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138fe4e0 | 1 | /* |
4e639fdf | 2 | * Copyright 2007-2010 Red Hat, Inc. |
138fe4e0 KR |
3 | * by Peter Jones <pjones@redhat.com> |
4 | * Copyright 2007 IBM, Inc. | |
5 | * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com> | |
6 | * Copyright 2008 | |
7 | * by Konrad Rzeszutek <ketuzsezr@darnok.org> | |
8 | * | |
9 | * This code finds the iSCSI Boot Format Table. | |
10 | * | |
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 | |
14 | * | |
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. | |
19 | */ | |
20 | ||
21 | #include <linux/bootmem.h> | |
22 | #include <linux/blkdev.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/device.h> | |
4e639fdf | 25 | #include <linux/efi.h> |
138fe4e0 KR |
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> | |
138fe4e0 KR |
31 | #include <linux/stat.h> |
32 | #include <linux/string.h> | |
33 | #include <linux/types.h> | |
4e639fdf PJ |
34 | #include <linux/acpi.h> |
35 | #include <linux/iscsi_ibft.h> | |
138fe4e0 KR |
36 | |
37 | #include <asm/mmzone.h> | |
38 | ||
39 | /* | |
40 | * Physical location of iSCSI Boot Format Table. | |
41 | */ | |
4e639fdf | 42 | struct acpi_table_ibft *ibft_addr; |
138fe4e0 KR |
43 | EXPORT_SYMBOL_GPL(ibft_addr); |
44 | ||
45 | #define IBFT_SIGN "iBFT" | |
46 | #define IBFT_SIGN_LEN 4 | |
47 | #define IBFT_START 0x80000 /* 512kB */ | |
48 | #define IBFT_END 0x100000 /* 1MB */ | |
49 | #define VGA_MEM 0xA0000 /* VGA buffer */ | |
50 | #define VGA_SIZE 0x20000 /* 128kB */ | |
51 | ||
4e639fdf PJ |
52 | #ifdef CONFIG_ACPI |
53 | static int __init acpi_find_ibft(struct acpi_table_header *header) | |
54 | { | |
55 | ibft_addr = (struct acpi_table_ibft *)header; | |
56 | return 0; | |
57 | } | |
58 | #endif /* CONFIG_ACPI */ | |
138fe4e0 KR |
59 | |
60 | /* | |
61 | * Routine used to find the iSCSI Boot Format Table. The logical | |
62 | * kernel address is set in the ibft_addr global variable. | |
63 | */ | |
042be38e | 64 | unsigned long __init find_ibft_region(unsigned long *sizep) |
138fe4e0 KR |
65 | { |
66 | unsigned long pos; | |
67 | unsigned int len = 0; | |
68 | void *virt; | |
69 | ||
a01e035e | 70 | ibft_addr = NULL; |
138fe4e0 | 71 | |
4e639fdf PJ |
72 | /* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will |
73 | * only use ACPI for this */ | |
74 | if (efi_enabled) | |
75 | return 0; | |
76 | ||
138fe4e0 KR |
77 | for (pos = IBFT_START; pos < IBFT_END; pos += 16) { |
78 | /* The table can't be inside the VGA BIOS reserved space, | |
79 | * so skip that area */ | |
80 | if (pos == VGA_MEM) | |
81 | pos += VGA_SIZE; | |
ed3c6614 | 82 | virt = isa_bus_to_virt(pos); |
138fe4e0 KR |
83 | if (memcmp(virt, IBFT_SIGN, IBFT_SIGN_LEN) == 0) { |
84 | unsigned long *addr = | |
ed3c6614 | 85 | (unsigned long *)isa_bus_to_virt(pos + 4); |
138fe4e0 KR |
86 | len = *addr; |
87 | /* if the length of the table extends past 1M, | |
88 | * the table cannot be valid. */ | |
89 | if (pos + len <= (IBFT_END-1)) { | |
4e639fdf | 90 | ibft_addr = (struct acpi_table_ibft *)virt; |
138fe4e0 KR |
91 | break; |
92 | } | |
93 | } | |
94 | } | |
4e639fdf PJ |
95 | #ifdef CONFIG_ACPI |
96 | /* | |
97 | * One spec says "IBFT", the other says "iBFT". We have to check | |
98 | * for both. | |
99 | */ | |
100 | if (!ibft_addr) | |
101 | acpi_table_parse(ACPI_SIG_IBFT, acpi_find_ibft); | |
102 | if (!ibft_addr) | |
103 | acpi_table_parse("iBFT", acpi_find_ibft); | |
104 | #endif /* CONFIG_ACPI */ | |
042be38e | 105 | if (ibft_addr) { |
4e639fdf PJ |
106 | *sizep = PAGE_ALIGN(ibft_addr->header.length); |
107 | return (u64)isa_virt_to_bus(ibft_addr); | |
042be38e YL |
108 | } |
109 | ||
110 | *sizep = 0; | |
111 | return 0; | |
138fe4e0 | 112 | } |