2009-06-04 Vladimir Serbinenko <phcoder@gmail.com>
Absolute addressing through constant with Apple's cc * kern/i386/pc/startup.S: Define necessary constants and address through it when using ABS with Apple's CC * boot/i386/pc/diskboot.S: likewise * boot/i386/pc/boot.S: likewise * boot/i386/pc/lnxboot.S: likewise * boot/i386/pc/cdboot.S: likewise * mmap/i386/pc/mmap_helper.S: likewise * commands/i386/pc/drivemap_int13h.S: likewise
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8 changed files with 214 additions and 1 deletions
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@ -30,7 +30,11 @@
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#define ABS(x) (x-_start+0x7c00)
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/* Print message string */
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#ifdef APPLE_CC
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#define MSG(x) x ## _abs = ABS(x); movw $x ## _abs, %si; call message
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#else
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#define MSG(x) movw $ABS(x), %si; call message
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#endif
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.file "boot.S"
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@ -125,7 +129,12 @@ boot_drive_check:
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* ljmp to the next instruction because some bogus BIOSes
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* jump to 07C0:0000 instead of 0000:7C00.
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*/
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#ifdef APPLE_CC
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real_start_abs = ABS(real_start)
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ljmp $0, $(real_start_abs)
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#else
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ljmp $0, $ABS(real_start)
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#endif
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real_start:
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@ -143,7 +152,12 @@ real_start:
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* Check if we have a forced disk reference here
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*/
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/* assign root_drive at the same time */
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movw ABS(boot_drive), %ax
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#ifdef APPLE_CC
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boot_drive_abs = ABS (boot_drive)
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movw boot_drive_abs, %ax
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#else
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movw ABS(boot_drive), %ax
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#endif
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movb %ah, %dh
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cmpb $0xff, %al
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je 1f
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@ -156,7 +170,12 @@ real_start:
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MSG(notification_string)
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/* set %si to the disk address packet */
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#ifdef APPLE_CC
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disk_address_packet_abs = ABS (disk_address_packet)
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movw $disk_address_packet_abs, %si
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#else
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movw $ABS(disk_address_packet), %si
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#endif
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/* do not probe LBA if the drive is a floppy */
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testb $GRUB_BOOT_MACHINE_BIOS_HD_FLAG, %dl
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@ -197,10 +216,18 @@ lba_mode:
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movw $0x0010, (%si)
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/* the absolute address */
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#ifdef APPLE_CC
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kernel_sector_abs = ABS (kernel_sector)
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movl (kernel_sector_abs), %ebx
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movl %ebx, 8(%si)
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movl (kernel_sector_abs + 4), %ebx
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movl %ebx, 12(%si)
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#else
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movl ABS(kernel_sector), %ebx
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movl %ebx, 8(%si)
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movl ABS(kernel_sector + 4), %ebx
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movl %ebx, 12(%si)
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#endif
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/* the segment of buffer address */
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movw $GRUB_BOOT_MACHINE_BUFFER_SEG, 6(%si)
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@ -267,12 +294,22 @@ final_init:
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setup_sectors:
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/* load logical sector start (top half) */
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#ifdef APPLE_CC
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kernel_sector_abs = ABS (kernel_sector)
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movl (kernel_sector_abs + 4), %eax
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#else
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movl ABS(kernel_sector + 4), %eax
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#endif
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orl %eax, %eax
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jnz geometry_error
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/* load logical sector start (bottom half) */
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#ifdef APPLE_CC
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movl (kernel_sector_abs), %eax
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#else
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movl ABS(kernel_sector), %eax
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#endif
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/* zero %edx */
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xorl %edx, %edx
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@ -336,7 +373,12 @@ setup_sectors:
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movw %es, %bx
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copy_buffer:
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#ifdef APPLE_CC
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kernel_segment_abs = ABS (kernel_segment)
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movw (kernel_segment_abs), %es
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#else
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movw ABS(kernel_segment), %es
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#endif
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/*
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* We need to save %cx and %si because the startup code in
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@ -360,7 +402,12 @@ copy_buffer:
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popw %dx
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/* boot kernel */
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#ifdef APPLE_CC
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kernel_address_abs = ABS (kernel_address)
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jmp *(kernel_address_abs)
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#else
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jmp *(kernel_address)
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#endif
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/* END OF MAIN LOOP */
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@ -446,7 +493,12 @@ floppy_probe:
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* Perform floppy probe.
