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.
215 source "kernel/Kconfig.hz"
225 This feature enables support for PCI bus system. If you say Y
226 here, the kernel will include drivers and infrastructure code
227 to support PCI bus devices.
229 If you don't know what to do here, say Y.
234 config PCI_DOMAINS_GENERIC
237 source "drivers/pci/Kconfig"
241 menu "Power management options"
243 source kernel/power/Kconfig