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
19 select HAVE_SYSCALL_WRAPPERS if TILEGX
21 select ARCH_HAVE_NMI_SAFE_CMPXCHG
22 select GENERIC_CLOCKEVENTS
23 select MODULES_USE_ELF_RELA
25 # FIXME: investigate whether we need/want these options.
26 # select HAVE_IOREMAP_PROT
27 # select HAVE_OPTPROBES
28 # select HAVE_REGS_AND_STACK_ACCESS_API
29 # select HAVE_HW_BREAKPOINT
31 # select HAVE_USER_RETURN_NOTIFIER
33 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
34 # config HUGETLB_PAGE_SIZE_VARIABLE
42 config SEMAPHORE_SLEEPERS
45 config HAVE_ARCH_ALLOC_REMAP
48 config HAVE_SETUP_PER_CPU_AREA
51 config NEED_PER_CPU_PAGE_FIRST_CHUNK
54 config SYS_SUPPORTS_HUGETLBFS
57 # Support for additional huge page sizes besides HPAGE_SIZE.
58 # The software support is currently only present in the TILE-Gx
59 # hypervisor. TILEPro in any case does not support page sizes
60 # larger than the default HPAGE_SIZE.
61 config HUGETLB_SUPER_PAGES
62 depends on HUGETLB_PAGE && TILEGX
65 # FIXME: tilegx can implement a more efficient rwsem.
66 config RWSEM_GENERIC_SPINLOCK
69 # We have a very flat architecture from a migration point of view,
70 # so save boot time by presetting this (particularly useful on tile-sim).
71 config DEFAULT_MIGRATION_COST
75 # We only support gcc 4.4 and above, so this should work.
76 config ARCH_SUPPORTS_OPTIMIZED_INLINING
79 config ARCH_PHYS_ADDR_T_64BIT
82 config ARCH_DMA_ADDR_T_64BIT
85 config NEED_DMA_MAP_STATE
88 config ARCH_HAS_DMA_SET_COHERENT_MASK
91 config LOCKDEP_SUPPORT
94 config STACKTRACE_SUPPORT
98 # We use discontigmem for now; at some point we may want to switch
99 # to sparsemem (Tilera bug 7996).
100 config ARCH_DISCONTIGMEM_ENABLE
103 config ARCH_DISCONTIGMEM_DEFAULT
106 config TRACE_IRQFLAGS_SUPPORT
112 # SMP is required for Tilera Linux.
116 # Allow checking for compile-time determined overflow errors in
117 # copy_from_user(). There are still unprovable places in the
118 # generic code as of 2.6.34, so this option is not really compatible
119 # with -Werror, which is more useful in general.
120 config DEBUG_COPY_FROM_USER
128 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
136 config ARCH_DEFCONFIG
138 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
139 default "arch/tile/configs/tilegx_defconfig" if TILEGX
141 source "init/Kconfig"
143 menu "Tilera-specific configuration"
146 int "Maximum number of tiles (2-255)"
151 Building with 64 is the recommended value, but a slightly
152 smaller kernel memory footprint results from using a smaller
153 value on chips with fewer tiles.
158 prompt "Kernel page size"
159 default PAGE_SIZE_64KB
161 This lets you select the page size of the kernel. For best
162 performance on memory-intensive applications, a page size of 64KB
163 is recommended. For workloads involving many small files, many
164 connections, etc., it may be better to select 16KB, which uses
165 memory more efficiently at some cost in TLB performance.
167 Note that this option is TILE-Gx specific; currently
168 TILEPro page size is set by rebuilding the hypervisor.
170 config PAGE_SIZE_16KB
173 config PAGE_SIZE_64KB
180 source "kernel/Kconfig.hz"
183 bool "kexec system call"
185 kexec is a system call that implements the ability to shutdown your
186 current kernel, and to start another kernel. It is like a reboot
187 but it is independent of the system firmware. It is used
188 to implement the "mboot" Tilera booter.
190 The name comes from the similarity to the exec system call.
193 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
195 select COMPAT_BINFMT_ELF
198 If enabled, the kernel will support running TILE-Gx binaries
199 that were built with the -m32 option.
201 config SYSVIPC_COMPAT
203 depends on COMPAT && SYSVIPC
205 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
207 bool # "Support for more than 512 MB of RAM"
210 Linux can use the full amount of RAM in the system by
211 default. However, the address space of TILE processors is
212 only 4 Gigabytes large. That means that, if you have a large
213 amount of physical memory, not all of it can be "permanently
214 mapped" by the kernel. The physical memory that's not
215 permanently mapped is called "high memory".
217 If you are compiling a kernel which will never run on a
218 machine with more than 512 MB total physical RAM, answer
219 "false" here. This will result in the kernel mapping all of
220 physical memory into the top 1 GB of virtual memory space.
