1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
6 select HAVE_PERF_EVENTS
7 select USE_PMC if PERF_EVENTS
9 select HAVE_DMA_API_DEBUG
10 select HAVE_KVM if !TILEGX
11 select GENERIC_FIND_FIRST_BIT
12 select SYSCTL_EXCEPTION_TRACE
13 select CC_OPTIMIZE_FOR_SIZE
14 select HAVE_DEBUG_KMEMLEAK
15 select GENERIC_IRQ_PROBE
16 select GENERIC_PENDING_IRQ if SMP
17 select GENERIC_IRQ_SHOW
18 select HAVE_DEBUG_BUGVERBOSE
21 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
22 select ARCH_HAVE_NMI_SAFE_CMPXCHG
23 select GENERIC_CLOCKEVENTS
24 select MODULES_USE_ELF_RELA
25 select HAVE_ARCH_TRACEHOOK
26 select HAVE_SYSCALL_TRACEPOINTS
27 select USER_STACKTRACE_SUPPORT
28 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
29 select HAVE_DEBUG_STACKOVERFLOW
30 select ARCH_WANT_FRAME_POINTERS
31 select HAVE_CONTEXT_TRACKING
33 select GENERIC_STRNCPY_FROM_USER
34 select GENERIC_STRNLEN_USER
35 select HAVE_ARCH_SECCOMP_FILTER
37 # FIXME: investigate whether we need/want these options.
38 # select HAVE_IOREMAP_PROT
39 # select HAVE_OPTPROBES
40 # select HAVE_REGS_AND_STACK_ACCESS_API
41 # select HAVE_HW_BREAKPOINT
43 # select HAVE_USER_RETURN_NOTIFIER
45 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
46 # config HUGETLB_PAGE_SIZE_VARIABLE
54 config HAVE_ARCH_ALLOC_REMAP
57 config HAVE_SETUP_PER_CPU_AREA
60 config NEED_PER_CPU_PAGE_FIRST_CHUNK
63 config SYS_SUPPORTS_HUGETLBFS
66 # Support for additional huge page sizes besides HPAGE_SIZE.
67 # The software support is currently only present in the TILE-Gx
68 # hypervisor. TILEPro in any case does not support page sizes
69 # larger than the default HPAGE_SIZE.
70 config HUGETLB_SUPER_PAGES
71 depends on HUGETLB_PAGE && TILEGX
74 config GENERIC_TIME_VSYSCALL
77 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
81 # FIXME: tilegx can implement a more efficient rwsem.
82 config RWSEM_GENERIC_SPINLOCK
85 # We only support gcc 4.4 and above, so this should work.
86 config ARCH_SUPPORTS_OPTIMIZED_INLINING
89 config ARCH_PHYS_ADDR_T_64BIT
92 config ARCH_DMA_ADDR_T_64BIT
95 config NEED_DMA_MAP_STATE
98 config ARCH_HAS_DMA_SET_COHERENT_MASK
101 config LOCKDEP_SUPPORT
104 config STACKTRACE_SUPPORT
108 # We use discontigmem for now; at some point we may want to switch
109 # to sparsemem (Tilera bug 7996).
110 config ARCH_DISCONTIGMEM_ENABLE
113 config ARCH_DISCONTIGMEM_DEFAULT
116 config TRACE_IRQFLAGS_SUPPORT
122 # SMP is required for Tilera Linux.
129 select HVC_IRQ if TILEGX
132 # Building with ARCH=tilegx (or ARCH=tile) implies using the
133 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
135 def_bool ARCH != "tilepro"
137 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
138 select HAVE_FUNCTION_TRACER
139 select HAVE_FUNCTION_GRAPH_TRACER
140 select HAVE_DYNAMIC_FTRACE
141 select HAVE_FTRACE_MCOUNT_RECORD
143 select HAVE_KRETPROBES
144 select HAVE_ARCH_KGDB
145 select ARCH_SUPPORTS_ATOMIC_RMW
153 config ARCH_DEFCONFIG
155 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
156 default "arch/tile/configs/tilegx_defconfig" if TILEGX
158 config PGTABLE_LEVELS
163 source "init/Kconfig"
165 source "kernel/Kconfig.freezer"
167 menu "Tilera-specific configuration"
170 int "Maximum number of tiles (2-255)"
175 Building with 64 is the recommended value, but a slightly
176 smaller kernel memory footprint results from using a smaller
177 value on chips with fewer tiles.
