Ros-dev

ros-dev@reactos.org

5791 discussions

A room for improvement?
by Pierre Schweitzer 13 Sep '10

13 Sep '10

Hi, while working on GPT handling for ReactOS, one thing appeared: Microsoft (at least in Windows 2003 SP1) is using hardcoded partition entry size, ie it assumes that every partition entry in GPT will be 128 bytes big. Even if that assertion is largely right, it might exist cases where it's wrong. That's even why there's a field in GPT header that contains such size. Furthermore, reading Apple technical note(1) about GPT precise one more thing: "Do not hardwire the current size of the partition entry (128 bytes).". As we have no commercial issues with Apple, perhaps could we drop a bit compatibility with Windows 2003 and fix something obvious? In most cases, users won't see any difference. Only difference would be that ReactOS could properly handle GPT with exotic partition entry size when Windows can't. Any opinion on that subject? Best regards, P. Schweitzer (1): http://developer.apple.com/library/mac/#technotes/tn2006/tn2166.html

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48748 "Goodbye" Confusion
by Ros Arm 12 Sep '10

12 Sep '10

Hello, eVb checked in one of his final patches yesterday from his development machine in China, where we worked on a final pass on the driver. Unfortunately, my last two (unrelated) check ins were done from his machine (as most of you know, I was in China for the past month), and he was not used to SVN caching the credentials of the last user. Revision 48748 was a checkin from eVb, and his "goodbye" was in reference to my departure. Since it used my cached credentials from the same machine, it must've caused a lot of confusion. Many apologies and thanks for understanding. -r

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Re: [ros-dev] [ros-diffs] [fireball] 48745: [NTOS] - Daniel Zimmermann: Fix POPF bugs in VDM mode, namely truncation of the stackpointer to 16 bit and setting proper flags in the trapframe eflags register. This fixes proble...
by Timo Kreuzer 12 Sep '10

12 Sep '10

fireball(a)svn.reactos.org wrote: > Author: fireball > Date: Sat Sep 11 09:20:26 2010 > New Revision: 48745 > ... > /* Save EFlags */ > + Esp -= 4; > + *(PULONG)(Esp - 2) = V86EFlags; > This looks wrong to me. The (Esp - 2) I mean. > + if (KiVdmGetPrefixFlags(Flags) & PFX_FLAG_OPER32) > + { > + /* Read EFlags */ > + EFlags = *(PULONG)Esp; > + Esp += 4; > + } > + else > + { > + /* Read EFlags */ > + EFlags = *(PUSHORT)Esp; > + Esp += 2; > /* Read correct flags and use correct stack address */ > - Esp -= 2; > EFlags &= 0xFFFF; > Here the comment got broken a bit. > /* Set new ESP */ > - TrapFrame->HardwareEsp = Esp; > + TrapFrame->HardwareEsp = (USHORT)Esp; > This is not correct. We earlier calculated the flat Esp from Ss and Sp. Example: HardwareSegSs = 0x10, HardwareEsp = 0x10 -> flat Esp = 0x110, then you substract 4, and get 0x10C. But this is not the value of the new HardwareEsp. TrapFrame->HardwareEsp needs to be either modified in parallel to the flat Esp or calculated like (USHORT)(Esp - (TrapFrame->HardwareSegSs << 4)). Regards, Timo

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Pacth: Freeldr disk geometry bug
by Eric Kohl 09 Sep '10

09 Sep '10

Hi! This patch fixes the disk geometry bug I mentioned in my previous mail. It enables disk.sys and usetup.exe to use the same disk geometry that is used by the BIOS. Due to another bug or workaround in the 1st stage setup, the 2nd stage setup will not boot at all. Regards, Eric Index: boot/freeldr/freeldr/arch/i386/hardware.c =================================================================== --- boot/freeldr/freeldr/arch/i386/hardware.c (revision 48722) +++ boot/freeldr/freeldr/arch/i386/hardware.c (working copy) @@ -327,7 +327,6 @@ { PCM_PARTIAL_RESOURCE_LIST PartialResourceList; PCM_DISK_GEOMETRY_DEVICE_DATA DiskGeometry; - EXTENDED_GEOMETRY ExtGeometry; GEOMETRY Geometry; ULONG Size; @@ -362,16 +361,8 @@ DiskGeometry = (PVOID)(((ULONG_PTR)PartialResourceList) + sizeof(CM_PARTIAL_RESOURCE_LIST)); /* Get the disk geometry */ - ExtGeometry.Size = sizeof(EXTENDED_GEOMETRY); - if (DiskGetExtendedDriveParameters(DriveNumber, &ExtGeometry, ExtGeometry.Size)) + if(MachDiskGetDriveGeometry(DriveNumber, &Geometry)) { - DiskGeometry->BytesPerSector = ExtGeometry.BytesPerSector; - DiskGeometry->NumberOfCylinders = ExtGeometry.Cylinders; - DiskGeometry->SectorsPerTrack = ExtGeometry.SectorsPerTrack; - DiskGeometry->NumberOfHeads = ExtGeometry.Heads; - } - else if(MachDiskGetDriveGeometry(DriveNumber, &Geometry)) - { DiskGeometry->BytesPerSector = Geometry.BytesPerSector; DiskGeometry->NumberOfCylinders = Geometry.Cylinders; DiskGeometry->SectorsPerTrack = Geometry.Sectors; Index: boot/freeldr/freeldr/arch/i386/pcdisk.c =================================================================== --- boot/freeldr/freeldr/arch/i386/pcdisk.c (revision 48722) +++ boot/freeldr/freeldr/arch/i386/pcdisk.c (working copy) @@ -296,12 +296,25 @@ BOOLEAN PcDiskGetDriveGeometry(ULONG DriveNumber, PGEOMETRY Geometry) { + EXTENDED_GEOMETRY ExtGeometry; REGS RegsIn; REGS RegsOut; ULONG Cylinders; DPRINTM(DPRINT_DISK, "DiskGetDriveGeometry()\n"); + /* Try to get the extended geometry first */ + ExtGeometry.Size = sizeof(EXTENDED_GEOMETRY); + if (DiskGetExtendedDriveParameters(DriveNumber, &ExtGeometry, ExtGeometry.Size)) + { + Geometry->Cylinders = ExtGeometry.Cylinders; + Geometry->Heads = ExtGeometry.Heads; + Geometry->Sectors = ExtGeometry.SectorsPerTrack; + Geometry->BytesPerSector = ExtGeometry.BytesPerSector; + + return TRUE; + } + /* BIOS Int 13h, function 08h - Get drive parameters * AH = 08h * DL = drive (bit 7 set for hard disk)

