SeaBIOS February 2012

seabios@seabios.org

27 participants
67 discussions

Re: [SeaBIOS] Is there a limit on the stack
by Kevin O'Connor 14 Feb '12

14 Feb '12

On Tue, Feb 14, 2012 at 08:34:22AM +0900, Daniel Castro wrote: > Hello All, > > I am manipulating a lot of strings inside in the 32 bit init code, > mostly by creating a pointer to char on the stack, and allocating the > memory with malloc_high, but is done more than 20 times in some parts > of the method. Lately I have seen that whenever I reference a pointer > that was defined and used in the beginning I will get a fault, so I I'm not sure what you mean by "fault". SeaBIOS should be running without any memory protection, so it shouldn't ever cause a cpu trap (unless it read/wrote to somewhere above the top of ram). The 32bit init code runs with a stack at 0x7000 - so this should give about 26K of stack. If the code is running in a "thread", then the stack is 4k. The 32bit "resume" handler has a ~3K stack. Finally, the 16bit code has a severely restrained stack (as little as a couple hundred bytes). -Kevin

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Is there a limit on the stack
by Daniel Castro 13 Feb '12

13 Feb '12

Hello All, I am manipulating a lot of strings inside in the 32 bit init code, mostly by creating a pointer to char on the stack, and allocating the memory with malloc_high, but is done more than 20 times in some parts of the method. Lately I have seen that whenever I reference a pointer that was defined and used in the beginning I will get a fault, so I thought that maybe there is some kind of limitation on the stack or the memory area that is overwriting some of my variables or data in the stack or in the memory. For example I define a variable in the stack like char * device = malloc_high(10); then I copy some string to that space, memcpy(device,old_device,10): Many lines later I try to do this: dprintf(1,"My current device is: %s",device); The printf will generate a fault, also if I try this: dprintf(1,"Device is currently at %p",device); This will also generate a fault, so my guess is that the pointer was lost somehow in the stack. Any ideas? Thanks, Daniel -- +-=====---------------------------+ | +---------------------------------+ | This space intentionally blank for notetaking. | | | Daniel Castro, | | | | Consultant/Programmer.| | | | U Andes | +-------------------------------------+

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Problem with Debug lvl under XEN
by Daniel Castro 13 Feb '12

13 Feb '12

Hello, I have encountered something a little strange, if I set up the debug lvl to 3 or more Y will get a Triple VCPU fault. If I set it to 1 the bios runs normally but I loose a lot of information that I need to debug. Sometimes if I try to print char * variables regardless of the debug level I still get the fault. Any ideas why? Thanks for the ideas/pointers/ anything! Daniel -- +-=====---------------------------+ | +---------------------------------+ | This space intentionally blank for notetaking. | | | Daniel Castro, | | | | Consultant/Programmer.| | | | U Andes | +-------------------------------------+

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[PATCH] disk: fail LBA I/O with zero sector count
by Paolo Bonzini 13 Feb '12

13 Feb '12

Unlike basic_access, extended_access does not check for a zero sector count. However, this is a problem because for example it would be interpreted as 256 when processing an ATA request. Signed-off-by: Paolo Bonzini <pbonzini(a)redhat.com> --- src/disk.c | 14 +++++++++----- 1 files changed, 9 insertions(+), 5 deletions(-) diff --git a/src/disk.c b/src/disk.c index f2c6621..a124a0f 100644 --- a/src/disk.c +++ b/src/disk.c @@ -127,20 +127,24 @@ extended_access(struct bregs *regs, struct drive_s *drive_g, u16 command) dop.lba = GET_INT13EXT(regs, lba); dop.command = command; dop.drive_g = drive_g; - if (dop.lba >= GET_GLOBAL(drive_g->sectors)) { - warn_invalid(regs); - disk_ret(regs, DISK_RET_EPARAM); - return; - } + if (dop.lba >= GET_GLOBAL(drive_g->sectors)) + goto fail; dop.buf_fl = SEGOFF_TO_FLATPTR(GET_INT13EXT(regs, data)); dop.count = GET_INT13EXT(regs, count); + if (dop.count == 0) + goto fail; int status = send_disk_op(&dop); SET_INT13EXT(regs, count, dop.count); disk_ret(regs, status); + return; + +fail: + warn_invalid(regs); + disk_ret(regs, DISK_RET_EPARAM); } -- 1.7.7.6

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Time for a new release?
by Fred . 09 Feb '12

09 Feb '12

Lots of stuff have been happening lately (namely VGA and VBE related stuff). Also some fixes. Perhaps it is time for a new release soon?

