| Konrad Rzeszutek | 138fe4e | 2008-04-09 19:50:41 -0700 | [diff] [blame] | 1 | /* |
| 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> |
| 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> |
| 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> |
| 34 | |
| 35 | #include <asm/mmzone.h> |
| 36 | |
| 37 | /* |
| 38 | * Physical location of iSCSI Boot Format Table. |
| 39 | */ |
| 40 | struct ibft_table_header *ibft_addr; |
| 41 | EXPORT_SYMBOL_GPL(ibft_addr); |
| 42 | |
| 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 */ |
| 49 | |
| 50 | |
| 51 | /* |
| 52 | * Routine used to find the iSCSI Boot Format Table. The logical |
| 53 | * kernel address is set in the ibft_addr global variable. |
| 54 | */ |
| 55 | void __init reserve_ibft_region(void) |
| 56 | { |
| 57 | unsigned long pos; |
| 58 | unsigned int len = 0; |
| 59 | void *virt; |
| 60 | |
| Harvey Harrison | a01e035 | 2008-04-28 16:50:04 -0700 | [diff] [blame] | 61 | ibft_addr = NULL; |
| Konrad Rzeszutek | 138fe4e | 2008-04-09 19:50:41 -0700 | [diff] [blame] | 62 | |
| 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 */ |
| 66 | if (pos == VGA_MEM) |
| 67 | pos += VGA_SIZE; |
| 68 | virt = phys_to_virt(pos); |
| 69 | if (memcmp(virt, IBFT_SIGN, IBFT_SIGN_LEN) == 0) { |
| 70 | unsigned long *addr = |
| 71 | (unsigned long *)phys_to_virt(pos + 4); |
| 72 | len = *addr; |
| 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; |
| 77 | break; |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | if (ibft_addr) |
| 82 | reserve_bootmem(pos, PAGE_ALIGN(len), BOOTMEM_DEFAULT); |
| 83 | } |