efi/serial: fix serial re-init on x86_64

serial_init should be called after calling ExitBootServices

Change-Id: I2a04ee1eaf1d1fe9aaed3fa65b5521161ff74130
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8435
Reviewed-by: waddlesplash <[email protected]>
Haiku-Format: Haiku-format Bot <[email protected]>
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Fredrik Holmqvist <[email protected]>

src/system/boot/platform/efi/arch/x86_64/arch_start.cpp

@@ -145,9 +145,6 @@ arch_start_kernel(addr_t kernelEntry)
 	// entry.
 
 	dprintf("Calling ExitBootServices. So long, EFI!\n");
-
-	// Re-init and activate serial in a horrific post-EFI landscape. Clowns roam the land freely.
-	serial_init();
 	serial_disable();
 
 	while (true) {
@@ -169,7 +166,8 @@ arch_start_kernel(addr_t kernelEntry)
 	arch_mmu_post_efi_setup(memory_map_size, memory_map,
 		descriptor_size, descriptor_version);
 
-	// Restart serial. gUART only until we get into the kernel
+	// Re-init and activate serial in a horrific post-EFI landscape. Clowns roam the land freely.
+	serial_init();
 	serial_enable();
 
 	smp_boot_other_cpus(final_pml4, kernelEntry, (addr_t)&gKernelArgs);