1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
6 select HAVE_EXIT_THREAD
7 select HAVE_PERF_EVENTS
8 select USE_PMC if PERF_EVENTS
10 select HAVE_DMA_API_DEBUG
11 select HAVE_KVM if !TILEGX
12 select GENERIC_FIND_FIRST_BIT
13 select SYSCTL_EXCEPTION_TRACE
14 select CC_OPTIMIZE_FOR_SIZE
15 select HAVE_DEBUG_KMEMLEAK
16 select GENERIC_IRQ_PROBE
17 select GENERIC_PENDING_IRQ if SMP
18 select GENERIC_IRQ_SHOW
19 select HAVE_DEBUG_BUGVERBOSE
22 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
23 select ARCH_HAVE_NMI_SAFE_CMPXCHG
24 select GENERIC_CLOCKEVENTS
25 select MODULES_USE_ELF_RELA
26 select HAVE_ARCH_TRACEHOOK
27 select HAVE_SYSCALL_TRACEPOINTS
28 select USER_STACKTRACE_SUPPORT
29 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
30 select HAVE_DEBUG_STACKOVERFLOW
31 select ARCH_WANT_FRAME_POINTERS
32 select HAVE_CONTEXT_TRACKING
34 select GENERIC_STRNCPY_FROM_USER
35 select GENERIC_STRNLEN_USER
36 select HAVE_ARCH_SECCOMP_FILTER
38 # FIXME: investigate whether we need/want these options.
39 # select HAVE_IOREMAP_PROT
40 # select HAVE_OPTPROBES
41 # select HAVE_REGS_AND_STACK_ACCESS_API
42 # select HAVE_HW_BREAKPOINT
44 # select HAVE_USER_RETURN_NOTIFIER
46 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
47 # config HUGETLB_PAGE_SIZE_VARIABLE
55 config HAVE_ARCH_ALLOC_REMAP
58 config HAVE_SETUP_PER_CPU_AREA
61 config NEED_PER_CPU_PAGE_FIRST_CHUNK
64 config SYS_SUPPORTS_HUGETLBFS
67 # Support for additional huge page sizes besides HPAGE_SIZE.
68 # The software support is currently only present in the TILE-Gx
69 # hypervisor. TILEPro in any case does not support page sizes
70 # larger than the default HPAGE_SIZE.
71 config HUGETLB_SUPER_PAGES
72 depends on HUGETLB_PAGE && TILEGX
75 config GENERIC_TIME_VSYSCALL
78 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
82 # FIXME: tilegx can implement a more efficient rwsem.
83 config RWSEM_GENERIC_SPINLOCK
86 # We only support gcc 4.4 and above, so this should work.
87 config ARCH_SUPPORTS_OPTIMIZED_INLINING
90 config ARCH_PHYS_ADDR_T_64BIT
93 config ARCH_DMA_ADDR_T_64BIT
96 config NEED_DMA_MAP_STATE
99 config ARCH_HAS_DMA_SET_COHERENT_MASK
102 config LOCKDEP_SUPPORT
105 config STACKTRACE_SUPPORT
109 # We use discontigmem for now; at some point we may want to switch
110 # to sparsemem (Tilera bug 7996).
111 config ARCH_DISCONTIGMEM_ENABLE
114 config ARCH_DISCONTIGMEM_DEFAULT
117 config TRACE_IRQFLAGS_SUPPORT
123 # SMP is required for Tilera Linux.
130 select HVC_IRQ if TILEGX
133 # Building with ARCH=tilegx (or ARCH=tile) implies using the
134 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
136 def_bool ARCH != "tilepro"
138 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
139 select HAVE_FUNCTION_TRACER
140 select HAVE_FUNCTION_GRAPH_TRACER
141 select HAVE_DYNAMIC_FTRACE
142 select HAVE_FTRACE_MCOUNT_RECORD
144 select HAVE_KRETPROBES
145 select HAVE_ARCH_KGDB
146 select ARCH_SUPPORTS_ATOMIC_RMW
154 config ARCH_DEFCONFIG
156 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
157 default "arch/tile/configs/tilegx_defconfig" if TILEGX
159 config PGTABLE_LEVELS
164 source "init/Kconfig"
166 source "kernel/Kconfig.freezer"
168 menu "Tilera-specific configuration"
171 int "Maximum number of tiles (2-255)"
176 Building with 64 is the recommended value, but a slightly
177 smaller kernel memory footprint results from using a smaller
178 value on chips with fewer tiles.
