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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 | ||
14036350 MC |
45 | static const struct { |
46 | char *sign; | |
47 | } ibft_signs[] = { | |
48 | #ifdef CONFIG_ACPI | |
49 | /* | |
50 | * One spec says "IBFT", the other says "iBFT". We have to check | |
51 | * for both. | |
52 | */ | |
53 | { ACPI_SIG_IBFT }, | |
54 | #endif | |
55 | { "iBFT" }, | |
56 | { "BIFT" }, /* Broadcom iSCSI Offload */ | |
57 | }; | |
58 | ||
138fe4e0 KR |
59 | #define IBFT_SIGN_LEN 4 |
60 | #define IBFT_START 0x80000 /* 512kB */ | |
61 | #define IBFT_END 0x100000 /* 1MB */ | |
62 | #define VGA_MEM 0xA0000 /* VGA buffer */ | |
63 | #define VGA_SIZE 0x20000 /* 128kB */ | |
64 | ||
4e639fdf PJ |
65 | #ifdef CONFIG_ACPI |
66 | static int __init acpi_find_ibft(struct acpi_table_header *header) | |
67 | { | |
68 | ibft_addr = (struct acpi_table_ibft *)header; | |
69 | return 0; | |
70 | } | |
71 | #endif /* CONFIG_ACPI */ | |
138fe4e0 | 72 | |
1303a35b | 73 | static int __init find_ibft_in_mem(void) |
138fe4e0 KR |
74 | { |
75 | unsigned long pos; | |
76 | unsigned int len = 0; | |
77 | void *virt; | |
14036350 | 78 | int i; |
138fe4e0 | 79 | |
138fe4e0 KR |
80 | for (pos = IBFT_START; pos < IBFT_END; pos += 16) { |
81 | /* The table can't be inside the VGA BIOS reserved space, | |
82 | * so skip that area */ | |
83 | if (pos == VGA_MEM) | |
84 | pos += VGA_SIZE; | |
ed3c6614 | 85 | virt = isa_bus_to_virt(pos); |
14036350 MC |
86 | |
87 | for (i = 0; i < ARRAY_SIZE(ibft_signs); i++) { | |
88 | if (memcmp(virt, ibft_signs[i].sign, IBFT_SIGN_LEN) == | |
89 | 0) { | |
90 | unsigned long *addr = | |
91 | (unsigned long *)isa_bus_to_virt(pos + 4); | |
92 | len = *addr; | |
93 | /* if the length of the table extends past 1M, | |
94 | * the table cannot be valid. */ | |
95 | if (pos + len <= (IBFT_END-1)) { | |
96 | ibft_addr = (struct acpi_table_ibft *)virt; | |
97 | goto done; | |
98 | } | |
138fe4e0 KR |
99 | } |
100 | } | |
101 | } | |
14036350 | 102 | done: |
1303a35b KRW |
103 | return len; |
104 | } | |
105 | /* | |
106 | * Routine used to find the iSCSI Boot Format Table. The logical | |
107 | * kernel address is set in the ibft_addr global variable. | |
108 | */ | |
109 | unsigned long __init find_ibft_region(unsigned long *sizep) | |
110 | { | |
7f20caff | 111 | #ifdef CONFIG_ACPI |
14036350 | 112 | int i; |
7f20caff | 113 | #endif |
1303a35b KRW |
114 | ibft_addr = NULL; |
115 | ||
4e639fdf | 116 | #ifdef CONFIG_ACPI |
14036350 MC |
117 | for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) |
118 | acpi_table_parse(ibft_signs[i].sign, acpi_find_ibft); | |
4e639fdf | 119 | #endif /* CONFIG_ACPI */ |
1303a35b KRW |
120 | |
121 | /* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will | |
122 | * only use ACPI for this */ | |
123 | ||
124 | if (!ibft_addr && !efi_enabled) | |
125 | find_ibft_in_mem(); | |
126 | ||
042be38e | 127 | if (ibft_addr) { |
4e639fdf PJ |
128 | *sizep = PAGE_ALIGN(ibft_addr->header.length); |
129 | return (u64)isa_virt_to_bus(ibft_addr); | |
042be38e YL |
130 | } |
131 | ||
132 | *sizep = 0; | |
133 | return 0; | |
138fe4e0 | 134 | } |