1# 2# For a description of the syntax of this configuration file, 3# see Documentation/kbuild/kconfig-language.txt. 4# 5 6config 64BIT 7 bool 8 9config 32BIT 10 bool 11 12config RISCV 13 def_bool y 14 # even on 32-bit, physical (and DMA) addresses are > 32-bits 15 select PHYS_ADDR_T_64BIT 16 select OF 17 select OF_EARLY_FLATTREE 18 select OF_IRQ 19 select ARCH_WANT_FRAME_POINTERS 20 select CLONE_BACKWARDS 21 select COMMON_CLK 22 select GENERIC_CLOCKEVENTS 23 select GENERIC_CPU_DEVICES 24 select GENERIC_IRQ_SHOW 25 select GENERIC_PCI_IOMAP 26 select GENERIC_SCHED_CLOCK 27 select GENERIC_STRNCPY_FROM_USER 28 select GENERIC_STRNLEN_USER 29 select GENERIC_SMP_IDLE_THREAD 30 select GENERIC_ATOMIC64 if !64BIT || !RISCV_ISA_A 31 select HAVE_ARCH_AUDITSYSCALL 32 select HAVE_MEMBLOCK_NODE_MAP 33 select HAVE_DMA_CONTIGUOUS 34 select HAVE_FUTEX_CMPXCHG if FUTEX 35 select HAVE_GENERIC_DMA_COHERENT 36 select HAVE_PERF_EVENTS 37 select HAVE_SYSCALL_TRACEPOINTS 38 select IRQ_DOMAIN 39 select RISCV_ISA_A if SMP 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 HAVE_EBPF_JIT if 64BIT 53 54config MMU 55 def_bool y 56 57config ZONE_DMA32 58 bool 59 default y if 64BIT 60 61config PAGE_OFFSET 62 hex 63 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB 64 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 65 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 66 67config STACKTRACE_SUPPORT 68 def_bool y 69 70config TRACE_IRQFLAGS_SUPPORT 71 def_bool y 72 73config RWSEM_GENERIC_SPINLOCK 74 def_bool y 75 76config GENERIC_BUG 77 def_bool y 78 depends on BUG 79 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 80 81config GENERIC_BUG_RELATIVE_POINTERS 82 bool 83 84config GENERIC_CALIBRATE_DELAY 85 def_bool y 86 87config GENERIC_CSUM 88 def_bool y 89 90config GENERIC_HWEIGHT 91 def_bool y 92 93config PGTABLE_LEVELS 94 int 95 default 3 if 64BIT 96 default 2 97 98config HAVE_KPROBES 99 def_bool n 100 101menu "Platform type" 102 103choice 104 prompt "Base ISA" 105 default ARCH_RV64I 106 help 107 This selects the base ISA that this kernel will target and must match 108 the target platform. 109 110config ARCH_RV32I 111 bool "RV32I" 112 select 32BIT 113 select GENERIC_LIB_ASHLDI3 114 select GENERIC_LIB_ASHRDI3 115 select GENERIC_LIB_LSHRDI3 116 select GENERIC_LIB_UCMPDI2 117 118config ARCH_RV64I 119 bool "RV64I" 120 select 64BIT 121 select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 122 select HAVE_FUNCTION_TRACER 123 select HAVE_FUNCTION_GRAPH_TRACER 124 select HAVE_FTRACE_MCOUNT_RECORD 125 select HAVE_DYNAMIC_FTRACE 126 select HAVE_DYNAMIC_FTRACE_WITH_REGS 127 select SWIOTLB 128 129endchoice 130 131# We must be able to map all physical memory into the kernel, but the compiler 132# is still a bit more efficient when generating code if it's setup in a manner 133# such that it can only map 2GiB of memory. 134choice 135 prompt "Kernel Code Model" 136 default CMODEL_MEDLOW if 32BIT 137 default CMODEL_MEDANY if 64BIT 138 139 config CMODEL_MEDLOW 140 bool "medium low code model" 141 config CMODEL_MEDANY 142 bool "medium any code model" 143endchoice 144 145config MODULE_SECTIONS 146 bool 147 select HAVE_MOD_ARCH_SPECIFIC 148 149choice 150 prompt "Maximum Physical Memory" 151 default MAXPHYSMEM_2GB if 32BIT 152 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 153 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 154 155 config MAXPHYSMEM_2GB 156 bool "2GiB" 157 config MAXPHYSMEM_128GB 158 depends on 64BIT && CMODEL_MEDANY 159 bool "128GiB" 160endchoice 161 162 163config SMP 164 bool "Symmetric Multi-Processing" 165 help 166 This enables support for systems with more than one CPU. If 167 you say N here, the kernel will run on single and 168 multiprocessor machines, but will use only one CPU of a 169 multiprocessor machine. If you say Y here, the kernel will run 170 on many, but not all, single processor machines. On a single 171 processor machine, the kernel will run faster if you say N 172 here. 173 174 If you don't know what to do here, say N. 175 176config NR_CPUS 177 int "Maximum number of CPUs (2-32)" 178 range 2 32 179 depends on SMP 180 default "8" 181 182choice 183 prompt "CPU Tuning" 184 default TUNE_GENERIC 185 186config TUNE_GENERIC 187 bool "generic" 188 189endchoice 190 191config RISCV_ISA_C 192 bool "Emit compressed instructions when building Linux" 193 default y 194 help 195 Adds "C" to the ISA subsets that the toolchain is allowed to emit 196 when building Linux, which results in compressed instructions in the 197 Linux binary. 198 199 If you don't know what to do here, say Y. 200 201config RISCV_ISA_A 202 def_bool y 203 204menu "supported PMU type" 205 depends on PERF_EVENTS 206 207config RISCV_BASE_PMU 208 bool "Base Performance Monitoring Unit" 209 def_bool y 210 help 211 A base PMU that serves as a reference implementation and has limited 212 feature of perf. It can run on any RISC-V machines so serves as the 213 fallback, but this option can also be disable to reduce kernel size. 214 215endmenu 216 217config FPU 218 bool "FPU support" 219 default y 220 help 221 Say N here if you want to disable all floating-point related procedure 222 in the kernel. 223 224 If you don't know what to do here, say Y. 225 226endmenu 227 228menu "Kernel features" 229 230source "kernel/Kconfig.hz" 231 232endmenu 233 234menu "Boot options" 235 236config CMDLINE 237 string "Built-in kernel command line" 238 help 239 For most platforms, the arguments for the kernel's command line 240 are provided at run-time, during boot. However, there are cases 241 where either no arguments are being provided or the provided 242 arguments are insufficient or even invalid. 243 244 When that occurs, it is possible to define a built-in command 245 line here and choose how the kernel should use it later on. 246 247choice 248 prompt "Built-in command line usage" if CMDLINE != "" 249 default CMDLINE_FALLBACK 250 help 251 Choose how the kernel will handle the provided built-in command 252 line. 253 254config CMDLINE_FALLBACK 255 bool "Use bootloader kernel arguments if available" 256 help 257 Use the built-in command line as fallback in case we get nothing 258 during boot. This is the default behaviour. 259 260config CMDLINE_EXTEND 261 bool "Extend bootloader kernel arguments" 262 help 263 The command-line arguments provided during boot will be 264 appended to the built-in command line. This is useful in 265 cases where the provided arguments are insufficient and 266 you don't want to or cannot modify them. 267 268 269config CMDLINE_FORCE 270 bool "Always use the default kernel command string" 271 help 272 Always use the built-in command line, even if we get one during 273 boot. This is useful in case you need to override the provided 274 command line on systems where you don't have or want control 275 over it. 276 277endchoice 278 279endmenu 280 281menu "Power management options" 282 283source "kernel/power/Kconfig" 284 285endmenu 286