mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 01:49:36 +00:00
![Max Filippov](/assets/img/avatar_default.png)
These syscalls are not used by userspace tools for some time now, and they have issues when called with invalid arguments. It's not worth changing signal delivery mechanism as we don't expect any new users for these syscalls. Let's keep them for backwards compatibility under #ifdef, disabled by default. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
431 lines
12 KiB
Text
431 lines
12 KiB
Text
config ZONE_DMA
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def_bool y
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config XTENSA
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def_bool y
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select ARCH_WANT_FRAME_POINTERS
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select ARCH_WANT_IPC_PARSE_VERSION
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select ARCH_WANT_OPTIONAL_GPIOLIB
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select BUILDTIME_EXTABLE_SORT
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select CLONE_BACKWARDS
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select COMMON_CLK
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select GENERIC_ATOMIC64
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select GENERIC_CLOCKEVENTS
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select GENERIC_IRQ_SHOW
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select GENERIC_PCI_IOMAP
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select GENERIC_SCHED_CLOCK
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select HAVE_FUNCTION_TRACER
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select HAVE_IRQ_TIME_ACCOUNTING
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select HAVE_OPROFILE
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select HAVE_PERF_EVENTS
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select IRQ_DOMAIN
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select MODULES_USE_ELF_RELA
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select VIRT_TO_BUS
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help
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Xtensa processors are 32-bit RISC machines designed by Tensilica
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primarily for embedded systems. These processors are both
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configurable and extensible. The Linux port to the Xtensa
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architecture supports all processor configurations and extensions,
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with reasonable minimum requirements. The Xtensa Linux project has
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a home page at <http://www.linux-xtensa.org/>.
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config RWSEM_XCHGADD_ALGORITHM
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def_bool y
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config GENERIC_HWEIGHT
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def_bool y
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config ARCH_HAS_ILOG2_U32
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def_bool n
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config ARCH_HAS_ILOG2_U64
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def_bool n
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config NO_IOPORT_MAP
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def_bool n
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config HZ
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int
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default 100
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source "init/Kconfig"
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source "kernel/Kconfig.freezer"
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config LOCKDEP_SUPPORT
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def_bool y
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config STACKTRACE_SUPPORT
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def_bool y
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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config MMU
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bool
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default n if !XTENSA_VARIANT_CUSTOM
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default XTENSA_VARIANT_MMU if XTENSA_VARIANT_CUSTOM
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config VARIANT_IRQ_SWITCH
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def_bool n
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config HAVE_XTENSA_GPIO32
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def_bool n
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config MAY_HAVE_SMP
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def_bool n
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menu "Processor type and features"
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choice
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prompt "Xtensa Processor Configuration"
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default XTENSA_VARIANT_FSF
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config XTENSA_VARIANT_FSF
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bool "fsf - default (not generic) configuration"
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select MMU
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config XTENSA_VARIANT_DC232B
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bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
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select MMU
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select HAVE_XTENSA_GPIO32
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help
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This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
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config XTENSA_VARIANT_DC233C
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bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
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select MMU
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select HAVE_XTENSA_GPIO32
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help
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This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
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config XTENSA_VARIANT_S6000
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bool "s6000 - Stretch software configurable processor"
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select VARIANT_IRQ_SWITCH
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select ARCH_REQUIRE_GPIOLIB
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select XTENSA_CALIBRATE_CCOUNT
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config XTENSA_VARIANT_CUSTOM
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bool "Custom Xtensa processor configuration"
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select MAY_HAVE_SMP
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select HAVE_XTENSA_GPIO32
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help
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Select this variant to use a custom Xtensa processor configuration.
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You will be prompted for a processor variant CORENAME.
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endchoice
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config XTENSA_VARIANT_CUSTOM_NAME
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string "Xtensa Processor Custom Core Variant Name"
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depends on XTENSA_VARIANT_CUSTOM
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help
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Provide the name of a custom Xtensa processor variant.
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This CORENAME selects arch/xtensa/variant/CORENAME.
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Dont forget you have to select MMU if you have one.
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config XTENSA_VARIANT_NAME
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string
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default "dc232b" if XTENSA_VARIANT_DC232B
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default "dc233c" if XTENSA_VARIANT_DC233C
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default "fsf" if XTENSA_VARIANT_FSF
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default "s6000" if XTENSA_VARIANT_S6000
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default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM
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config XTENSA_VARIANT_MMU
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bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
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depends on XTENSA_VARIANT_CUSTOM
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default y
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help
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Build a Conventional Kernel with full MMU support,
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ie: it supports a TLB with auto-loading, page protection.
