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_FUTEX_CMPXCHG if FUTEX 35 select HAVE_GENERIC_DMA_COHERENT 36 select HAVE_PERF_EVENTS 37 select IRQ_DOMAIN 38 select NO_BOOTMEM 39 select RISCV_ISA_A if SMP 40 select SPARSE_IRQ 41 select SYSCTL_EXCEPTION_TRACE 42 select HAVE_ARCH_TRACEHOOK 43 select MODULES_USE_ELF_RELA if MODULES 44 select THREAD_INFO_IN_TASK 45 select RISCV_TIMER 46 select GENERIC_IRQ_MULTI_HANDLER 47 select ARCH_HAS_PTE_SPECIAL 48 49config MMU 50 def_bool y 51 52config ZONE_DMA32 53 bool 54 default y if 64BIT 55 56config PAGE_OFFSET 57 hex 58 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB 59 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB 60 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB 61 62config STACKTRACE_SUPPORT 63 def_bool y 64 65config TRACE_IRQFLAGS_SUPPORT 66 def_bool y 67 68config RWSEM_GENERIC_SPINLOCK 69 def_bool y 70 71config GENERIC_BUG 72 def_bool y 73 depends on BUG 74 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT 75 76config GENERIC_BUG_RELATIVE_POINTERS 77 bool 78 79config GENERIC_CALIBRATE_DELAY 80 def_bool y 81 82config GENERIC_CSUM 83 def_bool y 84 85config GENERIC_HWEIGHT 86 def_bool y 87 88config PGTABLE_LEVELS 89 int 90 default 3 if 64BIT 91 default 2 92 93config HAVE_KPROBES 94 def_bool n 95 96menu "Platform type" 97 98choice 99 prompt "Base ISA" 100 default ARCH_RV64I 101 help 102 This selects the base ISA that this kernel will traget and must match 103 the target platform. 104 105config ARCH_RV32I 106 bool "RV32I" 107 select 32BIT 108 select GENERIC_LIB_ASHLDI3 109 select GENERIC_LIB_ASHRDI3 110 select GENERIC_LIB_LSHRDI3 111 select GENERIC_LIB_UCMPDI2 112 select GENERIC_LIB_UMODDI3 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_BOOL 234 bool "Built-in kernel command line" 235 help 236 For most platforms, it is firmware or second stage bootloader 237 that by default specifies the kernel command line options. 238 However, it might be necessary or advantageous to either override 239 the default kernel command line or add a few extra options to it. 240 For such cases, this option allows hardcoding command line options 241 directly into the kernel. 242 243 For that, choose 'Y' here and fill in the extra boot parameters 244 in CONFIG_CMDLINE. 245 246 The built-in options will be concatenated to the default command 247 line if CMDLINE_FORCE is set to 'N'. Otherwise, the default 248 command line will be ignored and replaced by the built-in string. 249 250config CMDLINE 251 string "Built-in kernel command string" 252 depends on CMDLINE_BOOL 253 default "" 254 help 255 Supply command-line options at build time by entering them here. 256 257config CMDLINE_FORCE 258 bool "Built-in command line overrides bootloader arguments" 259 depends on CMDLINE_BOOL 260 help 261 Set this option to 'Y' to have the kernel ignore the bootloader 262 or firmware command line. Instead, the built-in command line 263 will be used exclusively. 264 265 If you don't know what to do here, say N. 266 267endmenu 268 269menu "Bus support" 270 271config PCI 272 bool "PCI support" 273 select PCI_MSI 274 help 275 This feature enables support for PCI bus system. If you say Y 276 here, the kernel will include drivers and infrastructure code 277 to support PCI bus devices. 278 279 If you don't know what to do here, say Y. 280 281config PCI_DOMAINS 282 def_bool PCI 283 284config PCI_DOMAINS_GENERIC 285 def_bool PCI 286 287source "drivers/pci/Kconfig" 288 289endmenu 290 291menu "Power management options" 292 293source kernel/power/Kconfig 294 295endmenu 296