drivers/sh/Kconfig

   1 config INTC_USERIMASK
   2         bool "Userspace interrupt masking support"
   3         depends on ARCH_SHMOBILE || (SUPERH && CPU_SH4A)
   4         help
   5           This enables support for hardware-assisted userspace hardirq
   6           masking.
   7
   8           SH-4A and newer interrupt blocks all support a special shadowed
   9           page with all non-masking registers obscured when mapped in to
  10           userspace. This is primarily for use by userspace device
  11           drivers that are using special priority levels.
  12
  13           If in doubt, say N.