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
22 select ARCH_HAVE_NMI_SAFE_CMPXCHG
23 select GENERIC_CLOCKEVENTS
24 select MODULES_USE_ELF_RELA
26 # FIXME: investigate whether we need/want these options.
27 # select HAVE_IOREMAP_PROT
28 # select HAVE_OPTPROBES
29 # select HAVE_REGS_AND_STACK_ACCESS_API
30 # select HAVE_HW_BREAKPOINT
32 # select HAVE_USER_RETURN_NOTIFIER
34 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
35 # config HUGETLB_PAGE_SIZE_VARIABLE
43 config SEMAPHORE_SLEEPERS
46 config HAVE_ARCH_ALLOC_REMAP
49 config HAVE_SETUP_PER_CPU_AREA
52 config NEED_PER_CPU_PAGE_FIRST_CHUNK
55 config SYS_SUPPORTS_HUGETLBFS
58 # Support for additional huge page sizes besides HPAGE_SIZE.
59 # The software support is currently only present in the TILE-Gx
60 # hypervisor. TILEPro in any case does not support page sizes
61 # larger than the default HPAGE_SIZE.
62 config HUGETLB_SUPER_PAGES
63 depends on HUGETLB_PAGE && TILEGX
66 # FIXME: tilegx can implement a more efficient rwsem.
67 config RWSEM_GENERIC_SPINLOCK
70 # We have a very flat architecture from a migration point of view,
71 # so save boot time by presetting this (particularly useful on tile-sim).
72 config DEFAULT_MIGRATION_COST
76 # We only support gcc 4.4 and above, so this should work.
77 config ARCH_SUPPORTS_OPTIMIZED_INLINING
80 config ARCH_PHYS_ADDR_T_64BIT
83 config ARCH_DMA_ADDR_T_64BIT
86 config NEED_DMA_MAP_STATE
89 config ARCH_HAS_DMA_SET_COHERENT_MASK
92 config LOCKDEP_SUPPORT
95 config STACKTRACE_SUPPORT
99 # We use discontigmem for now; at some point we may want to switch
100 # to sparsemem (Tilera bug 7996).
101 config ARCH_DISCONTIGMEM_ENABLE
104 config ARCH_DISCONTIGMEM_DEFAULT
107 config TRACE_IRQFLAGS_SUPPORT
113 # SMP is required for Tilera Linux.
117 # Allow checking for compile-time determined overflow errors in
118 # copy_from_user(). There are still unprovable places in the
119 # generic code as of 2.6.34, so this option is not really compatible
120 # with -Werror, which is more useful in general.
121 config DEBUG_COPY_FROM_USER
130 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
138 config ARCH_DEFCONFIG
140 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
141 default "arch/tile/configs/tilegx_defconfig" if TILEGX
143 source "init/Kconfig"
145 source "kernel/Kconfig.freezer"
147 menu "Tilera-specific configuration"
150 int "Maximum number of tiles (2-255)"
155 Building with 64 is the recommended value, but a slightly
156 smaller kernel memory footprint results from using a smaller
157 value on chips with fewer tiles.
162 prompt "Kernel page size"
163 default PAGE_SIZE_64KB
165 This lets you select the page size of the kernel. For best
166 performance on memory-intensive applications, a page size of 64KB
167 is recommended. For workloads involving many small files, many
168 connections, etc., it may be better to select 16KB, which uses
169 memory more efficiently at some cost in TLB performance.
171 Note that this option is TILE-Gx specific; currently
172 TILEPro page size is set by rebuilding the hypervisor.
174 config PAGE_SIZE_16KB
177 config PAGE_SIZE_64KB
184 source "kernel/Kconfig.hz"
187 bool "kexec system call"
189 kexec is a system call that implements the ability to shutdown your
190 current kernel, and to start another kernel. It is like a reboot
191 but it is independent of the system firmware. It is used
192 to implement the "mboot" Tilera booter.
194 The name comes from the similarity to the exec system call.
197 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
199 select COMPAT_BINFMT_ELF
202 If enabled, the kernel will support running TILE-Gx binaries
203 that were built with the -m32 option.
205 config SYSVIPC_COMPAT
207 depends on COMPAT && SYSVIPC
209 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
211 bool # "Support for more than 512 MB of RAM"
214 Linux can use the full amount of RAM in the system by
215 default. However, the address space of TILE processors is
216 only 4 Gigabytes large. That means that, if you have a large
217 amount of physical memory, not all of it can be "permanently
218 mapped" by the kernel. The physical memory that's not
219 permanently mapped is called "high memory".
221 If you are compiling a kernel which will never run on a
222 machine with more than 512 MB total physical RAM, answer
223 "false" here. This will result in the kernel mapping all of
224 physical memory into the top 1 GB of virtual memory space.
