1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
7 select HAVE_DMA_API_DEBUG
8 select HAVE_KVM if !TILEGX
9 select GENERIC_FIND_FIRST_BIT
10 select SYSCTL_EXCEPTION_TRACE
11 select USE_GENERIC_SMP_HELPERS
12 select CC_OPTIMIZE_FOR_SIZE
13 select HAVE_DEBUG_KMEMLEAK
14 select HAVE_GENERIC_HARDIRQS
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_HAVE_NMI_SAFE_CMPXCHG
22 select GENERIC_CLOCKEVENTS
23 select MODULES_USE_ELF_RELA
24 select HAVE_ARCH_TRACEHOOK
25 select HAVE_SYSCALL_TRACEPOINTS
26 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
28 # FIXME: investigate whether we need/want these options.
29 # select HAVE_IOREMAP_PROT
30 # select HAVE_OPTPROBES
31 # select HAVE_REGS_AND_STACK_ACCESS_API
32 # select HAVE_HW_BREAKPOINT
34 # select HAVE_USER_RETURN_NOTIFIER
36 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
37 # config HUGETLB_PAGE_SIZE_VARIABLE
45 config SEMAPHORE_SLEEPERS
48 config HAVE_ARCH_ALLOC_REMAP
51 config HAVE_SETUP_PER_CPU_AREA
54 config NEED_PER_CPU_PAGE_FIRST_CHUNK
57 config SYS_SUPPORTS_HUGETLBFS
60 # Support for additional huge page sizes besides HPAGE_SIZE.
61 # The software support is currently only present in the TILE-Gx
62 # hypervisor. TILEPro in any case does not support page sizes
63 # larger than the default HPAGE_SIZE.
64 config HUGETLB_SUPER_PAGES
65 depends on HUGETLB_PAGE && TILEGX
68 # FIXME: tilegx can implement a more efficient rwsem.
69 config RWSEM_GENERIC_SPINLOCK
72 # We have a very flat architecture from a migration point of view,
73 # so save boot time by presetting this (particularly useful on tile-sim).
74 config DEFAULT_MIGRATION_COST
78 # We only support gcc 4.4 and above, so this should work.
79 config ARCH_SUPPORTS_OPTIMIZED_INLINING
82 config ARCH_PHYS_ADDR_T_64BIT
85 config ARCH_DMA_ADDR_T_64BIT
88 config NEED_DMA_MAP_STATE
91 config ARCH_HAS_DMA_SET_COHERENT_MASK
94 config LOCKDEP_SUPPORT
97 config STACKTRACE_SUPPORT
101 # We use discontigmem for now; at some point we may want to switch
102 # to sparsemem (Tilera bug 7996).
103 config ARCH_DISCONTIGMEM_ENABLE
106 config ARCH_DISCONTIGMEM_DEFAULT
109 config TRACE_IRQFLAGS_SUPPORT
115 # SMP is required for Tilera Linux.
119 # Allow checking for compile-time determined overflow errors in
120 # copy_from_user(). There are still unprovable places in the
121 # generic code as of 2.6.34, so this option is not really compatible
122 # with -Werror, which is more useful in general.
123 config DEBUG_COPY_FROM_USER
132 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
140 config ARCH_DEFCONFIG
142 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
143 default "arch/tile/configs/tilegx_defconfig" if TILEGX
145 source "init/Kconfig"
147 source "kernel/Kconfig.freezer"
149 menu "Tilera-specific configuration"
152 int "Maximum number of tiles (2-255)"
157 Building with 64 is the recommended value, but a slightly
158 smaller kernel memory footprint results from using a smaller
159 value on chips with fewer tiles.
164 prompt "Kernel page size"
165 default PAGE_SIZE_64KB
167 This lets you select the page size of the kernel. For best
168 performance on memory-intensive applications, a page size of 64KB
169 is recommended. For workloads involving many small files, many
170 connections, etc., it may be better to select 16KB, which uses
171 memory more efficiently at some cost in TLB performance.
173 Note that this option is TILE-Gx specific; currently
174 TILEPro page size is set by rebuilding the hypervisor.
176 config PAGE_SIZE_16KB
179 config PAGE_SIZE_64KB
186 source "kernel/Kconfig.hz"
189 bool "kexec system call"
191 kexec is a system call that implements the ability to shutdown your
192 current kernel, and to start another kernel. It is like a reboot
193 but it is independent of the system firmware. It is used
194 to implement the "mboot" Tilera booter.
196 The name comes from the similarity to the exec system call.
199 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
201 select COMPAT_BINFMT_ELF
204 If enabled, the kernel will support running TILE-Gx binaries
205 that were built with the -m32 option.
207 config SYSVIPC_COMPAT
209 depends on COMPAT && SYSVIPC
211 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
213 bool # "Support for more than 512 MB of RAM"
216 Linux can use the full amount of RAM in the system by
217 default. However, the address space of TILE processors is
218 only 4 Gigabytes large. That means that, if you have a large
219 amount of physical memory, not all of it can be "permanently
220 mapped" by the kernel. The physical memory that's not
221 permanently mapped is called "high memory".
