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_HAS_ATOMIC64_DEC_IF_POSITIVE
12 select ARCH_WANT_FRAME_POINTERS
13 select CLONE_BACKWARDS
15 select GENERIC_CLOCKEVENTS
16 select GENERIC_CPU_DEVICES
17 select GENERIC_IRQ_SHOW
18 select GENERIC_PCI_IOMAP
19 select GENERIC_STRNCPY_FROM_USER
20 select GENERIC_STRNLEN_USER
21 select GENERIC_SMP_IDLE_THREAD
22 select GENERIC_ATOMIC64 if !64BIT || !RISCV_ISA_A
23 select ARCH_WANT_OPTIONAL_GPIOLIB
25 select HAVE_DMA_API_DEBUG
26 select HAVE_DMA_CONTIGUOUS
27 select HAVE_GENERIC_DMA_COHERENT
30 select RISCV_ISA_A if SMP
32 select SYSCTL_EXCEPTION_TRACE
33 select HAVE_ARCH_TRACEHOOK
34 select MODULES_USE_ELF_RELA if MODULES
35 select THREAD_INFO_IN_TASK
42 # even on 32-bit, physical (and DMA) addresses are > 32-bits
43 config ARCH_PHYS_ADDR_T_64BIT
46 config ARCH_DMA_ADDR_T_64BIT
51 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
52 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
53 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
55 config STACKTRACE_SUPPORT
58 config RWSEM_GENERIC_SPINLOCK
64 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
66 config GENERIC_BUG_RELATIVE_POINTERS
69 config GENERIC_CALIBRATE_DELAY
75 config GENERIC_HWEIGHT
95 This selects the base ISA that this kernel will traget and must match
100 select CPU_SUPPORTS_32BIT_KERNEL
102 select GENERIC_ASHLDI3
103 select GENERIC_ASHRDI3
104 select GENERIC_LSHRDI3
108 select CPU_SUPPORTS_64BIT_KERNEL
113 # We must be able to map all physical memory into the kernel, but the compiler
114 # is still a bit more efficient when generating code if it's setup in a manner
115 # such that it can only map 2GiB of memory.
117 prompt "Kernel Code Model"
118 default CMODEL_MEDLOW if 32BIT
119 default CMODEL_MEDANY if 64BIT
122 bool "medium low code model"
124 bool "medium any code model"
128 prompt "Maximum Physical Memory"
129 default MAXPHYSMEM_2GB if 32BIT
130 default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
131 default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
133 config MAXPHYSMEM_2GB
135 config MAXPHYSMEM_128GB
136 depends on 64BIT && CMODEL_MEDANY
142 bool "Symmetric Multi-Processing"
144 This enables support for systems with more than one CPU. If
145 you say N here, the kernel will run on single and
146 multiprocessor machines, but will use only one CPU of a
147 multiprocessor machine. If you say Y here, the kernel will run
148 on many, but not all, single processor machines. On a single
149 processor machine, the kernel will run faster if you say N
152 If you don't know what to do here, say N.
155 int "Maximum number of CPUs (2-32)"
160 config CPU_SUPPORTS_32BIT_KERNEL
162 config CPU_SUPPORTS_64BIT_KERNEL
175 bool "Emit compressed instructions when building Linux"
178 Adds "C" to the ISA subsets that the toolchain is allowed to emit
179 when building Linux, which results in compressed instructions in the
182 If you don't know what to do here, say Y.
192 prompt "Kernel code model"
197 depends on CPU_SUPPORTS_32BIT_KERNEL
199 Select this option to build a 32-bit kernel.
203 depends on CPU_SUPPORTS_64BIT_KERNEL
205 Select this option to build a 64-bit kernel.
211 source "kernel/Kconfig.preempt"
213 source "kernel/Kconfig.hz"
223 This feature enables support for PCI bus system. If you say Y
224 here, the kernel will include drivers and infrastructure code
225 to support PCI bus devices.
227 If you don't know what to do here, say Y.
232 config PCI_DOMAINS_GENERIC
235 source "drivers/pci/Kconfig"
239 source "init/Kconfig"
241 source "kernel/Kconfig.freezer"
243 menu "Executable file formats"
245 source "fs/Kconfig.binfmt"
249 menu "Power management options"
251 source kernel/power/Kconfig
257 source "drivers/Kconfig"
261 menu "Kernel hacking"
264 bool "Built-in kernel command line"
266 For most platforms, it is firmware or second stage bootloader
267 that by default specifies the kernel command line options.
268 However, it might be necessary or advantageous to either override
269 the default kernel command line or add a few extra options to it.
270 For such cases, this option allows hardcoding command line options
271 directly into the kernel.
273 For that, choose 'Y' here and fill in the extra boot parameters
276 The built-in options will be concatenated to the default command
277 line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
278 command line will be ignored and replaced by the built-in string.
281 string "Built-in kernel command string"
282 depends on CMDLINE_BOOL
285 Supply command-line options at build time by entering them here.
287 config CMDLINE_OVERRIDE
288 bool "Built-in command line overrides bootloader arguments"
289 depends on CMDLINE_BOOL
291 Set this option to 'Y' to have the kernel ignore the bootloader
292 or firmware command line. Instead, the built-in command line
293 will be used exclusively.
295 If you don't know what to do here, say N.
300 source "lib/Kconfig.debug"
306 source "security/Kconfig"
308 source "crypto/Kconfig"