 312 | select CPU_CACHE_VIVT |
Hyok S. Choi | fefdaa0 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 313 | select CPU_CP15_MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 314 | select CPU_PABRT_LEGACY |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 315 | select CPU_TLB_V4WBI if MMU |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 316 | select IO_36 |
| 317 | |
Eric Miao | 49cbe78 | 2009-01-20 14:15:18 +0800 | [diff] [blame] | 318 | # Marvell PJ1 (Mohawk) |
| 319 | config CPU_MOHAWK |
| 320 | bool |
| 321 | select CPU_32v5 |
| 322 | select CPU_ABRT_EV5T |
Eric Miao | 49cbe78 | 2009-01-20 14:15:18 +0800 | [diff] [blame] | 323 | select CPU_CACHE_VIVT |
Eric Miao | 49cbe78 | 2009-01-20 14:15:18 +0800 | [diff] [blame] | 324 | select CPU_COPY_V4WB if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 325 | select CPU_CP15_MMU |
| 326 | select CPU_PABRT_LEGACY |
| 327 | select CPU_TLB_V4WBI if MMU |
Eric Miao | 49cbe78 | 2009-01-20 14:15:18 +0800 | [diff] [blame] | 328 | |
Assaf Hoffman | e50d640 | 2007-10-23 15:14:41 -0400 | [diff] [blame] | 329 | # Feroceon |
| 330 | config CPU_FEROCEON |
| 331 | bool |
Assaf Hoffman | e50d640 | 2007-10-23 15:14:41 -0400 | [diff] [blame] | 332 | select CPU_32v5 |
| 333 | select CPU_ABRT_EV5T |
| 334 | select CPU_CACHE_VIVT |
Lennert Buytenhek | 0ed1507 | 2008-04-24 01:31:45 -0400 | [diff] [blame] | 335 | select CPU_COPY_FEROCEON if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 336 | select CPU_CP15_MMU |
| 337 | select CPU_PABRT_LEGACY |
Lennert Buytenhek | 99c6dc1 | 2008-06-22 22:45:04 +0200 | [diff] [blame] | 338 | select CPU_TLB_FEROCEON if MMU |
Assaf Hoffman | e50d640 | 2007-10-23 15:14:41 -0400 | [diff] [blame] | 339 | |
Tzachi Perelstein | d910a0a | 2007-11-06 10:35:40 +0200 | [diff] [blame] | 340 | config CPU_FEROCEON_OLD_ID |
| 341 | bool "Accept early Feroceon cores with an ARM926 ID" |
| 342 | depends on CPU_FEROCEON && !CPU_ARM926T |
| 343 | default y |
| 344 | help |
| 345 | This enables the usage of some old Feroceon cores |
| 346 | for which the CPU ID is equal to the ARM926 ID. |
| 347 | Relevant for Feroceon-1850 and early Feroceon-2850. |
| 348 | |
Haojian Zhuang | a455335 | 2010-11-24 11:54:19 +0800 | [diff] [blame] | 349 | # Marvell PJ4 |
| 350 | config CPU_PJ4 |
| 351 | bool |
Haojian Zhuang | a455335 | 2010-11-24 11:54:19 +0800 | [diff] [blame] | 352 | select ARM_THUMBEE |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 353 | select CPU_V7 |
Haojian Zhuang | a455335 | 2010-11-24 11:54:19 +0800 | [diff] [blame] | 354 | |
Gregory CLEMENT | de49019 | 2012-10-03 11:58:07 +0200 | [diff] [blame] | 355 | config CPU_PJ4B |
| 356 | bool |
| 357 | select CPU_V7 |
| 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | # ARMv6 |
| 360 | config CPU_V6 |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 361 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | select CPU_32v6 |
| 363 | select CPU_ABRT_EV6 |
| 364 | select CPU_CACHE_V6 |
| 365 | select CPU_CACHE_VIPT |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 366 | select CPU_COPY_V6 if MMU |
Hyok S. Choi | fefdaa0 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 367 | select CPU_CP15_MMU |
Catalin Marinas | 7b4c965 | 2007-07-20 11:42:57 +0100 | [diff] [blame] | 368 | select CPU_HAS_ASID if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 369 | select CPU_PABRT_V6 |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 370 | select CPU_TLB_V6 if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
Russell King | 4a5f79e | 2005-11-03 15:48:21 +0000 | [diff] [blame] | 372 | # ARMv6k |
Russell King | e399b1a | 2011-01-17 15:08:32 +0000 | [diff] [blame] | 373 | config CPU_V6K |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 374 | bool |
Russell King | e399b1a | 2011-01-17 15:08:32 +0000 | [diff] [blame] | 375 | select CPU_32v6 |
Russell King | 60799c6 | 2011-01-15 16:25:04 +0000 | [diff] [blame] | 376 | select CPU_32v6K |
Russell King | e399b1a | 2011-01-17 15:08:32 +0000 | [diff] [blame] | 377 | select CPU_ABRT_EV6 |
Russell King | e399b1a | 2011-01-17 15:08:32 +0000 | [diff] [blame] | 378 | select CPU_CACHE_V6 |
| 379 | select CPU_CACHE_VIPT |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 380 | select CPU_COPY_V6 if MMU |
Russell King | e399b1a | 2011-01-17 15:08:32 +0000 | [diff] [blame] | 381 | select CPU_CP15_MMU |
| 382 | select CPU_HAS_ASID if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 383 | select CPU_PABRT_V6 |
Russell King | e399b1a | 2011-01-17 15:08:32 +0000 | [diff] [blame] | 384 | select CPU_TLB_V6 if MMU |
Russell King | 4a5f79e | 2005-11-03 15:48:21 +0000 | [diff] [blame] | 385 | |
Catalin Marinas | 23688e9 | 2007-05-08 22:45:26 +0100 | [diff] [blame] | 386 | # ARMv7 |
| 387 | config CPU_V7 |
Arnd Bergmann | 17d44d7 | 2015-11-25 17:32:21 +0100 | [diff] [blame] | 388 | bool |
Russell King | 15490ef | 2011-02-09 16:33:46 +0000 | [diff] [blame] | 389 | select CPU_32v6K |
Catalin Marinas | 23688e9 | 2007-05-08 22:45:26 +0100 | [diff] [blame] | 390 | select CPU_32v7 |
| 391 | select CPU_ABRT_EV7 |
| 392 | select CPU_CACHE_V7 |
| 393 | select CPU_CACHE_VIPT |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 394 | select CPU_COPY_V6 if MMU |
Jonathan Austin | 6656761 | 2012-07-12 14:38:46 +0100 | [diff] [blame] | 395 | select CPU_CP15_MMU if MMU |
| 396 | select CPU_CP15_MPU if !MMU |
Catalin Marinas | 2eb8c82 | 2007-07-20 11:43:02 +0100 | [diff] [blame] | 397 | select CPU_HAS_ASID if MMU |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 398 | select CPU_PABRT_V7 |
Russell King | eed96a3 | 2018-11-07 11:43:43 -0500 | [diff] [blame] | 399 | select CPU_SPECTRE if MMU |
