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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/firmware/iscsi_ibft_find.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/firmware/iscsi_ibft_find.c')
-rw-r--r--drivers/firmware/iscsi_ibft_find.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c
new file mode 100644
index 0000000000..71f51303c2
--- /dev/null
+++ b/drivers/firmware/iscsi_ibft_find.c
@@ -0,0 +1,100 @@
+// 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);
+}