1# SPDX-License-Identifier: GPL-2.0-only 2# 3# For a description of the syntax of this configuration file, 4# see Documentation/kbuild/kconfig-language.rst. 5# 6 7config 64BIT 8 bool 9 10config 32BIT 11 bool 12 13config RISCV 14 def_bool y 15 # even on 32-bit, physical (and DMA) addresses are > 32-bits 16 select PHYS_ADDR_T_64BIT 17 select OF 18 select OF_EARLY_FLATTREE 19 select OF_IRQ 20 select ARCH_HAS_BINFMT_FLAT 21 select ARCH_WANT_FRAME_POINTERS 22 select CLONE_BACKWARDS 23 select COMMON_CLK 24 select GENERIC_CLOCKEVENTS 25 select GENERIC_CPU_DEVICES 26 select GENERIC_IRQ_SHOW 27 select GENERIC_PCI_IOMAP 28 select GENERIC_SCHED_CLOCK 29 select GENERIC_STRNCPY_FROM_USER if MMU 30 select GENERIC_STRNLEN_USER if MMU 31 select GENERIC_SMP_IDLE_THREAD 32 select GENERIC_ATOMIC64 if !64BIT 33 select HAVE_ARCH_AUDITSYSCALL 34 select HAVE_ASM_MODVERSIONS 35 select HAVE_MEMBLOCK_NODE_MAP 36 select HAVE_DMA_CONTIGUOUS if MMU 37 select HAVE_FUTEX_CMPXCHG if FUTEX 38 select HAVE_PERF_EVENTS 39 select HAVE_PERF_REGS 40 select HAVE_PERF_USER_STACK_DUMP 41 select HAVE_SYSCALL_TRACEPOINTS 42 select IRQ_DOMAIN 43 select SPARSE_IRQ 44 select SYSCTL_EXCEPTION_TRACE 45 select HAVE_ARCH_TRACEHOOK 46 select HAVE_PCI 47 select MODULES_USE_ELF_RELA if MODULES 48 select MODULE_SECTIONS if MODULES 49 select THREAD_INFO_IN_TASK 50 select PCI_DOMAINS_GENERIC if PCI 51 select PCI_MSI if PCI 52 select RISCV_TIMER 53 select UACCESS_MEMCPY if !MMU 54 select GENERIC_IRQ_MULTI_HANDLER 55 select GENERIC_ARCH_TOPOLOGY if SMP 56 select ARCH_HAS_PTE_SPECIAL 57 select ARCH_HAS_MMIOWB 58 select HAVE_EBPF_JIT if 64BIT 59 select EDAC_SUPPORT 60 select ARCH_HAS_GIGANTIC_PAGE 61 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 62 select SPARSEMEM_STATIC if 32BIT 63 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU 64 select HAVE_ARCH_MMAP_RND_BITS if MMU 65 66config ARCH_MMAP_RND_BITS_MIN 67 default 18 if 64BIT 68 default 8 69 70# max bits determined by the following formula: 71# VA_BITS - PAGE_SHIFT - 3 72config ARCH_MMAP_RND_BITS_MAX 73 default 24 if 64BIT # SV39 based 74 default 17 75 76# set if we run in machine mode, cleared if we run in supervisor mode 77config RISCV_M_MODE 78 bool 79 default !MMU 80 81# set if we are running in S-mode and can use SBI calls 82config RISCV_SBI 83 bool 84 depends on !RISCV_M_MODE 85 default y 86 87config MMU 88 bool "MMU-based Paged Memory Management Support" 89 default y 90 help 91 Select if you want MMU-based virtualised addressing space 92 support by paged memory management. If unsure, say 'Y'. 93 94config ZONE_DMA32 95 bool 96 default y if 64BIT 97 98config VA_BITS 99 int 100 default 32 if 32BIT 101 default 39 if 64BIT 102 103config PA_BITS 104 int 105 default 34 if 32BIT 106 default 56 if 64BIT 107 108config PAGE_OFFSET 109 hex 110 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB 111 default 0x80000000 if 64BIT && !MMU 112 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 113 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 114 115config ARCH_FLATMEM_ENABLE 116 def_bool y 117 118config ARCH_SPARSEMEM_ENABLE 119 def_bool y 120 select SPARSEMEM_VMEMMAP_ENABLE 121 122config ARCH_SELECT_MEMORY_MODEL 123 def_bool ARCH_SPARSEMEM_ENABLE 124 125config ARCH_WANT_GENERAL_HUGETLB 126 def_bool y 127 128config SYS_SUPPORTS_HUGETLBFS 129 def_bool y 130 131config STACKTRACE_SUPPORT 132 def_bool y 133 134config TRACE_IRQFLAGS_SUPPORT 135 def_bool y 136 137config GENERIC_BUG 138 def_bool y 139 depends on BUG 140 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 141 142config GENERIC_BUG_RELATIVE_POINTERS 143 bool 144 145config GENERIC_CALIBRATE_DELAY 146 def_bool y 147 148config GENERIC_CSUM 149 def_bool y 150 151config GENERIC_HWEIGHT 152 def_bool y 153 154config FIX_EARLYCON_MEM 155 def_bool CONFIG_MMU 156 157config PGTABLE_LEVELS 158 int 159 default 3 if 64BIT 160 default 2 161 162source "arch/riscv/Kconfig.socs" 163 164menu "Platform type" 165 166choice 167 prompt "Base ISA" 168 default ARCH_RV64I 169 help 170 This selects the base ISA that this kernel will target and must match 171 the target platform. 