X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=kitten%2Farch%2Fx86_64%2Fmm%2Fphys_addr.c;fp=kitten%2Farch%2Fx86_64%2Fmm%2Fphys_addr.c;h=90e609702f8a1fd2b8189ddd00377f7fe347fddd;hb=6299cb929a586fd8debcc316c1ede714d5b95979;hp=0000000000000000000000000000000000000000;hpb=e9e3ee43cb302909917b5919f6043347b73c6995;p=palacios.git

diff --git a/kitten/arch/x86_64/mm/phys_addr.c b/kitten/arch/x86_64/mm/phys_addr.c
new file mode 100644
index 0000000..90e6097
--- /dev/null
+++ b/kitten/arch/x86_64/mm/phys_addr.c
@@ -0,0 +1,21 @@
+#include <arch/page.h>
+
+extern unsigned long phys_base;
+
+/**
+ * This converts a kernel virtual address to a physical address.
+ *
+ * NOTE: This function only works for kernel virtual addresses in the kernel's
+ *       identity mapping of all of physical memory. It will not work for the
+ *       fixmap, vmalloc() areas, or any other type of virtual address.
+ */
+unsigned long
+__phys_addr(unsigned long virt_addr)
+{
+	/* Handle kernel symbols */
+	if (virt_addr >= __START_KERNEL_map)
+		return virt_addr - __START_KERNEL_map + phys_base;
+	/* Handle kernel data */
+	return virt_addr - PAGE_OFFSET;
+}
+