From 664d8f66849ede9af30ccba90c9070220c474eb4 Mon Sep 17 00:00:00 2001
From: Gene Cumm <gene.cumm@gmail.com>
Date: Sun, 27 Mar 2011 08:36:19 -0400
Subject: diag/mbr/handoff: Add optional printing of floppy descriptor

---
 diag/mbr/handoff.S | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'diag/mbr/handoff.S')

diff --git a/diag/mbr/handoff.S b/diag/mbr/handoff.S
index 2ac0cccb..7af3fdeb 100644
--- a/diag/mbr/handoff.S
+++ b/diag/mbr/handoff.S
@@ -56,6 +56,7 @@
 #define DEBUG_PNP	/* Scan for $PnP and show address */
 #define DEBUG_PAK	/* Press Any Key before boot fail */
 // #define DEBUG_ENTRY_REG	/* Store (manually as pusha is 80186) registers */
+// #define DEBUG_FDT	/* Print the floppy descriptor table; INT 1Eh*/
 
 #ifdef DEBUG_MARKER1
 	.macro ASCII_MARKER1 s:vararg
@@ -108,6 +109,10 @@ es_bot		= (es_ds)
 
 BIOS_page	= 0x462
 
+int_1e		= (4*0x1e)
+int_1e_seg	= (int_1e)
+int_1e_off	= (int_1e+2)
+
 	.globl	_start
 _start:
 	cli
@@ -247,6 +252,27 @@ pr_pnp:
 	call	crlf
 pnp_end:
 
+#ifdef DEBUG_FDT
+	/* INT 1Eh: Floppy Parameter Table Pointer */
+pr_1e:	call	wrstr
+	.ascii	"INT 1Eh: \0"
+	mov	$int_1e,%bx
+	les	(%bx),%di
+	pushw	%es
+	popw	%dx
+	call	wrhexw
+	movb	$':, %al
+	call	wrchr
+	pushw	%di
+	popw	%dx
+	call	wrhexw
+	call	crlf
+	/* [INT 1Eh] */
+	movw	$14, %cx
+	call	wrhexbses
+	call	crlf
+#endif	/* DEBUG_FDT */
+
 end:
 	jmp	bootfail
 
-- 
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