[gPXE] [PATCH 2/4] [prefix] Remove unsupported .com prefix

[Stefan Hajnoczi]

The DOS .com prefix was brought over from legacy Etherboot but does not
build.  There has been no demand for .com images so this patch removes
the prefix.

Signed-off-by: Stefan Hajnoczi <stefanha at gmail.com>
---
 src/arch/i386/Makefile.pcbios    |    1 -
 src/arch/i386/prefix/comprefix.S |   46 --------------------------------------
 2 files changed, 0 insertions(+), 47 deletions(-)
 delete mode 100644 src/arch/i386/prefix/comprefix.S

diff --git a/src/arch/i386/Makefile.pcbios b/src/arch/i386/Makefile.pcbios
index 3ebfc0c..ba153e9 100644
--- a/src/arch/i386/Makefile.pcbios
+++ b/src/arch/i386/Makefile.pcbios
@@ -25,7 +25,6 @@ MEDIA		+= dsk
 MEDIA		+= nbi
 MEDIA		+= hd
 MEDIA		+= raw
-MEDIA		+= com
 MEDIA		+= exe
 
 # Padding rules
diff --git a/src/arch/i386/prefix/comprefix.S b/src/arch/i386/prefix/comprefix.S
deleted file mode 100644
index 2cbbca5..0000000
--- a/src/arch/i386/prefix/comprefix.S
+++ /dev/null
@@ -1,46 +0,0 @@
-/* We need a real mode stack that won't be stomped on by Etherboot
-   which starts at 0x20000. Choose something that's sufficiently high,
-   but not in DOC territory. Note that we couldn't do this in a real
-   .com program since stack variables are in the same segment as the
-   code and data, but this isn't really a .com program, it just looks
-   like one to make DOS load it into memory. It still has the 64kB
-   limitation of .com files though. */
-#define STACK_SEG	0x7000
-#define STACK_SIZE	0x4000
-
-	.text
-	.code16
-	.arch i386
-	.section ".prefix", "ax", @progbits
-
-/* Cheat a little with the relocations: .COM files are loaded at 0x100 */
-_prefix:
-	/* Set up temporary stack */ 
-	movw	$STACK_SEG, %ax
-	movw	%ax, %ss
-	movw	$STACK_SIZE, %sp
-
-	pushl	$0	/* No parameters to preserve for exit path */
-	pushw	$0	/* Dummy return address - use prefix_exit */
-
-	/* Calculate segment address of image start */
-	pushw	%cs
-	popw	%ax
-	addw	$(0x100/16), %ax
-	pushw	%ax
-	pushw	$_start
-	/* Calculated lcall to _start with %cs:0000 = image start */
-	lret
-
-	.section ".text16", "ax", @progbits
-prefix_exit:
-	movw	$0x4c00,%ax		/* return to DOS */
-	int	$0x21			/* reach this on Quit */
-prefix_exit_end:
-	.previous
-
-/* The body of etherboot is attached here at build time.
- * Force 16 byte alignment
- */
-	.align 16,0
-_body: 
-- 
1.6.5