1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
6 select HAVE_KVM if !TILEGX
7 select GENERIC_FIND_FIRST_BIT
8 select USE_GENERIC_SMP_HELPERS
9 select CC_OPTIMIZE_FOR_SIZE
10 select HAVE_GENERIC_HARDIRQS
11 select GENERIC_IRQ_PROBE
12 select GENERIC_PENDING_IRQ if SMP
13 select GENERIC_IRQ_SHOW
14 select HAVE_SYSCALL_WRAPPERS if TILEGX
16 select ARCH_HAVE_NMI_SAFE_CMPXCHG
18 # FIXME: investigate whether we need/want these options.
19 # select HAVE_IOREMAP_PROT
20 # select HAVE_OPTPROBES
21 # select HAVE_REGS_AND_STACK_ACCESS_API
22 # select HAVE_HW_BREAKPOINT
24 # select HAVE_USER_RETURN_NOTIFIER
26 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
27 # config HUGETLB_PAGE_SIZE_VARIABLE
35 config SEMAPHORE_SLEEPERS
38 config HAVE_ARCH_ALLOC_REMAP
41 config HAVE_SETUP_PER_CPU_AREA
44 config NEED_PER_CPU_PAGE_FIRST_CHUNK
47 config SYS_SUPPORTS_HUGETLBFS
50 # Support for additional huge page sizes besides HPAGE_SIZE.
51 # The software support is currently only present in the TILE-Gx
52 # hypervisor. TILEPro in any case does not support page sizes
53 # larger than the default HPAGE_SIZE.
54 config HUGETLB_SUPER_PAGES
55 depends on HUGETLB_PAGE && TILEGX
58 config GENERIC_CLOCKEVENTS
61 # FIXME: tilegx can implement a more efficient rwsem.
62 config RWSEM_GENERIC_SPINLOCK
65 # We have a very flat architecture from a migration point of view,
66 # so save boot time by presetting this (particularly useful on tile-sim).
67 config DEFAULT_MIGRATION_COST
71 # We only support gcc 4.4 and above, so this should work.
72 config ARCH_SUPPORTS_OPTIMIZED_INLINING
75 config ARCH_PHYS_ADDR_T_64BIT
78 config ARCH_DMA_ADDR_T_64BIT
81 config NEED_DMA_MAP_STATE
84 config LOCKDEP_SUPPORT
87 config STACKTRACE_SUPPORT
91 # We use discontigmem for now; at some point we may want to switch
92 # to sparsemem (Tilera bug 7996).
93 config ARCH_DISCONTIGMEM_ENABLE
96 config ARCH_DISCONTIGMEM_DEFAULT
99 config TRACE_IRQFLAGS_SUPPORT
105 # SMP is required for Tilera Linux.
109 # Allow checking for compile-time determined overflow errors in
110 # copy_from_user(). There are still unprovable places in the
111 # generic code as of 2.6.34, so this option is not really compatible
112 # with -Werror, which is more useful in general.
113 config DEBUG_COPY_FROM_USER
120 # Please note: TILE-Gx support is not yet finalized; this is
121 # the preliminary support. TILE-Gx drivers are only provided
122 # with the alpha or beta test versions for Tilera customers.
124 depends on EXPERIMENTAL
125 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
131 config ARCH_DEFCONFIG
133 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
134 default "arch/tile/configs/tilegx_defconfig" if TILEGX
136 source "init/Kconfig"
138 menu "Tilera-specific configuration"
141 int "Maximum number of tiles (2-255)"
146 Building with 64 is the recommended value, but a slightly
147 smaller kernel memory footprint results from using a smaller
148 value on chips with fewer tiles.
153 prompt "Kernel page size"
154 default PAGE_SIZE_64KB
156 This lets you select the page size of the kernel. For best
157 performance on memory-intensive applications, a page size of 64KB
158 is recommended. For workloads involving many small files, many
159 connections, etc., it may be better to select 16KB, which uses
160 memory more efficiently at some cost in TLB performance.
162 Note that this option is TILE-Gx specific; currently
163 TILEPro page size is set by rebuilding the hypervisor.
165 config PAGE_SIZE_16KB
168 config PAGE_SIZE_64KB
175 source "kernel/time/Kconfig"
177 source "kernel/Kconfig.hz"
180 bool "kexec system call"
182 kexec is a system call that implements the ability to shutdown your
183 current kernel, and to start another kernel. It is like a reboot
184 but it is independent of the system firmware. It is used
185 to implement the "mboot" Tilera booter.
187 The name comes from the similarity to the exec system call.
190 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
192 select COMPAT_BINFMT_ELF
195 If enabled, the kernel will support running TILE-Gx binaries
196 that were built with the -m32 option.
