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
36 select GENERIC_IRQ_MULTI_HANDLER
41 # even on 32-bit, physical (and DMA) addresses are > 32-bits
42 config ARCH_PHYS_ADDR_T_64BIT
49 config ARCH_DMA_ADDR_T_64BIT
54 default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
55 default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
56 default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
58 config STACKTRACE_SUPPORT
61 config TRACE_IRQFLAGS_SUPPORT
64 config RWSEM_GENERIC_SPINLOCK
70 select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
72 config GENERIC_BUG_RELATIVE_POINTERS
75 config GENERIC_CALIBRATE_DELAY
81 config GENERIC_HWEIGHT
101 This selects the base ISA that this kernel will traget and must match
106 select CPU_SUPPORTS_32BIT_KERNEL
108 select GENERIC_ASHLDI3
109 select GENERIC_ASHRDI3
110 select GENERIC_LSHRDI3
114 select CPU_SUPPORTS_64BIT_KERNEL
116 select HAVE_FUNCTION_TRACER
117 select HAVE_FUNCTION_GRAPH_TRACER
118 select HAVE_FTRACE_MCOUNT_RECORD
119 select HAVE_DYNAMIC_FTRACE
120 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)"
176 config CPU_SUPPORTS_32BIT_KERNEL
178 config CPU_SUPPORTS_64BIT_KERNEL
191 bool "Emit compressed instructions when building Linux"
194 Adds "C" to the ISA subsets that the toolchain is allowed to emit
195 when building Linux, which results in compressed instructions in the
198 If you don't know what to do here, say Y.
208 prompt "Kernel code model"
213 depends on CPU_SUPPORTS_32BIT_KERNEL
215 Select this option to build a 32-bit kernel.
219 depends on CPU_SUPPORTS_64BIT_KERNEL
221 Select this option to build a 64-bit kernel.
227 source "kernel/Kconfig.preempt"
229 source "kernel/Kconfig.hz"
239 This feature enables support for PCI bus system. If you say Y
240 here, the kernel will include drivers and infrastructure code
241 to support PCI bus devices.
243 If you don't know what to do here, say Y.
248 config PCI_DOMAINS_GENERIC
251 source "drivers/pci/Kconfig"
255 source "init/Kconfig"
257 source "kernel/Kconfig.freezer"
259 menu "Executable file formats"
261 source "fs/Kconfig.binfmt"
265 menu "Power management options"
267 source kernel/power/Kconfig
273 source "drivers/Kconfig"
277 menu "Kernel hacking"
280 bool "Built-in kernel command line"
282 For most platforms, it is firmware or second stage bootloader
283 that by default specifies the kernel command line options.
284 However, it might be necessary or advantageous to either override
285 the default kernel command line or add a few extra options to it.
286 For such cases, this option allows hardcoding command line options
287 directly into the kernel.
289 For that, choose 'Y' here and fill in the extra boot parameters
292 The built-in options will be concatenated to the default command
293 line if CMDLINE_FORCE is set to 'N'. Otherwise, the default
294 command line will be ignored and replaced by the built-in string.
297 string "Built-in kernel command string"
298 depends on CMDLINE_BOOL
301 Supply command-line options at build time by entering them here.
304 bool "Built-in command line overrides bootloader arguments"
305 depends on CMDLINE_BOOL
307 Set this option to 'Y' to have the kernel ignore the bootloader
308 or firmware command line. Instead, the built-in command line
309 will be used exclusively.
311 If you don't know what to do here, say N.
316 source "lib/Kconfig.debug"
322 source "security/Kconfig"
324 source "crypto/Kconfig"