Catalin Marinas | 2ccdd1e | 2007-05-18 11:25:31 +0100 | [diff] [blame] | 400 | select CPU_TLB_V7 if MMU |
Catalin Marinas | 23688e9 | 2007-05-08 22:45:26 +0100 | [diff] [blame] | 401 | |
Uwe Kleine-König | 4477ca4 | 2013-03-21 21:02:37 +0100 | [diff] [blame] | 402 | # ARMv7M |
| 403 | config CPU_V7M |
| 404 | bool |
| 405 | select CPU_32v7M |
| 406 | select CPU_ABRT_NOMMU |
Jonathan Austin | bc0ee9d | 2016-08-30 17:31:22 +0100 | [diff] [blame] | 407 | select CPU_CACHE_V7M |
Uwe Kleine-König | 4477ca4 | 2013-03-21 21:02:37 +0100 | [diff] [blame] | 408 | select CPU_CACHE_NOP |
| 409 | select CPU_PABRT_LEGACY |
| 410 | select CPU_THUMBONLY |
| 411 | |
Uwe Kleine-König | bc7dea0 | 2011-12-09 20:52:10 +0100 | [diff] [blame] | 412 | config CPU_THUMBONLY |
| 413 | bool |
| 414 | # There are no CPUs available with MMU that don't implement an ARM ISA: |
| 415 | depends on !MMU |
| 416 | help |
| 417 | Select this if your CPU doesn't support the 32 bit ARM instructions. |
| 418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | # Figure out what processor architecture version we should be using. |
| 420 | # This defines the compiler instruction set which depends on the machine type. |
| 421 | config CPU_32v3 |
| 422 | bool |
Russell King | 8762df4 | 2011-01-17 15:53:56 +0000 | [diff] [blame] | 423 | select CPU_USE_DOMAINS if MMU |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 424 | select NEED_KUSER_HELPERS |
Russell King | 51aaf81 | 2014-04-22 22:26:27 +0100 | [diff] [blame] | 425 | select TLS_REG_EMUL if SMP || !MMU |
Zhaoxiu Zeng | fff7fb0 | 2016-05-20 17:03:57 -0700 | [diff] [blame] | 426 | select CPU_NO_EFFICIENT_FFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
| 428 | config CPU_32v4 |
| 429 | bool |
Russell King | 8762df4 | 2011-01-17 15:53:56 +0000 | [diff] [blame] | 430 | select CPU_USE_DOMAINS if MMU |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 431 | select NEED_KUSER_HELPERS |
Russell King | 51aaf81 | 2014-04-22 22:26:27 +0100 | [diff] [blame] | 432 | select TLS_REG_EMUL if SMP || !MMU |
Zhaoxiu Zeng | fff7fb0 | 2016-05-20 17:03:57 -0700 | [diff] [blame] | 433 | select CPU_NO_EFFICIENT_FFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
Lennert Buytenhek | 260e98e | 2006-08-28 12:51:20 +0100 | [diff] [blame] | 435 | config CPU_32v4T |
| 436 | bool |
Russell King | 8762df4 | 2011-01-17 15:53:56 +0000 | [diff] [blame] | 437 | select CPU_USE_DOMAINS if MMU |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 438 | select NEED_KUSER_HELPERS |
Russell King | 51aaf81 | 2014-04-22 22:26:27 +0100 | [diff] [blame] | 439 | select TLS_REG_EMUL if SMP || !MMU |
Zhaoxiu Zeng | fff7fb0 | 2016-05-20 17:03:57 -0700 | [diff] [blame] | 440 | select CPU_NO_EFFICIENT_FFS |
Lennert Buytenhek | 260e98e | 2006-08-28 12:51:20 +0100 | [diff] [blame] | 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | config CPU_32v5 |
| 443 | bool |
Russell King | 8762df4 | 2011-01-17 15:53:56 +0000 | [diff] [blame] | 444 | select CPU_USE_DOMAINS if MMU |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 445 | select NEED_KUSER_HELPERS |
Russell King | 51aaf81 | 2014-04-22 22:26:27 +0100 | [diff] [blame] | 446 | select TLS_REG_EMUL if SMP || !MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
| 448 | config CPU_32v6 |
| 449 | bool |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 450 | select TLS_REG_EMUL if !CPU_32v6K && !MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
Russell King | e399b1a | 2011-01-17 15:08:32 +0000 | [diff] [blame] | 452 | config CPU_32v6K |
Russell King | 60799c6 | 2011-01-15 16:25:04 +0000 | [diff] [blame] | 453 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Catalin Marinas | 23688e9 | 2007-05-08 22:45:26 +0100 | [diff] [blame] | 455 | config CPU_32v7 |
| 456 | bool |
| 457 | |
Uwe Kleine-König | 4477ca4 | 2013-03-21 21:02:37 +0100 | [diff] [blame] | 458 | config CPU_32v7M |
| 459 | bool |
| 460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | # The abort model |
Hyok S. Choi | 0f45d7f | 2006-09-28 21:46:16 +0900 | [diff] [blame] | 462 | config CPU_ABRT_NOMMU |
| 463 | bool |
| 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | config CPU_ABRT_EV4 |
| 466 | bool |
| 467 | |
| 468 | config CPU_ABRT_EV4T |
| 469 | bool |
| 470 | |
| 471 | config CPU_ABRT_LV4T |
| 472 | bool |
| 473 | |
| 474 | config CPU_ABRT_EV5T |
| 475 | bool |
| 476 | |
| 477 | config CPU_ABRT_EV5TJ |
| 478 | bool |
| 479 | |
| 480 | config CPU_ABRT_EV6 |
| 481 | bool |
| 482 | |
Catalin Marinas | 23688e9 | 2007-05-08 22:45:26 +0100 | [diff] [blame] | 483 | config CPU_ABRT_EV7 |
| 484 | bool |
| 485 | |
Kirill A. Shutemov | 4fb2847 | 2009-09-25 13:39:47 +0100 | [diff] [blame] | 486 | config CPU_PABRT_LEGACY |
Paul Brook | 48d7927 | 2008-04-18 22:43:07 +0100 | [diff] [blame] | 487 | bool |
| 488 | |
Kirill A. Shutemov | 4fb2847 | 2009-09-25 13:39:47 +0100 | [diff] [blame] | 489 | config CPU_PABRT_V6 |
| 490 | bool |
| 491 | |
| 492 | config CPU_PABRT_V7 |
Paul Brook | 48d7927 | 2008-04-18 22:43:07 +0100 | [diff] [blame] | 493 | bool |
| 494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | # The cache model |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | config CPU_CACHE_V4 |
| 497 | bool |
| 498 | |
| 499 | config CPU_CACHE_V4WT |
| 500 | bool |
| 501 | |
| 502 | config CPU_CACHE_V4WB |
| 503 | bool |
| 504 | |
| 505 | config CPU_CACHE_V6 |
| 506 | bool |
| 507 | |
Catalin Marinas | 23688e9 | 2007-05-08 22:45:26 +0100 | [diff] [blame] | 508 | config CPU_CACHE_V7 |
| 509 | bool |
| 510 | |
Uwe Kleine-König | 4477ca4 | 2013-03-21 21:02:37 +0100 | [diff] [blame] | 511 | config CPU_CACHE_NOP |
| 512 | bool |