223 If you are compiling a kernel which will never run on a
224 machine with more than 512 MB total physical RAM, answer
225 "false" here. This will result in the kernel mapping all of
226 physical memory into the top 1 GB of virtual memory space.
228 If unsure, say "true".
236 config NEED_SG_DMA_LENGTH
243 select NEED_SG_DMA_LENGTH
244 select ARCH_HAS_DMA_SET_COHERENT_MASK
246 # We do not currently support disabling NUMA.
248 bool # "NUMA Memory Allocation and Scheduler Support"
249 depends on SMP && DISCONTIGMEM
252 NUMA memory allocation is required for TILE processors
253 unless booting with memory striping enabled in the
254 hypervisor, or with only a single memory controller.
255 It is recommended that this option always be enabled.
258 int "Log base 2 of the max number of memory controllers"
260 depends on NEED_MULTIPLE_NODES
262 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
263 In a system with more controllers, this value should be raised.
267 prompt "Memory split" if EXPERT
270 Select the desired split between kernel and user memory.
272 If the address range available to the kernel is less than the
273 physical memory installed, the remaining memory will be available
274 as "high memory". Accessing high memory is a little more costly
275 than low memory, as it needs to be mapped into the kernel first.
276 Note that increasing the kernel address space limits the range
277 available to user programs, making the address space there
278 tighter. Selecting anything other than the default 3G/1G split
279 will also likely make your kernel incompatible with binary-only
282 If you are not absolutely sure what you are doing, leave this
286 bool "3.75G/0.25G user/kernel split (no kernel networking)"
288 bool "3.5G/0.5G user/kernel split"
290 bool "3G/1G user/kernel split"
292 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
294 bool "2.5G/1.5G user/kernel split"
296 bool "2.25G/1.75G user/kernel split"
298 bool "2G/2G user/kernel split"
300 bool "1G/3G user/kernel split"
306 default 0xF0000000 if VMSPLIT_3_75G
307 default 0xE0000000 if VMSPLIT_3_5G
308 default 0xB0000000 if VMSPLIT_2_75G
309 default 0xA0000000 if VMSPLIT_2_5G
310 default 0x90000000 if VMSPLIT_2_25G
311 default 0x80000000 if VMSPLIT_2G
312 default 0x40000000 if VMSPLIT_1G
318 bool "Built-in kernel command line"
321 Allow for specifying boot arguments to the kernel at
322 build time. On some systems (e.g. embedded ones), it is
323 necessary or convenient to provide some or all of the
324 kernel boot arguments with the kernel itself (that is,
325 to not rely on the boot loader to provide them.)
327 To compile command line arguments into the kernel,
328 set this option to 'Y', then fill in the
329 the boot arguments in CONFIG_CMDLINE.
331 Systems with fully functional boot loaders (e.g. mboot, or
332 if booting over PCI) should leave this option set to 'N'.
335 string "Built-in kernel command string"
336 depends on CMDLINE_BOOL
339 Enter arguments here that should be compiled into the kernel
340 image and used at boot time. If the boot loader provides a
341 command line at boot time, it is appended to this string to
342 form the full kernel command line, when the system boots.
344 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
345 change this behavior.
347 In most cases, the command line (whether built-in or provided
348 by the boot loader) should specify the device for the root
351 config CMDLINE_OVERRIDE
352 bool "Built-in command line overrides boot loader arguments"
354 depends on CMDLINE_BOOL
356 Set this option to 'Y' to have the kernel ignore the boot loader
357 command line, and use ONLY the built-in command line.
359 This is used to work around broken boot loaders. This should
360 be set to 'N' under normal conditions.
362 config VMALLOC_RESERVE
367 bool "Hardwall support to allow access to user dynamic network"
371 int "Processor protection level for kernel"
375 This setting determines the processor protection level the
376 kernel will be built to run at. Generally you should use
377 the default value here.
379 source "arch/tile/gxio/Kconfig"
381 endmenu # Tilera-specific configuration
389 select GENERIC_PCI_IOMAP
390 select TILE_GXIO_TRIO if TILEGX
391 select ARCH_SUPPORTS_MSI if TILEGX
392 select PCI_MSI if TILEGX
394 Enable PCI root complex support, so PCIe endpoint devices can
395 be attached to the Tile chip. Many, but not all, PCI devices
396 are supported under Tilera's root complex driver.
407 source "drivers/pci/Kconfig"
410 tristate "Tilera USB host adapter support"
414 select TILE_GXIO_USB_HOST
416 Provides USB host adapter support for the built-in EHCI and OHCI
417 interfaces on TILE-Gx chips.
419 source "drivers/pci/hotplug/Kconfig"
423 menu "Executable file formats"
430 source "fs/Kconfig.binfmt"
436 source "drivers/Kconfig"
440 source "arch/tile/Kconfig.debug"
442 source "security/Kconfig"
444 source "crypto/Kconfig"
448 source "arch/tile/kvm/Kconfig"