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 DMA_DIRECT_OPS 23 select GENERIC_CLOCKEVENTS 24 select GENERIC_CPU_DEVICES 25 select GENERIC_IRQ_SHOW 26 select GENERIC_PCI_IOMAP 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_MEMBLOCK_NODE_MAP 32 select HAVE_DMA_CONTIGUOUS 33 select HAVE_FUTEX_CMPXCHG if FUTEX 34 select HAVE_GENERIC_DMA_COHERENT 35 select HAVE_PERF_EVENTS 36 select IRQ_DOMAIN 37 select RISCV_ISA_A if SMP 38 select SPARSE_IRQ 39 select SYSCTL_EXCEPTION_TRACE 40 select HAVE_ARCH_TRACEHOOK 41 select MODULES_USE_ELF_RELA if MODULES 42 select THREAD_INFO_IN_TASK 43 select RISCV_TIMER 44 select GENERIC_IRQ_MULTI_HANDLER 45 select ARCH_HAS_PTE_SPECIAL 46 47config MMU 48 def_bool y 49 50config ZONE_DMA32 51 bool 52 default y if 64BIT 53 54config PAGE_OFFSET 55 hex 56 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB 57 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 58 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 59 60config STACKTRACE_SUPPORT 61 def_bool y 62 63config TRACE_IRQFLAGS_SUPPORT 64 def_bool y 65 66config RWSEM_GENERIC_SPINLOCK 67 def_bool y 68 69config GENERIC_BUG 70 def_bool y 71 depends on BUG 72 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 73 74config GENERIC_BUG_RELATIVE_POINTERS 75 bool 76 77config GENERIC_CALIBRATE_DELAY 78 def_bool y 79 80config GENERIC_CSUM 81 def_bool y 82 83config GENERIC_HWEIGHT 84 def_bool y 85 86config PGTABLE_LEVELS 87 int 88 default 3 if 64BIT 89 default 2 90 91config HAVE_KPROBES 92 def_bool n 93 94menu "Platform type" 95 96choice 97 prompt "Base ISA" 98 default ARCH_RV64I 99 help 100 This selects the base ISA that this kernel will traget and must match 101 the target platform. 102 103config ARCH_RV32I 104 bool "RV32I" 105 select 32BIT 106 select GENERIC_LIB_ASHLDI3 107 select GENERIC_LIB_ASHRDI3 108 select GENERIC_LIB_LSHRDI3 109 select GENERIC_LIB_UCMPDI2 110 111config ARCH_RV64I 112 bool "RV64I" 113 select 64BIT 114 select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 115 select HAVE_FUNCTION_TRACER 116 select HAVE_FUNCTION_GRAPH_TRACER 117 select HAVE_FTRACE_MCOUNT_RECORD 118 select HAVE_DYNAMIC_FTRACE 119 select HAVE_DYNAMIC_FTRACE_WITH_REGS 120 select SWIOTLB 121 122endchoice 123 124# We must be able to map all physical memory into the kernel, but the compiler 125# is still a bit more efficient when generating code if it's setup in a manner 126# such that it can only map 2GiB of memory. 127choice 128 prompt "Kernel Code Model" 129 default CMODEL_MEDLOW if 32BIT 130 default CMODEL_MEDANY if 64BIT 131 132 config CMODEL_MEDLOW 133 bool "medium low code model" 134 config CMODEL_MEDANY 135 bool "medium any code model" 136endchoice 137 138config MODULE_SECTIONS 139 bool 140 select HAVE_MOD_ARCH_SPECIFIC 141 142choice 143 prompt "Maximum Physical Memory" 144 default MAXPHYSMEM_2GB if 32BIT 145 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 146 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 147 148 config MAXPHYSMEM_2GB 149 bool "2GiB" 150 config MAXPHYSMEM_128GB 151 depends on 64BIT && CMODEL_MEDANY 152 select MODULE_SECTIONS if MODULES 153 bool "128GiB" 154endchoice 155 156 157config SMP 158 bool "Symmetric Multi-Processing" 159 help 160 This enables support for systems with more than one CPU. If 161 you say N here, the kernel will run on single and 162 multiprocessor machines, but will use only one CPU of a 163 multiprocessor machine. If you say Y here, the kernel will run 164 on many, but not all, single processor machines. On a single 165 processor machine, the kernel will run faster if you say N 166 here. 167 168 If you don't know what to do here, say N. 169 170config NR_CPUS 171 int "Maximum number of CPUs (2-32)" 172 range 2 32 173 depends on SMP 174 default "8" 175 176choice 177 prompt "CPU Tuning" 178 default TUNE_GENERIC 179 180config TUNE_GENERIC 181 bool "generic" 182 183endchoice 184 185config RISCV_ISA_C 186 bool "Emit compressed instructions when building Linux" 187 default y 188 help 189 Adds "C" to the ISA subsets that the toolchain is allowed to emit 190 when building Linux, which results in compressed instructions in the 191 Linux binary. 192 193 If you don't know what to do here, say Y. 194 195config RISCV_ISA_A 196 def_bool y 197 198menu "supported PMU type" 199 depends on PERF_EVENTS 200 201config RISCV_BASE_PMU 202 bool "Base Performance Monitoring Unit" 203 def_bool y 204 help 205 A base PMU that serves as a reference implementation and has limited 206 feature of perf. It can run on any RISC-V machines so serves as the 207 fallback, but this option can also be disable to reduce kernel size. 208 209endmenu 210 211config FPU 212 bool "FPU support" 213 default y 214 help 215 Say N here if you want to disable all floating-point related procedure 216 in the kernel. 217 218 If you don't know what to do here, say Y. 219 220endmenu 221 222menu "Kernel features" 223 224source "kernel/Kconfig.hz" 225 226endmenu 227 228menu "Boot options" 229 230config CMDLINE_BOOL 231 bool "Built-in kernel command line" 232 help 233 For most platforms, it is firmware or second stage bootloader 234 that by default specifies the kernel command line options. 235 However, it might be necessary or advantageous to either override 236 the default kernel command line or add a few extra options to it. 237 For such cases, this option allows hardcoding command line options 238 directly into the kernel. 239 240 For that, choose 'Y' here and fill in the extra boot parameters 241 in CONFIG_CMDLINE. 242 243 The built-in options will be concatenated to the default command 244 line if CMDLINE_FORCE is set to 'N'. Otherwise, the default 245 command line will be ignored and replaced by the built-in string. 246 247config CMDLINE 248 string "Built-in kernel command string" 249 depends on CMDLINE_BOOL 250 default "" 251 help 252 Supply command-line options at build time by entering them here. 253 254config CMDLINE_FORCE 255 bool "Built-in command line overrides bootloader arguments" 256 depends on CMDLINE_BOOL 257 help 258 Set this option to 'Y' to have the kernel ignore the bootloader 259 or firmware command line. Instead, the built-in command line 260 will be used exclusively. 261 262 If you don't know what to do here, say N. 263 264endmenu 265 266menu "Bus support" 267 268config PCI 269 bool "PCI support" 270 select PCI_MSI 271 help 272 This feature enables support for PCI bus system. If you say Y 273 here, the kernel will include drivers and infrastructure code 274 to support PCI bus devices. 275 276 If you don't know what to do here, say Y. 277 278config PCI_DOMAINS 279 def_bool PCI 280 281config PCI_DOMAINS_GENERIC 282 def_bool PCI 283 284source "drivers/pci/Kconfig" 285 286endmenu 287 288menu "Power management options" 289 290source "kernel/power/Kconfig" 291 292endmenu 293