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*/
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#ifdef APPLE_CC
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probe_values_abs = ABS (probe_values)
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movw $(probe_values_abs-1), %si
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#else
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movw $ABS(probe_values-1), %si
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#endif
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probe_loop:
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/* reset floppy controller INT 13h AH=0 */
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@ -67,8 +67,15 @@ bi_reserved:
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movw %ax, %ds
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movw %ax, %es
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#ifdef APPLE_CC
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err_noboot_msg_abs = 0x7C00 + err_noboot_msg - start
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movw $err_noboot_msg_abs, %si
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bi_length_dif = bi_length - next
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movl %cs:bi_length_dif(%bx), %ecx
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#else
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movw $(0x7C00 + err_noboot_msg - start), %si
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movl %cs: bi_length - next(%bx), %ecx
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#endif
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orl %ecx, %ecx
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jz fail
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@ -152,7 +159,12 @@ read_cdrom:
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ret
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cdrom_fail:
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#ifdef APPLE_CC
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err_cdfail_msg_abs = 0x7C00 + err_cdfail_msg - start
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movw $(err_cdfail_msg_abs), %si
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#else
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movw $(0x7C00 + err_cdfail_msg - start), %si
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#endif
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fail:
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movb $0x0e, %ah
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@ -28,7 +28,11 @@
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#define ABS(x) (x-_start+GRUB_BOOT_MACHINE_KERNEL_ADDR)
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/* Print message string */
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#ifdef APPLE_CC
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#define MSG(x) x ## _abs = ABS(x); mov $x ## _abs, %esi; call message
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#else
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#define MSG(x) movw $ABS(x), %si; call message
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#endif
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.file "diskboot.S"
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@ -61,7 +65,12 @@ _start:
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popw %si
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/* this sets up for the first run through "bootloop" */
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#ifdef APPLE_CC
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firstlist_off_abs = ABS (firstlist - GRUB_BOOT_MACHINE_LIST_SIZE)
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movl $firstlist_off_abs, %edi
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#else
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movw $ABS(firstlist - GRUB_BOOT_MACHINE_LIST_SIZE), %di
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#endif
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/* save the sector number of the second sector in %ebp */
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movl (%di), %ebp
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@ -123,8 +123,15 @@ data_leng:
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linux_init:
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#ifdef APPLE_CC
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reg_edx_rel = reg_edx - start
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code32_start_rel = code32_start - start
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movw %cs:(reg_edx_rel), %dx
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movl %cs:(code32_start_rel), %ebp
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#else
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movw %cs:(reg_edx - start), %dx
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movl %cs:(code32_start - start), %ebp
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#endif
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linux_next:
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@ -132,12 +139,22 @@ linux_next:
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normalize:
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popw %bx
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#ifdef APPLE_CC
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normalize_rel = normalize - start
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subw $(normalize_rel), %bx
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#else
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subw $(normalize - start), %bx
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#endif
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shrw $4, %bx
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movw %cs, %ax
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addw %bx, %ax
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pushw %ax
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#ifdef APPLE_CC
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real_code_rel = real_code - start
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pushw $(real_code_rel)
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#else
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pushw $(real_code - start)
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#endif
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lret /* Jump to real_code. */
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real_code:
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@ -164,7 +181,12 @@ real_code:
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rep
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movsl
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#ifdef APPLE_CC
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real_code_2_rel = real_code_2 - start
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ljmp $(CODE_ADDR >> 4), $(real_code_2_rel)
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#else
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ljmp $(CODE_ADDR >> 4), $(real_code_2 - start)
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#endif
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real_code_2:
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@ -189,8 +211,15 @@ real_code_2:
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cmpl $MULTIBOOT_MAGIC, %ss:(DATA_ADDR + GRUB_KERNEL_MACHINE_DATA_END)
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jz 1f
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#ifdef APPLE_CC
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ramdisk_image_rel = ramdisk_image - start
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ramdisk_size_rel = ramdisk_size - start
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movl (ramdisk_image_rel), %esi
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movl (ramdisk_size_rel), %ecx
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#else
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movl (ramdisk_image - start), %esi
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movl (ramdisk_size - start), %ecx
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#endif
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movl $(DATA_ADDR - 0x200), %edi
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jmp 2f
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@ -205,7 +234,12 @@ real_code_2:
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movsbl %dh, %eax
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movl %eax, %ss:(DATA_ADDR + GRUB_KERNEL_MACHINE_INSTALL_DOS_PART)
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#ifdef APPLE_CC
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reg_edx_rel = reg_edx - start
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movsbl (reg_edx_rel + 2), %eax
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#else
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movsbl (reg_edx + 2 - start), %eax
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#endif
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movl %eax, %ss:(DATA_ADDR + GRUB_KERNEL_MACHINE_INSTALL_BSD_PART)
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movb $0xFF, %dh
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@ -234,6 +268,28 @@ move_memory:
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pushl %ecx
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movl %esi, %eax
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#ifdef APPLE_CC
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gdt_src1_rel = gdt_src1 - start
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gdt_src2_rel = gdt_src2 - start
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gdt_dst1_rel = gdt_dst1 - start
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gdt_dst2_rel = gdt_dst2 - start
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gdt_rel = gdt - start
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movw %si, (gdt_src1_rel)
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shrl $16, %eax
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movb %al, (gdt_src1_rel + 2)
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movb %ah, (gdt_src2_rel)
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movl %edi, %eax
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movw %di, (gdt_dst1_rel)
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shrl $16, %eax
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movb %al, (gdt_dst1_rel + 2)
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movb %ah, (gdt_dst2_rel)
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movw $(gdt_rel), %si
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movb $0x87, %ah
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shrw $1, %cx
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#else
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movw %si, (gdt_src1 - start)
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shrl $16, %eax
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movb %al, (gdt_src1 + 2 - start)
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@ -248,6 +304,7 @@ move_memory:
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movw $(gdt - start), %si
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movb $0x87, %ah
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shrw $1, %cx
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#endif
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int $0x15
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@ -257,7 +314,12 @@ move_memory:
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popl %esi
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jnc 2f
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#ifdef APPLE_CC
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err_int15_msg_rel = err_int15_msg - start
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movw $(err_int15_msg_rel), %si
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#else
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movw $(err_int15_msg - start), %si
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#endif
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jmp fail
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2:
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