1 files changed, 84 insertions, 0 deletions

diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c
new file mode 100644
index 000000000000..d0e5fa4ea51b
--- /dev/null
+++ b/drivers/firmware/iscsi_ibft_find.c
@@ -0,0 +1,84 @@
+/*
+ *  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 = 0;
+
+        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);
+}
+EXPORT_SYMBOL_GPL(reserve_ibft_region);