1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
6 select ARCH_HAS_DEVMEM_IS_ALLOWED
7 select ARCH_HAVE_NMI_SAFE_CMPXCHG
8 select ARCH_WANT_FRAME_POINTERS
9 select CC_OPTIMIZE_FOR_SIZE
11 select GENERIC_CLOCKEVENTS
12 select GENERIC_FIND_FIRST_BIT
13 select GENERIC_IRQ_PROBE
14 select GENERIC_IRQ_SHOW
15 select GENERIC_PENDING_IRQ if SMP
16 select GENERIC_STRNCPY_FROM_USER
17 select GENERIC_STRNLEN_USER
18 select HAVE_ARCH_SECCOMP_FILTER
19 select HAVE_ARCH_TRACEHOOK
20 select HAVE_CONTEXT_TRACKING
21 select HAVE_DEBUG_BUGVERBOSE
22 select HAVE_DEBUG_KMEMLEAK
23 select HAVE_DEBUG_STACKOVERFLOW
24 select HAVE_DMA_API_DEBUG
25 select HAVE_EXIT_THREAD
26 select HAVE_KVM if !TILEGX
27 select HAVE_NMI if USE_PMC
28 select HAVE_PERF_EVENTS
29 select HAVE_SYSCALL_TRACEPOINTS
30 select MODULES_USE_ELF_RELA
31 select SYSCTL_EXCEPTION_TRACE
33 select USER_STACKTRACE_SUPPORT
34 select USE_PMC if PERF_EVENTS
43 config HAVE_ARCH_ALLOC_REMAP
46 config HAVE_SETUP_PER_CPU_AREA
49 config NEED_PER_CPU_PAGE_FIRST_CHUNK
52 config SYS_SUPPORTS_HUGETLBFS
55 # Support for additional huge page sizes besides HPAGE_SIZE.
56 # The software support is currently only present in the TILE-Gx
57 # hypervisor. TILEPro in any case does not support page sizes
58 # larger than the default HPAGE_SIZE.
59 config HUGETLB_SUPER_PAGES
60 depends on HUGETLB_PAGE && TILEGX
63 config GENERIC_TIME_VSYSCALL
66 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
70 # FIXME: tilegx can implement a more efficient rwsem.
71 config RWSEM_GENERIC_SPINLOCK
74 # We only support gcc 4.4 and above, so this should work.
75 config ARCH_SUPPORTS_OPTIMIZED_INLINING
78 config ARCH_PHYS_ADDR_T_64BIT
81 config ARCH_DMA_ADDR_T_64BIT
84 config NEED_DMA_MAP_STATE
87 config ARCH_HAS_DMA_SET_COHERENT_MASK
90 config LOCKDEP_SUPPORT
93 config STACKTRACE_SUPPORT
97 # We use discontigmem for now; at some point we may want to switch
98 # to sparsemem (Tilera bug 7996).
99 config ARCH_DISCONTIGMEM_ENABLE
102 config ARCH_DISCONTIGMEM_DEFAULT
105 config TRACE_IRQFLAGS_SUPPORT
108 # SMP is required for Tilera Linux.
115 select HVC_IRQ if TILEGX
118 # Building with ARCH=tilegx (or ARCH=tile) implies using the
119 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
121 def_bool ARCH != "tilepro"
122 select ARCH_SUPPORTS_ATOMIC_RMW
123 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
124 select HAVE_ARCH_JUMP_LABEL
125 select HAVE_ARCH_KGDB
126 select HAVE_DYNAMIC_FTRACE
127 select HAVE_FTRACE_MCOUNT_RECORD
128 select HAVE_FUNCTION_GRAPH_TRACER
129 select HAVE_FUNCTION_TRACER
131 select HAVE_KRETPROBES
140 config ARCH_DEFCONFIG
142 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
143 default "arch/tile/configs/tilegx_defconfig" if TILEGX
145 config PGTABLE_LEVELS
150 source "init/Kconfig"
152 source "kernel/Kconfig.freezer"
154 menu "Tilera-specific configuration"
157 int "Maximum number of tiles (2-255)"
162 Building with 64 is the recommended value, but a slightly
163 smaller kernel memory footprint results from using a smaller
164 value on chips with fewer tiles.