| 513 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | config CPU_CACHE_VIVT |
| 515 | bool |
| 516 | |
| 517 | config CPU_CACHE_VIPT |
| 518 | bool |
| 519 | |
Paulius Zaleckas | 28853ac | 2009-03-25 13:10:01 +0200 | [diff] [blame] | 520 | config CPU_CACHE_FA |
| 521 | bool |
| 522 | |
Jonathan Austin | bc0ee9d | 2016-08-30 17:31:22 +0100 | [diff] [blame] | 523 | config CPU_CACHE_V7M |
| 524 | bool |
| 525 | |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 526 | if MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | # The copy-page model |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | config CPU_COPY_V4WT |
| 529 | bool |
| 530 | |
| 531 | config CPU_COPY_V4WB |
| 532 | bool |
| 533 | |
Lennert Buytenhek | 0ed1507 | 2008-04-24 01:31:45 -0400 | [diff] [blame] | 534 | config CPU_COPY_FEROCEON |
| 535 | bool |
| 536 | |
Paulius Zaleckas | 28853ac | 2009-03-25 13:10:01 +0200 | [diff] [blame] | 537 | config CPU_COPY_FA |
| 538 | bool |
| 539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | config CPU_COPY_V6 |
| 541 | bool |
| 542 | |
| 543 | # This selects the TLB model |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | config CPU_TLB_V4WT |
| 545 | bool |
| 546 | help |
| 547 | ARM Architecture Version 4 TLB with writethrough cache. |
| 548 | |
| 549 | config CPU_TLB_V4WB |
| 550 | bool |
| 551 | help |
| 552 | ARM Architecture Version 4 TLB with writeback cache. |
| 553 | |
| 554 | config CPU_TLB_V4WBI |
| 555 | bool |
| 556 | help |
| 557 | ARM Architecture Version 4 TLB with writeback cache and invalidate |
| 558 | instruction cache entry. |
| 559 | |
Lennert Buytenhek | 99c6dc1 | 2008-06-22 22:45:04 +0200 | [diff] [blame] | 560 | config CPU_TLB_FEROCEON |
| 561 | bool |
| 562 | help |
| 563 | Feroceon TLB (v4wbi with non-outer-cachable page table walks). |
| 564 | |
Paulius Zaleckas | 28853ac | 2009-03-25 13:10:01 +0200 | [diff] [blame] | 565 | config CPU_TLB_FA |
| 566 | bool |
| 567 | help |
| 568 | Faraday ARM FA526 architecture, unified TLB with writeback cache |
| 569 | and invalidate instruction cache entry. Branch target buffer is |
| 570 | also supported. |
| 571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | config CPU_TLB_V6 |
| 573 | bool |
| 574 | |
Catalin Marinas | 2ccdd1e | 2007-05-18 11:25:31 +0100 | [diff] [blame] | 575 | config CPU_TLB_V7 |
| 576 | bool |
| 577 | |
Dave Estes | e220ba6 | 2009-08-11 17:58:49 -0400 | [diff] [blame] | 578 | config VERIFY_PERMISSION_FAULT |
| 579 | bool |
Hyok S. Choi | f9c21a6 | 2006-06-21 22:26:29 +0100 | [diff] [blame] | 580 | endif |
| 581 | |
Russell King | 516793c | 2007-05-17 10:19:23 +0100 | [diff] [blame] | 582 | config CPU_HAS_ASID |
| 583 | bool |
| 584 | help |
| 585 | This indicates whether the CPU has the ASID register; used to |
| 586 | tag TLB and possibly cache entries. |
| 587 | |
Hyok S. Choi | fefdaa0 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 588 | config CPU_CP15 |
| 589 | bool |
| 590 | help |
| 591 | Processor has the CP15 register. |
| 592 | |
| 593 | config CPU_CP15_MMU |
| 594 | bool |
| 595 | select CPU_CP15 |
| 596 | help |
| 597 | Processor has the CP15 register, which has MMU related registers. |
| 598 | |
| 599 | config CPU_CP15_MPU |
| 600 | bool |
| 601 | select CPU_CP15 |
| 602 | help |
| 603 | Processor has the CP15 register, which has MPU related registers. |
| 604 | |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 605 | config CPU_USE_DOMAINS |
| 606 | bool |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 607 | help |
| 608 | This option enables or disables the use of domain switching |
| 609 | via the set_fs() function. |
| 610 | |
Maxime Coquelin stm32 | 6b1814c | 2015-04-10 09:46:46 +0100 | [diff] [blame] | 611 | config CPU_V7M_NUM_IRQ |
| 612 | int "Number of external interrupts connected to the NVIC" |
| 613 | depends on CPU_V7M |
| 614 | default 90 if ARCH_STM32 |
| 615 | default 38 if ARCH_EFM32 |
Stefan Agner | 45b0fa0 | 2015-05-20 00:16:46 +0100 | [diff] [blame] | 616 | default 112 if SOC_VF610 |
Maxime Coquelin stm32 | 6b1814c | 2015-04-10 09:46:46 +0100 | [diff] [blame] | 617 | default 240 |
| 618 | help |
| 619 | This option indicates the number of interrupts connected to the NVIC. |
| 620 | The value can be larger than the real number of interrupts supported |
| 621 | by the system, but must not be lower. |
| 622 | The default value is 240, corresponding to the maximum number of |
| 623 | interrupts supported by the NVIC on Cortex-M family. |
| 624 | |
| 625 | If unsure, keep default value. |
| 626 | |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 627 | # |
| 628 | # CPU supports 36-bit I/O |
| 629 | # |
| 630 | config IO_36 |
| 631 | bool |
| 632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | comment "Processor Features" |
| 634 | |
Catalin Marinas | 497b7e9 | 2011-11-22 17:30:32 +0000 | [diff] [blame] | 635 | config ARM_LPAE |
| 636 | bool "Support for the Large Physical Address Extension" |
Catalin Marinas | 08a183f | 2012-02-14 16:33:27 +0100 | [diff] [blame] | 637 | depends on MMU && CPU_32v7 && !CPU_32v6 && !CPU_32v5 && \ |
| 638 | !CPU_32v4 && !CPU_32v3 |
Catalin Marinas | 497b7e9 | 2011-11-22 17:30:32 +0000 | [diff] [blame] | 639 | help |
| 640 | Say Y if you have an ARMv7 processor supporting the LPAE page |
| 641 | table format and you would like to access memory beyond the |
| 642 | 4GB limit. The resulting kernel image will not run on |
| 643 | processors without the LPA extension. |
| 644 | |
| 645 | If unsure, say N. |
| 646 | |
Russell King | d8dc7fb | 2015-04-04 16:58:38 +0100 | [diff] [blame] | 647 | config ARM_PV_FIXUP |
| 648 | def_bool y |