181 prompt "Kernel page size"
182 default PAGE_SIZE_64KB
184 This lets you select the page size of the kernel. For best
185 performance on memory-intensive applications, a page size of 64KB
186 is recommended. For workloads involving many small files, many
187 connections, etc., it may be better to select 16KB, which uses
188 memory more efficiently at some cost in TLB performance.
190 Note that for TILEPro, you must also rebuild the hypervisor
191 with a matching page size.
194 bool "4KB" if TILEPRO
196 config PAGE_SIZE_16KB
199 config PAGE_SIZE_64KB
204 source "kernel/Kconfig.hz"
207 bool "kexec system call"
210 kexec is a system call that implements the ability to shutdown your
211 current kernel, and to start another kernel. It is like a reboot
212 but it is independent of the system firmware. It is used
213 to implement the "mboot" Tilera booter.
215 The name comes from the similarity to the exec system call.
218 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
220 select COMPAT_BINFMT_ELF
223 If enabled, the kernel will support running TILE-Gx binaries
224 that were built with the -m32 option.
227 bool "Enable seccomp to safely compute untrusted bytecode"
230 This kernel feature is useful for number crunching applications
231 that may need to compute untrusted bytecode during their
232 execution. By using pipes or other transports made available to
233 the process as file descriptors supporting the read/write
234 syscalls, it's possible to isolate those applications in
235 their own address space using seccomp. Once seccomp is
236 enabled via prctl, it cannot be disabled and the task is only
237 allowed to execute a few safe syscalls defined by each seccomp
242 config SYSVIPC_COMPAT
244 depends on COMPAT && SYSVIPC
246 # We do not currently support disabling HIGHMEM on tilepro.
248 bool # "Support for more than 512 MB of RAM"
251 Linux can use the full amount of RAM in the system by
252 default. However, the address space of TILE processors is
253 only 4 Gigabytes large. That means that, if you have a large
254 amount of physical memory, not all of it can be "permanently
255 mapped" by the kernel. The physical memory that's not
256 permanently mapped is called "high memory".
258 If you are compiling a kernel which will never run on a
259 machine with more than 512 MB total physical RAM, answer
260 "false" here. This will result in the kernel mapping all of
261 physical memory into the top 1 GB of virtual memory space.
263 If unsure, say "true".
271 config NEED_SG_DMA_LENGTH
278 select NEED_SG_DMA_LENGTH
279 select ARCH_HAS_DMA_SET_COHERENT_MASK
281 # We do not currently support disabling NUMA.
283 bool # "NUMA Memory Allocation and Scheduler Support"
284 depends on SMP && DISCONTIGMEM
287 NUMA memory allocation is required for TILE processors
288 unless booting with memory striping enabled in the
289 hypervisor, or with only a single memory controller.
290 It is recommended that this option always be enabled.
293 int "Log base 2 of the max number of memory controllers"
295 depends on NEED_MULTIPLE_NODES
297 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
298 In a system with more controllers, this value should be raised.
302 prompt "Memory split" if EXPERT
305 Select the desired split between kernel and user memory.
307 If the address range available to the kernel is less than the
308 physical memory installed, the remaining memory will be available
309 as "high memory". Accessing high memory is a little more costly
310 than low memory, as it needs to be mapped into the kernel first.
