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drivers/firmware/iscsi_ibft_find.c
2.77 KB
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/* |
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* Copyright 2007-2010 Red Hat, Inc. |
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* 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> |
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#include <linux/efi.h> |
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#include <linux/err.h> #include <linux/init.h> #include <linux/limits.h> #include <linux/module.h> #include <linux/pci.h> |
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#include <linux/stat.h> #include <linux/string.h> #include <linux/types.h> |
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#include <linux/acpi.h> #include <linux/iscsi_ibft.h> |
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#include <asm/mmzone.h> /* * Physical location of iSCSI Boot Format Table. */ |
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struct acpi_table_ibft *ibft_addr; |
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EXPORT_SYMBOL_GPL(ibft_addr); |
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static const struct { char *sign; } ibft_signs[] = { |
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{ "iBFT" }, { "BIFT" }, /* Broadcom iSCSI Offload */ }; |
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#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 */ |
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static int __init find_ibft_in_mem(void) |
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{ unsigned long pos; unsigned int len = 0; void *virt; |
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int i; |
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|
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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; |
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virt = isa_bus_to_virt(pos); |
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for (i = 0; i < ARRAY_SIZE(ibft_signs); i++) { if (memcmp(virt, ibft_signs[i].sign, IBFT_SIGN_LEN) == 0) { unsigned long *addr = (unsigned long *)isa_bus_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 acpi_table_ibft *)virt; |
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pr_info("iBFT found at 0x%lx. ", pos); |
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goto done; } |
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} } } |
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done: |
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return len; } /* * Routine used to find the iSCSI Boot Format Table. The logical * kernel address is set in the ibft_addr global variable. */ unsigned long __init find_ibft_region(unsigned long *sizep) { |
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ibft_addr = NULL; |
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/* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will * only use ACPI for this */ |
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if (!efi_enabled(EFI_BOOT)) |
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find_ibft_in_mem(); |
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if (ibft_addr) { |
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*sizep = PAGE_ALIGN(ibft_addr->header.length); return (u64)isa_virt_to_bus(ibft_addr); |
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} *sizep = 0; return 0; |
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} |