226 If unsure, say "true".
234 config NEED_SG_DMA_LENGTH
241 select NEED_SG_DMA_LENGTH
242 select ARCH_HAS_DMA_SET_COHERENT_MASK
244 # We do not currently support disabling NUMA.
246 bool # "NUMA Memory Allocation and Scheduler Support"
247 depends on SMP && DISCONTIGMEM
250 NUMA memory allocation is required for TILE processors
251 unless booting with memory striping enabled in the
252 hypervisor, or with only a single memory controller.
253 It is recommended that this option always be enabled.
256 int "Log base 2 of the max number of memory controllers"
258 depends on NEED_MULTIPLE_NODES
260 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
261 In a system with more controllers, this value should be raised.
265 prompt "Memory split" if EXPERT
268 Select the desired split between kernel and user memory.
270 If the address range available to the kernel is less than the
271 physical memory installed, the remaining memory will be available
272 as "high memory". Accessing high memory is a little more costly
273 than low memory, as it needs to be mapped into the kernel first.
274 Note that increasing the kernel address space limits the range
275 available to user programs, making the address space there
276 tighter. Selecting anything other than the default 3G/1G split
277 will also likely make your kernel incompatible with binary-only
280 If you are not absolutely sure what you are doing, leave this
284 bool "3.75G/0.25G user/kernel split (no kernel networking)"
286 bool "3.5G/0.5G user/kernel split"
288 bool "3G/1G user/kernel split"
290 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
292 bool "2.5G/1.5G user/kernel split"
294 bool "2.25G/1.75G user/kernel split"
296 bool "2G/2G user/kernel split"
298 bool "1G/3G user/kernel split"
304 default 0xF0000000 if VMSPLIT_3_75G
305 default 0xE0000000 if VMSPLIT_3_5G
306 default 0xB0000000 if VMSPLIT_2_75G
307 default 0xA0000000 if VMSPLIT_2_5G
308 default 0x90000000 if VMSPLIT_2_25G
309 default 0x80000000 if VMSPLIT_2G
310 default 0x40000000 if VMSPLIT_1G
316 bool "Built-in kernel command line"
319 Allow for specifying boot arguments to the kernel at
320 build time. On some systems (e.g. embedded ones), it is
321 necessary or convenient to provide some or all of the
322 kernel boot arguments with the kernel itself (that is,
323 to not rely on the boot loader to provide them.)
325 To compile command line arguments into the kernel,
326 set this option to 'Y', then fill in the
327 the boot arguments in CONFIG_CMDLINE.
329 Systems with fully functional boot loaders (e.g. mboot, or
330 if booting over PCI) should leave this option set to 'N'.
333 string "Built-in kernel command string"
334 depends on CMDLINE_BOOL
337 Enter arguments here that should be compiled into the kernel
338 image and used at boot time. If the boot loader provides a
339 command line at boot time, it is appended to this string to
340 form the full kernel command line, when the system boots.
342 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
343 change this behavior.
345 In most cases, the command line (whether built-in or provided
346 by the boot loader) should specify the device for the root
349 config CMDLINE_OVERRIDE
350 bool "Built-in command line overrides boot loader arguments"
352 depends on CMDLINE_BOOL
354 Set this option to 'Y' to have the kernel ignore the boot loader
355 command line, and use ONLY the built-in command line.
357 This is used to work around broken boot loaders. This should
358 be set to 'N' under normal conditions.
360 config VMALLOC_RESERVE
365 bool "Hardwall support to allow access to user dynamic network"
369 int "Processor protection level for kernel"
373 This setting determines the processor protection level the
374 kernel will be built to run at. Generally you should use
375 the default value here.
377 source "arch/tile/gxio/Kconfig"
379 endmenu # Tilera-specific configuration
387 select GENERIC_PCI_IOMAP
388 select TILE_GXIO_TRIO if TILEGX
389 select ARCH_SUPPORTS_MSI if TILEGX
390 select PCI_MSI if TILEGX
392 Enable PCI root complex support, so PCIe endpoint devices can
393 be attached to the Tile chip. Many, but not all, PCI devices
394 are supported under Tilera's root complex driver.
405 source "drivers/pci/Kconfig"
408 tristate "Tilera USB host adapter support"
412 select TILE_GXIO_USB_HOST
414 Provides USB host adapter support for the built-in EHCI and OHCI
415 interfaces on TILE-Gx chips.
417 source "drivers/pci/hotplug/Kconfig"
421 menu "Executable file formats"
428 source "fs/Kconfig.binfmt"
434 source "drivers/Kconfig"
438 source "arch/tile/Kconfig.debug"
440 source "security/Kconfig"
442 source "crypto/Kconfig"
446 source "arch/tile/kvm/Kconfig"