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_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
  48 config MMU
  49         def_bool y
  50
  51 config ZONE_DMA32
  52         bool
  53         default y if 64BIT
  54
  55 config 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
  61 config STACKTRACE_SUPPORT
  62         def_bool y
  63
  64 config TRACE_IRQFLAGS_SUPPORT
  65         def_bool y
  66
  67 config RWSEM_GENERIC_SPINLOCK
  68         def_bool y
  69
  70 config GENERIC_BUG
  71         def_bool y
  72         depends on BUG
  73         select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
  74
  75 config GENERIC_BUG_RELATIVE_POINTERS
  76         bool
  77
  78 config GENERIC_CALIBRATE_DELAY
  79         def_bool y
  80
  81 config GENERIC_CSUM
  82         def_bool y
  83
  84 config GENERIC_HWEIGHT
  85         def_bool y
  86
  87 config PGTABLE_LEVELS
  88         int
  89         default 3 if 64BIT
  90         default 2
  91
  92 config HAVE_KPROBES
  93         def_bool n
  94
  95 menu "Platform type"
  96
  97 choice
  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
 104 config 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
 112 config 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
 122 endchoice
 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.
 127 choice
 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"
 136 endchoice
 137
 138 config MODULE_SECTIONS
 139         bool
 140         select HAVE_MOD_ARCH_SPECIFIC
 141
 142 choice
 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"
 154 endchoice
 155
 156
 157 config 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
 170 config NR_CPUS
 171         int "Maximum number of CPUs (2-32)"
 172         range 2 32
 173         depends on SMP
 174         default "8"
 175
 176 choice
 177         prompt "CPU Tuning"
 178         default TUNE_GENERIC
 179
 180 config TUNE_GENERIC
 181         bool "generic"
 182
 183 endchoice
 184
 185 config 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
 195 config RISCV_ISA_A
 196         def_bool y
 197
 198 menu "supported PMU type"
 199         depends on PERF_EVENTS
 200
 201 config 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
 209 endmenu
 210
 211 endmenu
 212
 213 menu "Kernel type"
 214
 215 source "kernel/Kconfig.hz"
 216
 217 endmenu
 218
 219 menu "Bus support"
 220
 221 config PCI
 222         bool "PCI support"
 223         select PCI_MSI
 224         help
 225           This feature enables support for PCI bus system. If you say Y
 226           here, the kernel will include drivers and infrastructure code
 227           to support PCI bus devices.
 228
 229           If you don't know what to do here, say Y.
 230
 231 config PCI_DOMAINS
 232         def_bool PCI
 233
 234 config PCI_DOMAINS_GENERIC
 235         def_bool PCI
 236
 237 source "drivers/pci/Kconfig"
 238
 239 endmenu
 240
 241 menu "Power management options"
 242
 243 source kernel/power/Kconfig
 244
 245 endmenu