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 30 select GENERIC_STRNLEN_USER 31 select GENERIC_SMP_IDLE_THREAD 32 select GENERIC_ATOMIC64 if !64BIT 33 select HAVE_ARCH_AUDITSYSCALL 34 select HAVE_MEMBLOCK_NODE_MAP 35 select HAVE_DMA_CONTIGUOUS 36 select HAVE_FUTEX_CMPXCHG if FUTEX 37 select HAVE_PERF_EVENTS 38 select HAVE_SYSCALL_TRACEPOINTS 39 select IRQ_DOMAIN 40 select SPARSE_IRQ 41 select SYSCTL_EXCEPTION_TRACE 42 select HAVE_ARCH_TRACEHOOK 43 select HAVE_PCI 44 select MODULES_USE_ELF_RELA if MODULES 45 select MODULE_SECTIONS if MODULES 46 select THREAD_INFO_IN_TASK 47 select PCI_DOMAINS_GENERIC if PCI 48 select PCI_MSI if PCI 49 select RISCV_TIMER 50 select GENERIC_IRQ_MULTI_HANDLER 51 select ARCH_HAS_PTE_SPECIAL 52 select ARCH_HAS_MMIOWB 53 select HAVE_EBPF_JIT if 64BIT 54 select EDAC_SUPPORT 55 select ARCH_HAS_GIGANTIC_PAGE 56 select ARCH_WANT_HUGE_PMD_SHARE if 64BIT 57 58config MMU 59 def_bool y 60 61config ZONE_DMA32 62 bool 63 default y if 64BIT 64 65config PAGE_OFFSET 66 hex 67 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB 68 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 69 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 70 71config ARCH_WANT_GENERAL_HUGETLB 72 def_bool y 73 74config SYS_SUPPORTS_HUGETLBFS 75 def_bool y 76 77config STACKTRACE_SUPPORT 78 def_bool y 79 80config TRACE_IRQFLAGS_SUPPORT 81 def_bool y 82 83config GENERIC_BUG 84 def_bool y 85 depends on BUG 86 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 87 88config GENERIC_BUG_RELATIVE_POINTERS 89 bool 90 91config GENERIC_CALIBRATE_DELAY 92 def_bool y 93 94config GENERIC_CSUM 95 def_bool y 96 97config GENERIC_HWEIGHT 98 def_bool y 99 100config FIX_EARLYCON_MEM 101 def_bool y 102 103config PGTABLE_LEVELS 104 int 105 default 3 if 64BIT 106 default 2 107 108source "arch/riscv/Kconfig.socs" 109 110menu "Platform type" 111 112choice 113 prompt "Base ISA" 114 default ARCH_RV64I 115 help 116 This selects the base ISA that this kernel will target and must match 117 the target platform. 118 119config ARCH_RV32I 120 bool "RV32I" 121 select 32BIT 122 select GENERIC_LIB_ASHLDI3 123 select GENERIC_LIB_ASHRDI3 124 select GENERIC_LIB_LSHRDI3 125 select GENERIC_LIB_UCMPDI2 126 127config ARCH_RV64I 128 bool "RV64I" 129 select 64BIT 130 select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 131 select HAVE_FUNCTION_TRACER 132 select HAVE_FUNCTION_GRAPH_TRACER 133 select HAVE_FTRACE_MCOUNT_RECORD 134 select HAVE_DYNAMIC_FTRACE 135 select HAVE_DYNAMIC_FTRACE_WITH_REGS 136 select SWIOTLB 137 138endchoice 139 140# We must be able to map all physical memory into the kernel, but the compiler 141# is still a bit more efficient when generating code if it's setup in a manner 142# such that it can only map 2GiB of memory. 143choice 144 prompt "Kernel Code Model" 145 default CMODEL_MEDLOW if 32BIT 146 default CMODEL_MEDANY if 64BIT 147 148 config CMODEL_MEDLOW 149 bool "medium low code model" 150 config CMODEL_MEDANY 151 bool "medium any code model" 152endchoice 153 154config MODULE_SECTIONS 155 bool 156 select HAVE_MOD_ARCH_SPECIFIC 157 158choice 159 prompt "Maximum Physical Memory" 160 default MAXPHYSMEM_2GB if 32BIT 161 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 162 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 163 164 config MAXPHYSMEM_2GB 165 bool "2GiB" 166 config MAXPHYSMEM_128GB 167 depends on 64BIT && CMODEL_MEDANY 168 bool "128GiB" 169endchoice 170 171 172config SMP 173 bool "Symmetric Multi-Processing" 174 help 175 This enables support for systems with more than one CPU. If 176 you say N here, the kernel will run on single and 177 multiprocessor machines, but will use only one CPU of a 178 multiprocessor machine. If you say Y here, the kernel will run 179 on many, but not all, single processor machines. On a single 180 processor machine, the kernel will run faster if you say N 181 here. 182 183 If you don't know what to do here, say N. 184 185config NR_CPUS 186 int "Maximum number of CPUs (2-32)" 187 range 2 32 188 depends on SMP 189 default "8" 190 191choice 192 prompt "CPU Tuning" 193 default TUNE_GENERIC 194 195config TUNE_GENERIC 196 bool "generic" 197 198endchoice 199 200config RISCV_ISA_C 201 bool "Emit compressed instructions when building Linux" 202 default y 203 help 204 Adds "C" to the ISA subsets that the toolchain is allowed to emit 205 when building Linux, which results in compressed instructions in the 206 Linux binary. 207 208 If you don't know what to do here, say Y. 209 210menu "supported PMU type" 211 depends on PERF_EVENTS 212 213config RISCV_BASE_PMU 214 bool "Base Performance Monitoring Unit" 215 def_bool y 216 help 217 A base PMU that serves as a reference implementation and has limited 218 feature of perf. It can run on any RISC-V machines so serves as the 219 fallback, but this option can also be disable to reduce kernel size. 220 221endmenu 222 223config FPU 224 bool "FPU support" 225 default y 226 help 227 Say N here if you want to disable all floating-point related procedure 228 in the kernel. 229 230 If you don't know what to do here, say Y. 231 232endmenu 233 234menu "Kernel features" 235 236source "kernel/Kconfig.hz" 237 238endmenu 239 240menu "Boot options" 241 242config CMDLINE 243 string "Built-in kernel command line" 244 help 245 For most platforms, the arguments for the kernel's command line 246 are provided at run-time, during boot. However, there are cases 247 where either no arguments are being provided or the provided 248 arguments are insufficient or even invalid. 249 250 When that occurs, it is possible to define a built-in command 251 line here and choose how the kernel should use it later on. 252 253choice 254 prompt "Built-in command line usage" if CMDLINE != "" 255 default CMDLINE_FALLBACK 256 help 257 Choose how the kernel will handle the provided built-in command 258 line. 259 260config CMDLINE_FALLBACK 261 bool "Use bootloader kernel arguments if available" 262 help 263 Use the built-in command line as fallback in case we get nothing 264 during boot. This is the default behaviour. 265 266config CMDLINE_EXTEND 267 bool "Extend bootloader kernel arguments" 268 help 269 The command-line arguments provided during boot will be 270 appended to the built-in command line. This is useful in 271 cases where the provided arguments are insufficient and 272 you don't want to or cannot modify them. 273 274 275config CMDLINE_FORCE 276 bool "Always use the default kernel command string" 277 help 278 Always use the built-in command line, even if we get one during 279 boot. This is useful in case you need to override the provided 280 command line on systems where you don't have or want control 281 over it. 282 283endchoice 284 285endmenu 286 287menu "Power management options" 288 289source "kernel/power/Kconfig" 290 291endmenu 292