| 649 | depends on ARM_LPAE && ARM_PATCH_PHYS_VIRT && ARCH_KEYSTONE |
| 650 | |
Catalin Marinas | 497b7e9 | 2011-11-22 17:30:32 +0000 | [diff] [blame] | 651 | config ARCH_PHYS_ADDR_T_64BIT |
| 652 | def_bool ARM_LPAE |
| 653 | |
| 654 | config ARCH_DMA_ADDR_T_64BIT |
| 655 | bool |
| 656 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | config ARM_THUMB |
Uwe Kleine-König | bc7dea0 | 2011-12-09 20:52:10 +0100 | [diff] [blame] | 658 | bool "Support Thumb user binaries" if !CPU_THUMBONLY |
Uwe Kleine-König | 4477ca4 | 2013-03-21 21:02:37 +0100 | [diff] [blame] | 659 | depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || \ |
| 660 | CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || \ |
| 661 | CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ |
| 662 | CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_V6 || CPU_V6K || \ |
| 663 | CPU_V7 || CPU_FEROCEON || CPU_V7M |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | default y |
| 665 | help |
| 666 | Say Y if you want to include kernel support for running user space |
| 667 | Thumb binaries. |
| 668 | |
| 669 | The Thumb instruction set is a compressed form of the standard ARM |
| 670 | instruction set resulting in smaller binaries at the expense of |
| 671 | slightly less efficient code. |
| 672 | |
| 673 | If you don't know what this all is, saying Y is a safe choice. |
| 674 | |
Catalin Marinas | d7f864b | 2008-04-18 22:43:06 +0100 | [diff] [blame] | 675 | config ARM_THUMBEE |
| 676 | bool "Enable ThumbEE CPU extension" |
| 677 | depends on CPU_V7 |
| 678 | help |
| 679 | Say Y here if you have a CPU with the ThumbEE extension and code to |
| 680 | make use of it. Say N for code that can run on CPUs without ThumbEE. |
| 681 | |
Dave Martin | 5b6728d | 2012-02-17 16:54:28 +0000 | [diff] [blame] | 682 | config ARM_VIRT_EXT |
Will Deacon | 651134b | 2013-01-09 14:29:33 +0000 | [diff] [blame] | 683 | bool |
| 684 | depends on MMU |
| 685 | default y if CPU_V7 |
Dave Martin | 5b6728d | 2012-02-17 16:54:28 +0000 | [diff] [blame] | 686 | help |
| 687 | Enable the kernel to make use of the ARM Virtualization |
| 688 | Extensions to install hypervisors without run-time firmware |
| 689 | assistance. |
| 690 | |
| 691 | A compliant bootloader is required in order to make maximum |
| 692 | use of this feature. Refer to Documentation/arm/Booting for |
| 693 | details. |
| 694 | |
Leif Lindholm | 64d2dc3 | 2010-09-16 18:00:47 +0100 | [diff] [blame] | 695 | config SWP_EMULATE |
Russell King | a11dd73 | 2014-07-04 14:44:36 +0100 | [diff] [blame] | 696 | bool "Emulate SWP/SWPB instructions" if !SMP |
Will Deacon | b6ccb98 | 2014-02-07 19:12:27 +0100 | [diff] [blame] | 697 | depends on CPU_V7 |
Leif Lindholm | 64d2dc3 | 2010-09-16 18:00:47 +0100 | [diff] [blame] | 698 | default y if SMP |
Russell King | b1b3f49 | 2012-10-06 17:12:25 +0100 | [diff] [blame] | 699 | select HAVE_PROC_CPU if PROC_FS |
Leif Lindholm | 64d2dc3 | 2010-09-16 18:00:47 +0100 | [diff] [blame] | 700 | help |
| 701 | ARMv6 architecture deprecates use of the SWP/SWPB instructions. |
| 702 | ARMv7 multiprocessing extensions introduce the ability to disable |
| 703 | these instructions, triggering an undefined instruction exception |
| 704 | when executed. Say Y here to enable software emulation of these |
| 705 | instructions for userspace (not kernel) using LDREX/STREX. |
| 706 | Also creates /proc/cpu/swp_emulation for statistics. |
| 707 | |
| 708 | In some older versions of glibc [<=2.8] SWP is used during futex |
| 709 | trylock() operations with the assumption that the code will not |
| 710 | be preempted. This invalid assumption may be more likely to fail |
| 711 | with SWP emulation enabled, leading to deadlock of the user |
| 712 | application. |
| 713 | |
| 714 | NOTE: when accessing uncached shared regions, LDREX/STREX rely |
| 715 | on an external transaction monitoring block called a global |
| 716 | monitor to maintain update atomicity. If your system does not |
| 717 | implement a global monitor, this option can cause programs that |
| 718 | perform SWP operations to uncached memory to deadlock. |
| 719 | |
| 720 | If unsure, say Y. |
| 721 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | config CPU_BIG_ENDIAN |
| 723 | bool "Build big-endian kernel" |
| 724 | depends on ARCH_SUPPORTS_BIG_ENDIAN |
| 725 | help |
| 726 | Say Y if you plan on running a kernel in big-endian mode. |
| 727 | Note that your board must be properly built and your board |
| 728 | port must properly enable any big-endian related features |
| 729 | of your chipset/board/processor. |
| 730 | |
Catalin Marinas | 2658485 | 2009-05-30 14:00:18 +0100 | [diff] [blame] | 731 | config CPU_ENDIAN_BE8 |
| 732 | bool |
| 733 | depends on CPU_BIG_ENDIAN |
Russell King | e399b1a | 2011-01-17 15:08:32 +0000 | [diff] [blame] | 734 | default CPU_V6 || CPU_V6K || CPU_V7 |
Catalin Marinas | 2658485 | 2009-05-30 14:00:18 +0100 | [diff] [blame] | 735 | help |
| 736 | Support for the BE-8 (big-endian) mode on ARMv6 and ARMv7 processors. |
| 737 | |
| 738 | config CPU_ENDIAN_BE32 |
| 739 | bool |
| 740 | depends on CPU_BIG_ENDIAN |
| 741 | default !CPU_ENDIAN_BE8 |
| 742 | help |
| 743 | Support for the BE-32 (big-endian) mode on pre-ARMv6 processors. |
| 744 | |
Hyok S. Choi | 6afd6fa | 2006-09-28 21:46:34 +0900 | [diff] [blame] | 745 | config CPU_HIGH_VECTOR |
Robert P. J. Day | 6340aa6 | 2007-02-17 19:05:24 +0100 | [diff] [blame] | 746 | depends on !MMU && CPU_CP15 && !CPU_ARM740T |
Hyok S. Choi | 6afd6fa | 2006-09-28 21:46:34 +0900 | [diff] [blame] | 747 | bool "Select the High exception vector" |
Hyok S. Choi | 6afd6fa | 2006-09-28 21:46:34 +0900 | [diff] [blame] | 748 | help |
