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 32 select HAVE_MEMBLOCK_NODE_MAP 33 select HAVE_DMA_CONTIGUOUS 34 select HAVE_GENERIC_DMA_COHERENT 35 select HAVE_PERF_EVENTS 36 select IRQ_DOMAIN 37 select NO_BOOTMEM 38 select RISCV_ISA_A if SMP 39 select SPARSE_IRQ 40 select SYSCTL_EXCEPTION_TRACE 41 select HAVE_ARCH_TRACEHOOK 42 select MODULES_USE_ELF_RELA if MODULES 43 select THREAD_INFO_IN_TASK 44 select RISCV_TIMER 45 select GENERIC_IRQ_MULTI_HANDLER 46 select ARCH_HAS_PTE_SPECIAL 47 48config MMU 49 def_bool y 50 51config ZONE_DMA32 52 bool 53 default y if 64BIT 54 55config PAGE_OFFSET 56 hex 57 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB 58 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 59 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 60 61config STACKTRACE_SUPPORT 62 def_bool y 63 64config TRACE_IRQFLAGS_SUPPORT 65 def_bool y 66 67config RWSEM_GENERIC_SPINLOCK 68 def_bool y 69 70config GENERIC_BUG 71 def_bool y 72 depends on BUG 73 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 74 75config GENERIC_BUG_RELATIVE_POINTERS 76 bool 77 78config GENERIC_CALIBRATE_DELAY 79 def_bool y 80 81config GENERIC_CSUM 82 def_bool y 83 84config GENERIC_HWEIGHT 85 def_bool y 86 87config PGTABLE_LEVELS 88 int 89 default 3 if 64BIT 90 default 2 91 92config HAVE_KPROBES 93 def_bool n 94 95menu "Platform type" 96 97choice 98 prompt "Base ISA" 99 default ARCH_RV64I 100 help 101 This selects the base ISA that this kernel will traget and must match 102 the target platform. 103 104config ARCH_RV32I 105 bool "RV32I" 106 select 32BIT 107 select GENERIC_LIB_ASHLDI3 108 select GENERIC_LIB_ASHRDI3 109 select GENERIC_LIB_LSHRDI3 110 select GENERIC_LIB_UCMPDI2 111 112config ARCH_RV64I 113 bool "RV64I" 114 select 64BIT 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 211endmenu 212 213menu "Kernel type" 214 215source "mm/Kconfig" 216 217source "kernel/Kconfig.preempt" 218 219source "kernel/Kconfig.hz" 220 221endmenu 222 223menu "Bus support" 224 225config PCI 226 bool "PCI support" 227 select PCI_MSI 228 help 229 This feature enables support for PCI bus system. If you say Y 230 here, the kernel will include drivers and infrastructure code 231 to support PCI bus devices. 232 233 If you don't know what to do here, say Y. 234 235config PCI_DOMAINS 236 def_bool PCI 237 238config PCI_DOMAINS_GENERIC 239 def_bool PCI 240 241source "drivers/pci/Kconfig" 242 243endmenu 244 245source "init/Kconfig" 246 247source "kernel/Kconfig.freezer" 248 249menu "Executable file formats" 250 251source "fs/Kconfig.binfmt" 252 253endmenu 254 255menu "Power management options" 256 257source kernel/power/Kconfig 258 259endmenu 260 261source "net/Kconfig" 262 263source "drivers/Kconfig" 264 265source "fs/Kconfig" 266 267menu "Kernel hacking" 268 269config CMDLINE_BOOL 270 bool "Built-in kernel command line" 271 help 272 For most platforms, it is firmware or second stage bootloader 273 that by default specifies the kernel command line options. 274 However, it might be necessary or advantageous to either override 275 the default kernel command line or add a few extra options to it. 276 For such cases, this option allows hardcoding command line options 277 directly into the kernel. 278 279 For that, choose 'Y' here and fill in the extra boot parameters 280 in CONFIG_CMDLINE. 281 282 The built-in options will be concatenated to the default command 283 line if CMDLINE_FORCE is set to 'N'. Otherwise, the default 284 command line will be ignored and replaced by the built-in string. 285 286config CMDLINE 287 string "Built-in kernel command string" 288 depends on CMDLINE_BOOL 289 default "" 290 help 291 Supply command-line options at build time by entering them here. 292 293config CMDLINE_FORCE 294 bool "Built-in command line overrides bootloader arguments" 295 depends on CMDLINE_BOOL 296 help 297 Set this option to 'Y' to have the kernel ignore the bootloader 298 or firmware command line. Instead, the built-in command line 299 will be used exclusively. 300 301 If you don't know what to do here, say N. 302 303config EARLY_PRINTK 304 def_bool y 305 306source "lib/Kconfig.debug" 307 308config CMDLINE_BOOL 309 bool 310endmenu 311 312source "security/Kconfig" 313 314source "crypto/Kconfig" 315 316source "lib/Kconfig" 317