172 173config ARCH_RV32I 174 bool "RV32I" 175 select 32BIT 176 select GENERIC_LIB_ASHLDI3 177 select GENERIC_LIB_ASHRDI3 178 select GENERIC_LIB_LSHRDI3 179 select GENERIC_LIB_UCMPDI2 180 select MMU 181 182config ARCH_RV64I 183 bool "RV64I" 184 select 64BIT 185 select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 186 select HAVE_FUNCTION_TRACER 187 select HAVE_FUNCTION_GRAPH_TRACER 188 select HAVE_FTRACE_MCOUNT_RECORD 189 select HAVE_DYNAMIC_FTRACE if MMU 190 select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE 191 select SWIOTLB if MMU 192 193endchoice 194 195# We must be able to map all physical memory into the kernel, but the compiler 196# is still a bit more efficient when generating code if it's setup in a manner 197# such that it can only map 2GiB of memory. 198choice 199 prompt "Kernel Code Model" 200 default CMODEL_MEDLOW if 32BIT 201 default CMODEL_MEDANY if 64BIT 202 203 config CMODEL_MEDLOW 204 bool "medium low code model" 205 config CMODEL_MEDANY 206 bool "medium any code model" 207endchoice 208 209config MODULE_SECTIONS 210 bool 211 select HAVE_MOD_ARCH_SPECIFIC 212 213choice 214 prompt "Maximum Physical Memory" 215 default MAXPHYSMEM_2GB if 32BIT 216 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 217 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 218 219 config MAXPHYSMEM_2GB 220 bool "2GiB" 221 config MAXPHYSMEM_128GB 222 depends on 64BIT && CMODEL_MEDANY 223 bool "128GiB" 224endchoice 225 226 227config SMP 228 bool "Symmetric Multi-Processing" 229 help 230 This enables support for systems with more than one CPU. If 231 you say N here, the kernel will run on single and 232 multiprocessor machines, but will use only one CPU of a 233 multiprocessor machine. If you say Y here, the kernel will run 234 on many, but not all, single processor machines. On a single 235 processor machine, the kernel will run faster if you say N 236 here. 237 238 If you don't know what to do here, say N. 239 240config NR_CPUS 241 int "Maximum number of CPUs (2-32)" 242 range 2 32 243 depends on SMP 244 default "8" 245 246choice 247 prompt "CPU Tuning" 248 default TUNE_GENERIC 249 250config TUNE_GENERIC 251 bool "generic" 252 253endchoice 254 255config RISCV_ISA_C 256 bool "Emit compressed instructions when building Linux" 257 default y 258 help 259 Adds "C" to the ISA subsets that the toolchain is allowed to emit 260 when building Linux, which results in compressed instructions in the 261 Linux binary. 262 263 If you don't know what to do here, say Y. 264 265menu "supported PMU type" 266 depends on PERF_EVENTS 267 268config RISCV_BASE_PMU 269 bool "Base Performance Monitoring Unit" 270 def_bool y 271 help 272 A base PMU that serves as a reference implementation and has limited 273 feature of perf. It can run on any RISC-V machines so serves as the 274 fallback, but this option can also be disable to reduce kernel size. 275 276endmenu 277 278config FPU 279 bool "FPU support" 280 default y 281 help 282 Say N here if you want to disable all floating-point related procedure 283 in the kernel. 284 285 If you don't know what to do here, say Y. 286 287endmenu 288 289menu "Kernel features" 290 291source "kernel/Kconfig.hz" 292 293endmenu 294 295menu "Boot options" 296 297config CMDLINE 298 string "Built-in kernel command line" 299 help 300 For most platforms, the arguments for the kernel's command line 301 are provided at run-time, during boot. However, there are cases 302 where either no arguments are being provided or the provided 303 arguments are insufficient or even invalid. 304 305 When that occurs, it is possible to define a built-in command 306 line here and choose how the kernel should use it later on. 307 308choice 309 prompt "Built-in command line usage" if CMDLINE != "" 310 default CMDLINE_FALLBACK 311 help 312 Choose how the kernel will handle the provided built-in command 313 line. 314 315config CMDLINE_FALLBACK 316 bool "Use bootloader kernel arguments if available" 317 help 318 Use the built-in command line as fallback in case we get nothing 319 during boot. This is the default behaviour. 320 321config CMDLINE_EXTEND 322 bool "Extend bootloader kernel arguments" 323 help 324 The command-line arguments provided during boot will be 325 appended to the built-in command line. This is useful in 326 cases where the provided arguments are insufficient and 327 you don't want to or cannot modify them. 328 329 330config CMDLINE_FORCE 331 bool "Always use the default kernel command string" 332 help 333 Always use the built-in command line, even if we get one during 334 boot. This is useful in case you need to override the provided 335 command line on systems where you don't have or want control 336 over it. 337 338endchoice 339 340endmenu 341 342menu "Power management options" 343 344source "kernel/power/Kconfig" 345 346endmenu 347