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Severe bug found: Freeldr passes wrong disk geometry to ntoskrnl.exe and disk.sys
by Eric Kohl 09 Sep '10

09 Sep '10

Hi! I just found a severe bug in hardware detection code of Freeldr. It uses two configuration nodes in the hardware tree to pass information about detected hard-disks to ntoskrnl.exe and disk.sys. First, hard-disk information is passed as a DiskPeripheral node attached to a DiskController node. Second, hard-disk information is passed as an array of CM_INT13_DRIVE_PARAMETER entries in a special system configuration node, if the disks were detected by the BIOS. As part of the boot process, the special system configuration node is used by disk.sys to determine the disk geometry used by the BIOS. Unfortunately, this configuration node did not use the extended disk geometry (LBA geometry) but the old CHS geometry even if the LBA geometry was available. I already fixed this bug in my local source tree and suddenly Freeldr, disk.sys and usetup.exe report exactly the same disk geometry as gparted (http://gparted.sourceforge.net/download.php). Unfortunately, using this patch breaks the 2nd stage setup. I will provide a patch that fixes the Freeldr issue as soon as I have cleaned up the source tree. Please help me find the remaining bug or workaround that keeps ReactOS from booting into 2nd stage setup! I guess it is either part of usetup or somewhere in the partition management routines. Regards, Eric

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Re: [ros-dev] [ros-diffs] [akhaldi] 48687: [FREELDR] - Convert fat12/16 boot sector helper code to gas syntax. Brought to you by the Arty. [CMAKE] - Add freeldr and setupldr to build.
by Alex Ionescu 07 Sep '10