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config XTENSA_UNALIGNED_USER
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bool "Unaligned memory access in use space"
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help
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The Xtensa architecture currently does not handle unaligned
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memory accesses in hardware but through an exception handler.
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Per default, unaligned memory accesses are disabled in user space.
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Say Y here to enable unaligned memory access in user space.
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source "kernel/Kconfig.preempt"
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config HAVE_SMP
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bool "System Supports SMP (MX)"
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depends on MAY_HAVE_SMP
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select XTENSA_MX
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help
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This option is use to indicate that the system-on-a-chip (SOC)
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supports Multiprocessing. Multiprocessor support implemented above
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the CPU core definition and currently needs to be selected manually.
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Multiprocessor support in implemented with external cache and
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interrupt controlers.
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The MX interrupt distributer adds Interprocessor Interrupts
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and causes the IRQ numbers to be increased by 4 for devices
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like the open cores ethernet driver and the serial interface.
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You still have to select "Enable SMP" to enable SMP on this SOC.
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config SMP
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bool "Enable Symmetric multi-processing support"
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depends on HAVE_SMP
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select GENERIC_SMP_IDLE_THREAD
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help
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Enabled SMP Software; allows more than one CPU/CORE
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to be activated during startup.
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config NR_CPUS
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depends on SMP
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int "Maximum number of CPUs (2-32)"
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range 2 32
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default "4"
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config HOTPLUG_CPU
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bool "Enable CPU hotplug support"
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depends on SMP
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help
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Say Y here to allow turning CPUs off and on. CPUs can be
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controlled through /sys/devices/system/cpu.
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Say N if you want to disable CPU hotplug.
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config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
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bool "Initialize Xtensa MMU inside the Linux kernel code"
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depends on MMU
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default y
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help
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Earlier version initialized the MMU in the exception vector
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before jumping to _startup in head.S and had an advantage that
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it was possible to place a software breakpoint at 'reset' and
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then enter your normal kernel breakpoints once the MMU was mapped
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to the kernel mappings (0XC0000000).
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This unfortunately doesn't work for U-Boot and likley also wont
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work for using KEXEC to have a hot kernel ready for doing a
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KDUMP.
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So now the MMU is initialized in head.S but it's necessary to
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use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
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xt-gdb can't place a Software Breakpoint in the 0XD region prior
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to mapping the MMU and after mapping even if the area of low memory
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was mapped gdb wouldn't remove the breakpoint on hitting it as the
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PC wouldn't match. Since Hardware Breakpoints are recommended for
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Linux configurations it seems reasonable to just assume they exist
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and leave this older mechanism for unfortunate souls that choose
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not to follow Tensilica's recommendation.
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Selecting this will cause U-Boot to set the KERNEL Load and Entry
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address at 0x00003000 instead of the mapped std of 0xD0003000.
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If in doubt, say Y.
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config HIGHMEM
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bool "High Memory Support"
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depends on MMU
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help
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Linux can use the full amount of RAM in the system by
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default. However, the default MMUv2 setup only maps the
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lowermost 128 MB of memory linearly to the areas starting
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at 0xd0000000 (cached) and 0xd8000000 (uncached).
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When there are more than 128 MB memory in the system not
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all of it can be "permanently mapped" by the kernel.
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The physical memory that's not permanently mapped is called
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"high memory".
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If you are compiling a kernel which will never run on a
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machine with more than 128 MB total physical RAM, answer
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N here.
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If unsure, say Y.
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config FAST_SYSCALL_XTENSA
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bool "Enable fast atomic syscalls"
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default n
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help
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fast_syscall_xtensa is a syscall that can make atomic operations
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on UP kernel when processor has no s32c1i support.
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This syscall is deprecated. It may have issues when called with
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invalid arguments. It is provided only for backwards compatibility.
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Only enable it if your userspace software requires it.
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If unsure, say N.
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config FAST_SYSCALL_SPILL_REGISTERS
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bool "Enable spill registers syscall"
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default n
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help
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fast_syscall_spill_registers is a syscall that spills all active
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register windows of a calling userspace task onto its stack.
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This syscall is deprecated. It may have issues when called with
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invalid arguments. It is provided only for backwards compatibility.
