[tkreuzer] 53930: [EXT2] - Use HEX() macro - remove BYTE modifiers - [es:di] -> es:[di] - equ -> =
Author: tkreuzer Date: Sun Oct 2 15:47:52 2011 New Revision: 53930
URL: http://svn.reactos.org/svn/reactos?rev=53930&view=rev Log: [EXT2] - Use HEX() macro - remove BYTE modifiers - [es:di] -> es:[di] - equ -> =
Modified: trunk/reactos/boot/freeldr/bootsect/ext2.S
Modified: trunk/reactos/boot/freeldr/bootsect/ext2.S URL: http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/bootsect/ext2.... ============================================================================== --- trunk/reactos/boot/freeldr/bootsect/ext2.S [iso-8859-1] (original) +++ trunk/reactos/boot/freeldr/bootsect/ext2.S [iso-8859-1] Sun Oct 2 15:47:52 2011 @@ -7,15 +7,15 @@ // [bp-0x0c] Here we will store the size of the disk as the BIOS reports in CHS form // [bp-0x10] Here we will store the number of LBA sectors read
-SECTORS_PER_TRACK equ 0x04 -NUMBER_OF_HEADS equ 0x08 -BIOS_CHS_DRIVE_SIZE equ 0x0C -LBA_SECTORS_READ equ 0x10 - - -EXT2_ROOT_INO equ 2 -EXT2_S_IFMT equ 0f0h -EXT2_S_IFREG equ 080h +SECTORS_PER_TRACK = HEX(04) +NUMBER_OF_HEADS = HEX(08) +BIOS_CHS_DRIVE_SIZE = HEX(0C) +LBA_SECTORS_READ = HEX(10) + + +EXT2_ROOT_INO = 2 +EXT2_S_IFMT = HEX(0f0) +EXT2_S_IFREG = HEX(080)
org 7c00h @@ -28,7 +28,7 @@ jmp short main nop
-BootDrive db 0x80 +BootDrive db HEX(80) //BootPartition db 0 // Moved to end of boot sector to have a standard format across all boot sectors //SectorsPerTrack db 63 // Moved to [bp-SECTORS_PER_TRACK] //NumberOfHeads dw 16 // Moved to [bp-NUMBER_OF_HEADS] @@ -58,26 +58,26 @@ mov ds,ax // Make DS correct mov es,ax // Make ES correct mov ss,ax // Make SS correct - mov bp,7c00h - mov sp,7b00h // Setup a stack - - - cmp BYTE [BYTE bp+BootDrive],BYTE 0xff // If they have specified a boot drive then use it + mov bp, HEX(7c00) + mov sp, HEX(7b00) // Setup a stack + + + cmp byte ptr [bp+BootDrive], HEX(0ff) // If they have specified a boot drive then use it jne GetDriveParameters
- mov [BYTE bp+BootDrive],dl // Save the boot drive + mov [bp+BootDrive],dl // Save the boot drive
GetDriveParameters: mov ah,08h - mov dl,[BYTE bp+BootDrive] // Get boot drive in dl - int 13h // Request drive parameters from the bios + mov dl,[bp+BootDrive] // Get boot drive in dl + int HEX(13) // Request drive parameters from the bios jnc CalcDriveSize // If the call succeeded then calculate the drive size
// If we get here then the call to the BIOS failed // so just set CHS equal to the maximum addressable // size - mov cx,0ffffh + mov cx, HEX(0ffff) mov dh,cl
CalcDriveSize: @@ -86,21 +86,21 @@ mov bl,ch // Put the low 8-bits of the cylinder count into BL mov bh,cl // Put the high 2-bits in BH shr bh,6 // Shift them into position, now BX contains the cylinder count - and cl,3fh // Mask off cylinder bits from sector count + and cl, HEX(3f) // Mask off cylinder bits from sector count // CL now contains sectors per track and DH contains head count movzx eax,dh // Move the heads into EAX movzx ebx,bx // Move the cylinders into EBX movzx ecx,cl // Move the sectors per track into ECX inc eax // Make it one based because the bios returns it zero based - mov [BYTE bp-NUMBER_OF_HEADS],eax // Save number of heads - mov [BYTE bp-SECTORS_PER_TRACK],ecx // Save number of sectors per track + mov [bp-NUMBER_OF_HEADS],eax // Save number of heads + mov [bp-SECTORS_PER_TRACK],ecx // Save number of sectors per track inc ebx // Make the cylinder count one based also mul ecx // Multiply heads with the sectors per track, result in edx:eax mul ebx // Multiply the cylinders with (heads * sectors) [stored in edx:eax already]
