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[ISOBOOT]

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Fix portable bootsector and make it gas compatible (its opcode identical to the nasm compiled one and works correctly)

svn path=/trunk/; revision=52153
This commit is contained in:
Timo Kreuzer 2011-06-09 11:23:01 +00:00
parent 17de5b1c0f
commit 0944b73b87
1 changed files with 54 additions and 54 deletions
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108
reactos/boot/freeldr/bootsect/isoboot.S
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@ -94,7 +94,7 @@ resb ISOFileNameEnd, 1
//align open_file_t_size
absolute HEX(5060)
resb Files, MAX_OPEN * open_file_t_size
resb Files, (MAX_OPEN * open_file_t_size)
/******************************************************************************/
@ -104,7 +104,7 @@ start:
cli // Disable interrupts
xor ax, ax // ax = segment zero
mov ss, ax // Initialize stack segment
mov sp, start // Set up stack
mov sp, offset start // Set up stack
mov ds, ax // Initialize other segment registers
mov es, ax
mov fs, ax
@ -150,7 +150,7 @@ relocate:
// Display the 'Press key' message and wait for a maximum of 5 seconds
call crlf
mov si, presskey_msg // si points to 'Press key' message
mov si, offset presskey_msg // si points to 'Press key' message
call writestr // display the message
mov byte ptr ds:[TimeoutCount], 5
@ -166,7 +166,7 @@ relocate:
cmp eax, ebx
jnz .poll_again
mov si, dot_msg // print '.'
mov si, offset dot_msg // print '.'
call writestr
dec byte ptr ds:[TimeoutCount] // decrement timeout counter
jz .boot_harddisk
@ -215,7 +215,7 @@ relocate:
// at least some BIOSes will get the wrong value otherwise
mov ax, HEX(4B01) // Get disk emulation status
mov dl, byte ptr ds:[DriveNo]
mov si, spec_packet
mov si, offset spec_packet
int HEX(13)
jc spec_query_failed // Shouldn't happen (BIOS bug)
mov dl, byte ptr ds:[DriveNo]
@ -430,7 +430,7 @@ searchdir_iso:
inc di
and cl,cl
jz .isfile
cmp cl, '\'
cmp cl, 92 // '\'
jne .scan
mov byte ptr ds:[di-1], 0 // Terminate at directory name
mov cl,2 // Search for directory
@ -519,7 +519,7 @@ searchdir_iso:
pop di // Next filename pointer
// restore the backslash in the filename
mov byte ptr ds:[di-1], '\'
mov byte ptr ds:[di-1], 92 // '\'
mov byte ptr ds:[ISOFlags], cl // Restore the flags
jz .failure // Did we fail? If so fail for real!
@ -656,9 +656,9 @@ spec_query_failed:
.test_loop:
pusha
mov ax, HEX(4B01)
mov si, spec_packet
mov byte ptr ds:[si], 13 ; Size of buffer
int 13h
mov si, offset spec_packet
mov byte ptr ds:[si], 13 // Size of buffer
int HEX(13)
popa
jc .still_broken
@ -704,7 +704,7 @@ fatal_error:
writemsg:
push ax
push si
mov si, isolinux_str
mov si, offset isolinux_str
call writestr
pop si
call writestr
@ -714,7 +714,7 @@ writemsg:
//
// crlf: Print a newline
crlf:
mov si, crlf_msg
mov si, offset crlf_msg
// Fall through
//
@ -758,7 +758,7 @@ writehex_common:
.loop:
rol eax, 4
push eax
and al, 0Fh
and al, HEX(0F)
cmp al, 10
jae .high
.low:
