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
120 # We must be able to map all physical memory into the kernel, but the compiler
121 # is still a bit more efficient when generating code if it's setup in a manner
122 # such that it can only map 2GiB of memory.
124 prompt "Kernel Code Model"
125 default CMODEL_MEDLOW if 32BIT
126 default CMODEL_MEDANY if 64BIT
129 bool "medium low code model"
131 bool "medium any code model"
135 prompt "Maximum Physical Memory"
136 default MAXPHYSMEM_2GB if 32BIT
137 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
138 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
140 config MAXPHYSMEM_2GB
142 config MAXPHYSMEM_128GB
143 depends on 64BIT && CMODEL_MEDANY
149 bool "Symmetric Multi-Processing"
151 This enables support for systems with more than one CPU. If
152 you say N here, the kernel will run on single and
153 multiprocessor machines, but will use only one CPU of a
154 multiprocessor machine. If you say Y here, the kernel will run
155 on many, but not all, single processor machines. On a single
156 processor machine, the kernel will run faster if you say N
159 If you don't know what to do here, say N.
162 int "Maximum number of CPUs (2-32)"
167 config CPU_SUPPORTS_32BIT_KERNEL
169 config CPU_SUPPORTS_64BIT_KERNEL
182 bool "Emit compressed instructions when building Linux"
185 Adds "C" to the ISA subsets that the toolchain is allowed to emit
186 when building Linux, which results in compressed instructions in the
189 If you don't know what to do here, say Y.
199 prompt "Kernel code model"
204 depends on CPU_SUPPORTS_32BIT_KERNEL
206 Select this option to build a 32-bit kernel.
210 depends on CPU_SUPPORTS_64BIT_KERNEL
212 Select this option to build a 64-bit kernel.
218 source "kernel/Kconfig.preempt"
220 source "kernel/Kconfig.hz"
230 This feature enables support for PCI bus system. If you say Y
231 here, the kernel will include drivers and infrastructure code
232 to support PCI bus devices.
234 If you don't know what to do here, say Y.
239 config PCI_DOMAINS_GENERIC
242 source "drivers/pci/Kconfig"
246 source "init/Kconfig"
248 source "kernel/Kconfig.freezer"
250 menu "Executable file formats"
252 source "fs/Kconfig.binfmt"
256 menu "Power management options"
258 source kernel/power/Kconfig
264 source "drivers/Kconfig"
268 menu "Kernel hacking"
271 bool "Built-in kernel command line"
273 For most platforms, it is firmware or second stage bootloader
274 that by default specifies the kernel command line options.
275 However, it might be necessary or advantageous to either override
276 the default kernel command line or add a few extra options to it.
277 For such cases, this option allows hardcoding command line options
278 directly into the kernel.
280 For that, choose 'Y' here and fill in the extra boot parameters
283 The built-in options will be concatenated to the default command
284 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
285 command line will be ignored and replaced by the built-in string.
288 string "Built-in kernel command string"
289 depends on CMDLINE_BOOL
292 Supply command-line options at build time by entering them here.
294 config CMDLINE_OVERRIDE
295 bool "Built-in command line overrides bootloader arguments"
296 depends on CMDLINE_BOOL
298 Set this option to 'Y' to have the kernel ignore the bootloader
299 or firmware command line. Instead, the built-in command line
300 will be used exclusively.
302 If you don't know what to do here, say N.
307 source "lib/Kconfig.debug"
313 source "security/Kconfig"
315 source "crypto/Kconfig"