2 * Copyright 2007-2010 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/efi.h>
26 #include <linux/err.h>
27 #include <linux/init.h>
28 #include <linux/limits.h>
29 #include <linux/module.h>
30 #include <linux/pci.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/types.h>
34 #include <linux/acpi.h>
35 #include <linux/iscsi_ibft.h>
37 #include <asm/mmzone.h>
40 * Physical location of iSCSI Boot Format Table.
42 struct acpi_table_ibft
*ibft_addr
;
43 EXPORT_SYMBOL_GPL(ibft_addr
);
49 { "BIFT" }, /* Broadcom iSCSI Offload */
52 #define IBFT_SIGN_LEN 4
53 #define IBFT_START 0x80000 /* 512kB */
54 #define IBFT_END 0x100000 /* 1MB */
55 #define VGA_MEM 0xA0000 /* VGA buffer */
56 #define VGA_SIZE 0x20000 /* 128kB */
58 static int __init
find_ibft_in_mem(void)
65 for (pos
= IBFT_START
; pos
< IBFT_END
; pos
+= 16) {
66 /* The table can't be inside the VGA BIOS reserved space,
67 * so skip that area */
70 virt
= isa_bus_to_virt(pos
);
72 for (i
= 0; i
< ARRAY_SIZE(ibft_signs
); i
++) {
73 if (memcmp(virt
, ibft_signs
[i
].sign
, IBFT_SIGN_LEN
) ==
76 (unsigned long *)isa_bus_to_virt(pos
+ 4);
78 /* if the length of the table extends past 1M,
79 * the table cannot be valid. */
80 if (pos
+ len
<= (IBFT_END
-1)) {
81 ibft_addr
= (struct acpi_table_ibft
*)virt
;
82 pr_info("iBFT found at 0x%lx.\n", pos
);
92 * Routine used to find the iSCSI Boot Format Table. The logical
93 * kernel address is set in the ibft_addr global variable.
95 unsigned long __init
find_ibft_region(unsigned long *sizep
)
99 /* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will
100 * only use ACPI for this */
106 *sizep
= PAGE_ALIGN(ibft_addr
->header
.length
);
107 return (u64
)isa_virt_to_bus(ibft_addr
);
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