180 prompt "Kernel page size"
181 default PAGE_SIZE_64KB
183 This lets you select the page size of the kernel. For best
184 performance on memory-intensive applications, a page size of 64KB
185 is recommended. For workloads involving many small files, many
186 connections, etc., it may be better to select 16KB, which uses
187 memory more efficiently at some cost in TLB performance.
189 Note that for TILEPro, you must also rebuild the hypervisor
190 with a matching page size.
193 bool "4KB" if TILEPRO
195 config PAGE_SIZE_16KB
198 config PAGE_SIZE_64KB
203 source "kernel/Kconfig.hz"
206 bool "kexec system call"
209 kexec is a system call that implements the ability to shutdown your
210 current kernel, and to start another kernel. It is like a reboot
211 but it is independent of the system firmware. It is used
212 to implement the "mboot" Tilera booter.
214 The name comes from the similarity to the exec system call.
217 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
219 select COMPAT_BINFMT_ELF
222 If enabled, the kernel will support running TILE-Gx binaries
223 that were built with the -m32 option.
226 bool "Enable seccomp to safely compute untrusted bytecode"
229 This kernel feature is useful for number crunching applications
230 that may need to compute untrusted bytecode during their
231 execution. By using pipes or other transports made available to
232 the process as file descriptors supporting the read/write
233 syscalls, it's possible to isolate those applications in
234 their own address space using seccomp. Once seccomp is
235 enabled via prctl, it cannot be disabled and the task is only
236 allowed to execute a few safe syscalls defined by each seccomp
241 config SYSVIPC_COMPAT
243 depends on COMPAT && SYSVIPC
245 # We do not currently support disabling HIGHMEM on tilepro.
247 bool # "Support for more than 512 MB of RAM"
250 Linux can use the full amount of RAM in the system by
251 default. However, the address space of TILE processors is
252 only 4 Gigabytes large. That means that, if you have a large
253 amount of physical memory, not all of it can be "permanently
254 mapped" by the kernel. The physical memory that's not
255 permanently mapped is called "high memory".
257 If you are compiling a kernel which will never run on a
258 machine with more than 512 MB total physical RAM, answer
259 "false" here. This will result in the kernel mapping all of
260 physical memory into the top 1 GB of virtual memory space.
262 If unsure, say "true".
270 config NEED_SG_DMA_LENGTH
277 select NEED_SG_DMA_LENGTH
278 select ARCH_HAS_DMA_SET_COHERENT_MASK
280 # We do not currently support disabling NUMA.
282 bool # "NUMA Memory Allocation and Scheduler Support"
283 depends on SMP && DISCONTIGMEM
286 NUMA memory allocation is required for TILE processors
287 unless booting with memory striping enabled in the
288 hypervisor, or with only a single memory controller.
289 It is recommended that this option always be enabled.
292 int "Log base 2 of the max number of memory controllers"
294 depends on NEED_MULTIPLE_NODES
296 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
297 In a system with more controllers, this value should be raised.
301 prompt "Memory split" if EXPERT
304 Select the desired split between kernel and user memory.
306 If the address range available to the kernel is less than the
307 physical memory installed, the remaining memory will be available
308 as "high memory". Accessing high memory is a little more costly
309 than low memory, as it needs to be mapped into the kernel first.