// We now have the total number of sectors as reported // by the bios in eax, so store it in our variable - mov [BYTE bp-BIOS_CHS_DRIVE_SIZE],eax + mov [bp-BIOS_CHS_DRIVE_SIZE],eax
LoadExtraBootCode: @@ -110,7 +110,7 @@ xor eax,eax inc eax // Read logical sector 1, EAX now = 1 mov cx,1 // Read one sector - mov bx,7e00h // Read sector to [0000:7e00h] + mov bx, HEX(7e00) // Read sector to [0000:7e00h] call ReadSectors
jmp LoadRootDirectory @@ -124,14 +124,14 @@ Ext2ReadGroupDesc: shl eax,5 // Group = (Group * sizeof(GROUP_DESCRIPTOR) /* 32 */) xor edx,edx - div DWORD [BYTE bp+Ext2GroupDescPerBlock] // Group = (Group / Ext2GroupDescPerBlock) - add eax,DWORD [BYTE bp+Ext2FirstDataBlock] // Group = Group + Ext2FirstDataBlock + 1 + div dword ptr [bp+Ext2GroupDescPerBlock] // Group = (Group / Ext2GroupDescPerBlock) + add eax, [bp+Ext2FirstDataBlock] // Group = Group + Ext2FirstDataBlock + 1 inc eax // EAX now has the group descriptor block number // EDX now has the group descriptor offset in the block
// Adjust the read offset so that the // group descriptor is read to 7000:8000 - mov ebx,78000h + mov ebx, HEX(78000) sub ebx,edx shr ebx,4 mov es,bx @@ -145,7 +145,7 @@ // Reads ext2 block into [ES:BX] // EAX has logical block number to read Ext2ReadBlock: - mov ecx,DWORD [BYTE bp+Ext2BlockSize] + mov ecx, [bp+Ext2BlockSize] mul ecx jmp ReadSectors
@@ -156,11 +156,11 @@ Ext2ReadInode: dec eax // Inode = Inode - 1 xor edx,edx - div DWORD [BYTE bp+Ext2InodesPerGroup] // Inode = (Inode / Ext2InodesPerGroup) + div dword ptr [bp+Ext2InodesPerGroup] // Inode = (Inode / Ext2InodesPerGroup) mov ebx,eax // EBX now has the inode group number mov eax,edx xor edx,edx - div DWORD [BYTE bp+Ext2InodesPerBlock] // Inode = (Inode / Ext2InodesPerBlock) + div dword ptr [bp+Ext2InodesPerBlock] // Inode = (Inode / Ext2InodesPerBlock) shl edx,7 // FIXME: InodeOffset *= 128 (make the array index a byte offset) // EAX now has the inode offset block number from inode table // EDX now has the inode offset in the block @@ -174,16 +174,16 @@
// Group descriptor has been read, now // grab the inode table block number from it - push WORD 7000h + push HEX(7000) pop es - mov di,8008h + mov di, HEX(8008) pop eax // Restore inode offset block number from stack - add eax,DWORD [es:di] // Add the inode table start block + add eax, es:[di] // Add the inode table start block
// Adjust the read offset so that the // inode we want is read to 6000:8000 pop edx // Restore inode offset in the block from stack - mov ebx,68000h + mov ebx, HEX(68000) sub ebx,edx shr ebx,4 mov es,bx @@ -197,8 +197,8 @@ // EAX has logical sector number to read // CX has number of sectors to read ReadSectors: - add eax,DWORD [BYTE bp+Ext2VolumeStartSector] // Add the start of the volume - cmp eax,DWORD [BYTE bp-BIOS_CHS_DRIVE_SIZE] // Check if they are reading a sector outside CHS range + add eax, [bp+Ext2VolumeStartSector] // Add the start of the volume + cmp eax, [bp-BIOS_CHS_DRIVE_SIZE] // Check if they are reading a sector outside CHS range jae ReadSectorsLBA // Yes - go to the LBA routine // If at all possible we want to use LBA routines because // They are optimized to read more than 1 sector per read @@ -206,12 +206,12 @@ pushad // Save logical sector number & sector count