198 config SYSVIPC_COMPAT
200 depends on COMPAT && SYSVIPC
202 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
204 bool # "Support for more than 512 MB of RAM"
207 Linux can use the full amount of RAM in the system by
208 default. However, the address space of TILE processors is
209 only 4 Gigabytes large. That means that, if you have a large
210 amount of physical memory, not all of it can be "permanently
211 mapped" by the kernel. The physical memory that's not
212 permanently mapped is called "high memory".
214 If you are compiling a kernel which will never run on a
215 machine with more than 512 MB total physical RAM, answer
216 "false" here. This will result in the kernel mapping all of
217 physical memory into the top 1 GB of virtual memory space.
219 If unsure, say "true".
221 # We do not currently support disabling NUMA.
223 bool # "NUMA Memory Allocation and Scheduler Support"
224 depends on SMP && DISCONTIGMEM
227 NUMA memory allocation is required for TILE processors
228 unless booting with memory striping enabled in the
229 hypervisor, or with only a single memory controller.
230 It is recommended that this option always be enabled.
233 int "Log base 2 of the max number of memory controllers"
235 depends on NEED_MULTIPLE_NODES
237 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
238 In a system with more controllers, this value should be raised.
242 prompt "Memory split" if EXPERT
245 Select the desired split between kernel and user memory.
247 If the address range available to the kernel is less than the
248 physical memory installed, the remaining memory will be available
249 as "high memory". Accessing high memory is a little more costly
250 than low memory, as it needs to be mapped into the kernel first.
251 Note that increasing the kernel address space limits the range
252 available to user programs, making the address space there
253 tighter. Selecting anything other than the default 3G/1G split
254 will also likely make your kernel incompatible with binary-only
257 If you are not absolutely sure what you are doing, leave this
261 bool "3.75G/0.25G user/kernel split (no kernel networking)"
263 bool "3.5G/0.5G user/kernel split"
265 bool "3G/1G user/kernel split"
267 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
269 bool "2.5G/1.5G user/kernel split"
271 bool "2.25G/1.75G user/kernel split"
273 bool "2G/2G user/kernel split"
275 bool "1G/3G user/kernel split"
281 default 0xF0000000 if VMSPLIT_3_75G
282 default 0xE0000000 if VMSPLIT_3_5G
283 default 0xB0000000 if VMSPLIT_2_75G
284 default 0xA0000000 if VMSPLIT_2_5G
285 default 0x90000000 if VMSPLIT_2_25G
286 default 0x80000000 if VMSPLIT_2G
287 default 0x40000000 if VMSPLIT_1G
293 bool "Built-in kernel command line"
296 Allow for specifying boot arguments to the kernel at
297 build time. On some systems (e.g. embedded ones), it is
298 necessary or convenient to provide some or all of the
299 kernel boot arguments with the kernel itself (that is,
300 to not rely on the boot loader to provide them.)
302 To compile command line arguments into the kernel,
303 set this option to 'Y', then fill in the
304 the boot arguments in CONFIG_CMDLINE.
306 Systems with fully functional boot loaders (e.g. mboot, or
307 if booting over PCI) should leave this option set to 'N'.
310 string "Built-in kernel command string"
311 depends on CMDLINE_BOOL
314 Enter arguments here that should be compiled into the kernel
315 image and used at boot time. If the boot loader provides a
316 command line at boot time, it is appended to this string to
317 form the full kernel command line, when the system boots.
319 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
320 change this behavior.
322 In most cases, the command line (whether built-in or provided
323 by the boot loader) should specify the device for the root
326 config CMDLINE_OVERRIDE
327 bool "Built-in command line overrides boot loader arguments"
329 depends on CMDLINE_BOOL
331 Set this option to 'Y' to have the kernel ignore the boot loader
332 command line, and use ONLY the built-in command line.
334 This is used to work around broken boot loaders. This should
335 be set to 'N' under normal conditions.
337 config VMALLOC_RESERVE
342 bool "Hardwall support to allow access to user dynamic network"
346 int "Processor protection level for kernel"
350 This setting determines the processor protection level the
351 kernel will be built to run at. Generally you should use
352 the default value here.
354 endmenu # Tilera-specific configuration
362 select GENERIC_PCI_IOMAP
364 Enable PCI root complex support, so PCIe endpoint devices can
365 be attached to the Tile chip. Many, but not all, PCI devices
366 are supported under Tilera's root complex driver.
377 source "drivers/pci/Kconfig"
380 bool "Support for hot-pluggable devices"
382 Say Y here if you want to plug devices into your computer while
383 the system is running, and be able to use them quickly. In many
384 cases, the devices can likewise be unplugged at any time too.
385 One well-known example of this is USB.
387 source "drivers/pci/hotplug/Kconfig"
391 menu "Executable file formats"
398 source "fs/Kconfig.binfmt"
404 source "drivers/Kconfig"
408 source "arch/tile/Kconfig.debug"
410 source "security/Kconfig"
412 source "crypto/Kconfig"
416 source "arch/tile/kvm/Kconfig"