arch/riscv/Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see Documentation/kbuild/kconfig-language.txt.
   4 #
   5
   6 config 64BIT
   7         bool
   8
   9 config 32BIT
  10         bool
  11
  12 config 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
  49 config MMU
  50         def_bool y
  51
  52 config ZONE_DMA32
  53         bool
  54         default y if 64BIT
  55
  56 config 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
  62 config STACKTRACE_SUPPORT
  63         def_bool y
  64
  65 config TRACE_IRQFLAGS_SUPPORT
  66         def_bool y
  67
  68 config RWSEM_GENERIC_SPINLOCK
  69         def_bool y
  70
  71 config GENERIC_BUG
  72         def_bool y
  73         depends on BUG
  74         select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
  75
  76 config GENERIC_BUG_RELATIVE_POINTERS
  77         bool
  78
  79 config GENERIC_CALIBRATE_DELAY
  80         def_bool y
  81
  82 config GENERIC_CSUM
  83         def_bool y
  84
  85 config GENERIC_HWEIGHT
  86         def_bool y
  87
  88 config PGTABLE_LEVELS
  89         int
  90         default 3 if 64BIT
  91         default 2
  92
  93 config HAVE_KPROBES
  94         def_bool n
  95
  96 menu "Platform type"
  97
  98 choice
  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
 105 config 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
 114 config 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
 125 endchoice
 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.
 130 choice
 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"
 139 endchoice
 140
 141 config MODULE_SECTIONS
 142         bool
 143         select HAVE_MOD_ARCH_SPECIFIC
 144
 145 choice
 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"
 157 endchoice
 158
 159
 160 config 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
 173 config NR_CPUS
 174         int "Maximum number of CPUs (2-32)"
 175         range 2 32
 176         depends on SMP
 177         default "8"
 178
 179 choice
 180         prompt "CPU Tuning"
 181         default TUNE_GENERIC
 182
 183 config TUNE_GENERIC
 184         bool "generic"
 185
 186 endchoice
 187
 188 config 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
 198 config RISCV_ISA_A
 199         def_bool y
 200
 201 menu "supported PMU type"
 202         depends on PERF_EVENTS
 203
 204 config 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
 212 endmenu
 213
 214 config 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
 223 endmenu
 224
 225 menu "Kernel features"
 226
 227 source "kernel/Kconfig.hz"
 228
 229 endmenu
 230
 231 menu "Boot options"
 232
 233 config 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
 250 config 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
 257 config 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
 267 endmenu
 268
 269 menu "Bus support"
 270
 271 config 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
 281 config PCI_DOMAINS
 282         def_bool PCI
 283
 284 config PCI_DOMAINS_GENERIC
 285         def_bool PCI
 286
 287 source "drivers/pci/Kconfig"
 288
 289 endmenu
 290
 291 menu "Power management options"
 292
 293 source kernel/power/Kconfig
 294
 295 endmenu