1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/config-language.txt.
6 select HAVE_KVM if !TILEGX
7 select GENERIC_FIND_FIRST_BIT
8 select GENERIC_FIND_NEXT_BIT
9 select USE_GENERIC_SMP_HELPERS
10 select CC_OPTIMIZE_FOR_SIZE
11 select HAVE_GENERIC_HARDIRQS
12 select GENERIC_IRQ_PROBE
13 select GENERIC_PENDING_IRQ if SMP
15 # FIXME: investigate whether we need/want these options.
16 # select HAVE_IOREMAP_PROT
17 # select HAVE_OPTPROBES
18 # select HAVE_REGS_AND_STACK_ACCESS_API
19 # select HAVE_HW_BREAKPOINT
21 # select HAVE_USER_RETURN_NOTIFIER
23 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
24 # config HUGETLB_PAGE_SIZE_VARIABLE
32 config SEMAPHORE_SLEEPERS
35 config HAVE_ARCH_ALLOC_REMAP
38 config HAVE_SETUP_PER_CPU_AREA
41 config NEED_PER_CPU_PAGE_FIRST_CHUNK
44 config SYS_SUPPORTS_HUGETLBFS
50 config GENERIC_CLOCKEVENTS
53 # FIXME: tilegx can implement a more efficent rwsem.
54 config RWSEM_GENERIC_SPINLOCK
57 # We have a very flat architecture from a migration point of view,
58 # so save boot time by presetting this (particularly useful on tile-sim).
59 config DEFAULT_MIGRATION_COST
63 # We only support gcc 4.4 and above, so this should work.
64 config ARCH_SUPPORTS_OPTIMIZED_INLINING
67 config ARCH_PHYS_ADDR_T_64BIT
70 config ARCH_DMA_ADDR_T_64BIT
73 config LOCKDEP_SUPPORT
76 config STACKTRACE_SUPPORT
80 # We use discontigmem for now; at some point we may want to switch
81 # to sparsemem (Tilera bug 7996).
82 config ARCH_DISCONTIGMEM_ENABLE
85 config ARCH_DISCONTIGMEM_DEFAULT
88 config TRACE_IRQFLAGS_SUPPORT
94 # SMP is required for Tilera Linux.
98 # Allow checking for compile-time determined overflow errors in
99 # copy_from_user(). There are still unprovable places in the
100 # generic code as of 2.6.34, so this option is not really compatible
101 # with -Werror, which is more useful in general.
102 config DEBUG_COPY_FROM_USER
109 # Please note: TILE-Gx support is not yet finalized; this is
110 # the preliminary support. TILE-Gx drivers are only provided
111 # with the alpha or beta test versions for Tilera customers.
113 depends on EXPERIMENTAL
114 bool "Building with TILE-Gx (64-bit) compiler and toolchain"
120 config ARCH_DEFCONFIG
122 default "arch/tile/configs/tile_defconfig" if !TILEGX
123 default "arch/tile/configs/tilegx_defconfig" if TILEGX
125 source "init/Kconfig"
127 menu "Tilera-specific configuration"
130 int "Maximum number of tiles (2-255)"
135 Building with 64 is the recommended value, but a slightly
136 smaller kernel memory footprint results from using a smaller
137 value on chips with fewer tiles.
139 source "kernel/time/Kconfig"
141 source "kernel/Kconfig.hz"
144 bool "kexec system call"
146 kexec is a system call that implements the ability to shutdown your
147 current kernel, and to start another kernel. It is like a reboot
148 but it is independent of the system firmware. It is used
149 to implement the "mboot" Tilera booter.
151 The name comes from the similarity to the exec system call.
154 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
156 select COMPAT_BINFMT_ELF
159 If enabled, the kernel will support running TILE-Gx binaries
160 that were built with the -m32 option.
162 config SYSVIPC_COMPAT
164 depends on COMPAT && SYSVIPC
166 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
168 bool # "Support for more than 512 MB of RAM"
171 Linux can use the full amount of RAM in the system by
172 default. However, the address space of TILE processors is
173 only 4 Gigabytes large. That means that, if you have a large
174 amount of physical memory, not all of it can be "permanently
175 mapped" by the kernel. The physical memory that's not
176 permanently mapped is called "high memory".