07 Sep '10

This is retarded, GAS supports Intel syntax. Why did this require rewriting everything in AT&T syntax and introducing bugs? And what's up with calling AT&T syntax "GAS" Syntax. I wonder what Brian would say.... It's funny how this project gets rid of old developers, gets new developers, and has them make the same mistakes/idiotic things the old developers left for in the first place... Good job! Best regards, Alex Ionescu On Thu, Sep 2, 2010 at 10:39 AM, <akhaldi(a)svn.reactos.org> wrote: > Author: akhaldi > Date: Thu Sep 2 17:39:45 2010 > New Revision: 48687 > > URL: http://svn.reactos.org/svn/reactos?rev=48687&view=rev > Log: > [FREELDR] > - Convert fat12/16 boot sector helper code to gas syntax. Brought to you by the Arty. > [CMAKE] > - Add freeldr and setupldr to build. > > Added: > branches/cmake-bringup/boot/freeldr/freeldr/arch/i386/fathelp.S > - copied, changed from r48568, branches/cmake-bringup/boot/freeldr/freeldr/arch/i386/fathelp.asm > Removed: > branches/cmake-bringup/boot/freeldr/freeldr/arch/i386/fathelp.asm > Modified: > branches/cmake-bringup/boot/CMakeLists.txt > > Modified: branches/cmake-bringup/boot/CMakeLists.txt > URL: http://svn.reactos.org/svn/reactos/branches/cmake-bringup/boot/CMakeLists.t… > ============================================================================== > --- branches/cmake-bringup/boot/CMakeLists.txt [iso-8859-1] (original) > +++ branches/cmake-bringup/boot/CMakeLists.txt [iso-8859-1] Thu Sep 2 17:39:45 2010 > @@ -5,3 +5,203 @@ > CreateBootSectorTarget(fat ${CMAKE_CURRENT_SOURCE_DIR}/freeldr/bootsect/fat.asm ${CMAKE_CURRENT_BINARY_DIR}/freeldr/bootsect/fat.bin) > CreateBootSectorTarget(isoboot ${CMAKE_CURRENT_SOURCE_DIR}/freeldr/bootsect/isoboot.asm ${CMAKE_CURRENT_BINARY_DIR}/freeldr/bootsect/isoboot.bin) > CreateBootSectorTarget(isobtrt ${CMAKE_CURRENT_SOURCE_DIR}/freeldr/bootsect/isobtrt.asm ${CMAKE_CURRENT_BINARY_DIR}/freeldr/bootsect/isobtrt.bin) > + > +include_directories(BEFORE freeldr/freeldr/include) > +include_directories(${REACTOS_SOURCE_DIR}/ntoskrnl/include) > + > +if(ARCH MATCHES i386) > +list(APPEND FREELDR_STARTUP_SOURCE > + freeldr/freeldr/arch/i386/fathelp.S > + freeldr/freeldr/arch/i386/arch.S) > +elseif(ARCH MATCHES amd64) > +list(APPEND FREELDR_STARTUP_SOURCE > + freeldr/freeldr/arch/amd64/fathelp.S > + freeldr/freeldr/arch/amd64/arch.S) > +endif(ARCH MATCHES i386) > + > +if(ARCH MATCHES i386) > +list(APPEND FREELDR_BASE64K_SOURCE > + freeldr/freeldr/arch/i386/boot.S > + freeldr/freeldr/arch/i386/drvmap.S > + freeldr/freeldr/arch/i386/i386cpu.S > + freeldr/freeldr/arch/i386/i386idt.S > + freeldr/freeldr/arch/i386/i386pnp.S > + freeldr/freeldr/arch/i386/i386trap.S > + freeldr/freeldr/arch/i386/int386.S > + freeldr/freeldr/arch/i386/linux.S > + freeldr/freeldr/arch/i386/mb.S) > +elseif(ARCH MATCHES amd64) > +list(APPEND FREELDR_BASE64K_SOURCE > + freeldr/freeldr/arch/amd64/drvmap.S > + freeldr/freeldr/arch/amd64/i386cpu.S > + freeldr/freeldr/arch/amd64/i386idt.S > + freeldr/freeldr/arch/amd64/i386trap.S > + freeldr/freeldr/arch/amd64/mb.S) > +endif(ARCH MATCHES i386) > + > +set_source_files_properties(${FREELDR_BASE64K_SOURCE} PROPERTIES COMPILE_DEFINITIONS "_NTHAL_") > + > +include_directories(${REACTOS_SOURCE_DIR}/lib/cmlib) > + > +list(APPEND FREELDR_BASE_SOURCE > + freeldr/freeldr/arcemul/mm.c > + freeldr/freeldr/arcemul/time.c > + freeldr/freeldr/cache/blocklist.c > + freeldr/freeldr/cache/cache.c > + freeldr/freeldr/comm/rs232.c > + freeldr/freeldr/disk/disk.c > + freeldr/freeldr/disk/partition.c > + freeldr/freeldr/disk/ramdisk.c > + freeldr/freeldr/fs/ext2.c > + freeldr/freeldr/fs/fat.c > + freeldr/freeldr/fs/fs.c > + freeldr/freeldr/fs/iso.c > + freeldr/freeldr/fs/ntfs.c > + freeldr/freeldr/inifile/ini_init.c > + freeldr/freeldr/inifile/inifile.c > + freeldr/freeldr/inifile/parse.c > + freeldr/freeldr/mm/meminit.c > + freeldr/freeldr/mm/mm.c > + freeldr/freeldr/reactos/registry.c > + freeldr/freeldr/reactos/arcname.c > + freeldr/freeldr/reactos/archwsup.c > + freeldr/freeldr/reactos/binhive.c > + freeldr/freeldr/reactos/reactos.c > + freeldr/freeldr/reactos/imageldr.c > + freeldr/freeldr/rtl/bget.c > + freeldr/freeldr/rtl/libsupp.c > + freeldr/freeldr/ui/directui.c > + freeldr/freeldr/ui/gui.c > + freeldr/freeldr/ui/minitui.c > + freeldr/freeldr/ui/noui.c > + freeldr/freeldr/ui/tui.c > + freeldr/freeldr/ui/tuimenu.c > + freeldr/freeldr/ui/ui.c > + freeldr/freeldr/video/fade.c > + freeldr/freeldr/video/palette.c > + freeldr/freeldr/video/video.c > + freeldr/freeldr/windows/conversion.c > + freeldr/freeldr/windows/peloader.c > + freeldr/freeldr/windows/winldr.c > + freeldr/freeldr/windows/wlmemory.c > + freeldr/freeldr/windows/wlregistry.c > + freeldr/freeldr/freeldr.c > + freeldr/freeldr/debug.c > + freeldr/freeldr/version.c > + freeldr/freeldr/cmdline.c > + freeldr/freeldr/machine.c > + freeldr/freeldr/options.c > + freeldr/freeldr/linuxboot.c > + freeldr/freeldr/oslist.c) > + > +if(ARCH MATCHES i386) > +list(APPEND FREELDR_BASE_SOURCE freeldr/freeldr/disk/scsiport.c) > +endif(ARCH MATCHES i386) > + > +set_source_files_properties(${FREELDR_BASE_SOURCE} PROPERTIES COMPILE_DEFINITIONS "_NTHAL_;_BLDR_;_NTSYSTEM_") > + > +include_directories(${REACTOS_SOURCE_DIR}/include/reactos/libs) > +include_directories(${REACTOS_SOURCE_DIR}/include/reactos/elf) > + > +if(ARCH MATCHES i386) > +list(APPEND