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[PATCH 0/5] rom build scripting, switch vgabios implementation
by Gerd Hoffmann 09 Feb '12

09 Feb '12

Hi folks, There is a vgabios sitting implementation in the seabios repository for a while. Recently it got a huge overhaul and should be on-par with the lgpl vgabios implementation. I'd like to see qemu switch to that implementation, for very simliar reasons which made us switch from bochs bios to seabios. The vgabios is written almost completely in C, thus it is easier to modify and maintain. We have a very responsitive upstream. This patch series adds some build magic to roms/, for two reasons: It simplifies updates and documents the build process. Covers seabios and vgabios for now. Anyone who is familier with the build process for other roms (ipxe, openbios, slof, ...) is welcome to add more bits there. seabios submodule is updated to latest master (mirroring @ qemu.org seems to be broken btw, had to pull from seabios.org directly), vgabios and seabios binaries are updated. Tests, comments etc, are welcome. cheers, Gerd The following changes since commit cf4dc461a4cfc3e056ee24edb26154f4d34a6278: Restore consistent formatting (2012-02-07 22:11:04 +0400) are available in the git repository at: git://git.kraxel.org/qemu bios.1 Gerd Hoffmann (5): update seabios to latest master [feb 9th] Add vgabios build scripts to roms/ Update vgabios binaries Add seabios build scripts to roms/ Update seabios binary pc-bios/bios.bin | Bin 131072 -> 131072 bytes pc-bios/vgabios-cirrus.bin | Bin 35840 -> 37376 bytes pc-bios/vgabios-qxl.bin | Bin 40448 -> 37376 bytes pc-bios/vgabios-stdvga.bin | Bin 40448 -> 37376 bytes pc-bios/vgabios-vmware.bin | Bin 40448 -> 37376 bytes roms/Makefile | 23 +++++++++++++++++++++++ roms/config.seabios | 1 + roms/config.vga.cirrus | 3 +++ roms/config.vga.isavga | 3 +++ roms/config.vga.qxl | 6 ++++++ roms/config.vga.stdvga | 3 +++ roms/config.vga.vmware | 6 ++++++ roms/configure-seabios.sh | 5 +++++ roms/seabios | 2 +- 14 files changed, 51 insertions(+), 1 deletions(-) create mode 100644 roms/Makefile create mode 100644 roms/config.seabios create mode 100644 roms/config.vga.cirrus create mode 100644 roms/config.vga.isavga create mode 100644 roms/config.vga.qxl create mode 100644 roms/config.vga.stdvga create mode 100644 roms/config.vga.vmware create mode 100755 roms/configure-seabios.sh

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seabios build failure in xen tree
by Christoph Egger 09 Feb '12

09 Feb '12

Adding seabios ML. On 01/26/12 16:06, Ian Campbell wrote: > On Thu, 2012-01-26 at 15:01 +0000, Christoph Egger wrote: >> On 01/26/12 15:51, Ian Campbell wrote: >>> On Thu, 2012-01-26 at 14:35 +0000, Christoph Egger wrote: >>>> gmake[6]: Entering directory tools/firmware/seabios-dir-remote >>>> Building ld scripts (version "1.6.3.1-20120126_152501") >>>> env: python: No such file or directory >>>> gmake[6]: *** [out/romlayout16.lds] Error 127 >>>> >>>> >>>> The python scripts must be invoked with $(PYTHON) as done >>>> throughout the build system. >>> >>> SeaBIOS uses: >>> $ rgrep -i python tools/firmware/seabios-dir >>> tools/firmware/seabios-dir/tools/transdump.py:#!/usr/bin/env python >>> tools/firmware/seabios-dir/tools/buildrom.py:#!/usr/bin/env python >>> tools/firmware/seabios-dir/tools/checkstack.py:#!/usr/bin/env python >>> tools/firmware/seabios-dir/tools/encodeint.py:#!/usr/bin/env python >>> tools/firmware/seabios-dir/tools/layoutrom.py:#!/usr/bin/env python >>> tools/firmware/seabios-dir/tools/checkrom.py:#!/usr/bin/env python >>> tools/firmware/seabios-dir/tools/readserial.py:#!/usr/bin/env python >>> tools/firmware/seabios-dir/tools/readserial.py:Or: apt-get install python-serial >>> tools/firmware/seabios-dir/tools/checksum.py:#!/usr/bin/env python >>> >>> Does this not work? Should python be on your $PATH? >> >> It is. But the python binary on NetBSD's pkgsrc >> is called python<version> to allow concurrent installations of different >> python versions. >> So I can have: python2.5, python2.6, python2.7, python3.1, etc. > > There is no current "python" referring to the default version? > > I think this is something you will need to work out with the SeaBIOS > upstream. > > Ian. > >> >> Christoph >> >>> >>> Since SeaBIOS is third party code we are not so much at liberty to make >>> the same sorts of policy decisions as we would for our own code. >>> >>> You could perhaps attempt to work around this by invoking the recursive >>> make into the seabios directory with PATH=$(dir-only $(PYTHON):$PATH or >>> whatever the appropriate runes are. >>> >>> Or you could try posting a patch to SeaBIOS-devel, I don't know what >>> their thinking on this sort of thing is. I see. What python version does SeaBIOS require? I have python 2.5 installed. I manually created a python symlink to that version and then I get this failure: gmake[6]: Entering directory 'tools/firmware/seabios-dir-remote' Building ld scripts (version "1.6.3.1-20120127_151243") Fixed space: 0xe05b-0x10000 total: 8101 slack: 5 Percent slack: 0.1% 16bit size: 46336 32bit segmented size: 2005 32bit flat size: 14699 32bit flat init size: 53888 Traceback (most recent call last): File "./tools/layoutrom.py", line 579, in <module> main() File "./tools/layoutrom.py", line 576, in main writeLinkerScripts(sections, entrysym, genreloc, out16, out32seg, out32flag) File "./tools/layoutrom.py", line 257, in writeLinkerScripts + COMMONTRAILER TypeError: int argument required gmake[6]: *** [out/romlayout16.lds] Error 1 Christoph -- ---to satisfy European Law for business letters: Advanced Micro Devices GmbH Einsteinring 24, 85689 Dornach b. Muenchen Geschaeftsfuehrer: Alberto Bozzo, Andrew Bowd Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen Registergericht Muenchen, HRB Nr. 43632

