x86: Add functions to convert between mtrr size and mask
Rather than repeating the same code in several places, add some
functions which can do the conversion.
Use the cpu_phys_address_size() function to obtain the physical-address
size, since it is more reliable with kvm, where the host CPU may have a
different value from the emulation CPU.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index 2e995f5..67e897d 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -91,6 +91,22 @@
};
/**
+ * mtrr_to_size() - Convert a mask to a size value
+ *
+ * @mask: Value of the mask register
+ * Return: associated size
+ */
+u64 mtrr_to_size(u64 mask);
+
+/**
+ * mtrr_to_mask() - Convert a size to a mask value
+ *
+ * @size: Value of the size register
+ * Return: associated mask, without MTRR_PHYS_MASK_VALID
+ */
+u64 mtrr_to_mask(u64 size);
+
+/**
* mtrr_open() - Prepare to adjust MTRRs
*
* Use mtrr_open() passing in a structure - this function will init it. Then