FREELDR_ARCH_SOURCE > + freeldr/freeldr/arch/i386/_alloca.S > + freeldr/freeldr/arch/i386/archmach.c > + freeldr/freeldr/arch/i386/custom.c > + freeldr/freeldr/arch/i386/drivemap.c > + freeldr/freeldr/arch/i386/halstub.c > + freeldr/freeldr/arch/i386/hardware.c > + freeldr/freeldr/arch/i386/hwacpi.c > + freeldr/freeldr/arch/i386/hwapm.c > + freeldr/freeldr/arch/i386/hwpci.c > + freeldr/freeldr/arch/i386/i386disk.c > + freeldr/freeldr/arch/i386/i386rtl.c > + freeldr/freeldr/arch/i386/i386vid.c > + freeldr/freeldr/arch/i386/loader.c > + freeldr/freeldr/arch/i386/machpc.c > + freeldr/freeldr/arch/i386/miscboot.c > + freeldr/freeldr/arch/i386/ntoskrnl.c > + freeldr/freeldr/arch/i386/pccons.c > + freeldr/freeldr/arch/i386/pcdisk.c > + freeldr/freeldr/arch/i386/pcmem.c > + freeldr/freeldr/arch/i386/pcrtc.c > + freeldr/freeldr/arch/i386/pcvideo.c > + freeldr/freeldr/arch/i386/machxbox.c > + freeldr/freeldr/arch/i386/xboxcons.c > + freeldr/freeldr/arch/i386/xboxdisk.c > + freeldr/freeldr/arch/i386/xboxfont.c > + freeldr/freeldr/arch/i386/xboxhw.c > + freeldr/freeldr/arch/i386/xboxi2c.c > + freeldr/freeldr/arch/i386/xboxmem.c > + freeldr/freeldr/arch/i386/xboxrtc.c > + freeldr/freeldr/arch/i386/xboxvideo.c > + freeldr/freeldr/windows/i386/ntsetup.c > + freeldr/freeldr/windows/i386/wlmemory.c) > +else() > +#TBD > +endif(ARCH MATCHES i386) > + > +set_source_files_properties(${FREELDR_ARCH_SOURCE} PROPERTIES COMPILE_DEFINITIONS "_NTHAL_;_BLDR_;_NTSYSTEM_") > + > +list(APPEND SETUPLDR_MAIN_SOURCE > + freeldr/freeldr/bootmgr.c > + freeldr/freeldr/inffile/inffile.c > + freeldr/freeldr/reactos/setupldr.c) > + > +if(ARCH MATCHES i386) > +list(APPEND SETUPLDR_MAIN_SOURCE freeldr/freeldr/windows/setupldr2.c) > +elseif(ARCH MATCHES amd64) > +list(APPEND SETUPLDR_MAIN_SOURCE freeldr/freeldr/windows/setupldr2.c) > +endif(ARCH MATCHES i386) > + > +set_source_files_properties(${SETUPLDR_MAIN_SOURCE} PROPERTIES COMPILE_DEFINITIONS "_NTHAL_;FREELDR_REACTOS_SETUP" COMPILE_FLAGS "-ffreestanding -fno-builtin -fno-inline -fno-zero-initialized-in-bss") > + > +set(CMAKE_C_CREATE_SHARED_LIBRARY "<CMAKE_C_COMPILER> <CMAKE_SHARED_LIBRARY_C_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>") > + > +list(APPEND FREELDR_SOURCE > + freeldr/freeldr/bootmgr.c > + ${FREELDR_STARTUP_SOURCE} > + ${FREELDR_BASE64K_SOURCE} > + ${FREELDR_BASE_SOURCE} > + ${FREELDR_ARCH_SOURCE}) > + > +add_library(freeldr SHARED > + ${CMAKE_CURRENT_BINARY_DIR}/freeldr_freeldr.h.gch > + ${FREELDR_SOURCE}) > + > +set_target_properties(freeldr PROPERTIES LINK_FLAGS "-Wl,--strip-all -Wl,-entry,_mainCRTStartup -Wl,--image-base,0x8000 -Wl,--exclude-all-symbols -Wl,--subsystem,native" SUFFIX ".sys") > + > +if(ARCH MATCHES i386) > +target_link_libraries(freeldr mini_hal) > +endif(ARCH MATCHES i386) > + > +target_link_libraries(freeldr > + rossym > + cmlib > + rtl > + libcntpr) > +add_pch(freeldr ${CMAKE_CURRENT_SOURCE_DIR}/freeldr/freeldr/include/freeldr.h ${FREELDR_SOURCE}) > + > +list(APPEND SETUPLDR_SOURCE > + ${FREELDR_STARTUP_SOURCE} > + ${FREELDR_BASE64K_SOURCE} > + ${FREELDR_BASE_SOURCE} > + ${FREELDR_ARCH_SOURCE} > + ${SETUPLDR_MAIN_SOURCE}) > + > +add_library(setupldr SHARED > + ${CMAKE_CURRENT_BINARY_DIR}/freeldr_freeldr.h.gch > + ${SETUPLDR_SOURCE}) > + > +set_target_properties(setupldr PROPERTIES LINK_FLAGS "-Wl,--strip-all -Wl,-entry,_mainCRTStartup -Wl,--image-base,0x8000 -Wl,--exclude-all-symbols -Wl,--subsystem,native" SUFFIX ".sys") > + > +if(ARCH MATCHES i386) > +target_link_libraries(setupldr mini_hal) > +endif(ARCH MATCHES i386) > + > +target_link_libraries(setupldr > + rossym > + cmlib > + rtl > + libcntpr) > +add_pch(setupldr ${CMAKE_CURRENT_SOURCE_DIR}/freeldr/freeldr/include/freeldr.h ${SETUPLDR_SOURCE}) > > Copied: branches/cmake-bringup/boot/freeldr/freeldr/arch/i386/fathelp.S (from r48568, branches/cmake-bringup/boot/freeldr/freeldr/arch/i386/fathelp.asm) > URL: http://svn.reactos.org/svn/reactos/branches/cmake-bringup/boot/freeldr/free… > ============================================================================== > --- branches/cmake-bringup/boot/freeldr/freeldr/arch/i386/fathelp.asm [iso-8859-1] (original) > +++ branches/cmake-bringup/boot/freeldr/freeldr/arch/i386/fathelp.S [iso-8859-1] Thu Sep 2 17:39:45 2010 > @@ -1,226 +1,222 @@ > -; FATHELP.ASM > -; FAT12/16 Boot Sector Helper Code > -; Copyright (c) 1998, 2001, 2002, 2003 Brian Palmer > - > - > - > -;org 8000h > - > -segment .text > - > -bits 16 > - > - > -BootSectorStackTop equ 0x7bf2 > -DataAreaStartHigh equ 0x2 > -DataAreaStartLow equ 0x4 > -BiosCHSDriveSizeHigh equ 0x6 > -BiosCHSDriveSizeLow equ 0x8 > -BiosCHSDriveSize equ 0x8 > -ReadSectorsOffset equ 0xa > -ReadClusterOffset equ 0xc > -PutCharsOffset equ 0xe > - > -OEMName equ 3 > -BytesPerSector equ 11 > -SectsPerCluster equ 13 > -ReservedSectors equ 14 > -NumberOfFats equ 16 > -MaxRootEntries equ 17 > -TotalSectors equ 19 > -MediaDescriptor equ 21 > -SectorsPerFat equ 22 > -SectorsPerTrack equ 24 > -NumberOfHeads equ 26 > -HiddenSectors equ 28 > -TotalSectorsBig equ 32 > -BootDrive equ 36 > -Reserved equ 37 > -ExtendSig equ 38 > -SerialNumber equ 39 > -VolumeLabel equ 43 > -FileSystem equ 54 > - > -BootPartition equ 0x7dfd > +// FATHELP.ASM > +// FAT12/16 Boot Sector Helper Code > +// Copyright (c) 1998, 2001, 2002, 2003 Brian Palmer > + > + .text > + .code16 > + .intel_syntax > + > +#define BootSectorStackTop 