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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
.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)
#define LOGSTART 0
#define LOGCOUNT 1
#define BOOTSTART 1
#define BOOTCOUNT 2
/* 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) */
partition 0x00, 0xe0, LOGSTART, LOGCOUNT
/* Partition 4: boot partition */
partition 0x80, 0xeb, BOOTSTART, BOOTCOUNT
/* Disk signature */
.org 510
.byte 0x55, 0xaa
/* Skip to start of log partition */
.org CYLADDR(LOGSTART)
.ascii "iPXE LOG\n\n"
/* Skip to start of boot partition */
.org CYLADDR(BOOTSTART)
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