| 749 | Say Y here to select high exception vector(0xFFFF0000~). |
Will Deacon | 9b7333a | 2012-04-12 17:12:37 +0100 | [diff] [blame] | 750 | The exception vector can vary depending on the platform |
Hyok S. Choi | 6afd6fa | 2006-09-28 21:46:34 +0900 | [diff] [blame] | 751 | design in nommu mode. If your platform needs to select |
| 752 | high exception vector, say Y. |
| 753 | Otherwise or if you are unsure, say N, and the low exception |
| 754 | vector (0x00000000~) will be used. |
| 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | config CPU_ICACHE_DISABLE |
Hyok S. Choi | f12d0d7 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 757 | bool "Disable I-Cache (I-bit)" |
Jonathan Austin | bc0ee9d | 2016-08-30 17:31:22 +0100 | [diff] [blame] | 758 | depends on (CPU_CP15 && !(CPU_ARM720T || CPU_ARM740T || CPU_XSCALE || CPU_XSC3)) || CPU_V7M |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | help |
| 760 | Say Y here to disable the processor instruction cache. Unless |
| 761 | you have a reason not to or are unsure, say N. |
| 762 | |
| 763 | config CPU_DCACHE_DISABLE |
Hyok S. Choi | f12d0d7 | 2006-09-26 17:36:37 +0900 | [diff] [blame] | 764 | bool "Disable D-Cache (C-bit)" |
Jonathan Austin | bc0ee9d | 2016-08-30 17:31:22 +0100 | [diff] [blame] | 765 | depends on (CPU_CP15 && !SMP) || CPU_V7M |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | help |
| 767 | Say Y here to disable the processor data cache. Unless |
| 768 | you have a reason not to or are unsure, say N. |
| 769 | |
Hyok S. Choi | f37f46e | 2006-09-26 17:38:32 +0900 | [diff] [blame] | 770 | config CPU_DCACHE_SIZE |
| 771 | hex |
| 772 | depends on CPU_ARM740T || CPU_ARM946E |
| 773 | default 0x00001000 if CPU_ARM740T |
| 774 | default 0x00002000 # default size for ARM946E-S |
| 775 | help |
| 776 | Some cores are synthesizable to have various sized cache. For |
| 777 | ARM946E-S case, it can vary from 0KB to 1MB. |
| 778 | To support such cache operations, it is efficient to know the size |
| 779 | before compile time. |
| 780 | If your SoC is configured to have a different size, define the value |
| 781 | here with proper conditions. |
| 782 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | config CPU_DCACHE_WRITETHROUGH |
| 784 | bool "Force write through D-cache" |
Paulius Zaleckas | 28853ac | 2009-03-25 13:10:01 +0200 | [diff] [blame] | 785 | depends on (CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || CPU_ARM1020 || CPU_FA526) && !CPU_DCACHE_DISABLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | default y if CPU_ARM925T |
| 787 | help |
| 788 | Say Y here to use the data cache in writethrough mode. Unless you |
| 789 | specifically require this or are unsure, say N. |
| 790 | |
| 791 | config CPU_CACHE_ROUND_ROBIN |
| 792 | bool "Round robin I and D cache replacement algorithm" |
Hyok S. Choi | f37f46e | 2006-09-26 17:38:32 +0900 | [diff] [blame] | 793 | depends on (CPU_ARM926T || CPU_ARM946E || CPU_ARM1020) && (!CPU_ICACHE_DISABLE || !CPU_DCACHE_DISABLE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | help |
| 795 | Say Y here to use the predictable round-robin cache replacement |
| 796 | policy. Unless you specifically require this or are unsure, say N. |
| 797 | |
| 798 | config CPU_BPREDICT_DISABLE |
| 799 | bool "Disable branch prediction" |
Jonathan Austin | bc0ee9d | 2016-08-30 17:31:22 +0100 | [diff] [blame] | 800 | depends on CPU_ARM1020 || CPU_V6 || CPU_V6K || CPU_MOHAWK || CPU_XSC3 || CPU_V7 || CPU_FA526 || CPU_V7M |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | help |
| 802 | Say Y here to disable branch prediction. If unsure, say N. |
Nicolas Pitre | 2d2669b | 2005-04-29 22:08:33 +0100 | [diff] [blame] | 803 | |
Russell King | eed96a3 | 2018-11-07 11:43:43 -0500 | [diff] [blame] | 804 | config CPU_SPECTRE |
| 805 | bool |
| 806 | |
Russell King | 33efd46 | 2018-11-07 11:43:44 -0500 | [diff] [blame] | 807 | config HARDEN_BRANCH_PREDICTOR |
| 808 | bool "Harden the branch predictor against aliasing attacks" if EXPERT |
| 809 | depends on CPU_SPECTRE |
| 810 | default y |
| 811 | help |
| 812 | Speculation attacks against some high-performance processors rely |
| 813 | on being able to manipulate the branch predictor for a victim |
| 814 | context by executing aliasing branches in the attacker context. |
| 815 | Such attacks can be partially mitigated against by clearing |
| 816 | internal branch predictor state and limiting the prediction |
| 817 | logic in some situations. |
| 818 | |
| 819 | This config option will take CPU-specific actions to harden |
| 820 | the branch predictor against aliasing attacks and may rely on |
| 821 | specific instruction sequences or control bits being set by |
| 822 | the system firmware. |
| 823 | |
| 824 | If unsure, say Y. |
| 825 | |
Nicolas Pitre | 4b0e07a | 2005-05-05 23:24:45 +0100 | [diff] [blame] | 826 | config TLS_REG_EMUL |
| 827 | bool |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 828 | select NEED_KUSER_HELPERS |
Nicolas Pitre | 4b0e07a | 2005-05-05 23:24:45 +0100 | [diff] [blame] | 829 | help |
Nicolas Pitre | 70489c8 | 2005-05-12 19:27:12 +0100 | [diff] [blame] | 830 | An SMP system using a pre-ARMv6 processor (there are apparently |
| 831 | a few prototypes like that in existence) and therefore access to |
| 832 | that required register must be emulated. |
Nicolas Pitre | 4b0e07a | 2005-05-05 23:24:45 +0100 | [diff] [blame] | 833 | |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 834 | config NEED_KUSER_HELPERS |
| 835 | bool |
| 836 | |
| 837 | config KUSER_HELPERS |
| 838 | bool "Enable kuser helpers in vector page" if !NEED_KUSER_HELPERS |
