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path: root/drivers/firmware/iscsi_ibft_find.c
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Diffstat (limited to 'drivers/firmware/iscsi_ibft_find.c')
-rw-r--r--drivers/firmware/iscsi_ibft_find.c56
1 files changed, 44 insertions, 12 deletions
diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c
index d6470ef36e4..2192456dfd6 100644
--- a/drivers/firmware/iscsi_ibft_find.c
+++ b/drivers/firmware/iscsi_ibft_find.c
@@ -1,5 +1,5 @@
/*
- * Copyright 2007 Red Hat, Inc.
+ * Copyright 2007-2010 Red Hat, Inc.
* by Peter Jones <pjones@redhat.com>
* Copyright 2007 IBM, Inc.
* by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
@@ -22,6 +22,7 @@
#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>
@@ -30,13 +31,15 @@
#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 ibft_table_header *ibft_addr;
+struct acpi_table_ibft *ibft_addr;
EXPORT_SYMBOL_GPL(ibft_addr);
#define IBFT_SIGN "iBFT"
@@ -46,19 +49,20 @@ EXPORT_SYMBOL_GPL(ibft_addr);
#define VGA_MEM 0xA0000 /* VGA buffer */
#define VGA_SIZE 0x20000 /* 128kB */
+#ifdef CONFIG_ACPI
+static int __init acpi_find_ibft(struct acpi_table_header *header)
+{
+ ibft_addr = (struct acpi_table_ibft *)header;
+ return 0;
+}
+#endif /* CONFIG_ACPI */
-/*
- * 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)
+static int __init find_ibft_in_mem(void)
{
unsigned long pos;
unsigned int len = 0;
void *virt;
- ibft_addr = NULL;
-
for (pos = IBFT_START; pos < IBFT_END; pos += 16) {
/* The table can't be inside the VGA BIOS reserved space,
* so skip that area */
@@ -72,14 +76,42 @@ unsigned long __init find_ibft_region(unsigned long *sizep)
/* 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;
+ ibft_addr = (struct acpi_table_ibft *)virt;
break;
}
}
}
+ 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;
+
+#ifdef CONFIG_ACPI
+ /*
+ * One spec says "IBFT", the other says "iBFT". We have to check
+ * for both.
+ */
+ if (!ibft_addr)
+ acpi_table_parse(ACPI_SIG_IBFT, acpi_find_ibft);
+ if (!ibft_addr)
+ acpi_table_parse(IBFT_SIGN, acpi_find_ibft);
+#endif /* CONFIG_ACPI */
+
+ /* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will
+ * only use ACPI for this */
+
+ if (!ibft_addr && !efi_enabled)
+ find_ibft_in_mem();
+
if (ibft_addr) {
- *sizep = PAGE_ALIGN(len);
- return pos;
+ *sizep = PAGE_ALIGN(ibft_addr->header.length);
+ return (u64)isa_virt_to_bus(ibft_addr);
}
*sizep = 0;