[tkreuzer] 52153: [ISOBOOT] Fix portable bootsector and make it gas compatible (its opcode identical to the nasm compiled one and works correctly)
9 Jun
2011
9 Jun
'11
11:23 a.m.
Author: tkreuzer
Date: Thu Jun 9 11:23:01 2011
New Revision: 52153
URL: http://svn.reactos.org/svn/reactos?rev=52153&view=rev
Log:
[ISOBOOT]
Fix portable bootsector and make it gas compatible (its opcode identical to the nasm
compiled one and works correctly)
Modified:
trunk/reactos/boot/freeldr/bootsect/isoboot.S
Modified: trunk/reactos/boot/freeldr/bootsect/isoboot.S
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/bootsect/isob…
==============================================================================
--- trunk/reactos/boot/freeldr/bootsect/isoboot.S [iso-8859-1] (original)
+++ trunk/reactos/boot/freeldr/bootsect/isoboot.S [iso-8859-1] Thu Jun 9 11:23:01 2011
@@ -94,7 +94,7 @@
//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 @@
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 @@
// 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 @@
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 @@
// 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 @@
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 @@
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 @@
.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 @@
writemsg:
push ax
push si
- mov si, isolinux_str
+ mov si, offset isolinux_str
call writestr
pop si
call writestr
@@ -714,7 +714,7 @@
//
// crlf: Print a newline
crlf:
- mov si, crlf_msg
+ mov si, offset crlf_msg
// Fall through
//
@@ -758,7 +758,7 @@
.loop:
rol eax, 4
push eax
- and al, 0Fh
+ and al, HEX(0F)
cmp al, 10
jae .high
.low:
@@ -808,7 +808,7 @@
// 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 @@
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 @@
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 @@
//
.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
-
-.org 2047 // Pad to file offset 2046
-.word 0aa55h // BootSector signature
+ .word 2 //32 // Max sectors per transfer
+
+.org 2046 // Pad to file offset 2046
+.word HEX(0aa55) // BootSector signature
.endcode16
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