Support booting with a packaged boot loader

* Add new package haiku_loader.hpkg and move haiku_loader there. The
  package is built without compression, so that the stage 1 boot loader
  has a chance of loading it.
* Adjust the stage 1 boot loader to load the haiku_loader package and
  relocate the boot loader code accordingly.

build/jam/HaikuImage

@@ -197,10 +197,11 @@ SYSTEM_ADD_ONS_FILE_SYSTEMS = bfs bindfs btrfs cdda exfat ext2 fat iso9660 nfs
 	googlefs ;
 
 
-# build the haiku system package and add it
+# build the haiku system packages and add them
 include [ FDirName $(HAIKU_BUILD_RULES_DIR) HaikuPackages ] ;
 
 AddPackageFilesToHaikuImage system : haiku.hpkg ;
+AddPackageFilesToHaikuImage system : haiku_loader.hpkg ;
 
 
 AddSymlinkToHaikuImage . : /boot/common/apps ;
@@ -315,9 +316,6 @@ SEARCH on <post-install>fresh_install
 	= [ FDirName $(HAIKU_TOP) data common settings ] ;
 AddFilesToHaikuImage common settings : <post-install>fresh_install ;
 
-# boot loader
-AddFilesToHaikuImage system : haiku_loader ;
-
 # decorators
 AddDirectoryToHaikuImage home config non-packaged add-ons decorators ;
 #AddFilesToHaikuImage home config add-ons decorators : ;

build/jam/HaikuPackages

@@ -4,6 +4,7 @@ local packages =
 	Haiku
 	HaikuCrossDevel
 	HaikuDevel
+	HaikuLoader
 	HaikuUserguide
 	HaikuWelcome
 	MakefileEngine

build/jam/packages/Haiku

@@ -280,9 +280,6 @@ SEARCH on $(thinkPadFiles) = $(thinkpadDir) ;
 AddFilesToPackage data KeyboardLayouts ThinkPad
 	: $(thinkPadFiles) ;
 
-# boot loader
-AddFilesToPackage : haiku_loader ;
-
 # boot module links
 AddBootModuleSymlinksToPackage
 	acpi@x86 ata@ata pci isa@x86 config_manager dpc

build/jam/packages/HaikuLoader

@@ -0,0 +1,13 @@
+local haikuLoaderPackage = haiku_loader.hpkg ;
+HaikuPackage $(haikuLoaderPackage) ;
+
+
+# boot loader
+AddFilesToPackage : haiku_loader ;
+
+
+# Force no compression, so the stage one loader can directly execute the boot
+# loader.
+HAIKU_PACKAGE_COMPRESSION_LEVEL on $(haikuLoaderPackage) = 0 ;
+
+BuildHaikuPackage $(haikuLoaderPackage) : haiku_loader ;