Add __elfN(relocation_offset). It holds the offset between the virtual

(link) address and the physical (load) address. Ideally, the mapping
between link and load addresses should be abstracted by the copyin(),
copyout() and readin() functions, so that we don't have to add kluges
in __elfN(loadimage)(). Then, we could also have paged virtual memory
for the kernel. This can be important under EFI, where you need to
allocate physical memory form the firmware if you want to work in all
scenarios.

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/boot/common/bootstrap.h b/sys/boot/common/bootstrap.h
index 6ecd235..57982d1 100644
--- a/sys/boot/common/bootstrap.h
+++ b/sys/boot/common/bootstrap.h
@@ -233,13 +233,15 @@ void file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p)
 int  file_addmodule(struct preloaded_file *fp, char *modname, int version,
 	struct kernel_module **newmp);
 
-
 /* MI module loaders */
 #ifdef __elfN
 /* Relocation types. */
 #define ELF_RELOC_REL	1
 #define ELF_RELOC_RELA	2
 
+/* Relocation offset for some architectures */
+extern u_int64_t __elfN(relocation_offset);
+
 struct elf_file;
 typedef Elf_Addr (symaddr_fn)(struct elf_file *ef, Elf_Size symidx);