Nathan Lynch | 08b964f | 2014-11-10 23:46:27 +0100 | [diff] [blame] | 839 | depends on MMU |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 840 | default y |
| 841 | help |
| 842 | Warning: disabling this option may break user programs. |
| 843 | |
| 844 | Provide kuser helpers in the vector page. The kernel provides |
| 845 | helper code to userspace in read only form at a fixed location |
| 846 | in the high vector page to allow userspace to be independent of |
| 847 | the CPU type fitted to the system. This permits binaries to be |
| 848 | run on ARMv4 through to ARMv7 without modification. |
| 849 | |
Nicolas Pitre | ac12450 | 2013-08-14 22:36:32 +0100 | [diff] [blame] | 850 | See Documentation/arm/kernel_user_helpers.txt for details. |
| 851 | |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 852 | However, the fixed address nature of these helpers can be used |
| 853 | by ROP (return orientated programming) authors when creating |
| 854 | exploits. |
| 855 | |
| 856 | If all of the binaries and libraries which run on your platform |
| 857 | are built specifically for your platform, and make no use of |
Nicolas Pitre | ac12450 | 2013-08-14 22:36:32 +0100 | [diff] [blame] | 858 | these helpers, then you can turn this option off to hinder |
| 859 | such exploits. However, in that case, if a binary or library |
| 860 | relying on those helpers is run, it will receive a SIGILL signal, |
| 861 | which will terminate the program. |
Russell King | f6f91b0 | 2013-07-23 18:37:00 +0100 | [diff] [blame] | 862 | |
| 863 | Say N here only if you are absolutely certain that you do not |
| 864 | need these helpers; otherwise, the safe option is to say Y. |
| 865 | |
Nathan Lynch | e5b61de | 2015-03-25 19:16:05 +0100 | [diff] [blame] | 866 | config VDSO |
| 867 | bool "Enable VDSO for acceleration of some system calls" |
Nathan Lynch | 5d38000 | 2015-04-17 21:51:38 +0100 | [diff] [blame] | 868 | depends on AEABI && MMU && CPU_V7 |
Nathan Lynch | e5b61de | 2015-03-25 19:16:05 +0100 | [diff] [blame] | 869 | default y if ARM_ARCH_TIMER |
| 870 | select GENERIC_TIME_VSYSCALL |
| 871 | help |
| 872 | Place in the process address space an ELF shared object |
| 873 | providing fast implementations of gettimeofday and |
| 874 | clock_gettime. Systems that implement the ARM architected |
| 875 | timer will receive maximum benefit. |
| 876 | |
| 877 | You must have glibc 2.22 or later for programs to seamlessly |
| 878 | take advantage of this. |
| 879 | |
Catalin Marinas | ad642d9 | 2010-06-21 15:10:07 +0100 | [diff] [blame] | 880 | config DMA_CACHE_RWFO |
| 881 | bool "Enable read/write for ownership DMA cache maintenance" |
Russell King | 3bc28c8 | 2011-01-18 13:30:33 +0000 | [diff] [blame] | 882 | depends on CPU_V6K && SMP |
Catalin Marinas | ad642d9 | 2010-06-21 15:10:07 +0100 | [diff] [blame] | 883 | default y |
| 884 | help |
| 885 | The Snoop Control Unit on ARM11MPCore does not detect the |
| 886 | cache maintenance operations and the dma_{map,unmap}_area() |
| 887 | functions may leave stale cache entries on other CPUs. By |
| 888 | enabling this option, Read or Write For Ownership in the ARMv6 |
| 889 | DMA cache maintenance functions is performed. These LDR/STR |
| 890 | instructions change the cache line state to shared or modified |
| 891 | so that the cache operation has the desired effect. |
| 892 | |
| 893 | Note that the workaround is only valid on processors that do |
| 894 | not perform speculative loads into the D-cache. For such |
| 895 | processors, if cache maintenance operations are not broadcast |
| 896 | in hardware, other workarounds are needed (e.g. cache |
| 897 | maintenance broadcasting in software via FIQ). |
| 898 | |
Catalin Marinas | 953233d | 2007-02-05 14:48:08 +0100 | [diff] [blame] | 899 | config OUTER_CACHE |
| 900 | bool |
Catalin Marinas | 382266a | 2007-02-05 14:48:19 +0100 | [diff] [blame] | 901 | |
Catalin Marinas | 319f551 | 2010-03-24 16:47:53 +0100 | [diff] [blame] | 902 | config OUTER_CACHE_SYNC |
| 903 | bool |
Russell King | f813090 | 2015-06-01 23:44:46 +0100 | [diff] [blame] | 904 | select ARM_HEAVY_MB |
Catalin Marinas | 319f551 | 2010-03-24 16:47:53 +0100 | [diff] [blame] | 905 | help |
| 906 | The outer cache has a outer_cache_fns.sync function pointer |
| 907 | that can be used to drain the write buffer of the outer cache. |
| 908 | |
Lennert Buytenhek | 99c6dc1 | 2008-06-22 22:45:04 +0200 | [diff] [blame] | 909 | config CACHE_FEROCEON_L2 |
| 910 | bool "Enable the Feroceon L2 cache controller" |
Andrew Lunn | ba364fc | 2014-07-10 23:36:21 +0200 | [diff] [blame] | 911 | depends on ARCH_MV78XX0 || ARCH_MVEBU |
Lennert Buytenhek | 99c6dc1 | 2008-06-22 22:45:04 +0200 | [diff] [blame] | 912 | default y |
Catalin Marinas | 382266a | 2007-02-05 14:48:19 +0100 | [diff] [blame] | 913 | select OUTER_CACHE |
Lennert Buytenhek | 99c6dc1 | 2008-06-22 22:45:04 +0200 | [diff] [blame] | 914 | help |
| 915 | This option enables the Feroceon L2 cache controller. |
| 916 | |
Ronen Shitrit | 4360bb4 | 2008-09-23 15:28:10 +0300 | [diff] [blame] | 917 | config CACHE_FEROCEON_L2_WRITETHROUGH |
| 918 | bool "Force Feroceon L2 cache write through" |
| 919 | depends on CACHE_FEROCEON_L2 |
Ronen Shitrit | 4360bb4 | 2008-09-23 15:28:10 +0300 | [diff] [blame] | 920 | help |
| 921 | Say Y here to use the Feroceon L2 cache in writethrough mode. |
| 922 | Unless you specifically require this, say N for writeback mode. |
| 923 | |
Dave Martin | ce5ea9f | 2011-11-29 15:56:19 +0000 | [diff] [blame] | 924 | config MIGHT_HAVE_CACHE_L2X0 |
| 925 | bool |
| 926 | help |
| 927 | This option should be selected by machines which have a L2x0 |
