diff options
| -rw-r--r-- | Documentation/devicetree/bindings/sram/sram.txt | 6 | ||||
| -rw-r--r-- | drivers/misc/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/misc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/sram.c | 21 | ||||
| -rw-r--r-- | drivers/misc/sram.h | 1 |
5 files changed, 31 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/sram/sram.txt b/Documentation/devicetree/bindings/sram/sram.txt index 068c2c03c38f..267da4410aef 100644 --- a/Documentation/devicetree/bindings/sram/sram.txt +++ b/Documentation/devicetree/bindings/sram/sram.txt @@ -42,6 +42,12 @@ Optional properties in the area nodes: and in use by another device or devices - export : indicates that the reserved SRAM area may be accessed outside of the kernel, e.g. by bootloader or userspace +- protect-exec : Same as 'pool' above but with the additional + constraint that code wil be run from the region and + that the memory is maintained as read-only, executable + during code execution. NOTE: This region must be page + aligned on start and end in order to properly allow + manipulation of the page attributes. - label : the name for the reserved partition, if omitted, the label is taken from the node name excluding the unit address. 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 diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 31983366090a..7a3ea89339b4 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -47,6 +47,7 @@ obj-$(CONFIG_INTEL_MEI) += mei/ obj-$(CONFIG_VMWARE_VMCI) += vmw_vmci/ obj-$(CONFIG_LATTICE_ECP3_CONFIG) += lattice-ecp3-config.o obj-$(CONFIG_SRAM) += sram.o +obj-$(CONFIG_SRAM_EXEC) += sram-exec.o obj-y += mic/ obj-$(CONFIG_GENWQE) += genwqe/ obj-$(CONFIG_ECHO) += echo/ diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c index 5a6e001845c2..d1185b78cf9a 100644 --- a/drivers/misc/sram.c +++ b/drivers/misc/sram.c @@ -122,6 +122,18 @@ static int sram_add_partition(struct sram_dev *sram, struct sram_reserve *block, if (ret) return ret; } + if (block->protect_exec) { + ret = sram_check_protect_exec(sram, block, part); + if (ret) + return ret; + + ret = sram_add_pool(sram, block, start, part); + if (ret) + return ret; + + sram_add_protect_exec(part); + } + sram->partitions++; return 0; @@ -207,7 +219,11 @@ static int sram_reserve_regions(struct sram_dev *sram, struct resource *res) if (of_find_property(child, "pool", NULL)) block->pool = true; - if ((block->export || block->pool) && block->size) { + if (of_find_property(child, "protect-exec", NULL)) + block->protect_exec = true; + + if ((block->export || block->pool || block->protect_exec) && + block->size) { exports++; label = NULL; @@ -269,7 +285,8 @@ static int sram_reserve_regions(struct sram_dev *sram, struct resource *res) goto err_chunks; } - if ((block->export || block->pool) && block->size) { + if ((block->export || block->pool || block->protect_exec) && + block->size) { ret = sram_add_partition(sram, block, res->start + block->start); if (ret) { diff --git a/drivers/misc/sram.h b/drivers/misc/sram.h index b268cd3f55bb..c181ce4c8fca 100644 --- a/drivers/misc/sram.h +++ b/drivers/misc/sram.h @@ -34,6 +34,7 @@ struct sram_reserve { u32 size; bool export; bool pool; + bool protect_exec; const char *label; }; |