fix LLVM

+ Anything extern is right out as LLVM doesn't produce correct code for
  them. Maybe if I added some extra attributes but I'm skeptical.
  Replaced with static variables and getters/setters.

+ Inline ASM is apparently a bit buggy, so use an assembly stub when jumping to init.

+ Minimize work done in main() to minimize chance of LLVM doing something silly.
  Still not 100% certain that I shouldn't just write the main() as an assembly stub
  in arch/riscv64 to be absolutely sure everything works as intended.

+ Make .kernel.start section SHF_ALLOC, otherwise lld complains about
  pc-relative addressing

Probably some other stuff as well that I'm forgetting right now. But at least with
LLVM14 LTO seems to work, which is pretty cool?

1 files changed, 5 insertions, 1 deletions

diff --git a/include/arch/vmem.h b/include/arch/vmem.h
index e62c112..a19f555 100644
--- a/include/arch/vmem.h
+++ b/include/arch/vmem.h
@@ -148,10 +148,14 @@ vm_t setup_kernel_io(struct vmem *b, vm_t paddr);
  * address space and the kernel address space in the other.
  * Called at boot, not allowed to allocate memory.
  *
+ * @param load_addr Where in physical memory kernel was loaded to. Could in
+ * theory be fetched from \ref get_load_addr(), but the fewer globals are
+ * touched during initialization the better.
+ *
  * @return The vmem node used to build the address space. Probably statically
  * allocated.
  */
-struct vmem *init_mapping();
+struct vmem *init_mapping(uintptr_t load_addr);
 
 /**
  * Create new virtual memory space.