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https://github.com/reactos/reactos.git
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[EXT2]
Fix remaining issues, bootsector compiles with GAS and ML. Sadly GAs sucks a bit and does neither allow to specify byte offsets, nor does it chose this itself to save space. As a result the code gets several bytes larger and I had to trim the messages even more. svn path=/trunk/; revision=53938
This commit is contained in:
Timo Kreuzer
parent
ec00096fc0
commit
e8469d97f6
2 changed files with 99 additions and 90 deletions
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@ -2,7 +2,7 @@
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if(ARCH MATCHES i386 OR ARCH MATCHES amd64)
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CreateBootSectorTarget2(dosmbr ${CMAKE_CURRENT_SOURCE_DIR}/dosmbr.S ${CMAKE_CURRENT_BINARY_DIR}/dosmbr.bin 7c00)
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#CreateBootSectorTarget2(ext2 ${CMAKE_CURRENT_SOURCE_DIR}/ext2.S ${CMAKE_CURRENT_BINARY_DIR}/ext2.bin 0)
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CreateBootSectorTarget2(ext2 ${CMAKE_CURRENT_SOURCE_DIR}/ext2.S ${CMAKE_CURRENT_BINARY_DIR}/ext2.bin 0)
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CreateBootSectorTarget2(fat32 ${CMAKE_CURRENT_SOURCE_DIR}/fat32.S ${CMAKE_CURRENT_BINARY_DIR}/fat32.bin 7c00)
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CreateBootSectorTarget2(fat ${CMAKE_CURRENT_SOURCE_DIR}/fat.S ${CMAKE_CURRENT_BINARY_DIR}/fat.bin 7c00)
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CreateBootSectorTarget2(isoboot ${CMAKE_CURRENT_SOURCE_DIR}/isoboot.S ${CMAKE_CURRENT_BINARY_DIR}/isoboot.bin 7000)
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@ -13,11 +13,7 @@ add_cd_file(TARGET fat32 DESTINATION loader NO_CAB FILE ${CMAKE_CURRENT_BINARY_D
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add_cd_file(TARGET fat DESTINATION loader NO_CAB FILE ${CMAKE_CURRENT_BINARY_DIR}/fat.bin FOR all)
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add_cd_file(TARGET isoboot DESTINATION loader NO_CAB FILE ${CMAKE_CURRENT_BINARY_DIR}/isoboot.bin FOR all)
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add_cd_file(TARGET isobtrt DESTINATION loader NO_CAB FILE ${CMAKE_CURRENT_BINARY_DIR}/isobtrt.bin FOR all)
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if(NOT MSVC)
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CreateBootSectorTarget(ext2 ${CMAKE_CURRENT_SOURCE_DIR}/ext2.asm ${CMAKE_CURRENT_BINARY_DIR}/ext2.bin 0)
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add_cd_file(TARGET ext2 DESTINATION loader NO_CAB FILE ${CMAKE_CURRENT_BINARY_DIR}/ext2.bin FOR all)
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endif()
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add_cd_file(TARGET ext2 DESTINATION loader NO_CAB FILE ${CMAKE_CURRENT_BINARY_DIR}/ext2.bin FOR all)
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endif()
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@ -7,6 +7,9 @@
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// [bp-0x0c] Here we will store the size of the disk as the BIOS reports in CHS form
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// [bp-0x10] Here we will store the number of LBA sectors read
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#include <asm.inc>
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.code16
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SECTORS_PER_TRACK = HEX(04)
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NUMBER_OF_HEADS = HEX(08)
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BIOS_CHS_DRIVE_SIZE = HEX(0C)
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@ -18,40 +21,46 @@ EXT2_S_IFMT = HEX(0f0)
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EXT2_S_IFREG = HEX(080)
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org 7c00h
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//org 7c00h
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segment .text
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bits 16
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start:
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jmp short main
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nop
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BootDrive db HEX(80)
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BootDrive:
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.byte HEX(80)
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//BootPartition db 0 // Moved to end of boot sector to have a standard format across all boot sectors
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//SectorsPerTrack db 63 // Moved to [bp-SECTORS_PER_TRACK]
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//NumberOfHeads dw 16 // Moved to [bp-NUMBER_OF_HEADS]
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//BiosCHSDriveSize dd (1024 * 1024 * 63) // Moved to [bp-BIOS_CHS_DRIVE_SIZE]
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//LBASectorsRead dd 0 // Moved to [bp-LBA_SECTORS_READ]
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Ext2VolumeStartSector dd 263088 // Start sector of the ext2 volume
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Ext2BlockSize dd 2 // Block size in sectors
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Ext2BlockSizeInBytes dd 1024 // Block size in bytes
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Ext2PointersPerBlock dd 256 // Number of block pointers that can be contained in one block
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Ext2GroupDescPerBlock dd 32 // Number of group descriptors per block
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Ext2FirstDataBlock dd 1 // First data block (1 for 1024-byte blocks, 0 for bigger sizes)
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Ext2InodesPerGroup dd 2048 // Number of inodes per group
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Ext2InodesPerBlock dd 8 // Number of inodes per block
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Ext2VolumeStartSector:
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.long 263088 // Start sector of the ext2 volume
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Ext2BlockSize:
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.long 2 // Block size in sectors
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Ext2BlockSizeInBytes:
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.long 1024 // Block size in bytes
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Ext2PointersPerBlock:
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.long 256 // Number of block pointers that can be contained in one block
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Ext2GroupDescPerBlock:
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.long 32 // Number of group descriptors per block