0x7bf2 > +#define DataAreaStartHigh 0x2 > +#define DataAreaStartLow 0x4 > +#define BiosCHSDriveSizeHigh 0x6 > +#define BiosCHSDriveSizeLow 0x8 > +#define BiosCHSDriveSize 0x8 > +#define ReadSectorsOffset 0xa > +#define ReadClusterOffset 0xc > +#define PutCharsOffset 0xe > + > +#define OEMName 3 > +#define BytesPerSector 11 > +#define SectsPerCluster 13 > +#define ReservedSectors 14 > +#define NumberOfFats 16 > +#define MaxRootEntries 17 > +#define TotalSectors 19 > +#define MediaDescriptor 21 > +#define SectorsPerFat 22 > +#define SectorsPerTrack 24 > +#define NumberOfHeads 26 > +#define HiddenSectors 28 > +#define TotalSectorsBig 32 > +#define BootDrive 36 > +#define Reserved 37 > +#define ExtendSig 38 > +#define SerialNumber 39 > +#define VolumeLabel 43 > +#define FileSystem 54 > + > +#define BootPartition 0x7dfd > > > -; This code will be stored in the first 512 bytes > -; of freeldr.sys. The first 3 bytes will be a jmp > -; instruction to skip past the FAT helper code > -; that is stored in the rest of the 512 bytes. > -; > -; This code is loaded at 0000:8000 so we have to > -; encode a jmp instruction to jump to 0000:8200 > - > -global _mainCRTStartup ; For Mingw32 builds where the linker looks for this symbol > +// This code will be stored in the first 512 bytes > +// of freeldr.sys. The first 3 bytes will be a jmp > +// instruction to skip past the FAT helper code > +// that is stored in the rest of the 512 bytes. > +// > +// This code is loaded at 0000:8000 so we have to > +// encode a jmp instruction to jump to 0000:8200 > + > +.globl _mainCRTStartup /* For Mingw32 builds where the linker looks for this symbol */ > _mainCRTStartup: > -global start > +.globl start > start: > - db 0xe9 > - db 0xfd > - db 0x01 > - > -; Now starts the extra boot code that we will store > -; in the first 512 bytes of freeldr.sys. This code > -; allows the FAT12/16 bootsector to navigate the > -; FAT table so that we can still load freeldr.sys > -; even if it is fragmented. > + .byte 0xe9 > + .byte 0xfd > + .byte 0x01 > + > +// Now starts the extra boot code that we will store > +// in the first 512 bytes of freeldr.sys. This code > +// allows the FAT12/16 bootsector to navigate the > +// FAT table so that we can still load freeldr.sys > +// even if it is fragmented. > > > FatHelperEntryPoint: > > - push ax ; First save AX - the start cluster of freeldr.sys > - > - > - ; Display "Loading FreeLoader..." message > - mov esi,msgLoading ; Loading message > - call [bp-PutCharsOffset] ; Display it > + push %ax /* First save AX - the start cluster of freeldr.sys */ > + > + > + // Display "Loading FreeLoader..." message > + mov %esi,msgLoading /* Loading message */ > + call [%bp-PutCharsOffset] /* Display it */ > > > call ReadFatIntoMemory > > - pop ax ; Restore AX (start cluster) > - ; AX has start cluster of freeldr.sys > - > - mov bx,800h > - mov es,bx > + pop %ax /* Restore AX (start cluster) */ > + // AX has start cluster of freeldr.sys > + > + mov %bx,0x800 > + mov %es,%bx > > LoadFile: > - push ax > + push %ax > call IsFat12 > - pop ax > + pop %ax > jnc LoadFile2 > - cmp ax,0ff8h ; Check to see if this is the last cluster in the chain > + cmp %ax,0xff8 /* Check to see if this is the last cluster in the chain */ > jmp LoadFile3 > LoadFile2: > - cmp ax,0fff8h > + cmp %ax,0xfff8 > LoadFile3: > - jae LoadFile_Done ; If so continue, if not then read then next one > - push ax > - xor bx,bx ; Load ROSLDR starting at 0000:8000h > - push es > - call [bp-ReadClusterOffset] > - pop es > - > - xor bx,bx > - mov bl,BYTE [BYTE bp+SectsPerCluster] > - shl bx,5 ; BX = BX * 512 / 16 > - mov ax,es ; Increment the load address by > - add ax,bx ; The size of a cluster > - mov es,ax > + jae LoadFile_Done /* If so continue, if not then read then next one */ > + push %ax > + xor %bx,%bx /* Load ROSLDR starting at 0000:8000h */ > + push %es > + call [%bp-ReadClusterOffset] > + pop %es > + > + xor %bx,%bx > + mov %bl,BYTE [%bp+SectsPerCluster] > + shl %bx,5 /* BX = BX * 512 / 16 */ > + mov %ax,%es /* Increment the load address by */ > + add %ax,%bx /* The size of a cluster */ > + mov %es,%ax > > call IsFat12 > - pop ax > - push es > + pop %ax > + push %es > jnc LoadFile4 > - call GetFatEntry12 ; Get the next entry > + call GetFatEntry12 /* Get the next entry */ > jmp LoadFile5 > LoadFile4: > call GetFatEntry16 > LoadFile5: > - pop es > - > - jmp LoadFile ; Load the next cluster (if any) > + pop %es > + > + jmp LoadFile /* Load the next cluster (if any) */ > > LoadFile_Done: > - mov dl,BYTE [BYTE bp+BootDrive] ; Load the boot drive into DL > - mov dh,[BootPartition] ; Load the boot partition into DH > - > - push 0 ; push segment (0x0000) > - mov bx, [0x8000 + 0xA8] ; load the RVA of the EntryPoint into eax > - add bx, 0x8000 ; RVA -> VA and skip 3 bytes (jump to fathelper code) > - push bx ; push offset > - retf ; Transfer control to FreeLoader > - > -; Reads the entire FAT into memory at 7000:0000 > + mov %dl,BYTE [%bp+BootDrive] /* Load the boot drive into DL */ > + mov %dh,[BootPartition] /* Load the boot partition into DH */ > + > + push 0 /* push segment (0x0000) */ > + mov %bx, [0x80A8] /* load the RVA of the EntryPoint into eax */ > + add %bx, 0x8000 /* RVA -> VA and skip 3 bytes (jump to fathelper code) */ > + push %bx /* push offset */ > + retf /* Transfer control to FreeLoader */ > + > +// Reads the entire FAT