167 prompt "Kernel page size"
168 default PAGE_SIZE_64KB
170 This lets you select the page size of the kernel. For best
171 performance on memory-intensive applications, a page size of 64KB
172 is recommended. For workloads involving many small files, many
173 connections, etc., it may be better to select 16KB, which uses
174 memory more efficiently at some cost in TLB performance.
176 Note that for TILEPro, you must also rebuild the hypervisor
177 with a matching page size.
180 bool "4KB" if TILEPRO
182 config PAGE_SIZE_16KB
185 config PAGE_SIZE_64KB
190 source "kernel/Kconfig.hz"
193 bool "kexec system call"
196 kexec is a system call that implements the ability to shutdown your
197 current kernel, and to start another kernel. It is like a reboot
198 but it is independent of the system firmware. It is used
199 to implement the "mboot" Tilera booter.
201 The name comes from the similarity to the exec system call.
204 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
206 select COMPAT_BINFMT_ELF
209 If enabled, the kernel will support running TILE-Gx binaries
210 that were built with the -m32 option.
213 bool "Enable seccomp to safely compute untrusted bytecode"
216 This kernel feature is useful for number crunching applications
217 that may need to compute untrusted bytecode during their
218 execution. By using pipes or other transports made available to
219 the process as file descriptors supporting the read/write
220 syscalls, it's possible to isolate those applications in
221 their own address space using seccomp. Once seccomp is
222 enabled via prctl, it cannot be disabled and the task is only
223 allowed to execute a few safe syscalls defined by each seccomp
228 config SYSVIPC_COMPAT
230 depends on COMPAT && SYSVIPC
232 # We do not currently support disabling HIGHMEM on tilepro.
234 bool # "Support for more than 512 MB of RAM"
237 Linux can use the full amount of RAM in the system by
238 default. However, the address space of TILE processors is
239 only 4 Gigabytes large. That means that, if you have a large
240 amount of physical memory, not all of it can be "permanently
241 mapped" by the kernel. The physical memory that's not
242 permanently mapped is called "high memory".
244 If you are compiling a kernel which will never run on a
245 machine with more than 512 MB total physical RAM, answer
246 "false" here. This will result in the kernel mapping all of
247 physical memory into the top 1 GB of virtual memory space.
249 If unsure, say "true".
257 config NEED_SG_DMA_LENGTH
264 select NEED_SG_DMA_LENGTH
265 select ARCH_HAS_DMA_SET_COHERENT_MASK
267 # We do not currently support disabling NUMA.
269 bool # "NUMA Memory Allocation and Scheduler Support"
270 depends on SMP && DISCONTIGMEM
273 NUMA memory allocation is required for TILE processors
274 unless booting with memory striping enabled in the
275 hypervisor, or with only a single memory controller.
276 It is recommended that this option always be enabled.
279 int "Log base 2 of the max number of memory controllers"
281 depends on NEED_MULTIPLE_NODES
283 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
284 In a system with more controllers, this value should be raised.
288 prompt "Memory split" if EXPERT
291 Select the desired split between kernel and user memory.
293 If the address range available to the kernel is less than the
294 physical memory installed, the remaining memory will be available
295 as "high memory". Accessing high memory is a little more costly
296 than low memory, as it needs to be mapped into the kernel first.
