2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
9 select OF_EARLY_FLATTREE
11 select ARCH_WANT_FRAME_POINTERS
12 select CLONE_BACKWARDS
14 select GENERIC_CLOCKEVENTS
15 select GENERIC_CPU_DEVICES
16 select GENERIC_IRQ_SHOW
17 select GENERIC_PCI_IOMAP
18 select GENERIC_STRNCPY_FROM_USER
19 select GENERIC_STRNLEN_USER
20 select GENERIC_SMP_IDLE_THREAD
21 select GENERIC_ATOMIC64 if !64BIT || !RISCV_ISA_A
23 select HAVE_MEMBLOCK_NODE_MAP
24 select HAVE_DMA_API_DEBUG
25 select HAVE_DMA_CONTIGUOUS
26 select HAVE_GENERIC_DMA_COHERENT
29 select RISCV_ISA_A if SMP
31 select SYSCTL_EXCEPTION_TRACE
32 select HAVE_ARCH_TRACEHOOK
33 select MODULES_USE_ELF_RELA if MODULES
34 select THREAD_INFO_IN_TASK
40 # even on 32-bit, physical (and DMA) addresses are > 32-bits
41 config ARCH_PHYS_ADDR_T_64BIT
48 config ARCH_DMA_ADDR_T_64BIT
53 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
54 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
55 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
57 config STACKTRACE_SUPPORT
60 config TRACE_IRQFLAGS_SUPPORT
63 config RWSEM_GENERIC_SPINLOCK
69 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
71 config GENERIC_BUG_RELATIVE_POINTERS
74 config GENERIC_CALIBRATE_DELAY
80 config GENERIC_HWEIGHT
100 This selects the base ISA that this kernel will traget and must match
105 select CPU_SUPPORTS_32BIT_KERNEL
107 select GENERIC_ASHLDI3
108 select GENERIC_ASHRDI3
109 select GENERIC_LSHRDI3
113 select CPU_SUPPORTS_64BIT_KERNEL
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
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"
138 prompt "Maximum Physical Memory"
139 default MAXPHYSMEM_2GB if 32BIT
140 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
141 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
143 config MAXPHYSMEM_2GB
145 config MAXPHYSMEM_128GB
146 depends on 64BIT && CMODEL_MEDANY
152 bool "Symmetric Multi-Processing"
154 This enables support for systems with more than one CPU. If
155 you say N here, the kernel will run on single and
156 multiprocessor machines, but will use only one CPU of a
157 multiprocessor machine. If you say Y here, the kernel will run
158 on many, but not all, single processor machines. On a single
159 processor machine, the kernel will run faster if you say N
162 If you don't know what to do here, say N.
165 int "Maximum number of CPUs (2-32)"
170 config CPU_SUPPORTS_32BIT_KERNEL
172 config CPU_SUPPORTS_64BIT_KERNEL
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.
202 prompt "Kernel code model"
207 depends on CPU_SUPPORTS_32BIT_KERNEL
209 Select this option to build a 32-bit kernel.
213 depends on CPU_SUPPORTS_64BIT_KERNEL
215 Select this option to build a 64-bit kernel.
221 source "kernel/Kconfig.preempt"
223 source "kernel/Kconfig.hz"
233 This feature enables support for PCI bus system. If you say Y
234 here, the kernel will include drivers and infrastructure code
235 to support PCI bus devices.
237 If you don't know what to do here, say Y.
242 config PCI_DOMAINS_GENERIC
245 source "drivers/pci/Kconfig"
249 source "init/Kconfig"
251 source "kernel/Kconfig.freezer"
253 menu "Executable file formats"
255 source "fs/Kconfig.binfmt"
259 menu "Power management options"
261 source kernel/power/Kconfig
267 source "drivers/Kconfig"
271 menu "Kernel hacking"
274 bool "Built-in kernel command line"
276 For most platforms, it is firmware or second stage bootloader
277 that by default specifies the kernel command line options.
278 However, it might be necessary or advantageous to either override
279 the default kernel command line or add a few extra options to it.
280 For such cases, this option allows hardcoding command line options
281 directly into the kernel.
283 For that, choose 'Y' here and fill in the extra boot parameters
286 The built-in options will be concatenated to the default command
287 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
288 command line will be ignored and replaced by the built-in string.
291 string "Built-in kernel command string"
292 depends on CMDLINE_BOOL
295 Supply command-line options at build time by entering them here.
297 config CMDLINE_OVERRIDE
298 bool "Built-in command line overrides bootloader arguments"
299 depends on CMDLINE_BOOL
301 Set this option to 'Y' to have the kernel ignore the bootloader
302 or firmware command line. Instead, the built-in command line
303 will be used exclusively.
305 If you don't know what to do here, say N.
310 source "lib/Kconfig.debug"
316 source "security/Kconfig"
318 source "crypto/Kconfig"