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[int13con] Create log partition only when CONSOLE_INT13 is enabled 

Reduce the size of the USB disk image in the common case that
CONSOLE_INT13 is not enabled.

Originally-implemented-by: Romain Guyard <romain.guyard@mujin.co.jp>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/107/head
Michael Brown 2020-03-01 12:56:28 +00:00
parent 49319f1bc9
commit efc1ae5aba
1 changed files with 17 additions and 0 deletions
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17
src/arch/x86/prefix/usbdisk.S
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@ -1,5 +1,7 @@
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
#include <config/console.h>
.text
.arch i386
.section ".prefix", "awx", @progbits
@ -13,10 +15,17 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
#define SECTORS 32
#define CYLADDR(cyl) ((((cyl) * HEADS + (((cyl) == 0) & 1)) * SECTORS) * 512)
#ifdef CONSOLE_INT13
#define LOGPART 1
#define LOGSTART 0
#define LOGCOUNT 1
#define BOOTSTART 1
#define BOOTCOUNT 2
#else /* CONSOLE_INT13 */
#define LOGPART 0
#define BOOTSTART 0
#define BOOTCOUNT 2
#endif /* CONSOLE_INT13 */
/* Construct a C/H/S address */
.macro chs cylinder, head, sector
@ -44,8 +53,14 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
.org 446
.space 16
.space 16
/* Partition 3: log partition (for CONSOLE_INT13) */
.if LOGPART
partition 0x00, 0xe0, LOGSTART, LOGCOUNT
.else
.space 16
.endif
/* Partition 4: boot partition */
partition 0x80, 0xeb, BOOTSTART, BOOTCOUNT
@ -54,8 +69,10 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
.byte 0x55, 0xaa
/* Skip to start of log partition */
.if LOGPART
.org CYLADDR(LOGSTART)
.ascii "iPXE LOG\n\n"
.endif
/* Skip to start of boot partition */
.org CYLADDR(BOOTSTART)