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, 12 insertions, 1 deletions

diff --git a/src/bkl.c b/src/bkl.c
index aa7bd53..6ee58f4 100644
--- a/src/bkl.c
+++ b/src/bkl.c
@@ -9,4 +9,15 @@
  * Instanciation of the big kernel lock.
  */
 
-spinlock_t bkl = 0;
+/** The Big Kernel Lock. */
+static spinlock_t bkl = 0;
+
+void bkl_lock()
+{
+	spin_lock(&bkl);
+}
+
+void bkl_unlock()
+{
+	spin_unlock(&bkl);
+}