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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-28 11:50:53 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-28 11:50:53 -0800 |
commit | d4f4cf77b37eaea58ef863a4cbc95dad3880b524 (patch) | |
tree | c1d6c963d55e7f9afaa4fc9a5c6d1438a43bb94d /arch/arm/mm/physaddr.c | |
parent | Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff) | |
parent | Merge branches 'fixes' and 'misc'; commit 'kuser^{/add CPU_THUMB_CAPABLE to indicate}' into for-linus (diff) | |
download | linux-dev-d4f4cf77b37eaea58ef863a4cbc95dad3880b524.tar.xz linux-dev-d4f4cf77b37eaea58ef863a4cbc95dad3880b524.zip |
Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
Pull ARM updates from Russell King:
- nommu updates from Afzal Mohammed cleaning up the vectors support
- allow DMA memory "mapping" for nommu Benjamin Gaignard
- fixing a correctness issue with R_ARM_PREL31 relocations in the
module linker
- add strlen() prototype for the decompressor
- support for DEBUG_VIRTUAL from Florian Fainelli
- adjusting memory bounds after memory reservations have been
registered
- unipher cache handling updates from Masahiro Yamada
- initrd and Thumb Kconfig cleanups
* 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: (23 commits)
ARM: mm: round the initrd reservation to page boundaries
ARM: mm: clean up initrd initialisation
ARM: mm: move initrd init code out of arm_memblock_init()
ARM: 8655/1: improve NOMMU definition of pgprot_*()
ARM: 8654/1: decompressor: add strlen prototype
ARM: 8652/1: cache-uniphier: clean up active way setup code
ARM: 8651/1: cache-uniphier: include <linux/errno.h> instead of <linux/types.h>
ARM: 8650/1: module: handle negative R_ARM_PREL31 addends correctly
ARM: 8649/2: nommu: remove Hivecs configuration is asm
ARM: 8648/2: nommu: display vectors base
ARM: 8647/2: nommu: dynamic exception base address setting
ARM: 8646/1: mmu: decouple VECTORS_BASE from Kconfig
ARM: 8644/1: Reduce "CPU: shutdown" message to debug level
ARM: 8641/1: treewide: Replace uses of virt_to_phys with __pa_symbol
ARM: 8640/1: Add support for CONFIG_DEBUG_VIRTUAL
ARM: 8639/1: Define KERNEL_START and KERNEL_END
ARM: 8638/1: mtd: lart: Rename partition defines to be prefixed with PART_
ARM: 8637/1: Adjust memory boundaries after reservations
ARM: 8636/1: Cleanup sanity_check_meminfo
ARM: add CPU_THUMB_CAPABLE to indicate possible Thumb support
...
Diffstat (limited to 'arch/arm/mm/physaddr.c')
-rw-r--r-- | arch/arm/mm/physaddr.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/arm/mm/physaddr.c b/arch/arm/mm/physaddr.c new file mode 100644 index 000000000000..02e60f495608 --- /dev/null +++ b/arch/arm/mm/physaddr.c @@ -0,0 +1,57 @@ +#include <linux/bug.h> +#include <linux/export.h> +#include <linux/types.h> +#include <linux/mmdebug.h> +#include <linux/mm.h> + +#include <asm/sections.h> +#include <asm/memory.h> +#include <asm/fixmap.h> +#include <asm/dma.h> + +#include "mm.h" + +static inline bool __virt_addr_valid(unsigned long x) +{ + /* + * high_memory does not get immediately defined, and there + * are early callers of __pa() against PAGE_OFFSET + */ + if (!high_memory && x >= PAGE_OFFSET) + return true; + + if (high_memory && x >= PAGE_OFFSET && x < (unsigned long)high_memory) + return true; + + /* + * MAX_DMA_ADDRESS is a virtual address that may not correspond to an + * actual physical address. Enough code relies on __pa(MAX_DMA_ADDRESS) + * that we just need to work around it and always return true. + */ + if (x == MAX_DMA_ADDRESS) + return true; + + return false; +} + +phys_addr_t __virt_to_phys(unsigned long x) +{ + WARN(!__virt_addr_valid(x), + "virt_to_phys used for non-linear address: %pK (%pS)\n", + (void *)x, (void *)x); + + return __virt_to_phys_nodebug(x); +} +EXPORT_SYMBOL(__virt_to_phys); + +phys_addr_t __phys_addr_symbol(unsigned long x) +{ + /* This is bounds checking against the kernel image only. + * __pa_symbol should only be used on kernel symbol addresses. + */ + VIRTUAL_BUG_ON(x < (unsigned long)KERNEL_START || + x > (unsigned long)KERNEL_END); + + return __pa_symbol_nodebug(x); +} +EXPORT_SYMBOL(__phys_addr_symbol); |