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[RFC,02/10] arm64: introduce __kimg_to_phys() and __pa_symbol()

Message ID 1456174472-30028-3-git-send-email-ard.biesheuvel@linaro.org
State New
Headers show

Commit Message

Ard Biesheuvel Feb. 22, 2016, 8:54 p.m. UTC 
Before restricting the domain of __pa()'s argument to the linear mapping,
introduce alternatives __kimg_to_phys() and its alias __pa_symbol() [of
which the latter exists on x86 as well] that can be used to obtain the
physical address of a static object or function in the kernel text.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 arch/arm64/include/asm/memory.h | 3 +++
 1 file changed, 3 insertions(+)

-- 
2.5.0


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Patch

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 2296b32130a1..56d6739430f3 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -92,7 +92,10 @@ 
 				 (__x - kimage_voffset); })
 
 #define __phys_to_virt(x)	((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
+
+#define __kimg_to_phys(x)	((phys_addr_t)(x) - kimage_voffset)
 #define __phys_to_kimg(x)	((unsigned long)((x) + kimage_voffset))
+#define __pa_symbol(x)		__kimg_to_phys(x)
 
 /*
  * Convert a page to/from a physical address