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authorPaul Mundt <lethal@linux-sh.org>2010-04-13 14:43:03 +0900
committerPaul Mundt <lethal@linux-sh.org>2010-04-13 14:43:03 +0900
commit43b8774dc409ea5d9369b978e2e7bc79289f0522 (patch)
tree13aa346ff8f30786e8ce3ccfdd8341d182ce4c87 /drivers/sh/Kconfig
parent12129fea50edcd696a9556523b058d6c445f21d8 (diff)
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sh: intc: userimask support.
This adds support for hardware-assisted userspace irq masking for special priority levels. Due to the SR.IMASK interactivity, only some platforms implement this in hardware (including but not limited to SH-4A interrupt controllers, and ARM-based SH-Mobile CPUs). Each CPU needs to wire this up on its own, for now only SH7786 is wired up as an example. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/sh/Kconfig')
-rw-r--r--drivers/sh/Kconfig13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/sh/Kconfig b/drivers/sh/Kconfig
new file mode 100644
index 000000000000..22c3cdaf22fe
--- /dev/null
+++ b/drivers/sh/Kconfig
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+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.