CheckInt13hExtensions: // Now check if this computer supports extended reads - mov ah,0x41 // AH = 41h - mov bx,0x55aa // BX = 55AAh - mov dl,[BYTE bp+BootDrive] // DL = drive (80h-FFh) - int 13h // IBM/MS INT 13 Extensions - INSTALLATION CHECK + mov ah, HEX(41) // AH = 41h + mov bx, HEX(55aa) // BX = 55AAh + mov dl,[bp+BootDrive] // DL = drive (80h-FFh) + int HEX(13) // IBM/MS INT 13 Extensions - INSTALLATION CHECK jc ReadSectorsCHS // CF set on error (extensions not supported) - cmp bx,0xaa55 // BX = AA55h if installed + cmp bx, HEX(0aa55) // BX = AA55h if installed jne ReadSectorsCHS test cl,1 // CX = API subset support bitmap jz ReadSectorsCHS // Bit 0, extended disk access functions (AH=42h-44h,47h,48h) supported @@ -221,33 +221,33 @@ ReadSectorsLBA: pushad // Save logical sector number & sector count
- cmp cx,byte 64 // Since the LBA calls only support 0x7F sectors at a time we will limit ourselves to 64 + cmp cx, 64 // Since the LBA calls only support 0x7F sectors at a time we will limit ourselves to 64 jbe ReadSectorsSetupDiskAddressPacket // If we are reading less than 65 sectors then just do the read mov cx,64 // Otherwise read only 64 sectors on this loop iteration
ReadSectorsSetupDiskAddressPacket: - mov [BYTE bp-LBA_SECTORS_READ],cx - mov WORD [BYTE bp-LBA_SECTORS_READ+2],0 - o32 push byte 0 + mov [bp-LBA_SECTORS_READ],cx + mov word ptr [bp-LBA_SECTORS_READ+2],0 + o32 push 0 push eax // Put 64-bit logical block address on stack push es // Put transfer segment on stack push bx // Put transfer offset on stack push cx // Set transfer count - push byte 0x10 // Set size of packet to 10h + push 16 // Set size of packet to 10h mov si,sp // Setup disk address packet on stack
- mov dl,[BYTE bp+BootDrive] // Drive number + mov dl, [bp+BootDrive] // Drive number mov ah,42h // Int 13h, AH = 42h - Extended Read int 13h // Call BIOS jc PrintDiskError // If the read failed then abort
- add sp,byte 0x10 // Remove disk address packet from stack + add sp, 16 // Remove disk address packet from stack
popad // Restore sector count & logical sector number
push bx - mov ebx,DWORD [BYTE bp-LBA_SECTORS_READ] + mov ebx,DWORD [bp-LBA_SECTORS_READ] add eax,ebx // Increment sector to read shl ebx,5 mov dx,es @@ -255,7 +255,7 @@ mov es,dx pop bx
- sub cx,[BYTE bp-LBA_SECTORS_READ] + sub cx,[bp-LBA_SECTORS_READ] jnz ReadSectorsLBA // Read next sector
ret @@ -270,21 +270,21 @@ ReadSectorsCHSLoop: pushad xor edx,edx - mov ecx,DWORD [BYTE bp-SECTORS_PER_TRACK] + mov ecx,DWORD [bp-SECTORS_PER_TRACK] div ecx // Divide logical by SectorsPerTrack inc dl // Sectors numbering starts at 1 not 0 mov cl,dl // Sector in CL mov edx,eax shr edx,16 - div WORD [BYTE bp-NUMBER_OF_HEADS] // Divide logical by number of heads + div WORD [bp-NUMBER_OF_HEADS] // Divide logical by number of heads mov dh,dl // Head in DH - mov dl,[BYTE bp+BootDrive] // Drive number in DL + mov dl,[bp+BootDrive] // Drive number in DL mov ch,al // Cylinder in CX ror ah,2 // Low 8 bits of cylinder in CH, high 2 bits // in CL shifted to bits 6 & 7 or cl,ah // Or with sector number - mov ax,0201h - int 13h // DISK - READ SECTORS INTO MEMORY + mov ax, HEX(0201) + int HEX(13) // DISK - READ SECTORS INTO MEMORY // AL = number of sectors to read, CH = track, CL = sector // DH = head, DL = drive, ES:BX -> buffer to fill // Return: CF set on error, AH = status (see AH=01h), AL = number of sectors read @@ -296,7 +296,7 @@ inc eax // Increment Sector to Read
