2 * Copyright 2007 Red Hat, Inc.
3 * by Peter Jones <pjones@redhat.com>
4 * Copyright 2007 IBM, Inc.
5 * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
7 * by Konrad Rzeszutek <ketuzsezr@darnok.org>
9 * This code finds the iSCSI Boot Format Table.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License v2.0 as published by
13 * the Free Software Foundation
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
21 #include <linux/bootmem.h>
22 #include <linux/blkdev.h>
23 #include <linux/ctype.h>
24 #include <linux/device.h>
25 #include <linux/err.h>
26 #include <linux/init.h>
27 #include <linux/limits.h>
28 #include <linux/module.h>
29 #include <linux/pci.h>
30 #include <linux/slab.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/types.h>
35 #include <asm/mmzone.h>
38 * Physical location of iSCSI Boot Format Table.
40 struct ibft_table_header
*ibft_addr
;
41 EXPORT_SYMBOL_GPL(ibft_addr
);
43 #define IBFT_SIGN "iBFT"
44 #define IBFT_SIGN_LEN 4
45 #define IBFT_START 0x80000 /* 512kB */
46 #define IBFT_END 0x100000 /* 1MB */
47 #define VGA_MEM 0xA0000 /* VGA buffer */
48 #define VGA_SIZE 0x20000 /* 128kB */
52 * Routine used to find the iSCSI Boot Format Table. The logical
53 * kernel address is set in the ibft_addr global variable.
55 void __init
reserve_ibft_region(void)
63 for (pos
= IBFT_START
; pos
< IBFT_END
; pos
+= 16) {
64 /* The table can't be inside the VGA BIOS reserved space,
65 * so skip that area */
68 virt
= phys_to_virt(pos
);
69 if (memcmp(virt
, IBFT_SIGN
, IBFT_SIGN_LEN
) == 0) {
71 (unsigned long *)phys_to_virt(pos
+ 4);
73 /* if the length of the table extends past 1M,
74 * the table cannot be valid. */
75 if (pos
+ len
<= (IBFT_END
-1)) {
76 ibft_addr
= (struct ibft_table_header
*)virt
;
82 reserve_bootmem(pos
, PAGE_ALIGN(len
), BOOTMEM_DEFAULT
);
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