core: Reimplement lots asm code in C

There is an awful lot of code currently implemented in assembly when
it could just as easily be implemented in C. Having it in C makes it
much easier to share code between the BIOS and forthcoming EFI
firmware backend. The following code fragments have been rewritten,

  - timer initialisation
  - adjust_screen()
  - check_esapes() and mem_init()
  - conio.inc
  - plaincon.inc
  - cleanup.inc
  - serirq.inc
  - font.inc
  - graphics
  - writehex

Signed-off-by: Matt Fleming <matt.fleming@intel.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/core/cleanup.c b/core/cleanup.c
new file mode 100644
index 00000000..7bf1df2e
--- /dev/null
+++ b/core/cleanup.c
@@ -0,0 +1,46 @@
+/* -----------------------------------------------------------------------
+ *
+ *   Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+ *   Boston MA 02111-1307, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * -----------------------------------------------------------------------
+ */
+#include <com32.h>
+#include <core.h>
+
+extern void timer_cleanup(void);
+extern void comboot_cleanup_api(void);
+
+/*
+ * cleanup.c
+ *
+ * Some final tidying before jumping to a kernel or bootsector
+ */
+
+/*
+ * cleanup_hardware:
+ *
+ *	Shut down anything transient.
+ */
+void cleanup_hardware(void)
+{
+	/*
+	 * TODO
+	 *
+	 * Linux wants the floppy motor shut off before starting the
+	 * kernel, at least bootsect.S seems to imply so.  If we don't
+	 * load the floppy driver, this is *definitely* so!
+	 */
+	__intcall(0x13, &zero_regs, NULL);
+
+	call16(comboot_cleanup_api, &zero_regs, NULL);
+	call16(timer_cleanup, &zero_regs, NULL);
+
+	/* If we enabled serial port interrupts, clean them up now */
+	sirq_cleanup();
+}