EFI GUID Partition Table support

PATCH New [email protected] 1 participant 1 message Oct 25, 2000 Documentation

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2000-10-25 17:34 UTC #0 lore raw

PATCH 1/1 EFI GUID Partition Table support

Attached is my patch (against 2.4.0-test9) to add EFI GUID Partition Table support to the Linux kernel, specifically for IA-64. This code is licensed under the GPL.
To enable support, add CONFIG_EFI_PARTITION=y to your config files.

Special thanks to Andries Brouwer for his assistance in helping me to understand the kernel block device layer.

Please direct any feedback you have with about code to me.

Thanks,
Matt Domsch
Dell Enterprise Systems Group
Linux Development Team

<<linux-2.4.0-test9-efigpt-001025.patch>>

Documentation/Configure.help +6 -0

diff -burN linux-2.4.0-test9.orig/Documentation/Configure.help linux-2.4.0-test9-efigpt/Documentation/Configure.help
@@ -11279,6 +11279,12 @@
   Say Y here if you would like to be able to read the hard disk
   partition table format used by SGI machines.
 
+Intel EFI GUID partition support
+CONFIG_EFI_PARTITION
+  Say Y here if you would like to use hard disks under Linux which
+  were partitioned using EFI GPT.  Presently only useful on the
+  IA-64 platform.
+
 ADFS file system support (EXPERIMENTAL)
 CONFIG_ADFS_FS
   The Acorn Disc Filing System is the standard file system of the

fs/partitions/Config.in +1 -0

diff -burN linux-2.4.0-test9.orig/fs/partitions/Config.in linux-2.4.0-test9-efigpt/fs/partitions/Config.in
@@ -23,6 +23,7 @@
       bool '    BSD disklabel (FreeBSD partition tables) support' CONFIG_BSD_DISKLABEL
       bool '    Solaris (x86) partition table support' CONFIG_SOLARIS_X86_PARTITION
       bool '    Unixware slices support' CONFIG_UNIXWARE_DISKLABEL
+      bool '    EFI GUID Partition support' CONFIG_EFI_PARTITION
    fi
    bool '  SGI partition support' CONFIG_SGI_PARTITION
    bool '  Ultrix partition table support' CONFIG_ULTRIX_PARTITION

fs/partitions/Makefile +1 -0

diff -burN linux-2.4.0-test9.orig/fs/partitions/Makefile linux-2.4.0-test9-efigpt/fs/partitions/Makefile
@@ -20,6 +20,7 @@
 obj-$(CONFIG_SUN_PARTITION) += sun.o
 obj-$(CONFIG_ULTRIX_PARTITION) += ultrix.o
 obj-$(CONFIG_IBM_PARTITION) += ibm.o
+obj-$(CONFIG_EFI_PARTITION) += efi.o
 
 O_OBJS += $(obj-y)
 M_OBJS += $(obj-m)

fs/partitions/check.c +4 -0

diff -burN linux-2.4.0-test9.orig/fs/partitions/check.c linux-2.4.0-test9-efigpt/fs/partitions/check.c
@@ -32,6 +32,7 @@
 #include "sun.h"
 #include "ibm.h"
 #include "ultrix.h"
+#include "efi.h"
 
 extern void device_init(void);
 extern int *blk_size[];

@@ -71,6 +72,9 @@
 #endif
 #ifdef CONFIG_IBM_PARTITION
 	ibm_partition,
+#endif
+#ifdef CONFIG_EFI_PARTITION
+	efi_partition,
 #endif
 	NULL
 };

fs/partitions/efi.c +646 -0

646 lines not on this page · raw message

fs/partitions/efi.h +154 -0

154 lines not on this page · raw message

fs/partitions/msdos.c +14 -0

diff -burN linux-2.4.0-test9.orig/fs/partitions/msdos.c linux-2.4.0-test9-efigpt/fs/partitions/msdos.c
@@ -36,6 +36,10 @@
 #include "check.h"
 #include "msdos.h"
 
+#ifdef CONFIG_EFI_PARTITION
+#include "efi.h"
+#endif
+
 #if CONFIG_BLK_DEV_MD && CONFIG_AUTODETECT_RAID
 extern void md_autodetect_dev(kdev_t dev);
 #endif

@@ -378,6 +382,16 @@
 		bforget(bh);
 		return 0;
 	}
+#ifdef CONFIG_EFI_PARTITION
+	p = (struct partition *) (0x1be + data);
+	for (i=1 ; i<=4 ; i++,p++) {
+	  /* If this is an EFI GPT disk, msdos should ignore it. */
+	  if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
+	    bforget(bh);
+	    return 0;
+	  }
+	}
+#endif
 	p = (struct partition *) (0x1be + data);
 
 #ifdef CONFIG_BLK_DEV_IDE