/* * Copyright 2007 Red Hat, Inc. * by Peter Jones <pjones@redhat.com> * Copyright 2007 IBM, Inc. * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com> * Copyright 2008 * by Konrad Rzeszutek <ketuzsezr@darnok.org> * * This code finds the iSCSI Boot Format Table. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License v2.0 as published by * the Free Software Foundation * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/bootmem.h> #include <linux/blkdev.h> #include <linux/ctype.h> #include <linux/device.h> #include <linux/err.h> #include <linux/init.h> #include <linux/limits.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/stat.h> #include <linux/string.h> #include <linux/types.h> #include <asm/mmzone.h> /* * Physical location of iSCSI Boot Format Table. */ struct ibft_table_header *ibft_addr; EXPORT_SYMBOL_GPL(ibft_addr); #define IBFT_SIGN "iBFT" #define IBFT_SIGN_LEN 4 #define IBFT_START 0x80000 /* 512kB */ #define IBFT_END 0x100000 /* 1MB */ #define VGA_MEM 0xA0000 /* VGA buffer */ #define VGA_SIZE 0x20000 /* 128kB */ /* * Routine used to find the iSCSI Boot Format Table. The logical * kernel address is set in the ibft_addr global variable. */ void __init reserve_ibft_region(void) { unsigned long pos; unsigned int len = 0; void *virt; ibft_addr = NULL; for (pos = IBFT_START; pos < IBFT_END; pos += 16) { /* The table can't be inside the VGA BIOS reserved space, * so skip that area */ if (pos == VGA_MEM) pos += VGA_SIZE; virt = phys_to_virt(pos); if (memcmp(virt, IBFT_SIGN, IBFT_SIGN_LEN) == 0) { unsigned long *addr = (unsigned long *)phys_to_virt(pos + 4); len = *addr; /* if the length of the table extends past 1M, * the table cannot be valid. */ if (pos + len <= (IBFT_END-1)) { ibft_addr = (struct ibft_table_header *)virt; break; } } } if (ibft_addr) reserve_bootmem(pos, PAGE_ALIGN(len), BOOTMEM_DEFAULT); }