222 If unsure, say "true".
230 config NEED_SG_DMA_LENGTH
237 select NEED_SG_DMA_LENGTH
238 select ARCH_HAS_DMA_SET_COHERENT_MASK
240 # We do not currently support disabling NUMA.
242 bool # "NUMA Memory Allocation and Scheduler Support"
243 depends on SMP && DISCONTIGMEM
246 NUMA memory allocation is required for TILE processors
247 unless booting with memory striping enabled in the
248 hypervisor, or with only a single memory controller.
249 It is recommended that this option always be enabled.
252 int "Log base 2 of the max number of memory controllers"
254 depends on NEED_MULTIPLE_NODES
256 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
257 In a system with more controllers, this value should be raised.
261 prompt "Memory split" if EXPERT
264 Select the desired split between kernel and user memory.
266 If the address range available to the kernel is less than the
267 physical memory installed, the remaining memory will be available
268 as "high memory". Accessing high memory is a little more costly
269 than low memory, as it needs to be mapped into the kernel first.
270 Note that increasing the kernel address space limits the range
271 available to user programs, making the address space there
272 tighter. Selecting anything other than the default 3G/1G split
273 will also likely make your kernel incompatible with binary-only
276 If you are not absolutely sure what you are doing, leave this
280 bool "3.75G/0.25G user/kernel split (no kernel networking)"
282 bool "3.5G/0.5G user/kernel split"
284 bool "3G/1G user/kernel split"
286 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
288 bool "2.5G/1.5G user/kernel split"
290 bool "2.25G/1.75G user/kernel split"
292 bool "2G/2G user/kernel split"
294 bool "1G/3G user/kernel split"
300 default 0xF0000000 if VMSPLIT_3_75G
301 default 0xE0000000 if VMSPLIT_3_5G
302 default 0xB0000000 if VMSPLIT_2_75G
303 default 0xA0000000 if VMSPLIT_2_5G
304 default 0x90000000 if VMSPLIT_2_25G
305 default 0x80000000 if VMSPLIT_2G
306 default 0x40000000 if VMSPLIT_1G
312 bool "Built-in kernel command line"
315 Allow for specifying boot arguments to the kernel at
316 build time. On some systems (e.g. embedded ones), it is
317 necessary or convenient to provide some or all of the
318 kernel boot arguments with the kernel itself (that is,
319 to not rely on the boot loader to provide them.)
321 To compile command line arguments into the kernel,
322 set this option to 'Y', then fill in the
323 the boot arguments in CONFIG_CMDLINE.
325 Systems with fully functional boot loaders (e.g. mboot, or
326 if booting over PCI) should leave this option set to 'N'.
329 string "Built-in kernel command string"
330 depends on CMDLINE_BOOL
333 Enter arguments here that should be compiled into the kernel
334 image and used at boot time. If the boot loader provides a
335 command line at boot time, it is appended to this string to
336 form the full kernel command line, when the system boots.
338 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
339 change this behavior.
341 In most cases, the command line (whether built-in or provided
342 by the boot loader) should specify the device for the root
345 config CMDLINE_OVERRIDE
346 bool "Built-in command line overrides boot loader arguments"
348 depends on CMDLINE_BOOL
350 Set this option to 'Y' to have the kernel ignore the boot loader
351 command line, and use ONLY the built-in command line.
353 This is used to work around broken boot loaders. This should
354 be set to 'N' under normal conditions.
356 config VMALLOC_RESERVE
361 bool "Hardwall support to allow access to user dynamic network"
365 int "Processor protection level for kernel"
369 This setting determines the processor protection level the
370 kernel will be built to run at. Generally you should use
371 the default value here.
373 source "arch/tile/gxio/Kconfig"
375 endmenu # Tilera-specific configuration
383 select GENERIC_PCI_IOMAP
384 select TILE_GXIO_TRIO if TILEGX
385 select ARCH_SUPPORTS_MSI if TILEGX
386 select PCI_MSI if TILEGX
388 Enable PCI root complex support, so PCIe endpoint devices can
389 be attached to the Tile chip. Many, but not all, PCI devices
390 are supported under Tilera's root complex driver.
401 source "drivers/pci/Kconfig"
404 tristate "Tilera USB host adapter support"
408 select TILE_GXIO_USB_HOST
410 Provides USB host adapter support for the built-in EHCI and OHCI
411 interfaces on TILE-Gx chips.
413 # USB OHCI needs the bounce pool since tilegx will often have more
414 # than 4GB of memory, but we don't currently use the IOTLB to present
415 # a 32-bit address to OHCI. So we need to use a bounce pool instead.
416 config NEED_BOUNCE_POOL
417 def_bool USB_OHCI_HCD
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"