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
110 select GENERIC_LIB_UCMPDI2
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
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.
128 prompt "Kernel Code Model"
129 default CMODEL_MEDLOW if 32BIT
130 default CMODEL_MEDANY if 64BIT
133 bool "medium low code model"
135 bool "medium any code model"
138 config MODULE_SECTIONS
140 select HAVE_MOD_ARCH_SPECIFIC
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
148 config MAXPHYSMEM_2GB
150 config MAXPHYSMEM_128GB
151 depends on 64BIT && CMODEL_MEDANY
152 select MODULE_SECTIONS if MODULES
158 bool "Symmetric Multi-Processing"
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
168 If you don't know what to do here, say N.
171 int "Maximum number of CPUs (2-32)"
186 bool "Emit compressed instructions when building Linux"
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
193 If you don't know what to do here, say Y.
198 menu "supported PMU type"
199 depends on PERF_EVENTS
201 config RISCV_BASE_PMU
202 bool "Base Performance Monitoring Unit"
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.
217 source "kernel/Kconfig.preempt"
219 source "kernel/Kconfig.hz"
229 This feature enables support for PCI bus system. If you say Y
230 here, the kernel will include drivers and infrastructure code
231 to support PCI bus devices.
233 If you don't know what to do here, say Y.
238 config PCI_DOMAINS_GENERIC
241 source "drivers/pci/Kconfig"
245 source "init/Kconfig"
247 source "kernel/Kconfig.freezer"
249 menu "Executable file formats"
251 source "fs/Kconfig.binfmt"
255 menu "Power management options"
257 source kernel/power/Kconfig
263 source "drivers/Kconfig"
267 menu "Kernel hacking"
270 bool "Built-in kernel command line"
272 For most platforms, it is firmware or second stage bootloader
273 that by default specifies the kernel command line options.
274 However, it might be necessary or advantageous to either override
275 the default kernel command line or add a few extra options to it.
276 For such cases, this option allows hardcoding command line options
277 directly into the kernel.
279 For that, choose 'Y' here and fill in the extra boot parameters
282 The built-in options will be concatenated to the default command
283 line if CMDLINE_FORCE is set to 'N'. Otherwise, the default
284 command line will be ignored and replaced by the built-in string.
287 string "Built-in kernel command string"
288 depends on CMDLINE_BOOL
291 Supply command-line options at build time by entering them here.
294 bool "Built-in command line overrides bootloader arguments"
295 depends on CMDLINE_BOOL
297 Set this option to 'Y' to have the kernel ignore the bootloader
298 or firmware command line. Instead, the built-in command line
299 will be used exclusively.
301 If you don't know what to do here, say N.
306 source "lib/Kconfig.debug"
312 source "security/Kconfig"
314 source "crypto/Kconfig"