into memory at 7000:0000 > ReadFatIntoMemory: > - mov ax,WORD [BYTE bp+HiddenSectors] > - mov dx,WORD [BYTE bp+HiddenSectors+2] > - add ax,WORD [BYTE bp+ReservedSectors] > - adc dx,byte 0 > - mov cx,WORD [BYTE bp+SectorsPerFat] > - mov bx,7000h > - mov es,bx > - xor bx,bx > - call [bp-ReadSectorsOffset] > - ret > - > - > -; Returns the FAT entry for a given cluster number for 16-bit FAT > -; On entry AX has cluster number > -; On return AX has FAT entry for that cluster > + mov %ax,WORD [%bp+HiddenSectors] > + mov %dx,WORD [%bp+HiddenSectors+2] > + add %ax,WORD [%bp+ReservedSectors] > + adc %dx,0 > + mov %cx,WORD [%bp+SectorsPerFat] > + mov %bx,0x7000 > + mov %es,%bx > + xor %bx,%bx > + call [%bp-ReadSectorsOffset] > + ret > + > + > +// Returns the FAT entry for a given cluster number for 16-bit FAT > +// On entry AX has cluster number > +// On return AX has FAT entry for that cluster > GetFatEntry16: > > - mov cx,2 ; AX = AX * 2 (since FAT16 entries are 2 bytes) > - mul cx > - shl dx,12 > - > - mov bx,7000h > - add bx,dx > - mov es,bx > - mov bx,ax ; Restore FAT entry offset > - mov ax,WORD [es:bx] ; Get FAT entry > - > - ret > - > - > -; Returns the FAT entry for a given cluster number for 12-bit FAT > -; On entry AX has cluster number > -; On return AX has FAT entry for that cluster > + mov %cx,2 /* AX = AX * 2 (since FAT16 entries are 2 bytes) */ > + mul %cx > + shl %dx,12 > + > + mov %bx,0x7000 > + add %bx,%dx > + mov %es,%bx > + mov %bx,%ax /* Restore FAT entry offset */ > + es mov %ax,WORD [%bx] /* Get FAT entry */ > + > + ret > + > + > +// Returns the FAT entry for a given cluster number for 12-bit FAT > +// On entry AX has cluster number > +// On return AX has FAT entry for that cluster > GetFatEntry12: > > - push ax > - mov cx,ax > - shr ax,1 > - add ax,cx ; AX = AX * 1.5 (AX = AX + (AX / 2)) (since FAT12 entries are 12 bits) > - > - mov bx,7000h > - mov es,bx > - mov bx,ax ; Put FAT entry offset into BX > - mov ax,WORD [es:bx] ; Get FAT entry > - pop cx ; Get cluster number from stack > - and cx,1 > + push %ax > + mov %cx,%ax > + shr %ax,1 > + add %ax,%cx /* AX = AX * 1.5 (AX = AX + (AX / 2)) (since FAT12 entries are 12 bits) */ > + > + mov %bx,0x7000 > + mov %es,%bx > + mov %bx,%ax /* Put FAT entry offset into BX */ > + es mov %ax,WORD [%bx] /* Get FAT entry */ > + pop %cx /* Get cluster number from stack */ > + and %cx,1 > jz UseLow12Bits > - and ax,0fff0h > - shr ax,4 > + and %ax,0xfff0 > + shr %ax,4 > jmp GetFatEntry12_Done > > UseLow12Bits: > - and ax,0fffh > + and %ax,0x0fff > > GetFatEntry12_Done: > > ret > > > -; Returns CF = 1 if this is a FAT12 file system > -; Otherwise CF = 0 for FAT16 > +// Returns CF = 1 if this is a FAT12 file system > +// Otherwise CF = 0 for FAT16 > IsFat12: > > - mov ebx,DWORD [BYTE bp-DataAreaStartLow] > - ; EBX now has the number of the starting sector of the data area > - ; starting from the beginning of the disk, so subtrace hidden sectors > - sub ebx,DWORD [BYTE bp+HiddenSectors] > - > - > - xor eax,eax > - mov ax,WORD [BYTE bp+TotalSectors] > - cmp ax,byte 0 > + mov %ebx,DWORD [%bp-DataAreaStartLow] > + // EBX now has the number of the starting sector of the data area > + // starting from the beginning of the disk, so subtrace hidden sectors > + sub %ebx,DWORD [%bp+HiddenSectors] > + > + > + xor %eax,%eax > + mov %ax,WORD [%bp+TotalSectors] > + cmp %ax,0 > jnz IsFat12_2 > - mov eax,DWORD [BYTE bp+TotalSectorsBig] > - > - ; EAX now contains the number of sectors on the volume > + mov %eax,DWORD [%bp+TotalSectorsBig] > + > + // EAX now contains the number of sectors on the volume > > IsFat12_2: > - sub eax,ebx ; Subtract data area start sector > - xor edx,edx ; from total sectors of volume > - > - ; EDX:EAX now contains the number of data sectors on the volume > - movzx ebx,BYTE [BYTE bp+SectsPerCluster] > - div ebx > - ; EAX now has the number of clusters on the volume > + sub %eax,%ebx /* Subtract data area start sector */ > + xor %edx,%edx /* from total sectors of volume */ > + > + // EDX:EAX now contains the number of data sectors on the volume > + xor %ebx,%ebx > + mov %bl,BYTE [%bp+SectsPerCluster] > + div %ebx > + // EAX now has the number of clusters on the volume > stc > - cmp eax,4085 > + cmp %eax,4085 > jb IsFat12_Done > clc > > @@ -229,7 +225,9 @@ > > > > -msgLoading db 'Loading FreeLoader...',0dh,0ah,0 > - > - times 510-($-$$) db 0 ; Pad to 510 bytes > - dw 0aa55h ; BootSector signature > +msgLoading: > + .asciz "Loading FreeLoader...\r\n" > + > + .org 0x1fe > +blockend: > + .word 0x0aa55 /* BootSector signature */ > > Removed: branches/cmake-bringup/boot/freeldr/freeldr/arch/i386/fathelp.asm > URL: http://svn.reactos.org/svn/reactos/branches/cmake-bringup/boot/freeldr/free… > ============================================================================== > --- branches/cmake-bringup/boot/freeldr/freeldr/arch/i386/fathelp.asm [iso-8859-1] (original) > +++ branches/cmake-bringup/boot/freeldr/freeldr/arch/i386/fathelp.asm (removed) > @@ -1,235 +1,0 @@ > -; FATHELP.ASM > -; FAT12/16 Boot Sector Helper Code > -; Copyright (c) 1998, 2001, 2002, 2003 Brian Palmer > - > - > - > -;org 8000h > - > -segment .text > - > -bits 16 > - > - > -BootSectorStackTop equ 0x7bf2 > -DataAreaStartHigh equ 0x2 > -DataAreaStartLow equ 0x4 > -BiosCHSDriveSizeHigh equ 0x6 > -BiosCHSDriveSizeLow equ 0x8 > -BiosCHSDriveSize equ 0x8 > -ReadSectorsOffset