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Ext2FirstDataBlock:
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.long 1 // First data block (1 for 1024-byte blocks, 0 for bigger sizes)
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Ext2InodesPerGroup:
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.long 2048 // Number of inodes per group
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Ext2InodesPerBlock:
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.long 8 // Number of inodes per block
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Ext2ReadEntireFileLoadSegment:
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dw 0
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.word 0
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Ext2InodeIndirectPointer:
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dd 0
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.long 0
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Ext2InodeDoubleIndirectPointer:
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dd 0
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.long 0
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Ext2BlocksLeftToRead:
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dd 0
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.long 0
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main:
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xor ax,ax // Setup segment registers
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@ -61,16 +70,16 @@ main:
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mov bp, HEX(7c00)
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mov sp, HEX(7b00) // Setup a stack
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cmp byte ptr [bp+BootDrive], HEX(0ff) // If they have specified a boot drive then use it
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mov si, offset BootDrive
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cmp byte ptr [si], HEX(0ff) // If they have specified a boot drive then use it
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jne GetDriveParameters
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mov [bp+BootDrive],dl // Save the boot drive
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mov [si],dl // Save the boot drive
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GetDriveParameters:
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mov ah,08h
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mov dl,[bp+BootDrive] // Get boot drive in dl
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mov ah, 8
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mov dl,[si] // Get boot drive in dl
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int HEX(13) // Request drive parameters from the bios
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jnc CalcDriveSize // If the call succeeded then calculate the drive size
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@ -125,7 +134,7 @@ Ext2ReadGroupDesc:
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shl eax,5 // Group = (Group * sizeof(GROUP_DESCRIPTOR) /* 32 */)
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xor edx,edx
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div dword ptr [bp+Ext2GroupDescPerBlock] // Group = (Group / Ext2GroupDescPerBlock)
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add eax, [bp+Ext2FirstDataBlock] // Group = Group + Ext2FirstDataBlock + 1
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add eax, dword ptr [bp+Ext2FirstDataBlock] // Group = Group + Ext2FirstDataBlock + 1
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inc eax // EAX now has the group descriptor block number
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// EDX now has the group descriptor offset in the block
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@ -142,10 +151,10 @@ Ext2ReadGroupDesc:
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// Instead of using the call instruction we will
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// just put Ext2ReadBlock right after this routine
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// Reads ext2 block into [ES:BX]
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// Reads ext2 block into ES:[BX]
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// EAX has logical block number to read
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Ext2ReadBlock:
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mov ecx, [bp+Ext2BlockSize]
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mov ecx, dword ptr [bp+Ext2BlockSize]
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mul ecx
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jmp ReadSectors
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@ -193,11 +202,11 @@ Ext2ReadInode:
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ret
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// Reads logical sectors into [ES:BX]
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// Reads logical sectors into ES:[BX]
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// EAX has logical sector number to read
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// CX has number of sectors to read
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ReadSectors:
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add eax, [bp+Ext2VolumeStartSector] // Add the start of the volume
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add eax, dword ptr [bp+Ext2VolumeStartSector] // Add the start of the volume
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cmp eax, [bp-BIOS_CHS_DRIVE_SIZE] // Check if they are reading a sector outside CHS range
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jae ReadSectorsLBA // Yes - go to the LBA routine
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// If at all possible we want to use LBA routines because
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@ -208,7 +217,7 @@ ReadSectors:
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CheckInt13hExtensions: // Now check if this computer supports extended reads
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mov ah, HEX(41) // AH = 41h
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mov bx, HEX(55aa) // BX = 55AAh
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mov dl,[bp+BootDrive] // DL = drive (80h-FFh)
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mov dl, byte ptr [bp+BootDrive] // DL = drive (80h-FFh)
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int HEX(13) // IBM/MS INT 13 Extensions - INSTALLATION CHECK
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jc ReadSectorsCHS // CF set on error (extensions not supported)
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cmp bx, HEX(0aa55) // BX = AA55h if installed
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@ -228,7 +237,7 @@ ReadSectorsLBA:
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ReadSectorsSetupDiskAddressPacket:
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mov [bp-LBA_SECTORS_READ],cx
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mov word ptr [bp-LBA_SECTORS_READ+2],0
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o32 push 0
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data32 push 0
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push eax // Put 64-bit logical block address on stack
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push es // Put transfer segment on stack
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push bx // Put transfer offset on stack
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@ -237,9 +246,9 @@ ReadSectorsSetupDiskAddressPacket:
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mov si,sp // Setup disk address packet on stack
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mov dl, [bp+BootDrive] // Drive number
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mov ah,42h // Int 13h, AH = 42h - Extended Read
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int 13h // Call BIOS
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mov dl, byte ptr [bp+BootDrive] // Drive number
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mov ah, HEX(42) // Int 13h, AH = 42h - Extended Read
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int HEX(13) // Call BIOS
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jc PrintDiskError // If the read failed then abort
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add sp, 16 // Remove disk address packet from stack
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@ -247,7 +256,7 @@ ReadSectorsSetupDiskAddressPacket:
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popad // Restore sector count & logical sector number
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push bx
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mov ebx,DWORD [bp-LBA_SECTORS_READ]
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mov ebx, [bp-LBA_SECTORS_READ]
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add eax,ebx // Increment sector to read
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shl ebx,5
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mov dx,es
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@ -261,7 +270,7 @@ ReadSectorsSetupDiskAddressPacket:
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ret
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// Reads logical sectors into [ES:BX]
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// Reads logical sectors into ES:[BX]
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// EAX has logical sector number to read
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// CX has number of sectors to read
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ReadSectorsCHS:
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@ -270,15 +279,15 @@ ReadSectorsCHS:
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ReadSectorsCHSLoop:
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pushad
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xor edx,edx
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mov ecx,DWORD [bp-SECTORS_PER_TRACK]
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mov ecx, [bp-SECTORS_PER_TRACK]
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div ecx // Divide logical by SectorsPerTrack
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inc dl // Sectors numbering starts at 1 not 0
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mov cl,dl // Sector in CL
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mov edx,eax
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shr edx,16
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div WORD [bp-NUMBER_OF_HEADS] // Divide logical by number of heads
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div word ptr [bp-NUMBER_OF_HEADS] // Divide logical by number of heads
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mov dh,dl // Head in DH
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mov dl,[bp+BootDrive] // Drive number in DL
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mov dl, byte ptr [bp+BootDrive] // Drive number in DL
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mov ch,al // Cylinder in CX
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ror ah,2 // Low 8 bits of cylinder in CH, high 2 bits
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// in CL shifted to bits 6 & 7
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@ -316,8 +325,8 @@ Reboot:
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mov si,msgAnyKey // Press any key message
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call PutChars // Display it
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xor ax,ax
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int 16h // Wait for a keypress
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int 19h // Reboot
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int HEX(16) // Wait for a keypress
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int HEX(19) // Reboot
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PutChars:
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lodsb
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@ -326,16 +335,16 @@ PutChars:
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call PutCharsCallBios
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jmp short PutChars
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PutCharsCallBios:
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mov ah,0eh
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mov bx,07h
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int 10h
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retn
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mov ah, HEX(0e)
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mov bx, HEX(07)
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int HEX(10)
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ret
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Done:
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mov al,0dh
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mov al, HEX(0d)
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call PutCharsCallBios
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mov al,0ah
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mov al, HEX(0a)
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call PutCharsCallBios
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retn
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ret
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@ -344,14 +353,15 @@ msgDiskError:
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// Sorry, need the space...
