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| author | Dave Gerlach <d-gerlach@ti.com> | 2017-01-12 21:52:20 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-25 11:48:03 +0100 |
| commit | 37afff0d87c9939843c664970af6c6d952f95712 (patch) | |
| tree | 8ea28a8a049eec9ff3b3d4eee4becfab678d9a45 /drivers/misc/Kconfig | |
| parent | misc: sram: Introduce support code for protect-exec sram type (diff) | |
| download | linux-37afff0d87c9939843c664970af6c6d952f95712.tar.xz linux-37afff0d87c9939843c664970af6c6d952f95712.zip | |
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/Kconfig | 4 |
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 |