fix: Leave .bss initialization of loader to firmware

Overriding the own bss after load is problematic if items are already in
use. The firmware that loads and jumps into the loader should zero the
.bss already.

Signed-off-by: Martin Kröning <martin.kroening@eonerc.rwth-aachen.de>

src/arch/aarch64/link.ld

@@ -36,10 +36,8 @@ SECTIONS
     *(.data.*)
   } :segment_rw
   .bss    : ALIGN(8) {
-    bss_start = .;
     *(.bss)
     *(.bss.*)
-    bss_end = .;
   } :segment_rw
   . = ALIGN(4K); /* Align to page boundary */
   /***********************************************************************************************

src/arch/x86_64/link.ld

@@ -22,10 +22,8 @@ SECTIONS
     *(.data.*)
   }
   .bss ALIGN(4096) : AT(ADDR(.bss)) {
-    bss_start = .;
     *(.bss)
     *(.bss.*)
   }
-  bss_end = .;
   kernel_end = .;
 }

src/arch/x86_64/link_fc.ld

@@ -21,10 +21,8 @@ SECTIONS
     *(.data.*)
   }
   .bss ALIGN(4096) : AT(ADDR(.bss)) {
-    bss_start = .;
     *(.bss)
     *(.bss.*)
   }
-  bss_end = .;
   kernel_end = .;
 }

src/none.rs

@@ -38,19 +38,6 @@ unsafe extern "C" fn loader_main() -> ! {
 	arch::boot_kernel(kernel_info)
 }
 
-unsafe fn init_bss() {
-	extern "C" {
-		static mut bss_start: MaybeUninit<u8>;
-		static mut bss_end: MaybeUninit<u8>;
-	}
-
-	let start_ptr = addr_of_mut!(bss_start);
-	let end_ptr = addr_of_mut!(bss_end);
-	let len = end_ptr.offset_from(start_ptr).try_into().unwrap();
-	let slice = slice::from_raw_parts_mut(start_ptr, len);
-	slice.fill(MaybeUninit::new(0));
-}
-
 #[panic_handler]
 fn panic(info: &core::panic::PanicInfo<'_>) -> ! {
 	// We can't use `println!` or related macros, because `_print` unwraps a result and might panic again