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
8 select HAVE_DMA_API_DEBUG
9 select HAVE_KVM if !TILEGX
10 select GENERIC_FIND_FIRST_BIT
11 select SYSCTL_EXCEPTION_TRACE
12 select CC_OPTIMIZE_FOR_SIZE
13 select HAVE_DEBUG_KMEMLEAK
14 select GENERIC_IRQ_PROBE
15 select GENERIC_PENDING_IRQ if SMP
16 select GENERIC_IRQ_SHOW
17 select HAVE_DEBUG_BUGVERBOSE
20 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
21 select ARCH_HAS_DEVMEM_IS_ALLOWED
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
119 # SMP is required for Tilera Linux.
126 select HVC_IRQ if TILEGX
129 # Building with ARCH=tilegx (or ARCH=tile) implies using the
130 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
132 def_bool ARCH != "tilepro"
134 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
135 select HAVE_FUNCTION_TRACER
136 select HAVE_FUNCTION_GRAPH_TRACER
137 select HAVE_DYNAMIC_FTRACE
138 select HAVE_FTRACE_MCOUNT_RECORD
140 select HAVE_KRETPROBES
141 select HAVE_ARCH_KGDB
142 select ARCH_SUPPORTS_ATOMIC_RMW
143 select HAVE_ARCH_JUMP_LABEL
151 config ARCH_DEFCONFIG
153 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
154 default "arch/tile/configs/tilegx_defconfig" if TILEGX
156 config PGTABLE_LEVELS
161 source "init/Kconfig"
163 source "kernel/Kconfig.freezer"
165 menu "Tilera-specific configuration"
168 int "Maximum number of tiles (2-255)"
173 Building with 64 is the recommended value, but a slightly
174 smaller kernel memory footprint results from using a smaller
175 value on chips with fewer tiles.
178 prompt "Kernel page size"
179 default PAGE_SIZE_64KB
181 This lets you select the page size of the kernel. For best
182 performance on memory-intensive applications, a page size of 64KB
183 is recommended. For workloads involving many small files, many
184 connections, etc., it may be better to select 16KB, which uses
185 memory more efficiently at some cost in TLB performance.
187 Note that for TILEPro, you must also rebuild the hypervisor
188 with a matching page size.
191 bool "4KB" if TILEPRO
193 config PAGE_SIZE_16KB
196 config PAGE_SIZE_64KB
201 source "kernel/Kconfig.hz"
204 bool "kexec system call"
207 kexec is a system call that implements the ability to shutdown your
208 current kernel, and to start another kernel. It is like a reboot
209 but it is independent of the system firmware. It is used
210 to implement the "mboot" Tilera booter.
212 The name comes from the similarity to the exec system call.
215 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
217 select COMPAT_BINFMT_ELF
220 If enabled, the kernel will support running TILE-Gx binaries
221 that were built with the -m32 option.
224 bool "Enable seccomp to safely compute untrusted bytecode"
227 This kernel feature is useful for number crunching applications
228 that may need to compute untrusted bytecode during their
229 execution. By using pipes or other transports made available to
230 the process as file descriptors supporting the read/write
231 syscalls, it's possible to isolate those applications in
232 their own address space using seccomp. Once seccomp is
233 enabled via prctl, it cannot be disabled and the task is only
234 allowed to execute a few safe syscalls defined by each seccomp
239 config SYSVIPC_COMPAT
241 depends on COMPAT && SYSVIPC
243 # We do not currently support disabling HIGHMEM on tilepro.
245 bool # "Support for more than 512 MB of RAM"
248 Linux can use the full amount of RAM in the system by
249 default. However, the address space of TILE processors is
250 only 4 Gigabytes large. That means that, if you have a large
251 amount of physical memory, not all of it can be "permanently
252 mapped" by the kernel. The physical memory that's not
253 permanently mapped is called "high memory".
255 If you are compiling a kernel which will never run on a
256 machine with more than 512 MB total physical RAM, answer
257 "false" here. This will result in the kernel mapping all of
258 physical memory into the top 1 GB of virtual memory space.
260 If unsure, say "true".
268 config NEED_SG_DMA_LENGTH
275 select NEED_SG_DMA_LENGTH
276 select ARCH_HAS_DMA_SET_COHERENT_MASK
278 # We do not currently support disabling NUMA.
280 bool # "NUMA Memory Allocation and Scheduler Support"
281 depends on SMP && DISCONTIGMEM
284 NUMA memory allocation is required for TILE processors
285 unless booting with memory striping enabled in the
286 hypervisor, or with only a single memory controller.
