On Wed, Nov 02, 2016 at 03:00:54PM -0600, Laura Abbott wrote:
> +CFLAGS_physaddr.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
> +obj-$(CONFIG_DEBUG_VIRTUAL) += physaddr.o
> diff --git a/arch/arm64/mm/physaddr.c b/arch/arm64/mm/physaddr.c
> new file mode 100644
> index 0000000..874c782
> --- /dev/null
> +++ b/arch/arm64/mm/physaddr.c
> @@ -0,0 +1,34 @@
> +#include <linux/mm.h>
> +
> +#include <asm/memory.h>
> +
> +unsigned long __virt_to_phys(unsigned long x)
> +{
> + phys_addr_t __x = (phys_addr_t)x;
> +
> + if (__x & BIT(VA_BITS - 1)) {
> + /*
> + * The linear kernel range starts in the middle of the virtual
> + * adddress space. Testing the top bit for the start of the
> + * region is a sufficient check.
> + */
> + return (__x & ~PAGE_OFFSET) + PHYS_OFFSET;
> + } else {
> + VIRTUAL_BUG_ON(x < kimage_vaddr || x >= (unsigned long)_end);
> + return (__x - kimage_voffset);
> + }
> +}
> +EXPORT_SYMBOL(__virt_to_phys);
> +
> +unsigned long __phys_addr_symbol(unsigned long x)
> +{
> + phys_addr_t __x = (phys_addr_t)x;
> +
> + /*
> + * This is intentionally different than above to be a tighter check
> + * for symbols.
> + */
> + VIRTUAL_BUG_ON(x < kimage_vaddr + TEXT_OFFSET || x > (unsigned long) _end);
Can't we use _text instead of kimage_vaddr + TEXT_OFFSET? That way we don't
need CFLAGS_physaddr.o.
Or KERNEL_START / KERNEL_END from <asm/memory.h>?
Otherwise, this looks good to me (though I haven't grokked the need for
__pa_symbol() yet).
Thanks,
Mark.
> + return (__x - kimage_voffset);
> +}
> +EXPORT_SYMBOL(__phys_addr_symbol);
> --
> 2.10.1
>
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