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authorDave Gerlach <d-gerlach@ti.com>2017-01-12 23:52:20 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-25 13:48:03 +0300
commit37afff0d87c9939843c664970af6c6d952f95712 (patch)
tree8ea28a8a049eec9ff3b3d4eee4becfab678d9a45 /drivers/misc/Kconfig
parent728bbe75c82fdc6bdf157652a4351856ed08afc4 (diff)
downloadlinux-37afff0d87c9939843c664970af6c6d952f95712.tar.xz
misc: sram: Integrate protect-exec reserved sram area type
Introduce a new "protect-exec" reserved sram area type which is makes use of the the existing functionality provided for the "pool" sram region type for use with the genalloc framework and with the added requirement that it be maintained as read-only and executable while allowing for an arbitrary number of drivers to share the space. This introduces a common way to maintain a region of sram as read-only and executable and also introduces a helper function, sram_exec_copy, which allows for copying data to this protected region while maintaining locking to avoid conflicts between multiple users of the same space. A region of memory that is marked with the "protect-exec" flag in the device tree also has the requirement of providing a page aligned block of memory so that the page attribute manipulation does not affect surrounding regions. Also, selectively enable this only for builds that support set_memory_* calls, for now just ARM, through the use of Kconfig. Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/Kconfig')
-rw-r--r--drivers/misc/Kconfig4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 64971baf11fa..0444a8f9b094 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -474,11 +474,15 @@ config SRAM
bool "Generic on-chip SRAM driver"
depends on HAS_IOMEM
select GENERIC_ALLOCATOR
+ select SRAM_EXEC if ARM
help
This driver allows you to declare a memory region to be managed by
the genalloc API. It is supposed to be used for small on-chip SRAM
areas found on many SoCs.
+config SRAM_EXEC
+ bool
+
config VEXPRESS_SYSCFG
bool "Versatile Express System Configuration driver"
depends on VEXPRESS_CONFIG