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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2007-2010 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.
*/
#include <linux/memblock.h>
#include <linux/blkdev.h>
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/efi.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/limits.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/acpi.h>
#include <linux/iscsi_ibft.h>
#include <asm/mmzone.h>
/*
* Physical location of iSCSI Boot Format Table.
*/
phys_addr_t ibft_phys_addr;
EXPORT_SYMBOL_GPL(ibft_phys_addr);
static const struct {
char *sign;
} ibft_signs[] = {
{ "iBFT" },
{ "BIFT" }, /* Broadcom iSCSI Offload */
};
#define IBFT_SIGN_LEN 4
#define VGA_MEM 0xA0000 /* VGA buffer */
#define VGA_SIZE 0x20000 /* 128kB */
/*
* Routine used to find and reserve the iSCSI Boot Format Table
*/
void __init reserve_ibft_region(void)
{
unsigned long pos, virt_pos = 0;
unsigned int len = 0;
void *virt = NULL;
int i;
ibft_phys_addr = 0;
/* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will
* only use ACPI for this
*/
if (efi_enabled(EFI_BOOT))
return;
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;
/* Map page by page */
if (offset_in_page(pos) == 0) {
if (virt)
early_memunmap(virt, PAGE_SIZE);
virt = early_memremap_ro(pos, PAGE_SIZE);
virt_pos = pos;
}
for (i = 0; i < ARRAY_SIZE(ibft_signs); i++) {
if (memcmp(virt + (pos - virt_pos), ibft_signs[i].sign,
IBFT_SIGN_LEN) == 0) {
unsigned long *addr =
(unsigned long *)(virt + pos - 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_phys_addr = pos;
memblock_reserve(ibft_phys_addr, PAGE_ALIGN(len));
pr_info("iBFT found at %pa.\n", &ibft_phys_addr);
goto out;
}
}
}
}
out:
early_memunmap(virt, PAGE_SIZE);
}
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