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//msgAnyKey db 'Press any key to restart',0
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msgAnyKey:
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.ascii "Press any key", NUL
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.ascii "Press key", NUL
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times 509-($-$$) db 0 // Pad to 509 bytes
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// times 509-($-$$) db 0 // Pad to 509 bytes
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.org 509
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BootPartition:
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db 0
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.byte 0
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dw HEX(0aa55) // BootSector signature
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.word HEX(0aa55) // BootSector signature
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// End of bootsector
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@ -367,14 +377,14 @@ LoadRootDirectory:
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call Ext2ReadInode // Read in the inode
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// Point ES:DI to the inode structure at 6000:8000
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push WORD HEX(6000)
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push HEX(6000)
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pop es
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mov di, HEX(8000)
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push di
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push es // Save these for later
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// Get root directory size from inode structure
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mov eax, [es:di+4]
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mov eax, es:[di+4]
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push eax
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// Now that the inode has been read in load
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@ -410,7 +420,7 @@ SearchRootDirectory:
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jz FoundFile
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// Nope, didn't find it in this entry, keep looking
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movzx ecx,word ptr [es:di+4]
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movzx ecx,word ptr es:[di+4]
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add edx,ecx
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// Check to see if we have reached the
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@ -420,14 +430,14 @@ SearchRootDirectory:
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jmp PrintFileNotFound
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FoundFile:
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mov eax,[es:di] // Get inode number from directory entry
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mov eax,es:[di] // Get inode number from directory entry
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call Ext2ReadInode // Read in the inode
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// Point ES:DI to the inode structure at 6000:8000
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pop es
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pop di // These were saved earlier
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mov cx,[es:di] // Get the file mode so we can make sure it's a regular file
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mov cx, es:[di] // Get the file mode so we can make sure it's a regular file
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and ch,EXT2_S_IFMT // Mask off everything but the file type
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cmp ch,EXT2_S_IFREG // Make sure it's a regular file
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je LoadFreeLoader
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@ -439,8 +449,8 @@ LoadFreeLoader:
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call Ext2ReadEntireFile // Read freeldr.sys to 0000:8000
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mov dl,[bp+BootDrive]
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mov dh,[bp+BootPartition]
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mov dl, byte ptr [bp+BootDrive]
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mov dh, byte ptr [bp+BootPartition]
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push 0 // push segment (0x0000)
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mov eax, [HEX(8000) + HEX(0A8)] // load the RVA of the EntryPoint into eax
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add eax, HEX(8000) // RVA -> VA
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@ -470,7 +480,7 @@ Ext2ReadEntireFile:
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// We will do this by rounding the
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// file size up to the next block
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// size and then dividing by the block size
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mov eax,DWORD [bp+Ext2BlockSizeInBytes] // Get the block size in bytes
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mov eax, dword ptr [bp+Ext2BlockSizeInBytes] // Get the block size in bytes
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push eax
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dec eax // Ext2BlockSizeInBytes -= 1
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add eax, es:[di+4] // Add the file size
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@ -480,22 +490,22 @@ Ext2ReadEntireFile:
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push eax
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// Make sure the file size isn't zero
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cmp eax,byte 0
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cmp eax, 0
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jnz Ext2ReadEntireFile2
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jmp PrintFileSizeError
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Ext2ReadEntireFile2:
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// Save the indirect & double indirect pointers
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mov edx,DWORD [es:di+ HEX(58)] // Get indirect pointer
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mov [bp+Ext2InodeIndirectPointer],edx // Save indirect pointer
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mov edx,DWORD [es:di+ HEX(5c)] // Get double indirect pointer
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mov [bp+Ext2InodeDoubleIndirectPointer],edx // Save double indirect pointer
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mov edx, es:[di+ HEX(58)] // Get indirect pointer
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mov dword ptr [bp+Ext2InodeIndirectPointer], edx // Save indirect pointer