297 Note that increasing the kernel address space limits the range
298 available to user programs, making the address space there
299 tighter. Selecting anything other than the default 3G/1G split
300 will also likely make your kernel incompatible with binary-only
303 If you are not absolutely sure what you are doing, leave this
307 bool "3.75G/0.25G user/kernel split (no kernel networking)"
309 bool "3.5G/0.5G user/kernel split"
311 bool "3G/1G user/kernel split"
313 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
315 bool "2.5G/1.5G user/kernel split"
317 bool "2.25G/1.75G user/kernel split"
319 bool "2G/2G user/kernel split"
321 bool "1G/3G user/kernel split"
327 default 0xF0000000 if VMSPLIT_3_75G
328 default 0xE0000000 if VMSPLIT_3_5G
329 default 0xB0000000 if VMSPLIT_2_75G
330 default 0xA0000000 if VMSPLIT_2_5G
331 default 0x90000000 if VMSPLIT_2_25G
332 default 0x80000000 if VMSPLIT_2G
333 default 0x40000000 if VMSPLIT_1G
338 source "kernel/Kconfig.preempt"
341 bool "Built-in kernel command line"
344 Allow for specifying boot arguments to the kernel at
345 build time. On some systems (e.g. embedded ones), it is
346 necessary or convenient to provide some or all of the
347 kernel boot arguments with the kernel itself (that is,
348 to not rely on the boot loader to provide them.)
350 To compile command line arguments into the kernel,
351 set this option to 'Y', then fill in the
352 the boot arguments in CONFIG_CMDLINE.
354 Systems with fully functional boot loaders (e.g. mboot, or
355 if booting over PCI) should leave this option set to 'N'.
358 string "Built-in kernel command string"
359 depends on CMDLINE_BOOL
362 Enter arguments here that should be compiled into the kernel
363 image and used at boot time. If the boot loader provides a
364 command line at boot time, it is appended to this string to
365 form the full kernel command line, when the system boots.
367 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
368 change this behavior.
370 In most cases, the command line (whether built-in or provided
371 by the boot loader) should specify the device for the root
374 config CMDLINE_OVERRIDE
375 bool "Built-in command line overrides boot loader arguments"
377 depends on CMDLINE_BOOL
379 Set this option to 'Y' to have the kernel ignore the boot loader
380 command line, and use ONLY the built-in command line.
382 This is used to work around broken boot loaders. This should
383 be set to 'N' under normal conditions.
385 config VMALLOC_RESERVE
390 bool "Hardwall support to allow access to user dynamic network"
394 int "Processor protection level for kernel"
399 Since MDE 4.2, the Tilera hypervisor runs the kernel
400 at PL2 by default. If running under an older hypervisor,
401 or as a KVM guest, you must run at PL1. (The current
402 hypervisor may also be recompiled with "make HV_PL=2" to
403 allow it to run a kernel at PL1, but clients running at PL1
404 are not expected to be supported indefinitely.)
406 If you're not sure, don't change the default.
408 source "arch/tile/gxio/Kconfig"
410 endmenu # Tilera-specific configuration
418 select GENERIC_PCI_IOMAP
419 select TILE_GXIO_TRIO if TILEGX
420 select PCI_MSI if TILEGX
422 Enable PCI root complex support, so PCIe endpoint devices can
423 be attached to the Tile chip. Many, but not all, PCI devices
424 are supported under Tilera's root complex driver.
436 bool "PCI I/O space support"
441 Enable PCI I/O space support on TILEGx. Since the PCI I/O space
442 is used by few modern PCIe endpoint devices, its support is disabled
443 by default to save the TRIO PIO Region resource for other purposes.
445 source "drivers/pci/Kconfig"
448 tristate "Tilera USB host adapter support"
452 select TILE_GXIO_USB_HOST
454 Provides USB host adapter support for the built-in EHCI and OHCI
455 interfaces on TILE-Gx chips.
459 menu "Executable file formats"
461 source "fs/Kconfig.binfmt"
467 source "drivers/Kconfig"
471 source "arch/tile/Kconfig.debug"
473 source "security/Kconfig"
475 source "crypto/Kconfig"
479 source "arch/tile/kvm/Kconfig"