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 select GENERIC_LIB_UMODDI3 111 112config ARCH_RV64I 113 bool "RV64I" 114 select 64BIT 115 select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 116 select HAVE_FUNCTION_TRACER 117 select HAVE_FUNCTION_GRAPH_TRACER 118 select HAVE_FTRACE_MCOUNT_RECORD 119 select HAVE_DYNAMIC_FTRACE 120 select HAVE_DYNAMIC_FTRACE_WITH_REGS 121 select SWIOTLB 122 123endchoice 124 125# We must be able to map all physical memory into the kernel, but the compiler 126# is still a bit more efficient when generating code if it's setup in a manner 127# such that it can only map 2GiB of memory. 128choice 129 prompt "Kernel Code Model" 130 default CMODEL_MEDLOW if 32BIT 131 default CMODEL_MEDANY if 64BIT 132 133 config CMODEL_MEDLOW 134 bool "medium low code model" 135 config CMODEL_MEDANY 136 bool "medium any code model" 137endchoice 138 139config MODULE_SECTIONS 140 bool 141 select HAVE_MOD_ARCH_SPECIFIC 142 143choice 144 prompt "Maximum Physical Memory" 145 default MAXPHYSMEM_2GB if 32BIT 146 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW 147 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY 148 149 config MAXPHYSMEM_2GB 150 bool "2GiB" 151 config MAXPHYSMEM_128GB 152 depends on 64BIT && CMODEL_MEDANY 153 select MODULE_SECTIONS if MODULES 154 bool "128GiB" 155endchoice 156 157 158config SMP 159 bool "Symmetric Multi-Processing" 160 help 161 This enables support for systems with more than one CPU. If 162 you say N here, the kernel will run on single and 163 multiprocessor machines, but will use only one CPU of a 164 multiprocessor machine. If you say Y here, the kernel will run 165 on many, but not all, single processor machines. On a single 166 processor machine, the kernel will run faster if you say N 167 here. 168 169 If you don't know what to do here, say N. 170 171config NR_CPUS 172 int "Maximum number of CPUs (2-32)" 173 range 2 32 174 depends on SMP 175 default "8" 176 177choice 178 prompt "CPU Tuning" 179 default TUNE_GENERIC 180 181config TUNE_GENERIC 182 bool "generic" 183 184endchoice 185 186config RISCV_ISA_C 187 bool "Emit compressed instructions when building Linux" 188 default y 189 help 190 Adds "C" to the ISA subsets that the toolchain is allowed to emit 191 when building Linux, which results in compressed instructions in the 192 Linux binary. 193 194 If you don't know what to do here, say Y. 195 196config RISCV_ISA_A 197 def_bool y 198 199menu "supported PMU type" 200 depends on PERF_EVENTS 201 202config RISCV_BASE_PMU 203 bool "Base Performance Monitoring Unit" 204 def_bool y 205 help 206 A base PMU that serves as a reference implementation and has limited 207 feature of perf. It can run on any RISC-V machines so serves as the 208 fallback, but this option can also be disable to reduce kernel size. 209 210endmenu 211 212config FPU 213 bool "FPU support" 214 default y 215 help 216 Say N here if you want to disable all floating-point related procedure 217 in the kernel. 218 219 If you don't know what to do here, say Y. 220 221endmenu 222 223menu "Kernel features" 224 225source "kernel/Kconfig.hz" 226 227endmenu 228 229menu "Boot options" 230 231config CMDLINE_BOOL 232 bool "Built-in kernel command line" 233 help 234 For most platforms, it is firmware or second stage bootloader 235 that by default specifies the kernel command line options. 236 However, it might be necessary or advantageous to either override 237 the default kernel command line or add a few extra options to it. 238 For such cases, this option allows hardcoding command line options 239 directly into the kernel. 240 241 For that, choose 'Y' here and fill in the extra boot parameters 242 in CONFIG_CMDLINE. 243 244 The built-in options will be concatenated to the default command 245 line if CMDLINE_FORCE is set to 'N'. Otherwise, the default 246 command line will be ignored and replaced by the built-in string. 247 248config CMDLINE 249 string "Built-in kernel command string" 250 depends on CMDLINE_BOOL 251 default "" 252 help 253 Supply command-line options at build time by entering them here. 254 255config CMDLINE_FORCE 256 bool "Built-in command line overrides bootloader arguments" 257 depends on CMDLINE_BOOL 258 help 259 Set this option to 'Y' to have the kernel ignore the bootloader 260 or firmware command line. Instead, the built-in command line 261 will be used exclusively. 262 263 If you don't know what to do here, say N. 264 265endmenu 266 267menu "Bus support" 268 269config PCI 270 bool "PCI support" 271 select PCI_MSI 272 help 273 This feature enables support for PCI bus system. If you say Y 274 here, the kernel will include drivers and infrastructure code 275 to support PCI bus devices. 276 277 If you don't know what to do here, say Y. 278 279config PCI_DOMAINS 280 def_bool PCI 281 282config PCI_DOMAINS_GENERIC 283 def_bool PCI 284 285source "drivers/pci/Kconfig" 286 287endmenu 288 289menu "Power management options" 290 291source kernel/power/Kconfig 292 293endmenu 294