equ 0xa > -ReadClusterOffset equ 0xc > -PutCharsOffset equ 0xe > - > -OEMName equ 3 > -BytesPerSector equ 11 > -SectsPerCluster equ 13 > -ReservedSectors equ 14 > -NumberOfFats equ 16 > -MaxRootEntries equ 17 > -TotalSectors equ 19 > -MediaDescriptor equ 21 > -SectorsPerFat equ 22 > -SectorsPerTrack equ 24 > -NumberOfHeads equ 26 > -HiddenSectors equ 28 > -TotalSectorsBig equ 32 > -BootDrive equ 36 > -Reserved equ 37 > -ExtendSig equ 38 > -SerialNumber equ 39 > -VolumeLabel equ 43 > -FileSystem equ 54 > - > -BootPartition equ 0x7dfd > - > - > -; This code will be stored in the first 512 bytes > -; of freeldr.sys. The first 3 bytes will be a jmp > -; instruction to skip past the FAT helper code > -; that is stored in the rest of the 512 bytes. > -; > -; This code is loaded at 0000:8000 so we have to > -; encode a jmp instruction to jump to 0000:8200 > - > -global _mainCRTStartup ; For Mingw32 builds where the linker looks for this symbol > -_mainCRTStartup: > -global start > -start: > - db 0xe9 > - db 0xfd > - db 0x01 > - > -; Now starts the extra boot code that we will store > -; in the first 512 bytes of freeldr.sys. This code > -; allows the FAT12/16 bootsector to navigate the > -; FAT table so that we can still load freeldr.sys > -; even if it is fragmented. > - > - > -FatHelperEntryPoint: > - > - push ax ; First save AX - the start cluster of freeldr.sys > - > - > - ; Display "Loading FreeLoader..." message > - mov esi,msgLoading ; Loading message > - call [bp-PutCharsOffset] ; Display it > - > - > - call ReadFatIntoMemory > - > - pop ax ; Restore AX (start cluster) > - ; AX has start cluster of freeldr.sys > - > - mov bx,800h > - mov es,bx > - > -LoadFile: > - push ax > - call IsFat12 > - pop ax > - jnc LoadFile2 > - cmp ax,0ff8h ; Check to see if this is the last cluster in the chain > - jmp LoadFile3 > -LoadFile2: > - cmp ax,0fff8h > -LoadFile3: > - jae LoadFile_Done ; If so continue, if not then read then next one > - push ax > - xor bx,bx ; Load ROSLDR starting at 0000:8000h > - push es > - call [bp-ReadClusterOffset] > - pop es > - > - xor bx,bx > - mov bl,BYTE [BYTE bp+SectsPerCluster] > - shl bx,5 ; BX = BX * 512 / 16 > - mov ax,es ; Increment the load address by > - add ax,bx ; The size of a cluster > - mov es,ax > - > - call IsFat12 > - pop ax > - push es > - jnc LoadFile4 > - call GetFatEntry12 ; Get the next entry > - jmp LoadFile5 > -LoadFile4: > - call GetFatEntry16 > -LoadFile5: > - pop es > - > - jmp LoadFile ; Load the next cluster (if any) > - > -LoadFile_Done: > - mov dl,BYTE [BYTE bp+BootDrive] ; Load the boot drive into DL > - mov dh,[BootPartition] ; Load the boot partition into DH > - > - push 0 ; push segment (0x0000) > - mov bx, [0x8000 + 0xA8] ; load the RVA of the EntryPoint into eax > - add bx, 0x8000 ; RVA -> VA and skip 3 bytes (jump to fathelper code) > - push bx ; push offset > - retf ; Transfer control to FreeLoader > - > -; Reads the entire FAT into memory at 7000:0000 > -ReadFatIntoMemory: > - mov ax,WORD [BYTE bp+HiddenSectors] > - mov dx,WORD [BYTE bp+HiddenSectors+2] > - add ax,WORD [BYTE bp+ReservedSectors] > - adc dx,byte 0 > - mov cx,WORD [BYTE bp+SectorsPerFat] > - mov bx,7000h > - mov es,bx > - xor bx,bx > - call [bp-ReadSectorsOffset] > - ret > - > - > -; Returns the FAT entry for a given cluster number for 16-bit FAT > -; On entry AX has cluster number > -; On return AX has FAT entry for that cluster > -GetFatEntry16: > - > - mov cx,2 ; AX = AX * 2 (since FAT16 entries are 2 bytes) > - mul cx > - shl dx,12 > - > - mov bx,7000h > - add bx,dx > - mov es,bx > - mov bx,ax ; Restore FAT entry offset > - mov ax,WORD [es:bx] ; Get FAT entry > - > - ret > - > - > -; Returns the FAT entry for a given cluster number for 12-bit FAT > -; On entry AX has cluster number > -; On return AX has FAT entry for that cluster > -GetFatEntry12: > - > - push ax > - mov cx,ax > - shr ax,1 > - add ax,cx ; AX = AX * 1.5 (AX = AX + (AX / 2)) (since FAT12 entries are 12 bits) > - > - mov bx,7000h > - mov es,bx > - mov bx,ax ; Put FAT entry offset into BX > - mov ax,WORD [es:bx] ; Get FAT entry > - pop cx ; Get cluster number from stack > - and cx,1 > - jz UseLow12Bits > - and ax,0fff0h > - shr ax,4 > - jmp GetFatEntry12_Done > - > -UseLow12Bits: > - and ax,0fffh > - > -GetFatEntry12_Done: > - > - ret > - > - > -; Returns CF = 1 if this is a FAT12 file system > -; Otherwise CF = 0 for FAT16 > -IsFat12: > - > - mov ebx,DWORD [BYTE bp-DataAreaStartLow] > - ; EBX now has the number of the starting sector of the data area > - ; starting from the beginning of the disk, so subtrace hidden sectors > - sub ebx,DWORD [BYTE bp+HiddenSectors] > - > - > - xor eax,eax > - mov ax,WORD [BYTE bp+TotalSectors] > - cmp ax,byte 0 > - jnz IsFat12_2 > - mov eax,DWORD [BYTE bp+TotalSectorsBig] > - > - ; EAX now contains the number of sectors on the volume > - > -IsFat12_2: > - sub eax,ebx ; Subtract data area start sector > - xor edx,edx ; from total sectors of volume > - > - ; EDX:EAX now contains the number of data sectors on the volume > - movzx ebx,BYTE [BYTE bp+SectsPerCluster] > - div ebx > - ; EAX now has the number of clusters on the volume > - stc > - cmp eax,4085 > - jb IsFat12_Done > - clc > - > -IsFat12_Done: > - ret > - > - > - > -msgLoading db 'Loading FreeLoader...',0dh,0ah,0 > - > - times 510-($-$$) db 0 ; Pad to 510 bytes > - dw 0aa55h ; BootSector signature > > >

