Clean and document header files.

- Add missing doc comments to header files
- Move allocate_kernel_args to main.cpp
- Split functions out into pointer_manipulation.h

src/boot/memory.cpp

@@ -1,8 +1,9 @@
 #include <stddef.h>
 #include <uefi/types.h>
+#include "kernel_args.h"
 
-#include "error.h"
 #include "console.h"
+#include "error.h"
 #include "memory.h"
 
 namespace boot {
@@ -146,31 +147,6 @@ memory_virtualize(EFI_RUNTIME_SERVICES *runsvc, struct memory_map *map)
 }
 */
 
-kernel::args::header *
-allocate_args_structure(uefi::boot_services *bs, size_t max_modules)
-{
-	status_line status(L"Setting up kernel args memory");
-
-	kernel::args::header *args = nullptr;
-
-	size_t args_size =
-		sizeof(kernel::args::header) + // The header itself
-		max_modules * sizeof(kernel::args::module); // The module structures
-
-	try_or_raise(
-		bs->allocate_pool(args_type, args_size,
-			reinterpret_cast<void**>(&args)),
-		L"Could not allocate argument memory");
-
-	bs->set_mem(args, args_size, 0);
-
-	args->modules =
-		reinterpret_cast<kernel::args::module*>(args + 1);
-	args->num_modules = 0;
-
-	return args;
-}
-
 efi_mem_map
 get_mappings(uefi::boot_services *bs)
 {