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
15 select ARCH_HAVE_NMI_SAFE_CMPXCHG if !M386
17 # FIXME: investigate whether we need/want these options.
18 # select HAVE_IOREMAP_PROT
19 # select HAVE_OPTPROBES
20 # select HAVE_REGS_AND_STACK_ACCESS_API
21 # select HAVE_HW_BREAKPOINT
23 # select HAVE_USER_RETURN_NOTIFIER
25 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
26 # config HUGETLB_PAGE_SIZE_VARIABLE
34 config SEMAPHORE_SLEEPERS
37 config HAVE_ARCH_ALLOC_REMAP
40 config HAVE_SETUP_PER_CPU_AREA
43 config NEED_PER_CPU_PAGE_FIRST_CHUNK
46 config SYS_SUPPORTS_HUGETLBFS
52 config GENERIC_CLOCKEVENTS
55 # FIXME: tilegx can implement a more efficient rwsem.
56 config RWSEM_GENERIC_SPINLOCK
59 # We have a very flat architecture from a migration point of view,
60 # so save boot time by presetting this (particularly useful on tile-sim).
61 config DEFAULT_MIGRATION_COST
65 # We only support gcc 4.4 and above, so this should work.
66 config ARCH_SUPPORTS_OPTIMIZED_INLINING
69 config ARCH_PHYS_ADDR_T_64BIT
72 config ARCH_DMA_ADDR_T_64BIT
75 config LOCKDEP_SUPPORT
78 config STACKTRACE_SUPPORT
82 # We use discontigmem for now; at some point we may want to switch
83 # to sparsemem (Tilera bug 7996).
84 config ARCH_DISCONTIGMEM_ENABLE
87 config ARCH_DISCONTIGMEM_DEFAULT
90 config TRACE_IRQFLAGS_SUPPORT
96 # SMP is required for Tilera Linux.
100 # Allow checking for compile-time determined overflow errors in
101 # copy_from_user(). There are still unprovable places in the
102 # generic code as of 2.6.34, so this option is not really compatible
103 # with -Werror, which is more useful in general.
104 config DEBUG_COPY_FROM_USER
111 # Please note: TILE-Gx support is not yet finalized; this is
112 # the preliminary support. TILE-Gx drivers are only provided
113 # with the alpha or beta test versions for Tilera customers.
115 depends on EXPERIMENTAL
116 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
122 config ARCH_DEFCONFIG
124 default "arch/tile/configs/tile_defconfig" if !TILEGX
125 default "arch/tile/configs/tilegx_defconfig" if TILEGX
127 source "init/Kconfig"
129 menu "Tilera-specific configuration"
132 int "Maximum number of tiles (2-255)"
137 Building with 64 is the recommended value, but a slightly
138 smaller kernel memory footprint results from using a smaller
139 value on chips with fewer tiles.
141 source "kernel/time/Kconfig"
143 source "kernel/Kconfig.hz"
146 bool "kexec system call"
148 kexec is a system call that implements the ability to shutdown your
149 current kernel, and to start another kernel. It is like a reboot
150 but it is independent of the system firmware. It is used
151 to implement the "mboot" Tilera booter.
153 The name comes from the similarity to the exec system call.
156 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
158 select COMPAT_BINFMT_ELF
161 If enabled, the kernel will support running TILE-Gx binaries
162 that were built with the -m32 option.
164 config SYSVIPC_COMPAT
166 depends on COMPAT && SYSVIPC
168 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
170 bool # "Support for more than 512 MB of RAM"
173 Linux can use the full amount of RAM in the system by
174 default. However, the address space of TILE processors is
175 only 4 Gigabytes large. That means that, if you have a large
176 amount of physical memory, not all of it can be "permanently
177 mapped" by the kernel. The physical memory that's not
178 permanently mapped is called "high memory".
180 If you are compiling a kernel which will never run on a
181 machine with more than 512 MB total physical RAM, answer
182 "false" here. This will result in the kernel mapping all of
183 physical memory into the top 1 GB of virtual memory space.
185 If unsure, say "true".
187 # We do not currently support disabling NUMA.