310 Note that increasing the kernel address space limits the range
311 available to user programs, making the address space there
312 tighter. Selecting anything other than the default 3G/1G split
313 will also likely make your kernel incompatible with binary-only
316 If you are not absolutely sure what you are doing, leave this
320 bool "3.75G/0.25G user/kernel split (no kernel networking)"
322 bool "3.5G/0.5G user/kernel split"
324 bool "3G/1G user/kernel split"
326 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
328 bool "2.5G/1.5G user/kernel split"
330 bool "2.25G/1.75G user/kernel split"
332 bool "2G/2G user/kernel split"
334 bool "1G/3G user/kernel split"
340 default 0xF0000000 if VMSPLIT_3_75G
341 default 0xE0000000 if VMSPLIT_3_5G
342 default 0xB0000000 if VMSPLIT_2_75G
343 default 0xA0000000 if VMSPLIT_2_5G
344 default 0x90000000 if VMSPLIT_2_25G
345 default 0x80000000 if VMSPLIT_2G
346 default 0x40000000 if VMSPLIT_1G
351 source "kernel/Kconfig.preempt"
354 bool "Built-in kernel command line"
357 Allow for specifying boot arguments to the kernel at
358 build time. On some systems (e.g. embedded ones), it is
359 necessary or convenient to provide some or all of the
360 kernel boot arguments with the kernel itself (that is,
361 to not rely on the boot loader to provide them.)
363 To compile command line arguments into the kernel,
364 set this option to 'Y', then fill in the
365 the boot arguments in CONFIG_CMDLINE.
367 Systems with fully functional boot loaders (e.g. mboot, or
368 if booting over PCI) should leave this option set to 'N'.
371 string "Built-in kernel command string"
372 depends on CMDLINE_BOOL
375 Enter arguments here that should be compiled into the kernel
376 image and used at boot time. If the boot loader provides a
377 command line at boot time, it is appended to this string to
378 form the full kernel command line, when the system boots.
380 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
381 change this behavior.
383 In most cases, the command line (whether built-in or provided
384 by the boot loader) should specify the device for the root
387 config CMDLINE_OVERRIDE
388 bool "Built-in command line overrides boot loader arguments"
390 depends on CMDLINE_BOOL
392 Set this option to 'Y' to have the kernel ignore the boot loader
393 command line, and use ONLY the built-in command line.
395 This is used to work around broken boot loaders. This should
396 be set to 'N' under normal conditions.
398 config VMALLOC_RESERVE
403 bool "Hardwall support to allow access to user dynamic network"
407 int "Processor protection level for kernel"
412 Since MDE 4.2, the Tilera hypervisor runs the kernel
413 at PL2 by default. If running under an older hypervisor,
414 or as a KVM guest, you must run at PL1. (The current
415 hypervisor may also be recompiled with "make HV_PL=2" to
416 allow it to run a kernel at PL1, but clients running at PL1
417 are not expected to be supported indefinitely.)
419 If you're not sure, don't change the default.
421 source "arch/tile/gxio/Kconfig"
423 endmenu # Tilera-specific configuration
431 select GENERIC_PCI_IOMAP
432 select TILE_GXIO_TRIO if TILEGX
433 select PCI_MSI if TILEGX
435 Enable PCI root complex support, so PCIe endpoint devices can
436 be attached to the Tile chip. Many, but not all, PCI devices
437 are supported under Tilera's root complex driver.
449 bool "PCI I/O space support"
454 Enable PCI I/O space support on TILEGx. Since the PCI I/O space
455 is used by few modern PCIe endpoint devices, its support is disabled
456 by default to save the TRIO PIO Region resource for other purposes.
458 source "drivers/pci/Kconfig"
460 source "drivers/pci/pcie/Kconfig"
463 tristate "Tilera USB host adapter support"
467 select TILE_GXIO_USB_HOST
469 Provides USB host adapter support for the built-in EHCI and OHCI
470 interfaces on TILE-Gx chips.
472 source "drivers/pci/hotplug/Kconfig"
476 menu "Executable file formats"
478 source "fs/Kconfig.binfmt"
484 source "drivers/Kconfig"
488 source "arch/tile/Kconfig.debug"
490 source "security/Kconfig"
492 source "crypto/Kconfig"
496 source "arch/tile/kvm/Kconfig"