mirror of
https://gitlab.com/qemu-project/ipxe.git
synced 2025-11-03 07:59:06 +08:00
e17568ad06
Signed-off-by: Geert Stappers <stappers@stappers.it> Modified-by: Michael Brown <mcb30@ipxe.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
80 lines
1.7 KiB
ArmAsm
80 lines
1.7 KiB
ArmAsm
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
|
|
|
|
#include <config/console.h>
|
|
|
|
.section ".note.GNU-stack", "", @progbits
|
|
.text
|
|
.arch i386
|
|
.section ".prefix", "awx", @progbits
|
|
.code16
|
|
.org 0
|
|
|
|
#include "mbr.S"
|
|
|
|
/* Partition table: 64 heads, 32 sectors/track (ZIP-drive compatible) */
|
|
#define HEADS 64
|
|
#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
|
|
.byte \head
|
|
.byte (((\cylinder & 0x300) >> 2) | \sector)
|
|
.byte (\cylinder & 0x0ff)
|
|
.endm
|
|
|
|
/* Construct a linear address */
|
|
.macro linear cylinders, heads, sectors
|
|
.long ((((\cylinders * HEADS) + \heads) * SECTORS) + \sectors - 1)
|
|
.endm
|
|
|
|
/* Construct a partition table entry */
|
|
.macro partition bootflag, type, start, count
|
|
.byte \bootflag
|
|
chs \start, ((\start == 0) & 1), 1
|
|
.byte \type
|
|
chs (\start + \count - 1), (HEADS - 1), SECTORS
|
|
linear \start, ((\start == 0) & 1), 1
|
|
linear \count, 0, (1 - (((\start == 0) & 1) * SECTORS))
|
|
.endm
|
|
|
|
/* Partition table */
|
|
.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
|
|
|
|
/* Disk signature */
|
|
.org 510
|
|
.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)
|