| 928 | or PL310 cache controller, but where its use is optional. |
| 929 | |
| 930 | The only effect of this option is to make CACHE_L2X0 and |
| 931 | related options available to the user for configuration. |
| 932 | |
| 933 | Boards or SoCs which always require the cache controller |
| 934 | support to be present should select CACHE_L2X0 directly |
| 935 | instead of this option, thus preventing the user from |
| 936 | inadvertently configuring a broken kernel. |
| 937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | config CACHE_L2X0 |
Dave Martin | ce5ea9f | 2011-11-29 15:56:19 +0000 | [diff] [blame] | 939 | bool "Enable the L2x0 outer cache controller" if MIGHT_HAVE_CACHE_L2X0 |
| 940 | default MIGHT_HAVE_CACHE_L2X0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | select OUTER_CACHE |
Catalin Marinas | 23107c5 | 2010-03-24 16:48:53 +0100 | [diff] [blame] | 942 | select OUTER_CACHE_SYNC |
Catalin Marinas | ba92795 | 2008-04-18 22:43:17 +0100 | [diff] [blame] | 943 | help |
| 944 | This option enables the L2x0 PrimeCell. |
Eric Miao | 905a09d | 2008-06-06 16:34:03 +0800 | [diff] [blame] | 945 | |
Mark Rutland | b828f96 | 2016-09-02 10:35:18 +0100 | [diff] [blame] | 946 | config CACHE_L2X0_PMU |
| 947 | bool "L2x0 performance monitor support" if CACHE_L2X0 |
| 948 | depends on PERF_EVENTS |
| 949 | help |
| 950 | This option enables support for the performance monitoring features |
| 951 | of the L220 and PL310 outer cache controllers. |
| 952 | |
Russell King | a641f3a | 2014-06-19 10:19:10 +0100 | [diff] [blame] | 953 | if CACHE_L2X0 |
| 954 | |
Russell King | c0fe18b | 2014-03-16 12:12:11 +0000 | [diff] [blame] | 955 | config PL310_ERRATA_588369 |
| 956 | bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines" |
Russell King | c0fe18b | 2014-03-16 12:12:11 +0000 | [diff] [blame] | 957 | help |
| 958 | The PL310 L2 cache controller implements three types of Clean & |
| 959 | Invalidate maintenance operations: by Physical Address |
| 960 | (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC). |
| 961 | They are architecturally defined to behave as the execution of a |
| 962 | clean operation followed immediately by an invalidate operation, |
| 963 | both performing to the same memory location. This functionality |
Shawn Guo | 80d3cb9 | 2014-07-08 02:59:42 +0100 | [diff] [blame] | 964 | is not correctly implemented in PL310 prior to r2p0 (fixed in r2p0) |
| 965 | as clean lines are not invalidated as a result of these operations. |
Russell King | c0fe18b | 2014-03-16 12:12:11 +0000 | [diff] [blame] | 966 | |
| 967 | config PL310_ERRATA_727915 |
| 968 | bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption" |
Russell King | c0fe18b | 2014-03-16 12:12:11 +0000 | [diff] [blame] | 969 | help |
| 970 | PL310 implements the Clean & Invalidate by Way L2 cache maintenance |
| 971 | operation (offset 0x7FC). This operation runs in background so that |
| 972 | PL310 can handle normal accesses while it is in progress. Under very |
| 973 | rare circumstances, due to this erratum, write data can be lost when |
| 974 | PL310 treats a cacheable write transaction during a Clean & |
Shawn Guo | 80d3cb9 | 2014-07-08 02:59:42 +0100 | [diff] [blame] | 975 | Invalidate by Way operation. Revisions prior to r3p1 are affected by |
| 976 | this errata (fixed in r3p1). |
Russell King | c0fe18b | 2014-03-16 12:12:11 +0000 | [diff] [blame] | 977 | |
| 978 | config PL310_ERRATA_753970 |
| 979 | bool "PL310 errata: cache sync operation may be faulty" |
Russell King | c0fe18b | 2014-03-16 12:12:11 +0000 | [diff] [blame] | 980 | help |
| 981 | This option enables the workaround for the 753970 PL310 (r3p0) erratum. |
| 982 | |
| 983 | Under some condition the effect of cache sync operation on |
| 984 | the store buffer still remains when the operation completes. |
| 985 | This means that the store buffer is always asked to drain and |
| 986 | this prevents it from merging any further writes. The workaround |
| 987 | is to replace the normal offset of cache sync operation (0x730) |
| 988 | by another offset targeting an unmapped PL310 register 0x740. |
| 989 | This has the same effect as the cache sync operation: store buffer |
| 990 | drain and waiting for all buffers empty. |
| 991 | |
| 992 | config PL310_ERRATA_769419 |
| 993 | bool "PL310 errata: no automatic Store Buffer drain" |
Russell King | c0fe18b | 2014-03-16 12:12:11 +0000 | [diff] [blame] | 994 | help |
| 995 | On revisions of the PL310 prior to r3p2, the Store Buffer does |
| 996 | not automatically drain. This can cause normal, non-cacheable |
| 997 | writes to be retained when the memory system is idle, leading |
| 998 | to suboptimal I/O performance for drivers using coherent DMA. |
| 999 | This option adds a write barrier to the cpu_idle loop so that, |
| 1000 | on systems with an outer cache, the store buffer is drained |
| 1001 | explicitly. |
| 1002 | |
Russell King | a641f3a | 2014-06-19 10:19:10 +0100 | [diff] [blame] | 1003 | endif |
| 1004 | |
Lennert Buytenhek | 573a652 | 2009-11-24 19:33:52 +0200 | [diff] [blame] | 1005 | config CACHE_TAUROS2 |
| 1006 | bool "Enable the Tauros2 L2 cache controller" |
Haojian Zhuang | 3f408fa | 2010-11-24 11:54:21 +0800 | [diff] [blame] | 1007 | depends on (ARCH_DOVE || ARCH_MMP || CPU_PJ4) |
Lennert Buytenhek | 573a652 | 2009-11-24 19:33:52 +0200 | [diff] [blame] | 1008 | default y |
| 1009 | select OUTER_CACHE |
| 1010 | help |
| 1011 | This option enables the Tauros2 L2 cache controller (as |
| 1012 | found on PJ1/PJ4). |
| 1013 | |
Masahiro Yamada | e7ecbc0 | 2015-10-02 13:42:19 +0900 | [diff] [blame] | 1014 | config CACHE_UNIPHIER |