189 bool # "NUMA Memory Allocation and Scheduler Support"
190 depends on SMP && DISCONTIGMEM
193 NUMA memory allocation is required for TILE processors
194 unless booting with memory striping enabled in the
195 hypervisor, or with only a single memory controller.
196 It is recommended that this option always be enabled.
199 int "Log base 2 of the max number of memory controllers"
201 depends on NEED_MULTIPLE_NODES
203 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
204 In a system with more controllers, this value should be raised.
208 prompt "Memory split" if EXPERT
211 Select the desired split between kernel and user memory.
213 If the address range available to the kernel is less than the
214 physical memory installed, the remaining memory will be available
215 as "high memory". Accessing high memory is a little more costly
216 than low memory, as it needs to be mapped into the kernel first.
217 Note that increasing the kernel address space limits the range
218 available to user programs, making the address space there
219 tighter. Selecting anything other than the default 3G/1G split
220 will also likely make your kernel incompatible with binary-only
223 If you are not absolutely sure what you are doing, leave this
227 bool "3.75G/0.25G user/kernel split (no kernel networking)"
229 bool "3.5G/0.5G user/kernel split"
231 bool "3G/1G user/kernel split"
233 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
235 bool "2.5G/1.5G user/kernel split"
237 bool "2.25G/1.75G user/kernel split"
239 bool "2G/2G user/kernel split"
241 bool "1G/3G user/kernel split"
246 default 0xF0000000 if VMSPLIT_3_75G
247 default 0xE0000000 if VMSPLIT_3_5G
248 default 0xB0000000 if VMSPLIT_2_75G
249 default 0xA0000000 if VMSPLIT_2_5G
250 default 0x90000000 if VMSPLIT_2_25G
251 default 0x80000000 if VMSPLIT_2G
252 default 0x40000000 if VMSPLIT_1G
258 bool "Built-in kernel command line"
261 Allow for specifying boot arguments to the kernel at
262 build time. On some systems (e.g. embedded ones), it is
263 necessary or convenient to provide some or all of the
264 kernel boot arguments with the kernel itself (that is,
265 to not rely on the boot loader to provide them.)
267 To compile command line arguments into the kernel,
268 set this option to 'Y', then fill in the
269 the boot arguments in CONFIG_CMDLINE.
271 Systems with fully functional boot loaders (e.g. mboot, or
272 if booting over PCI) should leave this option set to 'N'.
275 string "Built-in kernel command string"
276 depends on CMDLINE_BOOL
279 Enter arguments here that should be compiled into the kernel
280 image and used at boot time. If the boot loader provides a
281 command line at boot time, it is appended to this string to
282 form the full kernel command line, when the system boots.
284 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
285 change this behavior.
287 In most cases, the command line (whether built-in or provided
288 by the boot loader) should specify the device for the root
291 config CMDLINE_OVERRIDE
292 bool "Built-in command line overrides boot loader arguments"
294 depends on CMDLINE_BOOL
296 Set this option to 'Y' to have the kernel ignore the boot loader
297 command line, and use ONLY the built-in command line.
299 This is used to work around broken boot loaders. This should
300 be set to 'N' under normal conditions.
302 config VMALLOC_RESERVE
307 bool "Hardwall support to allow access to user dynamic network"
311 int "Processor protection level for kernel"
315 This setting determines the processor protection level the
316 kernel will be built to run at. Generally you should use
317 the default value here.
319 endmenu # Tilera-specific configuration
328 Enable PCI root complex support, so PCIe endpoint devices can
329 be attached to the Tile chip. Many, but not all, PCI devices
330 are supported under Tilera's root complex driver.
341 source "drivers/pci/Kconfig"
344 bool "Support for hot-pluggable devices"
346 Say Y here if you want to plug devices into your computer while
347 the system is running, and be able to use them quickly. In many
348 cases, the devices can likewise be unplugged at any time too.
349 One well-known example of this is USB.
351 source "drivers/pci/hotplug/Kconfig"
355 menu "Executable file formats"
362 source "fs/Kconfig.binfmt"
368 source "drivers/Kconfig"
372 source "arch/tile/Kconfig.debug"
374 source "security/Kconfig"
376 source "crypto/Kconfig"
380 source "arch/tile/kvm/Kconfig"