From 1a14b474415a15b4c75400eda67c9ef00895f0d1 Mon Sep 17 00:00:00 2001

From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>

Date: Sun, 14 Apr 2013 18:53:14 +0200

Subject: [PATCH 308/482] 	Move GRUB out of system area when using

 xorriso 1.2.9 or later.

---

 ChangeLog                       |   4 +

 grub-core/Makefile.core.def     |  13 +++

 grub-core/boot/i386/pc/boot.S   | 194 +++++++++++++++++++++++++---------------

 grub-core/boot/i386/pc/cdboot.S |   5 +-

 util/grub-mkrescue.in           |  23 +++--

 5 files changed, 159 insertions(+), 80 deletions(-)

diff --git a/ChangeLog b/ChangeLog

index 60effd3..fc3dd51 100644

--- a/ChangeLog

+++ b/ChangeLog

@@ -1,5 +1,9 @@

 2013-04-14  Vladimir Serbinenko  <phcoder@gmail.com>

+	Move GRUB out of system area when using xorriso 1.2.9 or later.

+

+2013-04-14  Vladimir Serbinenko  <phcoder@gmail.com>

+

 	* tests/grub_cmd_date.in: Add missing exit 1.

 2013-04-14  Vladimir Serbinenko  <phcoder@gmail.com>

diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def

index f1f1012..459e566 100644

--- a/grub-core/Makefile.core.def

+++ b/grub-core/Makefile.core.def

@@ -282,6 +282,19 @@ image = {

 };

 image = {

+  name = boot_hybrid;

+  i386_pc = boot/i386/pc/boot.S;

+

+  cppflags = '-DHYBRID_BOOT=1';

+  

+  i386_pc_ldflags = '$(TARGET_IMG_LDFLAGS)';

+  i386_pc_ldflags = '$(TARGET_IMG_BASE_LDOPT),0x7C00';

+

+  objcopyflags = '-O binary';

+  enable = i386_pc;

+};

+

+image = {

   name = cdboot;

   i386_pc = boot/i386/pc/cdboot.S;

diff --git a/grub-core/boot/i386/pc/boot.S b/grub-core/boot/i386/pc/boot.S

index 314f140..c0880c6 100644

--- a/grub-core/boot/i386/pc/boot.S

+++ b/grub-core/boot/i386/pc/boot.S

@@ -28,6 +28,81 @@

 #define MSG(x)	movw $x, %si; call LOCAL(message)

 #define ERR(x)	movw $x, %si; jmp LOCAL(error_message)

+	.macro floppy

+part_start:

+

+probe_values:

+	.byte	36, 18, 15, 9, 0

+

+LOCAL(floppy_probe):

+/*

+ *  Perform floppy probe.

+ */

+

+	movw	$probe_values - 1, %si

+

+LOCAL(probe_loop):

+	/* reset floppy controller INT 13h AH=0 */

+	xorw	%ax, %ax

+	int	$0x13

+

+	incw	%si

+	movb	(%si), %cl

+

+	/* if number of sectors is 0, display error and die */

+	cmpb	$0, %cl

+	jne	1f

+

+/*

+ * Floppy disk probe failure.

+ */

+	MSG(fd_probe_error_string)

+	jmp	LOCAL(general_error)

+

+/* "Floppy" */

+fd_probe_error_string:	.asciz "Floppy"

+

+1:

+	/* perform read */

+	movw	$GRUB_BOOT_MACHINE_BUFFER_SEG, %bx

+	movw	%bx, %es

+	xorw	%bx, %bx

+	movw	$0x201, %ax

+	movb	$0, %ch

+	movb	$0, %dh

+	int	$0x13

+

+	/* if error, jump to "LOCAL(probe_loop)" */

+	jc	LOCAL(probe_loop)

+

+	/* %cl is already the correct value! */

+	movb	$1, %dh

+	movb	$79, %ch

+

+	jmp	LOCAL(final_init)

+	.endm

+

+	.macro scratch

+

+	/* scratch space */

+mode:

+	.byte	0

+disk_address_packet:

+sectors:

+	.long	0

+heads:

+	.long	0

+cylinders:

+	.word	0

+sector_start:

+	.byte	0

+head_start:

+	.byte	0

+cylinder_start:

+	.word	0

+	/* more space... */

+	.endm

+

 	.file	"boot.S"

 	.text

@@ -51,6 +126,34 @@ start:

 	jmp	LOCAL(after_BPB)

 	nop	/* do I care about this ??? */

+#ifdef HYBRID_BOOT

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+	nop

+

+	nop

+	nop

+	jmp	LOCAL(after_BPB)

+#else

 	/*

 	 * This space is for the BIOS parameter block!!!!  Don't change

 	 * the first jump, nor start the code anywhere but right after

@@ -59,27 +162,14 @@ start:

 	. = _start + GRUB_BOOT_MACHINE_BPB_START

 	. = _start + 4

-

-	/* scratch space */

-mode:

-	.byte	0

-disk_address_packet:

-sectors:

-	.long	0

-heads:

-	.long	0

-cylinders:

-	.word	0

-sector_start:

-	.byte	0

-head_start:

-	.byte	0

-cylinder_start:

-	.word	0

-	/* more space... */

+#endif

+#ifdef HYBRID_BOOT

+	floppy

+#else

+	scratch

+#endif

 	. = _start + GRUB_BOOT_MACHINE_BPB_END

-

 	/*

 	 * End of BIOS parameter block.

 	 */

@@ -87,9 +177,11 @@ cylinder_start:

 kernel_address:

 	.word	GRUB_BOOT_MACHINE_KERNEL_ADDR

+#ifndef HYBRID_BOOT

 	. = _start + GRUB_BOOT_MACHINE_KERNEL_SECTOR

 kernel_sector:

 	.long	1, 0

+#endif

 	. = _start + GRUB_BOOT_MACHINE_BOOT_DRIVE

 boot_drive:

@@ -410,6 +502,11 @@ LOCAL(message):

 	 *  number here.