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Only enable it if your userspace software requires it.
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If unsure, say N.
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endmenu
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config XTENSA_CALIBRATE_CCOUNT
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def_bool n
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help
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On some platforms (XT2000, for example), the CPU clock rate can
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vary. The frequency can be determined, however, by measuring
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against a well known, fixed frequency, such as an UART oscillator.
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config SERIAL_CONSOLE
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def_bool n
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menu "Bus options"
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config PCI
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bool "PCI support"
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default y
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help
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Find out whether you have a PCI motherboard. PCI is the name of a
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bus system, i.e. the way the CPU talks to the other stuff inside
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your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
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VESA. If you have PCI, say Y, otherwise N.
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source "drivers/pci/Kconfig"
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endmenu
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menu "Platform options"
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choice
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prompt "Xtensa System Type"
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default XTENSA_PLATFORM_ISS
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config XTENSA_PLATFORM_ISS
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bool "ISS"
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select XTENSA_CALIBRATE_CCOUNT
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select SERIAL_CONSOLE
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help
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ISS is an acronym for Tensilica's Instruction Set Simulator.
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config XTENSA_PLATFORM_XT2000
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bool "XT2000"
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select HAVE_IDE
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help
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XT2000 is the name of Tensilica's feature-rich emulation platform.
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This hardware is capable of running a full Linux distribution.
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config XTENSA_PLATFORM_S6105
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bool "S6105"
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select HAVE_IDE
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select SERIAL_CONSOLE
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select NO_IOPORT_MAP
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config XTENSA_PLATFORM_XTFPGA
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bool "XTFPGA"
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select SERIAL_CONSOLE
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select ETHOC
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select XTENSA_CALIBRATE_CCOUNT
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help
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XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
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This hardware is capable of running a full Linux distribution.
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endchoice
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config XTENSA_CPU_CLOCK
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int "CPU clock rate [MHz]"
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depends on !XTENSA_CALIBRATE_CCOUNT
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default 16
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config GENERIC_CALIBRATE_DELAY
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bool "Auto calibration of the BogoMIPS value"
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help
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The BogoMIPS value can easily be derived from the CPU frequency.
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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config CMDLINE
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string "Initial kernel command string"
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depends on CMDLINE_BOOL
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default "console=ttyS0,38400 root=/dev/ram"
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help
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On some architectures (EBSA110 and CATS), there is currently no way
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for the boot loader to pass arguments to the kernel. For these
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architectures, you should supply some command-line options at build
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time by entering them here. As a minimum, you should specify the
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memory size and the root device (e.g., mem=64M root=/dev/nfs).
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config USE_OF
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bool "Flattened Device Tree support"
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select OF
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select OF_EARLY_FLATTREE
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help
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Include support for flattened device tree machine descriptions.
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config BUILTIN_DTB
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string "DTB to build into the kernel image"
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depends on OF
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config BLK_DEV_SIMDISK
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tristate "Host file-based simulated block device support"
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default n
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depends on XTENSA_PLATFORM_ISS
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help
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Create block devices that map to files in the host file system.
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Device binding to host file may be changed at runtime via proc
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interface provided the device is not in use.
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config BLK_DEV_SIMDISK_COUNT
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int "Number of host file-based simulated block devices"
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range 1 10
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depends on BLK_DEV_SIMDISK
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default 2
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help
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This is the default minimal number of created block devices.
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Kernel/module parameter 'simdisk_count' may be used to change this
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value at runtime. More file names (but no more than 10) may be
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specified as parameters, simdisk_count grows accordingly.
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config SIMDISK0_FILENAME
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string "Host filename for the first simulated device"
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depends on BLK_DEV_SIMDISK = y
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default ""
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help
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Attach a first simdisk to a host file. Conventionally, this file
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contains a root file system.
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config SIMDISK1_FILENAME
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string "Host filename for the second simulated device"
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depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
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default ""
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help
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Another simulated disk in a host file for a buildroot-independent
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storage.
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source "mm/Kconfig"
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source "drivers/pcmcia/Kconfig"
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source "drivers/pci/hotplug/Kconfig"
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endmenu
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menu "Executable file formats"
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source "fs/Kconfig.binfmt"
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endmenu
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source "net/Kconfig"
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source "drivers/Kconfig"
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source "fs/Kconfig"
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source "arch/xtensa/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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