mov dx,es - add dx,byte 20h // Increment read buffer for next sector + add dx, HEX(20) // Increment read buffer for next sector mov es,dx
loop ReadSectorsCHSLoop // Read next sector @@ -351,7 +351,7 @@ BootPartition: db 0
- dw 0aa55h // BootSector signature + dw HEX(0aa55) // BootSector signature
// End of bootsector @@ -367,14 +367,14 @@ call Ext2ReadInode // Read in the inode
// Point ES:DI to the inode structure at 6000:8000 - push WORD 6000h - pop es - mov di,8000h + push WORD HEX(6000) + pop es + mov di, HEX(8000) push di push es // Save these for later
// Get root directory size from inode structure - mov eax,DWORD [es:di+4] + mov eax, [es:di+4] push eax
// Now that the inode has been read in load @@ -384,7 +384,7 @@ // Since the root directory was loaded to 0000:8000 // then add 8000h to the root directory's size pop eax - mov edx,8000h // Set EDX to the current offset in the root directory + mov edx, HEX(8000) // Set EDX to the current offset in the root directory add eax,edx // Initially add 8000h to the size of the root directory
SearchRootDirectory: @@ -400,17 +400,17 @@ mov es,ax mov di,dx push di // Save the start of the directory entry - add di,byte 8 // Add the offset to the filename + add di, 8 // Add the offset to the filename mov si,filename mov cl,11 - rep cmpsb // Compare the file names + repe cmpsb // Compare the file names pop di pop eax pop edx jz FoundFile
// Nope, didn't find it in this entry, keep looking - movzx ecx,WORD [es:di+4] + movzx ecx,word ptr [es:di+4] add edx,ecx
// Check to see if we have reached the @@ -439,11 +439,11 @@
call Ext2ReadEntireFile // Read freeldr.sys to 0000:8000
- mov dl,[BYTE bp+BootDrive] - mov dh,[BYTE bp+BootPartition] + mov dl,[bp+BootDrive] + mov dh,[bp+BootPartition] push 0 // push segment (0x0000) - mov eax, [0x8000 + 0xA8] // load the RVA of the EntryPoint into eax - add eax, 0x8000 // RVA -> VA + mov eax, [HEX(8000) + HEX(0A8)] // load the RVA of the EntryPoint into eax + add eax, HEX(8000) // RVA -> VA push ax // push offset retf // Transfer control to FreeLoader
@@ -463,17 +463,17 @@ Ext2ReadEntireFile:
// Reset the load segment - mov WORD [BYTE bp+Ext2ReadEntireFileLoadSegment],800h + mov word ptr [bp+Ext2ReadEntireFileLoadSegment], HEX(800)
// Now we must calculate how // many blocks to read in // We will do this by rounding the // file size up to the next block // size and then dividing by the block size - mov eax,DWORD [BYTE bp+Ext2BlockSizeInBytes] // Get the block size in bytes + mov eax,DWORD [bp+Ext2BlockSizeInBytes] // Get the block size in bytes push eax dec eax // Ext2BlockSizeInBytes -= 1 - add eax,DWORD [es:di+4] // Add the file size + add eax, es:[di+4] // Add the file size xor edx,edx pop ecx // Divide by the block size in bytes div ecx // EAX now contains the number of blocks to load @@ -486,19 +486,19 @@
Ext2ReadEntireFile2: // Save the indirect & double indirect pointers - mov edx,DWORD [es:di+0x58] // Get indirect pointer - mov [BYTE bp+Ext2InodeIndirectPointer],edx // Save indirect pointer - mov edx,DWORD [es:di+0x5c] // Get double indirect pointer - mov [BYTE bp+Ext2InodeDoubleIndirectPointer],edx // Save double indirect pointer + mov edx,DWORD [es:di+ HEX(58)] // Get indirect pointer + mov [bp+Ext2InodeIndirectPointer],edx // Save indirect pointer + mov edx,DWORD [es:di+ HEX(5c)] // Get double indirect pointer + mov [bp+Ext2InodeDoubleIndirectPointer],edx // Save double indirect pointer