| 1015 | bool "Enable the UniPhier outer cache controller" |
| 1016 | depends on ARCH_UNIPHIER |
| 1017 | default y |
| 1018 | select OUTER_CACHE |
| 1019 | select OUTER_CACHE_SYNC |
| 1020 | help |
| 1021 | This option enables the UniPhier outer cache (system cache) |
| 1022 | controller. |
| 1023 | |
Eric Miao | 905a09d | 2008-06-06 16:34:03 +0800 | [diff] [blame] | 1024 | config CACHE_XSC3L2 |
| 1025 | bool "Enable the L2 cache on XScale3" |
| 1026 | depends on CPU_XSC3 |
| 1027 | default y |
| 1028 | select OUTER_CACHE |
| 1029 | help |
| 1030 | This option enables the L2 cache on XScale3. |
Kirill A. Shutemov | 910a17e | 2009-09-15 10:23:53 +0100 | [diff] [blame] | 1031 | |
Russell King | 5637a12 | 2011-02-14 15:55:45 +0000 | [diff] [blame] | 1032 | config ARM_L1_CACHE_SHIFT_6 |
| 1033 | bool |
Will Deacon | a092f2b | 2012-01-20 12:01:10 +0100 | [diff] [blame] | 1034 | default y if CPU_V7 |
Russell King | 5637a12 | 2011-02-14 15:55:45 +0000 | [diff] [blame] | 1035 | help |
| 1036 | Setting ARM L1 cache line size to 64 Bytes. |
| 1037 | |
Kirill A. Shutemov | 910a17e | 2009-09-15 10:23:53 +0100 | [diff] [blame] | 1038 | config ARM_L1_CACHE_SHIFT |
| 1039 | int |
Kukjin Kim | d6d502f | 2010-02-22 00:02:59 +0100 | [diff] [blame] | 1040 | default 6 if ARM_L1_CACHE_SHIFT_6 |
Kirill A. Shutemov | 910a17e | 2009-09-15 10:23:53 +0100 | [diff] [blame] | 1041 | default 5 |
Russell King | 47ab0de | 2010-05-15 11:02:43 +0100 | [diff] [blame] | 1042 | |
| 1043 | config ARM_DMA_MEM_BUFFERABLE |
Russell King | e399b1a | 2011-01-17 15:08:32 +0000 | [diff] [blame] | 1044 | bool "Use non-cacheable memory for DMA" if (CPU_V6 || CPU_V6K) && !CPU_V7 |
Russell King | e399b1a | 2011-01-17 15:08:32 +0000 | [diff] [blame] | 1045 | default y if CPU_V6 || CPU_V6K || CPU_V7 |
Russell King | 47ab0de | 2010-05-15 11:02:43 +0100 | [diff] [blame] | 1046 | help |
| 1047 | Historically, the kernel has used strongly ordered mappings to |
| 1048 | provide DMA coherent memory. With the advent of ARMv7, mapping |
| 1049 | memory with differing types results in unpredictable behaviour, |
| 1050 | so on these CPUs, this option is forced on. |
| 1051 | |
| 1052 | Multiple mappings with differing attributes is also unpredictable |
| 1053 | on ARMv6 CPUs, but since they do not have aggressive speculative |
| 1054 | prefetch, no harm appears to occur. |
| 1055 | |
| 1056 | However, drivers may be missing the necessary barriers for ARMv6, |
| 1057 | and therefore turning this on may result in unpredictable driver |
| 1058 | behaviour. Therefore, we offer this as an option. |
| 1059 | |
| 1060 | You are recommended say 'Y' here and debug any affected drivers. |
Russell King | ac1d426 | 2010-05-17 17:24:04 +0100 | [diff] [blame] | 1061 | |
Russell King | f813090 | 2015-06-01 23:44:46 +0100 | [diff] [blame] | 1062 | config ARM_HEAVY_MB |
| 1063 | bool |
| 1064 | |
Ben Dooks | d10d2d4 | 2013-02-01 09:41:37 +0000 | [diff] [blame] | 1065 | config ARCH_SUPPORTS_BIG_ENDIAN |
| 1066 | bool |
| 1067 | help |
| 1068 | This option specifies the architecture can support big endian |
| 1069 | operation. |
Kees Cook | 1e6b481 | 2014-04-03 17:28:11 -0700 | [diff] [blame] | 1070 | |
Kees Cook | 80d6b0c | 2014-04-03 13:29:50 -0700 | [diff] [blame] | 1071 | config DEBUG_RODATA |
| 1072 | bool "Make kernel text and rodata read-only" |
Arnd Bergmann | ac96680 | 2016-02-19 16:41:54 +0100 | [diff] [blame] | 1073 | depends on MMU && !XIP_KERNEL |
Kees Cook | 25362dc | 2016-01-26 01:19:36 +0100 | [diff] [blame] | 1074 | default y if CPU_V7 |
| 1075 | help |
| 1076 | If this is set, kernel text and rodata memory will be made |
| 1077 | read-only, and non-text kernel memory will be made non-executable. |
| 1078 | The tradeoff is that each region is padded to section-size (1MiB) |
| 1079 | boundaries (because their permissions are different and splitting |
| 1080 | the 1M pages into 4K ones causes TLB performance problems), which |
| 1081 | can waste memory. |
| 1082 | |
| 1083 | config DEBUG_ALIGN_RODATA |
| 1084 | bool "Make rodata strictly non-executable" |
| 1085 | depends on DEBUG_RODATA |
Kees Cook | 80d6b0c | 2014-04-03 13:29:50 -0700 | [diff] [blame] | 1086 | default y |
| 1087 | help |
Kees Cook | 25362dc | 2016-01-26 01:19:36 +0100 | [diff] [blame] | 1088 | If this is set, rodata will be made explicitly non-executable. This |
| 1089 | provides protection on the rare chance that attackers might find and |
| 1090 | use ROP gadgets that exist in the rodata section. This adds an |
| 1091 | additional section-aligned split of rodata from kernel text so it |
| 1092 | can be made explicitly non-executable. This padding may waste memory |
| 1093 | space to gain the additional protection. |
Teng Fei Fan | ae3d0ee | 2018-06-05 10:50:32 +0800 | [diff] [blame] | 1094 | |
| 1095 | config HARDEN_BRANCH_PREDICTOR |
| 1096 | bool "Harden the branch predictor against aliasing attacks" if EXPERT |
| 1097 | default y |
| 1098 | help |
| 1099 | Speculation attacks against some high-performance processors rely on |
| 1100 | being able to manipulate the branch predictor for a victim context by |
| 1101 | executing aliasing branches in the attacker context. Such attacks |
| 1102 | can be partially mitigated against by clearing internal branch |
| 1103 | predictor state and limiting the prediction logic in some situations. |
| 1104 | |
| 1105 | This config option will take CPU-specific actions to harden the |
| 1106 | branch predictor against aliasing attacks and may rely on specific |
| 1107 | instruction sequences or control bits being set by the system |
| 1108 | firmware. |
| 1109 | |
| 1110 | If unsure, say Y. |