178 If you are compiling a kernel which will never run on a
179 machine with more than 512 MB total physical RAM, answer
180 "false" here. This will result in the kernel mapping all of
181 physical memory into the top 1 GB of virtual memory space.
183 If unsure, say "true".
185 # We do not currently support disabling NUMA.
187 bool # "NUMA Memory Allocation and Scheduler Support"
188 depends on SMP && DISCONTIGMEM
191 NUMA memory allocation is required for TILE processors
192 unless booting with memory striping enabled in the
193 hypervisor, or with only a single memory controller.
194 It is recommended that this option always be enabled.
197 int "Log base 2 of the max number of memory controllers"
199 depends on NEED_MULTIPLE_NODES
201 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
202 In a system with more controllers, this value should be raised.
204 # Need 16MB areas to enable hugetlb
205 # See build-time check in arch/tile/mm/init.c.
206 config FORCE_MAX_ZONEORDER
212 prompt "Memory split" if EXPERT
215 Select the desired split between kernel and user memory.
217 If the address range available to the kernel is less than the
218 physical memory installed, the remaining memory will be available
219 as "high memory". Accessing high memory is a little more costly
220 than low memory, as it needs to be mapped into the kernel first.
221 Note that increasing the kernel address space limits the range
222 available to user programs, making the address space there
223 tighter. Selecting anything other than the default 3G/1G split
224 will also likely make your kernel incompatible with binary-only
227 If you are not absolutely sure what you are doing, leave this
231 bool "3.75G/0.25G user/kernel split (no kernel networking)"
233 bool "3.5G/0.5G user/kernel split"
235 bool "3G/1G user/kernel split"
236 config VMSPLIT_3G_OPT
237 bool "3G/1G user/kernel split (for full 1G low memory)"
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_3G_OPT
249 default 0x80000000 if VMSPLIT_2G
250 default 0x40000000 if VMSPLIT_1G
256 bool "Built-in kernel command line"
259 Allow for specifying boot arguments to the kernel at
260 build time. On some systems (e.g. embedded ones), it is
261 necessary or convenient to provide some or all of the
262 kernel boot arguments with the kernel itself (that is,
263 to not rely on the boot loader to provide them.)
265 To compile command line arguments into the kernel,
266 set this option to 'Y', then fill in the
267 the boot arguments in CONFIG_CMDLINE.
269 Systems with fully functional boot loaders (e.g. mboot, or
270 if booting over PCI) should leave this option set to 'N'.
273 string "Built-in kernel command string"
274 depends on CMDLINE_BOOL
277 Enter arguments here that should be compiled into the kernel
278 image and used at boot time. If the boot loader provides a
279 command line at boot time, it is appended to this string to
280 form the full kernel command line, when the system boots.
282 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
283 change this behavior.
285 In most cases, the command line (whether built-in or provided
286 by the boot loader) should specify the device for the root
289 config CMDLINE_OVERRIDE
290 bool "Built-in command line overrides boot loader arguments"
292 depends on CMDLINE_BOOL
294 Set this option to 'Y' to have the kernel ignore the boot loader
295 command line, and use ONLY the built-in command line.
297 This is used to work around broken boot loaders. This should
298 be set to 'N' under normal conditions.
300 config VMALLOC_RESERVE
305 bool "Hardwall support to allow access to user dynamic network"
309 int "Processor protection level for kernel"
313 This setting determines the processor protection level the
314 kernel will be built to run at. Generally you should use
315 the default value here.
317 endmenu # Tilera-specific configuration
326 Enable PCI root complex support, so PCIe endpoint devices can
327 be attached to the Tile chip. Many, but not all, PCI devices
328 are supported under Tilera's root complex driver.
339 source "drivers/pci/Kconfig"
341 source "drivers/pci/hotplug/Kconfig"
345 menu "Executable file formats"
352 source "fs/Kconfig.binfmt"
358 source "drivers/Kconfig"
362 source "arch/tile/Kconfig.debug"
364 source "security/Kconfig"
366 source "crypto/Kconfig"
370 source "arch/tile/kvm/Kconfig"