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d9523678 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
138fe4e0 | 2 | /* |
4e639fdf | 3 | * Copyright 2007-2010 Red Hat, Inc. |
138fe4e0 KR |
4 | * by Peter Jones <pjones@redhat.com> |
5 | * Copyright 2007 IBM, Inc. | |
6 | * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com> | |
7 | * Copyright 2008 | |
8 | * by Konrad Rzeszutek <ketuzsezr@darnok.org> | |
9 | * | |
10 | * This code finds the iSCSI Boot Format Table. | |
138fe4e0 KR |
11 | */ |
12 | ||
57c8a661 | 13 | #include <linux/memblock.h> |
138fe4e0 KR |
14 | #include <linux/blkdev.h> |
15 | #include <linux/ctype.h> | |
16 | #include <linux/device.h> | |
4e639fdf | 17 | #include <linux/efi.h> |
138fe4e0 KR |
18 | #include <linux/err.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/limits.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/pci.h> | |
138fe4e0 KR |
23 | #include <linux/stat.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/types.h> | |
4e639fdf PJ |
26 | #include <linux/acpi.h> |
27 | #include <linux/iscsi_ibft.h> | |
138fe4e0 KR |
28 | |
29 | #include <asm/mmzone.h> | |
30 | ||
31 | /* | |
32 | * Physical location of iSCSI Boot Format Table. | |
33 | */ | |
342f43af ML |
34 | phys_addr_t ibft_phys_addr; |
35 | EXPORT_SYMBOL_GPL(ibft_phys_addr); | |
138fe4e0 | 36 | |
14036350 MC |
37 | static const struct { |
38 | char *sign; | |
39 | } ibft_signs[] = { | |
14036350 MC |
40 | { "iBFT" }, |
41 | { "BIFT" }, /* Broadcom iSCSI Offload */ | |
42 | }; | |
43 | ||
138fe4e0 KR |
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 */ | |
49 | ||
342f43af ML |
50 | /* |
51 | * Routine used to find and reserve the iSCSI Boot Format Table | |
52 | */ | |
53 | void __init reserve_ibft_region(void) | |
138fe4e0 KR |
54 | { |
55 | unsigned long pos; | |
56 | unsigned int len = 0; | |
57 | void *virt; | |
14036350 | 58 | int i; |
138fe4e0 | 59 | |
342f43af ML |
60 | ibft_phys_addr = 0; |
61 | ||
62 | /* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will | |
63 | * only use ACPI for this | |
64 | */ | |
65 | if (efi_enabled(EFI_BOOT)) | |
66 | return; | |
67 | ||
138fe4e0 KR |
68 | for (pos = IBFT_START; pos < IBFT_END; pos += 16) { |
69 | /* The table can't be inside the VGA BIOS reserved space, | |
70 | * so skip that area */ | |
71 | if (pos == VGA_MEM) | |
72 | pos += VGA_SIZE; | |
ed3c6614 | 73 | virt = isa_bus_to_virt(pos); |
14036350 MC |
74 | |
75 | for (i = 0; i < ARRAY_SIZE(ibft_signs); i++) { | |
76 | if (memcmp(virt, ibft_signs[i].sign, IBFT_SIGN_LEN) == | |
77 | 0) { | |
78 | unsigned long *addr = | |
79 | (unsigned long *)isa_bus_to_virt(pos + 4); | |
80 | len = *addr; | |
81 | /* if the length of the table extends past 1M, | |
82 | * the table cannot be valid. */ | |
83 | if (pos + len <= (IBFT_END-1)) { | |
342f43af ML |
84 | ibft_phys_addr = pos; |
85 | memblock_reserve(ibft_phys_addr, PAGE_ALIGN(len)); | |
7fd1d00b | 86 | pr_info("iBFT found at %pa.\n", &ibft_phys_addr); |
342f43af | 87 | return; |
14036350 | 88 | } |
138fe4e0 KR |
89 | } |
90 | } | |
91 | } | |
138fe4e0 | 92 | } |