1 # For a description of the syntax of this configuration file,
2 # see Documentation/kbuild/kconfig-language.txt.
6 select HAVE_PERF_EVENTS
7 select USE_PMC if PERF_EVENTS
9 select HAVE_DMA_API_DEBUG
10 select HAVE_KVM if !TILEGX
11 select GENERIC_FIND_FIRST_BIT
12 select SYSCTL_EXCEPTION_TRACE
13 select CC_OPTIMIZE_FOR_SIZE
14 select HAVE_DEBUG_KMEMLEAK
15 select GENERIC_IRQ_PROBE
16 select GENERIC_PENDING_IRQ if SMP
17 select GENERIC_IRQ_SHOW
18 select HAVE_DEBUG_BUGVERBOSE
21 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
22 select ARCH_HAVE_NMI_SAFE_CMPXCHG
23 select GENERIC_CLOCKEVENTS
24 select MODULES_USE_ELF_RELA
25 select HAVE_ARCH_TRACEHOOK
26 select HAVE_SYSCALL_TRACEPOINTS
27 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
28 select HAVE_DEBUG_STACKOVERFLOW
29 select ARCH_WANT_FRAME_POINTERS
31 # FIXME: investigate whether we need/want these options.
32 # select HAVE_IOREMAP_PROT
33 # select HAVE_OPTPROBES
34 # select HAVE_REGS_AND_STACK_ACCESS_API
35 # select HAVE_HW_BREAKPOINT
37 # select HAVE_USER_RETURN_NOTIFIER
39 # config ARCH_SUPPORTS_DEBUG_PAGEALLOC
40 # config HUGETLB_PAGE_SIZE_VARIABLE
48 config HAVE_ARCH_ALLOC_REMAP
51 config HAVE_SETUP_PER_CPU_AREA
54 config NEED_PER_CPU_PAGE_FIRST_CHUNK
57 config SYS_SUPPORTS_HUGETLBFS
60 # Support for additional huge page sizes besides HPAGE_SIZE.
61 # The software support is currently only present in the TILE-Gx
62 # hypervisor. TILEPro in any case does not support page sizes
63 # larger than the default HPAGE_SIZE.
64 config HUGETLB_SUPER_PAGES
65 depends on HUGETLB_PAGE && TILEGX
68 config GENERIC_TIME_VSYSCALL
71 # Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.
75 # FIXME: tilegx can implement a more efficient rwsem.
76 config RWSEM_GENERIC_SPINLOCK
79 # We only support gcc 4.4 and above, so this should work.
80 config ARCH_SUPPORTS_OPTIMIZED_INLINING
83 config ARCH_PHYS_ADDR_T_64BIT
86 config ARCH_DMA_ADDR_T_64BIT
89 config NEED_DMA_MAP_STATE
92 config ARCH_HAS_DMA_SET_COHERENT_MASK
95 config LOCKDEP_SUPPORT
98 config STACKTRACE_SUPPORT
102 # We use discontigmem for now; at some point we may want to switch
103 # to sparsemem (Tilera bug 7996).
104 config ARCH_DISCONTIGMEM_ENABLE
107 config ARCH_DISCONTIGMEM_DEFAULT
110 config TRACE_IRQFLAGS_SUPPORT
116 # SMP is required for Tilera Linux.
123 select HVC_IRQ if TILEGX
127 bool "Building for TILE-Gx (64-bit) processor"
129 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
130 select HAVE_FUNCTION_TRACER
131 select HAVE_FUNCTION_GRAPH_TRACER
132 select HAVE_DYNAMIC_FTRACE
133 select HAVE_FTRACE_MCOUNT_RECORD
135 select HAVE_KRETPROBES
136 select HAVE_ARCH_KGDB
144 config ARCH_DEFCONFIG
146 default "arch/tile/configs/tilepro_defconfig" if !TILEGX
147 default "arch/tile/configs/tilegx_defconfig" if TILEGX
149 source "init/Kconfig"
151 source "kernel/Kconfig.freezer"
153 menu "Tilera-specific configuration"
156 int "Maximum number of tiles (2-255)"
161 Building with 64 is the recommended value, but a slightly
162 smaller kernel memory footprint results from using a smaller
163 value on chips with fewer tiles.
168 prompt "Kernel page size"
169 default PAGE_SIZE_64KB
171 This lets you select the page size of the kernel. For best
172 performance on memory-intensive applications, a page size of 64KB
173 is recommended. For workloads involving many small files, many
174 connections, etc., it may be better to select 16KB, which uses
175 memory more efficiently at some cost in TLB performance.
177 Note that this option is TILE-Gx specific; currently
178 TILEPro page size is set by rebuilding the hypervisor.
180 config PAGE_SIZE_16KB
183 config PAGE_SIZE_64KB
190 source "kernel/Kconfig.hz"
193 bool "kexec system call"
195 kexec is a system call that implements the ability to shutdown your
196 current kernel, and to start another kernel. It is like a reboot
197 but it is independent of the system firmware. It is used
198 to implement the "mboot" Tilera booter.
200 The name comes from the similarity to the exec system call.
203 bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
205 select COMPAT_BINFMT_ELF
208 If enabled, the kernel will support running TILE-Gx binaries
209 that were built with the -m32 option.
211 config SYSVIPC_COMPAT
213 depends on COMPAT && SYSVIPC
215 # We do not currently support disabling HIGHMEM on tilepro.
217 bool # "Support for more than 512 MB of RAM"
220 Linux can use the full amount of RAM in the system by
221 default. However, the address space of TILE processors is
222 only 4 Gigabytes large. That means that, if you have a large
223 amount of physical memory, not all of it can be "permanently
224 mapped" by the kernel. The physical memory that's not
225 permanently mapped is called "high memory".
