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authorPeter Jones <pjones@redhat.com>2010-02-25 23:37:17 +0300
committerKonrad Rzeszutek Wilk <konrad@kernel.org>2010-05-11 21:02:23 +0400
commit4e639fdf0d0d745648aa62228ab8a0d9c03a563f (patch)
treec6cb611ffc6f3e17e10ca3f39ac00f0e39b1ee4b /drivers/firmware/iscsi_ibft_find.c
parent94b849aaf6e22ab7bf54b0d0377a882d4892396d (diff)
downloadlinux-4e639fdf0d0d745648aa62228ab8a0d9c03a563f.tar.xz
ibft: Update iBFT handling for v1.03 of the spec.
- Use struct acpi_table_ibft instead of struct ibft_table_header - Don't do reserve_ibft_region() on UEFI machines (section 1.4.3.1) - If ibft_addr isn't initialized when ibft_init() is called, check for ACPI-based tables. - Fix compiler error when CONFIG_ACPI is not defined. Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org> Signed-off-by: Peter Jones <pjones@redhat.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Diffstat (limited to 'drivers/firmware/iscsi_ibft_find.c')
-rw-r--r--drivers/firmware/iscsi_ibft_find.c35
1 files changed, 30 insertions, 5 deletions
diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c
index d6470ef36e4a..dd85555d3296 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"
@@ -46,6 +49,13 @@ 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
@@ -59,6 +69,11 @@ 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)
+ return 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 */
@@ -72,14 +87,24 @@ 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;
}
}
}
+#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", acpi_find_ibft);
+#endif /* CONFIG_ACPI */
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;