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_HAS_DEVMEM_IS_ALLOWED
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
120 # SMP is required for Tilera Linux.
127 select HVC_IRQ if TILEGX
130 # Building with ARCH=tilegx (or ARCH=tile) implies using the
131 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
133 def_bool ARCH != "tilepro"
135 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
136 select HAVE_FUNCTION_TRACER
137 select HAVE_FUNCTION_GRAPH_TRACER
138 select HAVE_DYNAMIC_FTRACE
139 select HAVE_FTRACE_MCOUNT_RECORD
141 select HAVE_KRETPROBES
142 select HAVE_ARCH_KGDB
143 select ARCH_SUPPORTS_ATOMIC_RMW
144 select HAVE_ARCH_JUMP_LABEL
152 config ARCH_DEFCONFIG
154 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
155 default "arch/tile/configs/tilegx_defconfig" if TILEGX
157 config PGTABLE_LEVELS
162 source "init/Kconfig"
164 source "kernel/Kconfig.freezer"
166 menu "Tilera-specific configuration"
169 int "Maximum number of tiles (2-255)"
174 Building with 64 is the recommended value, but a slightly
175 smaller kernel memory footprint results from using a smaller
176 value on chips with fewer tiles.
179 prompt "Kernel page size"
180 default PAGE_SIZE_64KB
182 This lets you select the page size of the kernel. For best
183 performance on memory-intensive applications, a page size of 64KB
184 is recommended. For workloads involving many small files, many
185 connections, etc., it may be better to select 16KB, which uses
186 memory more efficiently at some cost in TLB performance.
188 Note that for TILEPro, you must also rebuild the hypervisor
189 with a matching page size.
192 bool "4KB" if TILEPRO
194 config PAGE_SIZE_16KB
197 config PAGE_SIZE_64KB
202 source "kernel/Kconfig.hz"
205 bool "kexec system call"
208 kexec is a system call that implements the ability to shutdown your
209 current kernel, and to start another kernel. It is like a reboot
210 but it is independent of the system firmware. It is used
211 to implement the "mboot" Tilera booter.
213 The name comes from the similarity to the exec system call.
216 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
218 select COMPAT_BINFMT_ELF
221 If enabled, the kernel will support running TILE-Gx binaries
222 that were built with the -m32 option.
225 bool "Enable seccomp to safely compute untrusted bytecode"
228 This kernel feature is useful for number crunching applications
229 that may need to compute untrusted bytecode during their
230 execution. By using pipes or other transports made available to
231 the process as file descriptors supporting the read/write
232 syscalls, it's possible to isolate those applications in
233 their own address space using seccomp. Once seccomp is
234 enabled via prctl, it cannot be disabled and the task is only
235 allowed to execute a few safe syscalls defined by each seccomp
240 config SYSVIPC_COMPAT
242 depends on COMPAT && SYSVIPC
244 # We do not currently support disabling HIGHMEM on tilepro.
246 bool # "Support for more than 512 MB of RAM"
249 Linux can use the full amount of RAM in the system by
250 default. However, the address space of TILE processors is
251 only 4 Gigabytes large. That means that, if you have a large
252 amount of physical memory, not all of it can be "permanently
253 mapped" by the kernel. The physical memory that's not
254 permanently mapped is called "high memory".
256 If you are compiling a kernel which will never run on a
257 machine with more than 512 MB total physical RAM, answer
258 "false" here. This will result in the kernel mapping all of
259 physical memory into the top 1 GB of virtual memory space.
261 If unsure, say "true".
269 config NEED_SG_DMA_LENGTH
276 select NEED_SG_DMA_LENGTH
277 select ARCH_HAS_DMA_SET_COHERENT_MASK
279 # We do not currently support disabling NUMA.
281 bool # "NUMA Memory Allocation and Scheduler Support"
282 depends on SMP && DISCONTIGMEM
285 NUMA memory allocation is required for TILE processors
286 unless booting with memory striping enabled in the
287 hypervisor, or with only a single memory controller.
288 It is recommended that this option always be enabled.
291 int "Log base 2 of the max number of memory controllers"
293 depends on NEED_MULTIPLE_NODES
295 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
296 In a system with more controllers, this value should be raised.
300 prompt "Memory split" if EXPERT
303 Select the desired split between kernel and user memory.
305 If the address range available to the kernel is less than the
306 physical memory installed, the remaining memory will be available
307 as "high memory". Accessing high memory is a little more costly
308 than low memory, as it needs to be mapped into the kernel first.