227 If you are compiling a kernel which will never run on a
228 machine with more than 512 MB total physical RAM, answer
229 "false" here. This will result in the kernel mapping all of
230 physical memory into the top 1 GB of virtual memory space.
232 If unsure, say "true".
240 config NEED_SG_DMA_LENGTH
247 select NEED_SG_DMA_LENGTH
248 select ARCH_HAS_DMA_SET_COHERENT_MASK
250 # We do not currently support disabling NUMA.
252 bool # "NUMA Memory Allocation and Scheduler Support"
253 depends on SMP && DISCONTIGMEM
256 NUMA memory allocation is required for TILE processors
257 unless booting with memory striping enabled in the
258 hypervisor, or with only a single memory controller.
259 It is recommended that this option always be enabled.
262 int "Log base 2 of the max number of memory controllers"
264 depends on NEED_MULTIPLE_NODES
266 By default, 2, i.e. 2^2 == 4 DDR2 controllers.
267 In a system with more controllers, this value should be raised.
271 prompt "Memory split" if EXPERT
274 Select the desired split between kernel and user memory.
276 If the address range available to the kernel is less than the
277 physical memory installed, the remaining memory will be available
278 as "high memory". Accessing high memory is a little more costly
279 than low memory, as it needs to be mapped into the kernel first.
280 Note that increasing the kernel address space limits the range
281 available to user programs, making the address space there
282 tighter. Selecting anything other than the default 3G/1G split
283 will also likely make your kernel incompatible with binary-only
286 If you are not absolutely sure what you are doing, leave this
290 bool "3.75G/0.25G user/kernel split (no kernel networking)"
292 bool "3.5G/0.5G user/kernel split"
294 bool "3G/1G user/kernel split"
296 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
298 bool "2.5G/1.5G user/kernel split"
300 bool "2.25G/1.75G user/kernel split"
302 bool "2G/2G user/kernel split"
304 bool "1G/3G user/kernel split"
310 default 0xF0000000 if VMSPLIT_3_75G
311 default 0xE0000000 if VMSPLIT_3_5G
312 default 0xB0000000 if VMSPLIT_2_75G
313 default 0xA0000000 if VMSPLIT_2_5G
314 default 0x90000000 if VMSPLIT_2_25G
315 default 0x80000000 if VMSPLIT_2G
316 default 0x40000000 if VMSPLIT_1G
321 source "kernel/Kconfig.preempt"
324 bool "Built-in kernel command line"
327 Allow for specifying boot arguments to the kernel at
328 build time. On some systems (e.g. embedded ones), it is
329 necessary or convenient to provide some or all of the
330 kernel boot arguments with the kernel itself (that is,
331 to not rely on the boot loader to provide them.)
333 To compile command line arguments into the kernel,
334 set this option to 'Y', then fill in the
335 the boot arguments in CONFIG_CMDLINE.
337 Systems with fully functional boot loaders (e.g. mboot, or
338 if booting over PCI) should leave this option set to 'N'.
341 string "Built-in kernel command string"
342 depends on CMDLINE_BOOL
345 Enter arguments here that should be compiled into the kernel
346 image and used at boot time. If the boot loader provides a
347 command line at boot time, it is appended to this string to
348 form the full kernel command line, when the system boots.
350 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
351 change this behavior.
353 In most cases, the command line (whether built-in or provided
354 by the boot loader) should specify the device for the root
357 config CMDLINE_OVERRIDE
358 bool "Built-in command line overrides boot loader arguments"
360 depends on CMDLINE_BOOL
362 Set this option to 'Y' to have the kernel ignore the boot loader
363 command line, and use ONLY the built-in command line.
365 This is used to work around broken boot loaders. This should
366 be set to 'N' under normal conditions.
368 config VMALLOC_RESERVE
373 bool "Hardwall support to allow access to user dynamic network"
377 int "Processor protection level for kernel"
382 Since MDE 4.2, the Tilera hypervisor runs the kernel
383 at PL2 by default. If running under an older hypervisor,
384 or as a KVM guest, you must run at PL1. (The current
385 hypervisor may also be recompiled with "make HV_PL=2" to
386 allow it to run a kernel at PL1, but clients running at PL1
387 are not expected to be supported indefinitely.)
389 If you're not sure, don't change the default.
391 source "arch/tile/gxio/Kconfig"
393 endmenu # Tilera-specific configuration
401 select GENERIC_PCI_IOMAP
402 select TILE_GXIO_TRIO if TILEGX
403 select PCI_MSI if TILEGX
405 Enable PCI root complex support, so PCIe endpoint devices can
406 be attached to the Tile chip. Many, but not all, PCI devices
407 are supported under Tilera's root complex driver.
419 bool "PCI I/O space support"
424 Enable PCI I/O space support on TILEGx. Since the PCI I/O space
425 is used by few modern PCIe endpoint devices, its support is disabled
426 by default to save the TRIO PIO Region resource for other purposes.
428 source "drivers/pci/Kconfig"
430 source "drivers/pci/pcie/Kconfig"
433 tristate "Tilera USB host adapter support"
437 select TILE_GXIO_USB_HOST
439 Provides USB host adapter support for the built-in EHCI and OHCI
440 interfaces on TILE-Gx chips.
442 source "drivers/pci/hotplug/Kconfig"
446 menu "Executable file formats"
448 source "fs/Kconfig.binfmt"
454 source "drivers/Kconfig"
458 source "arch/tile/Kconfig.debug"
460 source "security/Kconfig"
462 source "crypto/Kconfig"
466 source "arch/tile/kvm/Kconfig"