287 It is recommended that this option always be enabled.
290 int "Log base 2 of the max number of memory controllers"
292 depends on NEED_MULTIPLE_NODES
294 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
295 In a system with more controllers, this value should be raised.
299 prompt "Memory split" if EXPERT
302 Select the desired split between kernel and user memory.
304 If the address range available to the kernel is less than the
305 physical memory installed, the remaining memory will be available
306 as "high memory". Accessing high memory is a little more costly
307 than low memory, as it needs to be mapped into the kernel first.
308 Note that increasing the kernel address space limits the range
309 available to user programs, making the address space there
310 tighter. Selecting anything other than the default 3G/1G split
311 will also likely make your kernel incompatible with binary-only
314 If you are not absolutely sure what you are doing, leave this
318 bool "3.75G/0.25G user/kernel split (no kernel networking)"
320 bool "3.5G/0.5G user/kernel split"
322 bool "3G/1G user/kernel split"
324 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
326 bool "2.5G/1.5G user/kernel split"
328 bool "2.25G/1.75G user/kernel split"
330 bool "2G/2G user/kernel split"
332 bool "1G/3G user/kernel split"
338 default 0xF0000000 if VMSPLIT_3_75G
339 default 0xE0000000 if VMSPLIT_3_5G
340 default 0xB0000000 if VMSPLIT_2_75G
341 default 0xA0000000 if VMSPLIT_2_5G
342 default 0x90000000 if VMSPLIT_2_25G
343 default 0x80000000 if VMSPLIT_2G
344 default 0x40000000 if VMSPLIT_1G
349 source "kernel/Kconfig.preempt"
352 bool "Built-in kernel command line"
355 Allow for specifying boot arguments to the kernel at
356 build time. On some systems (e.g. embedded ones), it is
357 necessary or convenient to provide some or all of the
358 kernel boot arguments with the kernel itself (that is,
359 to not rely on the boot loader to provide them.)
361 To compile command line arguments into the kernel,
362 set this option to 'Y', then fill in the
363 the boot arguments in CONFIG_CMDLINE.
365 Systems with fully functional boot loaders (e.g. mboot, or
366 if booting over PCI) should leave this option set to 'N'.
369 string "Built-in kernel command string"
370 depends on CMDLINE_BOOL
373 Enter arguments here that should be compiled into the kernel
374 image and used at boot time. If the boot loader provides a
375 command line at boot time, it is appended to this string to
376 form the full kernel command line, when the system boots.
378 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
379 change this behavior.
381 In most cases, the command line (whether built-in or provided
382 by the boot loader) should specify the device for the root
385 config CMDLINE_OVERRIDE
386 bool "Built-in command line overrides boot loader arguments"
388 depends on CMDLINE_BOOL
390 Set this option to 'Y' to have the kernel ignore the boot loader
391 command line, and use ONLY the built-in command line.
393 This is used to work around broken boot loaders. This should
394 be set to 'N' under normal conditions.
396 config VMALLOC_RESERVE
401 bool "Hardwall support to allow access to user dynamic network"
405 int "Processor protection level for kernel"
410 Since MDE 4.2, the Tilera hypervisor runs the kernel
411 at PL2 by default. If running under an older hypervisor,
412 or as a KVM guest, you must run at PL1. (The current
413 hypervisor may also be recompiled with "make HV_PL=2" to
414 allow it to run a kernel at PL1, but clients running at PL1
415 are not expected to be supported indefinitely.)
417 If you're not sure, don't change the default.
419 source "arch/tile/gxio/Kconfig"
421 endmenu # Tilera-specific configuration
429 select GENERIC_PCI_IOMAP
430 select TILE_GXIO_TRIO if TILEGX
431 select PCI_MSI if TILEGX
433 Enable PCI root complex support, so PCIe endpoint devices can
434 be attached to the Tile chip. Many, but not all, PCI devices
435 are supported under Tilera's root complex driver.
447 bool "PCI I/O space support"
452 Enable PCI I/O space support on TILEGx. Since the PCI I/O space
453 is used by few modern PCIe endpoint devices, its support is disabled
454 by default to save the TRIO PIO Region resource for other purposes.
456 source "drivers/pci/Kconfig"
458 source "drivers/pci/pcie/Kconfig"
461 tristate "Tilera USB host adapter support"
465 select TILE_GXIO_USB_HOST
467 Provides USB host adapter support for the built-in EHCI and OHCI
468 interfaces on TILE-Gx chips.
470 source "drivers/pci/hotplug/Kconfig"
474 menu "Executable file formats"
476 source "fs/Kconfig.binfmt"
482 source "drivers/Kconfig"
486 source "arch/tile/Kconfig.debug"
488 source "security/Kconfig"
490 source "crypto/Kconfig"
494 source "arch/tile/kvm/Kconfig"