Add blue_screen and frame_buffer_console into the bootloader.

These can be used for on-screen debug output with relatively little
effort, as they just need a plain framebuffer definition to work.

Some stubs are added to not clutter up the kernel sources with too
many ifdefs.

src/system/boot/arch/arm/Jamfile

@@ -22,6 +22,11 @@ local kernelLibArchObjects =
 	<src!system!kernel!lib!arch!$(TARGET_ARCH)>memset.o
 ;
 
+local kernelDebugSources =
+	blue_screen.cpp
+	frame_buffer_console.cpp
+;
+
 BootMergeObject boot_arch_$(TARGET_KERNEL_ARCH).o :
 	debug_uart_8250.cpp
 	arch_uart_8250.cpp
@@ -33,6 +38,11 @@ BootMergeObject boot_arch_$(TARGET_KERNEL_ARCH).o :
 	arch_cpu.cpp
 	arch_mmu.cpp
 	arch_start_kernel.S
+
+	# Reuse a subset of kernel debugging.
+	kernel_stubs.cpp
+	$(kernelDebugSources)
+
 	$(librootArchObjects)
 	: -fno-pic
 	:
@@ -47,3 +57,6 @@ SEARCH on [ FGristFiles debug_uart_8250.cpp ]
 
 SEARCH on [ FGristFiles $(librootArchObjects) ]
 	= [ FDirName $(HAIKU_TOP) src system libroot posix string arch $(TARGET_ARCH) ] ;
+
+SEARCH on [ FGristFiles $(kernelDebugSources) ]
+	= [ FDirName $(HAIKU_TOP) src system kernel debug ] ;

src/system/boot/arch/arm/kernel_stubs.cpp

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2012 Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Michael Lotz, mmlr@mlotz.ch
+ */
+
+// This file just collects stubs that allow kernel sources to be used in the
+// bootloader more easily.
+
+#include <OS.h>
+#include <lock.h>
+
+
+extern "C" bool
+in_command_invocation()
+{
+	return false;
+}
+
+
+extern "C" void
+abort_debugger_command()
+{
+}
+
+
+extern "C" char
+kgetc()
+{
+	return -1;
+}
+
+
+extern "C" void
+spin(bigtime_t time)
+{
+}
+
+
+extern "C" status_t
+_mutex_lock(mutex*, bool)
+{
+	return true;
+}
+
+
+extern "C" void
+_mutex_unlock(mutex*, bool)
+{
+}
+

src/system/kernel/debug/blue_screen.cpp

@@ -568,6 +568,7 @@ parse_character(char c)
 }
 
 
+#ifndef _BOOT_MODE
 static int
 set_paging(int argc, char **argv)
 {
@@ -588,6 +589,7 @@ set_paging(int argc, char **argv)
 	kprintf("paging is turned %s now.\n", sScreen.paging ? "on" : "off");
 	return 0;
 }
+#endif // !_BOOT_MODE
 
 
 //	#pragma mark -
@@ -604,11 +606,15 @@ blue_screen_init(void)
 		return B_ERROR;
 
 	sModule = &gFrameBufferConsoleModule;
+#ifdef _BOOT_MODE
+	sScreen.paging = false;
+#else
 	sScreen.paging = !get_safemode_boolean(
 		"disable_onscreen_paging", false);
 	sScreen.paging_timeout = false;
 
 	add_debugger_command("paging", set_paging, "Enable or disable paging");
+#endif
 	return B_OK;
 }
 
@@ -659,6 +665,7 @@ blue_screen_clear_screen(void)
 }
 
 
+#ifndef _BOOT_MODE
 int
 blue_screen_try_getchar(void)
 {
@@ -671,6 +678,7 @@ blue_screen_getchar(void)
 {
 	return arch_debug_blue_screen_getchar();
 }
+#endif
 
 
 void

src/system/kernel/debug/frame_buffer_console.cpp

@@ -18,9 +18,12 @@
 #include <vm/vm.h>
 #include <fs/devfs.h>
 #include <boot/kernel_args.h>
+
+#ifndef _BOOT_MODE
 #include <vesa_info.h>
 
 #include <edid.h>
+#endif
 
 #include "font.h"
 
@@ -79,8 +82,11 @@ static uint32 sPalette32[] = {
 };
 
 static struct console_info sConsole;
+
+#ifndef _BOOT_MODE
 static struct frame_buffer_boot_info sBootInfo;
 static struct vesa_mode* sVesaModes;
+#endif
 
 
 static inline uint8
@@ -404,6 +410,7 @@ frame_buffer_update(addr_t baseAddress, int32 width, int32 height, int32 depth,
 }
 
 
+#ifndef _BOOT_MODE
 status_t
 frame_buffer_console_init(kernel_args* args)
 {
@@ -483,4 +490,5 @@ _user_frame_buffer_update(addr_t baseAddress, int32 width, int32 height,
 
 	return frame_buffer_update(baseAddress, width, height, depth, bytesPerRow);
 }
+#endif