2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
14 # even on 32-bit, physical (and DMA) addresses are > 32-bits
15 select PHYS_ADDR_T_64BIT
17 select OF_EARLY_FLATTREE
19 select ARCH_WANT_FRAME_POINTERS
20 select CLONE_BACKWARDS
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
32 select HAVE_MEMBLOCK_NODE_MAP
33 select HAVE_DMA_CONTIGUOUS
34 select HAVE_GENERIC_DMA_COHERENT
35 select HAVE_PERF_EVENTS
38 select RISCV_ISA_A if SMP
40 select SYSCTL_EXCEPTION_TRACE
41 select HAVE_ARCH_TRACEHOOK
42 select MODULES_USE_ELF_RELA if MODULES
43 select THREAD_INFO_IN_TASK
45 select GENERIC_IRQ_MULTI_HANDLER
46 select ARCH_HAS_PTE_SPECIAL
57 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
58 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
59 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
61 config STACKTRACE_SUPPORT
64 config TRACE_IRQFLAGS_SUPPORT
67 config RWSEM_GENERIC_SPINLOCK
73 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
75 config GENERIC_BUG_RELATIVE_POINTERS
78 config GENERIC_CALIBRATE_DELAY
84 config GENERIC_HWEIGHT
101 This selects the base ISA that this kernel will traget and must match
107 select GENERIC_LIB_ASHLDI3
108 select GENERIC_LIB_ASHRDI3
109 select GENERIC_LIB_LSHRDI3
114 select HAVE_FUNCTION_TRACER
115 select HAVE_FUNCTION_GRAPH_TRACER
116 select HAVE_FTRACE_MCOUNT_RECORD
117 select HAVE_DYNAMIC_FTRACE
118 select HAVE_DYNAMIC_FTRACE_WITH_REGS
123 # We must be able to map all physical memory into the kernel, but the compiler
124 # is still a bit more efficient when generating code if it's setup in a manner
125 # such that it can only map 2GiB of memory.
127 prompt "Kernel Code Model"
128 default CMODEL_MEDLOW if 32BIT
129 default CMODEL_MEDANY if 64BIT
132 bool "medium low code model"
134 bool "medium any code model"
137 config MODULE_SECTIONS
139 select HAVE_MOD_ARCH_SPECIFIC
142 prompt "Maximum Physical Memory"
143 default MAXPHYSMEM_2GB if 32BIT
144 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
145 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
147 config MAXPHYSMEM_2GB
149 config MAXPHYSMEM_128GB
150 depends on 64BIT && CMODEL_MEDANY
151 select MODULE_SECTIONS if MODULES
157 bool "Symmetric Multi-Processing"
159 This enables support for systems with more than one CPU. If
160 you say N here, the kernel will run on single and
161 multiprocessor machines, but will use only one CPU of a
162 multiprocessor machine. If you say Y here, the kernel will run
163 on many, but not all, single processor machines. On a single
164 processor machine, the kernel will run faster if you say N
167 If you don't know what to do here, say N.
170 int "Maximum number of CPUs (2-32)"
185 bool "Emit compressed instructions when building Linux"
188 Adds "C" to the ISA subsets that the toolchain is allowed to emit
189 when building Linux, which results in compressed instructions in the
192 If you don't know what to do here, say Y.
197 menu "supported PMU type"
198 depends on PERF_EVENTS
200 config RISCV_BASE_PMU
201 bool "Base Performance Monitoring Unit"
204 A base PMU that serves as a reference implementation and has limited
205 feature of perf. It can run on any RISC-V machines so serves as the
206 fallback, but this option can also be disable to reduce kernel size.
216 source "kernel/Kconfig.preempt"
218 source "kernel/Kconfig.hz"
228 This feature enables support for PCI bus system. If you say Y
229 here, the kernel will include drivers and infrastructure code
230 to support PCI bus devices.
232 If you don't know what to do here, say Y.
237 config PCI_DOMAINS_GENERIC
240 source "drivers/pci/Kconfig"
244 source "init/Kconfig"
246 source "kernel/Kconfig.freezer"
248 menu "Executable file formats"
250 source "fs/Kconfig.binfmt"
254 menu "Power management options"
256 source kernel/power/Kconfig
262 source "drivers/Kconfig"
266 menu "Kernel hacking"
269 bool "Built-in kernel command line"
271 For most platforms, it is firmware or second stage bootloader
272 that by default specifies the kernel command line options.
273 However, it might be necessary or advantageous to either override
274 the default kernel command line or add a few extra options to it.
275 For such cases, this option allows hardcoding command line options
276 directly into the kernel.
278 For that, choose 'Y' here and fill in the extra boot parameters
281 The built-in options will be concatenated to the default command
282 line if CMDLINE_FORCE is set to 'N'. Otherwise, the default
283 command line will be ignored and replaced by the built-in string.
286 string "Built-in kernel command string"
287 depends on CMDLINE_BOOL
290 Supply command-line options at build time by entering them here.
293 bool "Built-in command line overrides bootloader arguments"
294 depends on CMDLINE_BOOL
296 Set this option to 'Y' to have the kernel ignore the bootloader
297 or firmware command line. Instead, the built-in command line
298 will be used exclusively.
300 If you don't know what to do here, say N.
305 source "lib/Kconfig.debug"
311 source "security/Kconfig"
313 source "crypto/Kconfig"