 	 */

+#ifdef HYBRID_BOOT

+	. = _start + 0x1b0

+kernel_sector:

+	.long	1, 0

+#endif

 	. = _start + GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC

 nt_magic:

 	.long 0

@@ -419,62 +516,17 @@ nt_magic:

 	 *  This is where an MBR would go if on a hard disk.  The code

 	 *  here isn't even referenced unless we're on a floppy.  Kinda

 	 *  sneaky, huh?

-	 */

+	*/

 	. = _start + GRUB_BOOT_MACHINE_PART_START

-part_start:

-

-probe_values:

-	.byte	36, 18, 15, 9, 0

-

-LOCAL(floppy_probe):

-/*

- *  Perform floppy probe.

- */

-

-	movw	$probe_values - 1, %si

-

-LOCAL(probe_loop):

-	/* reset floppy controller INT 13h AH=0 */

-	xorw	%ax, %ax

-	int	$0x13

-

-	incw	%si

-	movb	(%si), %cl

-

-	/* if number of sectors is 0, display error and die */

-	cmpb	$0, %cl

-	jne	1f

-

-/*

- * Floppy disk probe failure.

- */

-	MSG(fd_probe_error_string)

-	jmp	LOCAL(general_error)

-

-/* "Floppy" */

-fd_probe_error_string:	.asciz "Floppy"

-

-1:

-	/* perform read */

-	movw	$GRUB_BOOT_MACHINE_BUFFER_SEG, %bx

-	movw	%bx, %es

-	xorw	%bx, %bx

-	movw	$0x201, %ax

-	movb	$0, %ch

-	movb	$0, %dh

-	int	$0x13

-	/* if error, jump to "LOCAL(probe_loop)" */

-	jc	LOCAL(probe_loop)

-

-	/* %cl is already the correct value! */

-	movb	$1, %dh

-	movb	$79, %ch

-

-	jmp	LOCAL(final_init)

+#ifndef HYBRID_BOOT

+	floppy

+#else

+	scratch

+#endif

 	. = _start + GRUB_BOOT_MACHINE_PART_END

-

+	

 /* the last 2 bytes in the sector 0 contain the signature */

 	.word	GRUB_BOOT_MACHINE_SIGNATURE

diff --git a/grub-core/boot/i386/pc/cdboot.S b/grub-core/boot/i386/pc/cdboot.S

index d939835..92df7c7 100644

--- a/grub-core/boot/i386/pc/cdboot.S

+++ b/grub-core/boot/i386/pc/cdboot.S

@@ -93,11 +93,12 @@ LOCAL(read_cdrom):

 	pushw	$CDBLK_LENG

 	/* Block number.  */

+	incl    %esi

 	pushl	%eax

 	pushl	%esi

 	/* Buffer address.  */

-	pushw	$((DATA_ADDR - 0x400)>> 4)

+	pushw	$((DATA_ADDR - 0x200)>> 4)

 	pushl	%eax

 	pushw	$0x10

@@ -167,6 +168,6 @@ err_noboot_msg:

 err_cdfail_msg:

 	.ascii	"cdrom read fails\0"

-	. = start + 0x1FF

+	. = start + 0x7FF

 	.byte	0

diff --git a/util/grub-mkrescue.in b/util/grub-mkrescue.in

index c74c8ca..b97d674 100644

--- a/util/grub-mkrescue.in

+++ b/util/grub-mkrescue.in

@@ -365,15 +365,25 @@ if test -e "${pc_dir}" ; then

         iso9660 biosdisk

     cat "${pc_dir}/cdboot.img" "${core_img}" > "${iso9660_dir}/boot/grub/i386-pc/eltorito.img"

-    embed_img="`mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX"`" || exit 1

-    cat "${pc_dir}/boot.img" "${core_img}" > "${embed_img}"

-

-    rm -f "${core_img}"

-

     grub_mkisofs_arguments="${grub_mkisofs_arguments} -b boot/grub/i386-pc/eltorito.img -no-emul-boot -boot-load-size 4 -boot-info-table"

     if [ "$system_area" = common ]; then

-	grub_mkisofs_arguments="--embedded-boot ${embed_img}"

+	if "${xorriso}" -as mkisofs -help 2>&1 | fgrep "grub2-boot-info" >/dev/null; then

+	    grub_mkisofs_arguments="${grub_mkisofs_arguments} --grub2-boot-info --grub2-mbr ${pc_dir}/boot_hybrid.img"

+	else

+	    gettext "Your xorriso doesn't support \`--grub2-boot-info'. Some features are disabled. Please use xorriso 1.2.9 or later."

+	    echo

+	    sysarea_img="`mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX"`" || exit 1

+	    cat "${pc_dir}/boot.img" "${core_img}" > "${sysarea_img}"

+	    if [ "$(wc -c "${sysarea_img}" | awk '{ print $1; }')" -gt 32768 ]; then

+		gettext "Your xorriso doesn't support \`--grub2-boot-info'. Your core image is too big. Boot as disk is disabled. Please use xorriso 1.2.9 or later."

+		echo

+	    else

+		grub_mkisofs_arguments="${grub_mkisofs_arguments} -G ${sysarea_img}"

+	    fi

+	fi

     fi

+

+    rm -f "${core_img}"

 fi

 # build multiboot core.img

@@ -495,6 +505,5 @@ fi

 rm -rf "${iso9660_dir}"

 rm -f "${sysarea_img}"

-rm -f "${embed_img}"

 exit 0

-- 

1.8.2.1