preserve a magic number used by Windows NT.

ChangeLog

@@ -1,3 +1,23 @@
+2000-08-27  OKUJI Yoshinori  <okuji@gnu.org>
+
+	Preserve a magic number used by Windows NT in a MBR. Shit!
+	Reported by Khimenko Victor.
+	
+	* stage1/stage1.h (STAGE1_WINDOWS_NT_MAGIC): New macro.
+	* stage1/stage1.S (copy_buffer): Use pusha and popa, instead of
+	pushing/poping %cx and %si separately, to reduce the code size.
+	(nt_magic): New label. Set the offset to _start plus
+	STAGE1_WINDOWS_NT_MAGIC
+	(part_start): New label.
+	* stage2/builtins.c (install_func): If DEST_DRIVE is a hard
+	disk, copy the possible partition table and Windows NT magic to
+	STAGE1_BUFFER from OLD_SECT.
+	
+2000-08-26  OKUJI Yoshinori  <okuji@gnu.org>
+
+	* stage2/char_io.c (translate_keycode) [SUPPORT_SERIAL]: Don't
+	drain the input buffer, since that was irritating.
+	
 2000-08-26  OKUJI Yoshinori  <okuji@gnu.org>
 
 	Don't save/restore fragile registers unnecessarily.

NEWS

@@ -24,6 +24,7 @@ New in 0.5.96 - XXXX-XX-XX:
   a new option `--enable-serial'. If it is specified, you can use two
   new commands, "serial" and "terminal" in the command-line and the
   menu. See the manual, for more details.
+* Preserve the possible magic number used by Windows NT in a MBR.
 
 New in 0.5.95 - 2000-06-27:
 * NetBSD ELF kernel support is added. You have to specify the new option

stage1/stage1.S

@@ -344,9 +344,8 @@ copy_buffer:
 	 * We need to save %cx and %si because the startup code in
 	 * stage2 uses them without initializing them.
 	 */
-	pushw	%cx
+	pusha
 	pushw	%ds
-	pushw	%si
 	
 	movw	$0x100, %cx
 	movw	%bx, %ds
@@ -358,9 +357,8 @@ copy_buffer:
 	rep
 	movsw
 
-	popw	%si
 	popw	%ds
-	popw	%cx
+	popa
 
 	/* boot stage2 */
 	jmp	*(stage2_address)
@@ -420,12 +418,21 @@ message:
 	jne	1b	/* if not end of string, jmp to display */
 	ret
 
+	/*
+	 *  Windows NT breaks the compatibility by embedding a magic
+	 *  number here.
+	 */
+
+nt_magic:	
+	. = _start + STAGE1_WINDOWS_NT_MAGIC
+	
 	/*
 	 *  This is where an MBR would go if on a hard disk.  The code
 	 *  here isn't even referenced unless we're on a floppy.  Kinda
 	 *  sneaky, huh?
 	 */
 
+part_start:	
 	. = _start + STAGE1_PARTSTART
 
 probe_values:

stage1/stage1.h

@@ -1,6 +1,6 @@
 /*
  *  GRUB  --  GRand Unified Bootloader
- *  Copyright (C) 1999   Free Software Foundation, Inc.
+ *  Copyright (C) 1999, 2000   Free Software Foundation, Inc.
  *
  *  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
@@ -51,6 +51,9 @@
 /* The offset of STAGE2_SEGMENT.  */
 #define STAGE1_STAGE2_SEGMENT	0x48
 
+/* The offset of a magic number used by Windows NT.  */
+#define STAGE1_WINDOWS_NT_MAGIC	0x1b8
+
 /* The offset of the start of the partition table.  */
 #define STAGE1_PARTSTART	0x1be
 

stage2/builtins.c

@@ -1625,10 +1625,10 @@ install_func (char *arg, int flags)
 		BOOTSEC_BPB_LENGTH);
 
   /* If for a hard disk, copy the possible MBR/extended part table.  */
-  if ((dest_drive & 0x80) && current_partition == 0xFFFFFF)
+  if (dest_drive & 0x80)
-    grub_memmove (stage1_buffer + BOOTSEC_PART_OFFSET,
+    grub_memmove (stage1_buffer + STAGE1_WINDOWS_NT_MAGIC,
-		  old_sect + BOOTSEC_PART_OFFSET,
+		  old_sect + STAGE1_WINDOWS_NT_MAGIC,
-		  BOOTSEC_PART_LENGTH);
+		  STAGE1_PARTEND - STAGE1_WINDOWS_NT_MAGIC);
 
   /* Check for the version and the signature of Stage 1.  */
   if (*((short *)(stage1_buffer + STAGE1_VER_MAJ_OFFS)) != COMPAT_VERSION

stage2/char_io.c

@@ -668,12 +668,6 @@ translate_keycode (int c)
 		  break;
 		}
 	    }
-
-	  /* Drain the input buffer, because so-called VT100-compatible
-	     terminals could send key codes which aren't handled in the
-	     code above.  */
-	  while (checkkey () != -1)
-	    (void) getkey ();
 	}
     }
   else

stage2/serial.c

@@ -45,6 +45,10 @@ static struct divisor divisor_tab[] =
   { 115200, 0x0001 }
 };
 
+/* The position of the cursor.  */
+int serial_x;
+int serial_y;
+
 
 /* Read a byte from a port.  */
 static inline unsigned char

stage2/serial.h

@@ -65,6 +65,13 @@
 /* Turn on DTR, RTS, and OUT2.  */
 #define UART_ENABLE_MODEM	0x0B
 
+
+/* Variable prototypes.  */
+
+/* In the serial terminal, trace the cursor in GRUB itself.  */
+extern int serial_x;
+extern int serial_y;
+
 
 /* Function prototypes.  */
 

stage2/stage2.c

@@ -122,9 +122,9 @@ print_border (int y, int size)
   
 #ifndef GRUB_UTIL
   /* Color the menu. The menu is 75 * 14 characters.  */
-#ifdef SUPPORT_SERIAL
+# ifdef SUPPORT_SERIAL
   if (terminal & TERMINAL_CONSOLE)
-#endif
+# endif
     {
       for (i = 0; i < 14; i++)
 	{