311 Note that increasing the kernel address space limits the range
312 available to user programs, making the address space there
313 tighter. Selecting anything other than the default 3G/1G split
314 will also likely make your kernel incompatible with binary-only
317 If you are not absolutely sure what you are doing, leave this
321 bool "3.75G/0.25G user/kernel split (no kernel networking)"
323 bool "3.5G/0.5G user/kernel split"
325 bool "3G/1G user/kernel split"
327 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
329 bool "2.5G/1.5G user/kernel split"
331 bool "2.25G/1.75G user/kernel split"
333 bool "2G/2G user/kernel split"
335 bool "1G/3G user/kernel split"
341 default 0xF0000000 if VMSPLIT_3_75G
342 default 0xE0000000 if VMSPLIT_3_5G
343 default 0xB0000000 if VMSPLIT_2_75G
344 default 0xA0000000 if VMSPLIT_2_5G
345 default 0x90000000 if VMSPLIT_2_25G
346 default 0x80000000 if VMSPLIT_2G
347 default 0x40000000 if VMSPLIT_1G
352 source "kernel/Kconfig.preempt"
355 bool "Built-in kernel command line"
358 Allow for specifying boot arguments to the kernel at
359 build time. On some systems (e.g. embedded ones), it is
360 necessary or convenient to provide some or all of the
361 kernel boot arguments with the kernel itself (that is,
362 to not rely on the boot loader to provide them.)
364 To compile command line arguments into the kernel,
365 set this option to 'Y', then fill in the
366 the boot arguments in CONFIG_CMDLINE.
368 Systems with fully functional boot loaders (e.g. mboot, or
369 if booting over PCI) should leave this option set to 'N'.
372 string "Built-in kernel command string"
373 depends on CMDLINE_BOOL
376 Enter arguments here that should be compiled into the kernel
377 image and used at boot time. If the boot loader provides a
378 command line at boot time, it is appended to this string to
379 form the full kernel command line, when the system boots.
381 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
382 change this behavior.
384 In most cases, the command line (whether built-in or provided
385 by the boot loader) should specify the device for the root
388 config CMDLINE_OVERRIDE
389 bool "Built-in command line overrides boot loader arguments"
391 depends on CMDLINE_BOOL
393 Set this option to 'Y' to have the kernel ignore the boot loader
394 command line, and use ONLY the built-in command line.
396 This is used to work around broken boot loaders. This should
397 be set to 'N' under normal conditions.
399 config VMALLOC_RESERVE
404 bool "Hardwall support to allow access to user dynamic network"
408 int "Processor protection level for kernel"
413 Since MDE 4.2, the Tilera hypervisor runs the kernel
414 at PL2 by default. If running under an older hypervisor,
415 or as a KVM guest, you must run at PL1. (The current
416 hypervisor may also be recompiled with "make HV_PL=2" to
417 allow it to run a kernel at PL1, but clients running at PL1
418 are not expected to be supported indefinitely.)
420 If you're not sure, don't change the default.
422 source "arch/tile/gxio/Kconfig"
424 endmenu # Tilera-specific configuration
432 select GENERIC_PCI_IOMAP
433 select TILE_GXIO_TRIO if TILEGX
434 select PCI_MSI if TILEGX
436 Enable PCI root complex support, so PCIe endpoint devices can
437 be attached to the Tile chip. Many, but not all, PCI devices
438 are supported under Tilera's root complex driver.
450 bool "PCI I/O space support"
455 Enable PCI I/O space support on TILEGx. Since the PCI I/O space
456 is used by few modern PCIe endpoint devices, its support is disabled
457 by default to save the TRIO PIO Region resource for other purposes.
459 source "drivers/pci/Kconfig"
461 source "drivers/pci/pcie/Kconfig"
464 tristate "Tilera USB host adapter support"
468 select TILE_GXIO_USB_HOST
470 Provides USB host adapter support for the built-in EHCI and OHCI
471 interfaces on TILE-Gx chips.
473 source "drivers/pci/hotplug/Kconfig"
477 menu "Executable file formats"
479 source "fs/Kconfig.binfmt"
485 source "drivers/Kconfig"
489 source "arch/tile/Kconfig.debug"
491 source "security/Kconfig"
493 source "crypto/Kconfig"
497 source "arch/tile/kvm/Kconfig"