config INTC_USERIMASK bool "Userspace interrupt masking support" depends on ARCH_SHMOBILE || (SUPERH && CPU_SH4A) help This enables support for hardware-assisted userspace hardirq masking. SH-4A and newer interrupt blocks all support a special shadowed page with all non-masking registers obscured when mapped in to userspace. This is primarily for use by userspace device drivers that are using special priority levels. If in doubt, say N.