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

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2013-04-14 18:53:14 +02:00
parent 5351da81e0
commit b49fe8792a
5 changed files with 159 additions and 80 deletions
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194
grub-core/boot/i386/pc/boot.S
View file

@ -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

5
grub-core/boot/i386/pc/cdboot.S
View file

@ -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