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mov edx, es:[di+ HEX(5c)] // Get double indirect pointer
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mov dword ptr [bp+Ext2InodeDoubleIndirectPointer],edx // Save double indirect pointer
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// Now copy the direct pointers to 7000:0000
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// so that we can call Ext2ReadDirectBlocks
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push ds // Save DS
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push es
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push WORD HEX(7000)
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push HEX(7000)
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pop es
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pop ds
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mov si, HEX(8028)
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@ -513,15 +523,15 @@ Ext2ReadEntireFile2:
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// Check to see if we actually have
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// blocks left to read
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cmp eax,byte 0
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cmp eax, 0
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jz Ext2ReadEntireFileDone
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// Now we have read all the direct blocks in
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// the inode. So now we have to read the indirect
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// block and read all it's direct blocks
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push eax // Save the total block count
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mov eax,DWORD [BYTE bp+Ext2InodeIndirectPointer] // Get the indirect block pointer
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push WORD HEX(7000)
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mov eax, dword ptr [bp+Ext2InodeIndirectPointer] // Get the indirect block pointer
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push HEX(7000)
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pop es
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xor bx,bx // Set the load address to 7000:0000
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call Ext2ReadBlock // Read the block
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@ -529,7 +539,7 @@ Ext2ReadEntireFile2:
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// Now we have all the block pointers from the
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// indirect block in the right location so read them in
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pop eax // Restore the total block count
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mov ecx,DWORD [BYTE bp+Ext2PointersPerBlock] // Get the number of block pointers that one block contains
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mov ecx, dword ptr [bp+Ext2PointersPerBlock] // Get the number of block pointers that one block contains
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call Ext2ReadDirectBlockList
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// Check to see if we actually have
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@ -542,9 +552,9 @@ Ext2ReadEntireFile2:
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// we have to read the double indirect block
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// and read all it's indirect blocks
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// (whew, it's a good thing I don't support triple indirect blocks)
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mov [bp+Ext2BlocksLeftToRead],eax // Save the total block count
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mov eax,DWORD [bp+Ext2InodeDoubleIndirectPointer] // Get the double indirect block pointer
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push WORD HEX(7800)
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mov dword ptr [bp+Ext2BlocksLeftToRead],eax // Save the total block count
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mov eax, dword ptr [bp+Ext2InodeDoubleIndirectPointer] // Get the double indirect block pointer
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push HEX(7800)
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pop es
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push es // Save an extra copy of this value on the stack
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||||
xor bx,bx // Set the load address to 7000:8000
|
||||
|
|
@ -554,28 +564,28 @@ Ext2ReadEntireFile2:
|
|||
xor di,di
|
||||
|
||||
Ext2ReadIndirectBlock:
|
||||
mov eax,DWORD [es:di] // Get indirect block pointer
|
||||
add di,BYTE 4 // Update DI for next array index
|
||||
mov eax, es:[di] // Get indirect block pointer
|
||||
add di, 4 // Update DI for next array index
|
||||
push es
|
||||
push di
|
||||
|
||||
push WORD HEX(7000)
|
||||
push 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 [bp+Ext2BlocksLeftToRead] // Restore the total block count
|
||||
mov ecx,DWORD [bp+Ext2PointersPerBlock] // Get the number of block pointers that one block contains
|
||||
mov eax, dword ptr [bp+Ext2BlocksLeftToRead] // Restore the total block count
|
||||
mov ecx, dword ptr [bp+Ext2PointersPerBlock] // Get the number of block pointers that one block contains
|
||||
call Ext2ReadDirectBlockList
|
||||
mov [bp+Ext2BlocksLeftToRead],eax // Save the total block count
|
||||
mov dword ptr [bp+Ext2BlocksLeftToRead],eax // Save the total block count
|
||||
pop di
|
||||
pop es
|
||||
|
||||
// Check to see if we actually have
|
||||
// blocks left to read
|
||||
cmp eax,byte 0
|
||||
cmp eax, 0
|
||||
jnz Ext2ReadIndirectBlock
|
||||
|
||||
Ext2ReadEntireFileDone:
|
||||
|
|
@ -606,12 +616,12 @@ CallExt2ReadDirectBlocks:
|
|||
// CX contains the number of blocks to read
|
||||
Ext2ReadDirectBlocks:
|
||||
|
||||
push WORD HEX(7000)
|
||||
push HEX(7000)
|
||||
pop es
|
||||
xor di,di // Set ES:DI = 7000:0000
|
||||
|
||||
Ext2ReadDirectBlocksLoop:
|
||||
mov eax,[es:di] // Get direct block pointer from array
|
||||
mov eax,es:[di] // Get direct block pointer from array
|
||||
add di, 4 // Update DI for next array index
|
||||
|
||||
push cx // Save number of direct blocks left
|
||||
|
|
@ -660,14 +670,17 @@ DisplayItAndReboot:
|
|||
msgFreeLdr:
|
||||
.ascii "freeldr.sys not found", NUL
|
||||
msgFileSize:
|
||||
.ascii "File size is 0", NUL
|
||||
.ascii "File size 0", NUL
|
||||
msgRegFile:
|
||||
.ascii "freeldr.sys isnt a regular file", NUL
|
||||
filename:
|
||||
.ascii "freeldr.sys"
|
||||
msgLoading:
|
||||
.ascii "Loading FreeLoader...", NUL
|
||||
.ascii "Loading...", NUL
|
||||
|
||||
times 1022-($-$$) db 0 // Pad to 1022 bytes
|
||||
// times 1022-($-$$) db 0 // Pad to 1022 bytes
|
||||
.org 1022
|
||||
|
||||
dw HEX(0aa55) // BootSector signature
|
||||
.word HEX(0aa55) // BootSector signature
|
||||
|
||||
END
|
||||
|
|
|
|||
Loading…
Reference in a new issue