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