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92 lines
2.1 KiB
92 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2007-2010 Red Hat, Inc. |
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* by Peter Jones <[email protected]> |
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* Copyright 2007 IBM, Inc. |
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* by Konrad Rzeszutek <[email protected]> |
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* Copyright 2008 |
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* by Konrad Rzeszutek <[email protected]> |
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* |
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* This code finds the iSCSI Boot Format Table. |
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*/ |
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#include <linux/memblock.h> |
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#include <linux/blkdev.h> |
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#include <linux/ctype.h> |
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#include <linux/device.h> |
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#include <linux/efi.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/limits.h> |
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#include <linux/module.h> |
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#include <linux/pci.h> |
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#include <linux/stat.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <linux/acpi.h> |
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#include <linux/iscsi_ibft.h> |
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#include <asm/mmzone.h> |
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/* |
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* Physical location of iSCSI Boot Format Table. |
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*/ |
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phys_addr_t ibft_phys_addr; |
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EXPORT_SYMBOL_GPL(ibft_phys_addr); |
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static const struct { |
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char *sign; |
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} ibft_signs[] = { |
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{ "iBFT" }, |
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{ "BIFT" }, /* Broadcom iSCSI Offload */ |
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}; |
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#define IBFT_SIGN_LEN 4 |
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#define IBFT_START 0x80000 /* 512kB */ |
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#define IBFT_END 0x100000 /* 1MB */ |
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#define VGA_MEM 0xA0000 /* VGA buffer */ |
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#define VGA_SIZE 0x20000 /* 128kB */ |
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/* |
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* Routine used to find and reserve the iSCSI Boot Format Table |
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*/ |
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void __init reserve_ibft_region(void) |
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{ |
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unsigned long pos; |
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unsigned int len = 0; |
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void *virt; |
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int i; |
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ibft_phys_addr = 0; |
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/* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will |
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* only use ACPI for this |
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*/ |
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if (efi_enabled(EFI_BOOT)) |
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return; |
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for (pos = IBFT_START; pos < IBFT_END; pos += 16) { |
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/* The table can't be inside the VGA BIOS reserved space, |
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* so skip that area */ |
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if (pos == VGA_MEM) |
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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++) { |
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if (memcmp(virt, ibft_signs[i].sign, IBFT_SIGN_LEN) == |
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0) { |
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unsigned long *addr = |
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(unsigned long *)isa_bus_to_virt(pos + 4); |
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len = *addr; |
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/* if the length of the table extends past 1M, |
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* the table cannot be valid. */ |
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if (pos + len <= (IBFT_END-1)) { |
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ibft_phys_addr = pos; |
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memblock_reserve(ibft_phys_addr, PAGE_ALIGN(len)); |
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pr_info("iBFT found at %pa.\n", &ibft_phys_addr); |
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return; |
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} |
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} |
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} |
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} |
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}
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