// Now copy the direct pointers to 7000:0000 // so that we can call Ext2ReadDirectBlocks push ds // Save DS push es - push WORD 7000h + push WORD HEX(7000) pop es pop ds - mov si,8028h + mov si, HEX(8028) xor di,di // DS:SI = 6000:8028 ES:DI = 7000:0000 mov cx,24 // Moving 24 words of data rep movsw @@ -521,7 +521,7 @@ // block and read all it's direct blocks push eax // Save the total block count mov eax,DWORD [BYTE bp+Ext2InodeIndirectPointer] // Get the indirect block pointer - push WORD 7000h + push WORD HEX(7000) pop es xor bx,bx // Set the load address to 7000:0000 call Ext2ReadBlock // Read the block @@ -534,7 +534,7 @@
// Check to see if we actually have // blocks left to read - cmp eax,byte 0 + cmp eax, 0 jz Ext2ReadEntireFileDone
// Now we have read all the direct blocks from @@ -542,9 +542,9 @@ // we have to read the double indirect block // and read all it's indirect blocks // (whew, it's a good thing I don't support triple indirect blocks) - mov [BYTE bp+Ext2BlocksLeftToRead],eax // Save the total block count - mov eax,DWORD [BYTE bp+Ext2InodeDoubleIndirectPointer] // Get the double indirect block pointer - push WORD 7800h + mov [bp+Ext2BlocksLeftToRead],eax // Save the total block count + mov eax,DWORD [bp+Ext2InodeDoubleIndirectPointer] // Get the double indirect block pointer + push WORD HEX(7800) pop es push es // Save an extra copy of this value on the stack xor bx,bx // Set the load address to 7000:8000 @@ -559,17 +559,17 @@ push es push di
- push WORD 7000h + push WORD HEX(7000) pop es xor bx,bx // Set the load address to 7000:0000 call Ext2ReadBlock // Read the indirect block
// Now we have all the block pointers from the // indirect block in the right location so read them in - mov eax,DWORD [BYTE bp+Ext2BlocksLeftToRead] // Restore the total block count - mov ecx,DWORD [BYTE bp+Ext2PointersPerBlock] // Get the number of block pointers that one block contains + mov eax,DWORD [bp+Ext2BlocksLeftToRead] // Restore the total block count + mov ecx,DWORD [bp+Ext2PointersPerBlock] // Get the number of block pointers that one block contains call Ext2ReadDirectBlockList - mov [BYTE bp+Ext2BlocksLeftToRead],eax // Save the total block count + mov [bp+Ext2BlocksLeftToRead],eax // Save the total block count pop di pop es
@@ -606,23 +606,23 @@ // CX contains the number of blocks to read Ext2ReadDirectBlocks:
- push WORD 7000h + push WORD HEX(7000) pop es xor di,di // Set ES:DI = 7000:0000
Ext2ReadDirectBlocksLoop: mov eax,[es:di] // Get direct block pointer from array - add di,BYTE 4 // Update DI for next array index + add di, 4 // Update DI for next array index
push cx // Save number of direct blocks left push es // Save array segment push di // Save array offset - mov es,[BYTE bp+Ext2ReadEntireFileLoadSegment] + mov es,[bp+Ext2ReadEntireFileLoadSegment] xor bx,bx // Setup load address for next read
call Ext2ReadBlock // Read the block (this updates ES for the next read)
- mov [BYTE bp+Ext2ReadEntireFileLoadSegment],es // Save updated ES + mov [bp+Ext2ReadEntireFileLoadSegment],es // Save updated ES
pop di // Restore the array offset pop es // Restore the array segment @@ -670,4 +670,4 @@
times 1022-($-$$) db 0 // Pad to 1022 bytes
- dw 0aa55h // BootSector signature + dw HEX(0aa55) // BootSector signature
-
tkreuzer＠svn.reactos.org