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