@ -808,7 +808,7 @@ getonesec:
// BP - Sector count
//
getlinsec:
mov si, dapa // Load up the DAPA
mov si, offset dapa // Load up the DAPA
mov word ptr ds:[si+4], bx
mov bx, es
mov word ptr ds:[si+6], bx
@ -841,7 +841,7 @@ xint13:
mov byte ptr ds:[RetryCount], retry_count
.try:
pushad
int 13h
int HEX(13)
jc .error
add sp, 8*4 // Clean up stack
ret
@ -892,7 +892,7 @@ kaboom:
mov fs, ax
mov gs, ax
sti
mov si, err_bootfailed
mov si, offset err_bootfailed
call writestr
xor ax, ax // Wait for keypress
int HEX(16)
@ -985,88 +985,88 @@ no_isolinux_msg:
//
.align 8
spec_packet:
db HEX(13) // Size of packet
.byte HEX(13) // Size of packet
sp_media:
db 0 // Media type
.byte 0 // Media type
sp_drive:
db 0 // Drive number
.byte 0 // Drive number
sp_controller:
db 0 // Controller index
.byte 0 // Controller index
sp_lba:
dd 0 // LBA for emulated disk image
.long 0 // LBA for emulated disk image
sp_devspec:
dw 0 // IDE/SCSI information
.word 0 // IDE/SCSI information
sp_buffer:
dw 0 // User-provided buffer
.word 0 // User-provided buffer
sp_loadseg:
dw 0 // Load segment
.word 0 // Load segment
sp_sectors:
dw 0 // Sector count
.word 0 // Sector count
sp_chs:
db 0,0,0 // Simulated CHS geometry
.byte 0,0,0 // Simulated CHS geometry
sp_dummy:
db 0 // Scratch, safe to overwrite
.byte 0 // Scratch, safe to overwrite
//
// EBIOS drive parameter packet
//
.align 8
drive_params:
dw 30 // Buffer size
.word 30 // Buffer size
dp_flags:
dw 0 // Information flags
.word 0 // Information flags
dp_cyl:
dd 0 // Physical cylinders
.long 0 // Physical cylinders
dp_head:
dd 0 // Physical heads
.long 0 // Physical heads
dp_sec:
dd 0 // Physical sectors/track
.long 0 // Physical sectors/track
dp_totalsec:
dd 0,0 // Total sectors
.long 0,0 // Total sectors
dp_secsize:
dw 0 // Bytes per sector
.word 0 // Bytes per sector
dp_dpte:
dd 0 // Device Parameter Table
.long 0 // Device Parameter Table
dp_dpi_key:
dw 0 // 0BEDDh if rest valid
.word 0 // 0BEDDh if rest valid
dp_dpi_len:
db 0 // DPI len
db 0
dw 0
.byte 0 // DPI len
.byte 0
.word 0
dp_bus:
db 0,0,0,0 // Host bus type
.byte 0,0,0,0 // Host bus type
dp_interface:
db 0,0,0,0,0,0,0,0 // Interface type
.byte 0,0,0,0,0,0,0,0 // Interface type
db_i_path:
dd 0,0 // Interface path
.long 0,0 // Interface path
db_d_path:
dd 0,0 // Device path
db 0
.long 0,0 // Device path
.byte 0
db_dpi_csum:
db 0 // Checksum for DPI info
.byte 0 // Checksum for DPI info
//
// EBIOS disk address packet
//
.align 8
dapa:
dw 16 // Packet size
.word 16 // Packet size
.count:
dw 0 // Block count
.word 0 // Block count
.off:
dw 0 // Offset of buffer
.word 0 // Offset of buffer
.seg:
dw 0 // Segment of buffer
.word 0 // Segment of buffer
.lba:
dd 0 // LBA (LSW)
dd 0 // LBA (MSW)
.long 0 // LBA (LSW)
.long 0 // LBA (MSW)
.align 4
MaxTransfer:
dw 2 //32 // Max sectors per transfer
.word 2 //32 // Max sectors per transfer
.org 2047 // Pad to file offset 2046
.word 0aa55h // BootSector signature
.org 2046 // Pad to file offset 2046
.word HEX(0aa55) // BootSector signature
.endcode16