Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / firmware / iscsi_ibft_find.c

diff --git a/kernel/drivers/firmware/iscsi_ibft_find.c b/kernel/drivers/firmware/iscsi_ibft_find.c
new file mode 100644 (file)
index 0000000..2224f1d
--- /dev/null
+++ b/kernel/drivers/firmware/iscsi_ibft_find.c
@@ -0,0 +1,112 @@
+/*
+ *  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.
+ *
+ * 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/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.
+ */
+struct acpi_table_ibft *ibft_addr;
+EXPORT_SYMBOL_GPL(ibft_addr);
+
+static const struct {
+       char *sign;
+} ibft_signs[] = {
+       { "iBFT" },
+       { "BIFT" },     /* Broadcom iSCSI Offload */
+};
+
+#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 */
+
+static int __init find_ibft_in_mem(void)
+{
+       unsigned long pos;
+       unsigned int len = 0;
+       void *virt;
+       int i;
+
+       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 = isa_bus_to_virt(pos);
+
+               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;
+                                       pr_info("iBFT found at 0x%lx.\n", pos);
+                                       goto done;
+                               }
+                       }
+               }
+       }
+done:
+       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)
+{
+       ibft_addr = NULL;
+
+       /* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will
+        * only use ACPI for this */
+
+       if (!efi_enabled(EFI_BOOT))
+               find_ibft_in_mem();
+
+       if (ibft_addr) {
+               *sizep = PAGE_ALIGN(ibft_addr->header.length);
+               return (u64)isa_virt_to_bus(ibft_addr);
+       }
+
+       *sizep = 0;
+       return 0;
+}