Kernel: Add KString::must_{..} factory methods

There are a bunch of places like drivers which for all intense and
purposes can't really fail allocation during boot, and if they do
fail we should crash immediately.

This change adds `KString::must_create_uninitialized(..)` as well as
`KString::must_create(..)` for use during early boot initialization of
the Kernel. They enforce that they are only used during early boot.

1 files changed, 5 insertions, 0 deletions

diff --git a/Kernel/init.cpp b/Kernel/init.cpp
index 8be6e2d266..df56ae26e7 100644
--- a/Kernel/init.cpp
+++ b/Kernel/init.cpp
@@ -78,6 +78,7 @@ multiboot_module_entry_t multiboot_copy_boot_modules_array[16];
 size_t multiboot_copy_boot_modules_count;
 
 extern "C" const char kernel_cmdline[4096];
+bool g_in_early_boot;
 
 namespace Kernel {
 
@@ -111,6 +112,7 @@ extern "C" UNMAP_AFTER_INIT [[noreturn]] void init()
         asm volatile("cli;hlt");
     }
 
+    g_in_early_boot = true;
     setup_serial_debug();
 
     // We need to copy the command line before kmalloc is initialized,
@@ -271,6 +273,9 @@ void init_stage2(void*)
     // NOTE: Everything marked UNMAP_AFTER_INIT becomes inaccessible after this point.
     MM.unmap_memory_after_init();
 
+    // Switch out of early boot mode.
+    g_in_early_boot = false;
+
     int error;
 
     // FIXME: It would be nicer to set the mode from userspace.