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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-10-19 23:06:36 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-10-19 23:06:36 +0200 |
| commit | 809b4e00baf006a990a73329ba381d536c6fa277 (patch) | |
| tree | e949e0efd019d6f932537aba762792b07a84351c /arch/arm/mm/mmap.c | |
| parent | Merge branch 'hotplug' into devel (diff) | |
| parent | Merge branch 'for-rmk' of git://git.pengutronix.de/git/imx/linux-2.6 into dev... (diff) | |
| download | linux-809b4e00baf006a990a73329ba381d536c6fa277.tar.xz linux-809b4e00baf006a990a73329ba381d536c6fa277.zip | |
Merge branch 'devel-stable' into devel
Diffstat (limited to 'arch/arm/mm/mmap.c')
| -rw-r--r-- | arch/arm/mm/mmap.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index 4f5b39687df5..b0a98305055c 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -144,3 +144,25 @@ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size) { return !(pfn + (size >> PAGE_SHIFT) > 0x00100000); } + +#ifdef CONFIG_STRICT_DEVMEM + +#include <linux/ioport.h> + +/* + * devmem_is_allowed() checks to see if /dev/mem access to a certain + * address is valid. The argument is a physical page number. + * We mimic x86 here by disallowing access to system RAM as well as + * device-exclusive MMIO regions. This effectively disable read()/write() + * on /dev/mem. + */ +int devmem_is_allowed(unsigned long pfn) +{ + if (iomem_is_exclusive(pfn << PAGE_SHIFT)) + return 0; + if (!page_is_ram(pfn)) + return 1; + return 0; +} + +#endif |