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From 46aa8934bbcbc427f7424e77bead7c0c8356a138 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 307/364] 	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
-- 
1.8.1.4