309 Note that increasing the kernel address space limits the range
310 available to user programs, making the address space there
311 tighter. Selecting anything other than the default 3G/1G split
312 will also likely make your kernel incompatible with binary-only
315 If you are not absolutely sure what you are doing, leave this
319 bool "3.75G/0.25G user/kernel split (no kernel networking)"
321 bool "3.5G/0.5G user/kernel split"
323 bool "3G/1G user/kernel split"
325 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
327 bool "2.5G/1.5G user/kernel split"
329 bool "2.25G/1.75G user/kernel split"
331 bool "2G/2G user/kernel split"
333 bool "1G/3G user/kernel split"
339 default 0xF0000000 if VMSPLIT_3_75G
340 default 0xE0000000 if VMSPLIT_3_5G
341 default 0xB0000000 if VMSPLIT_2_75G
342 default 0xA0000000 if VMSPLIT_2_5G
343 default 0x90000000 if VMSPLIT_2_25G
344 default 0x80000000 if VMSPLIT_2G
345 default 0x40000000 if VMSPLIT_1G
350 source "kernel/Kconfig.preempt"
353 bool "Built-in kernel command line"
356 Allow for specifying boot arguments to the kernel at
357 build time. On some systems (e.g. embedded ones), it is
358 necessary or convenient to provide some or all of the
359 kernel boot arguments with the kernel itself (that is,
360 to not rely on the boot loader to provide them.)
362 To compile command line arguments into the kernel,
363 set this option to 'Y', then fill in the
364 the boot arguments in CONFIG_CMDLINE.
366 Systems with fully functional boot loaders (e.g. mboot, or
367 if booting over PCI) should leave this option set to 'N'.
370 string "Built-in kernel command string"
371 depends on CMDLINE_BOOL
374 Enter arguments here that should be compiled into the kernel
375 image and used at boot time. If the boot loader provides a
376 command line at boot time, it is appended to this string to
377 form the full kernel command line, when the system boots.
379 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
380 change this behavior.
382 In most cases, the command line (whether built-in or provided
383 by the boot loader) should specify the device for the root
386 config CMDLINE_OVERRIDE
387 bool "Built-in command line overrides boot loader arguments"
389 depends on CMDLINE_BOOL
391 Set this option to 'Y' to have the kernel ignore the boot loader
392 command line, and use ONLY the built-in command line.
394 This is used to work around broken boot loaders. This should
395 be set to 'N' under normal conditions.
397 config VMALLOC_RESERVE
402 bool "Hardwall support to allow access to user dynamic network"
406 int "Processor protection level for kernel"
411 Since MDE 4.2, the Tilera hypervisor runs the kernel
412 at PL2 by default. If running under an older hypervisor,
413 or as a KVM guest, you must run at PL1. (The current
414 hypervisor may also be recompiled with "make HV_PL=2" to
415 allow it to run a kernel at PL1, but clients running at PL1
416 are not expected to be supported indefinitely.)
418 If you're not sure, don't change the default.
420 source "arch/tile/gxio/Kconfig"
422 endmenu # Tilera-specific configuration
430 select GENERIC_PCI_IOMAP
431 select TILE_GXIO_TRIO if TILEGX
432 select PCI_MSI if TILEGX
434 Enable PCI root complex support, so PCIe endpoint devices can
435 be attached to the Tile chip. Many, but not all, PCI devices
436 are supported under Tilera's root complex driver.
448 bool "PCI I/O space support"
453 Enable PCI I/O space support on TILEGx. Since the PCI I/O space
454 is used by few modern PCIe endpoint devices, its support is disabled
455 by default to save the TRIO PIO Region resource for other purposes.
457 source "drivers/pci/Kconfig"
459 source "drivers/pci/pcie/Kconfig"
462 tristate "Tilera USB host adapter support"
466 select TILE_GXIO_USB_HOST
468 Provides USB host adapter support for the built-in EHCI and OHCI
469 interfaces on TILE-Gx chips.
471 source "drivers/pci/hotplug/Kconfig"
475 menu "Executable file formats"
477 source "fs/Kconfig.binfmt"
483 source "drivers/Kconfig"
487 source "arch/tile/Kconfig.debug"
489 source "security/Kconfig"
491 source "crypto/Kconfig"
495 source "arch/tile/kvm/Kconfig"