9 11

Re: [ros-dev] [ros-diffs] [ekohl] 48722: [USETUP] Allocate a drive layout buffer that is l
by Pierre Schweitzer 07 Sep '10

07 Sep '10

Hi, why reimplementing an unsecure IoReadPartitionTable version? It even looks like IoReadPartitionTableEx() which may arrive soon in ReactOS ;). Best regards, P. Schweitzer

1 0

Re: [ros-dev] Usetup
by Love Nystrom 07 Sep '10

07 Sep '10

Hi, What You say makes sense of course. I can't find time to dig into the code, but it sounds like you acted correctly. We can of course improve the setup behavior as time goes and we learn how to do it right with various boot managers, no need to take after Microsoft here, but there will always be cases when we don't know how to wedge the boot in. We can always, as long as there is a free partition or free space to create one, get as far as installing the OS and it's partition boot, but may be unable to install a master boot, if the user has an unknown boot manager we don't recognize One way to deal with it would be to chain the master boot. That is, we save the original master boot to a file, and implement a query in our own master boot, whether the user want to boot ROS, or continue with the original master boot. It would be a small matter to load the original master boot and giving control over to it if need be. Sure, it's one more pit-stop on the way to OS, but it would take care of all the cases we cannot know, or cannot handle. Best Regards L from Hell Eric Kohl <eric.kohl(a)t-online.de> wrote: > Hi! > > Being cooperative was my intention when I wrote this part of usetup. > The bad thing about this approach is that usetup needs to deal with > all kinds of different situations that developers cannot even think > about. The only proper way to fix this situation was: "Don't touch it > if you don't know how to deal with it!" The result was that usetup > could only handle empty harddisks and Windows boot managers correctly. > Except for these two cases there are lots of different situations that > a setup application cannot deal with. That's where the user must fix > things. That's why usetup enables users to save the bootsector to a > floppy disk. This enables them to fix the unknown situations > themselves. Unfortunately this means that newbies might not be able to > install the bootcode properly. But I thought it was better not to > overwrite a bootsector that to unintentionally damage a system. > > The question how to handle this correctly is a difficult one. > Microsoft chose the easy way as they behave like they are the owner of > the system and overwrite everything as they see fit. But implementing > this part of the setup in a way that fits everyones needs is a very > difficult task. Just think about the different filesystems and > different versions of LILO and GRUB and what about other third-party > boot-managers... > > Regards, > Eric

1 0

[ros-diffs] [cgutman] 48700: [USETUP] - Remove code that was corrupting disk data and causing setup to fail in rare cases - Write the MBR in all cases (Windows setup behavior too) - We can overwrite GRUB and L...
by James Tabor 05 Sep '10

05 Sep '10

Hi! Please test this with GRUB and LILO, since I use LILO on my main hardware test. I do not have access to it for the moment. During the installation of the boot CD, I do not overwrite the MBR. I just hope it works when I get back to work with the project. Thanks, James

5 4

Re: [ros-dev] Convert fat12/16 boot sector helper code to gas syntax.
by Love Nystrom 04 Sep '10

04 Sep '10

Second that. If it ain't broke, don't bloody "fix" it. Best Regards L from Hell Alex Ionescu <ionucu(a)videotron.ca>: > This is retarded, GAS supports Intel syntax. Why did this require > rewriting everything in AT&T syntax and introducing bugs? And what's > up with calling AT&T syntax "GAS" Syntax. > > I wonder what Brian would say.... > > It's funny how this project gets rid of old developers, gets new > developers, and has them make the same mistakes/idiotic things the old > developers left for in the first place... > > Good job! > > Best regards, > Alex Ionescu > >

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