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[PATCH 0/3] runtime hardware detection series.
by Gerd Hoffmann 09 Feb '12

09 Feb '12

Hi, Next round, this time introducing a CONFIG_VGA_QEMU and doing the hardware detection for qemu-emulated hardware only. Also clarifies Kconfig (cirrus is for emulated hardware only) as side effect. cheers, Gerd Gerd Hoffmann (3): vga: move code to vgahw.c vga: add pci hardware detection vga: add isa hardware detection Makefile | 2 +- vgasrc/Kconfig | 12 +-- vgasrc/bochsvga.c | 8 ++ vgasrc/bochsvga.h | 1 + vgasrc/clext.c | 6 ++ vgasrc/clext.h | 1 + vgasrc/vgabios.c | 2 +- vgasrc/vgahw.c | 199 +++++++++++++++++++++++++++++++++++++++++++++++++++++ vgasrc/vgahw.h | 151 +++++++++------------------------------- 9 files changed, 253 insertions(+), 129 deletions(-) create mode 100644 vgasrc/vgahw.c

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Re: [SeaBIOS] ImageMagick-based SeaBIOS logo generation script
by Gleb Natapov 09 Feb '12

09 Feb '12

On Wed, Feb 08, 2012 at 11:54:09AM +0100, Fred . wrote: > Kevin wanted the logo to be generated using scripted free and libre tools. > ImageMagick is scripted and free. > What else can I use? > ImageMagick is fine, but font file is Ubuntu specific (and may event contain different font in different versions of Ubuntu). If everyone agrees that this should be the SeaBIOS logo then find appropriately licensed fount file and include it in SeaBIOS repository along with the script. > On Wed, Feb 8, 2012 at 11:51 AM, Fred . <eldmannen(a)gmail.com> wrote: > > Well, then just execute the file and have it generate the jpg, and > > then put the jpg file in the source tree. > > ImageMagick is shipped by default on Ubuntu. > > > > On Wed, Feb 8, 2012 at 8:19 AM, Gleb Natapov <gleb(a)redhat.com> wrote: > >> On Tue, Feb 07, 2012 at 07:59:04PM +0100, Fred . wrote: > >>> Please put this file in the repository. I don't know, but somewhere. > >>> So it outputs a bootsplash.jpg file to wherever SeaBIOS is looking for > >>> that file. > >>> > >>> #!/bin/sh > >>> convert -background black \ > >>> -font /usr/share/fonts/truetype/ubuntu-font-family/Ubuntu-R.ttf \ > >> This file is hardly available on all machines where this script might > >> run. > >> > >>> -pointsize 96 -size 320x480 \ > >>> -gravity East -fill '#2078cb' label:'Sea' \ > >>> -gravity West -fill white label:'BIOS' \ > >>> +append bootsplash.jpg > >> > >> > >>> _______________________________________________ > >>> SeaBIOS mailing list > >>> SeaBIOS(a)seabios.org > >>> http://www.seabios.org/mailman/listinfo/seabios > >> > >> > >> -- > >> Gleb. -- Gleb.

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Re: [SeaBIOS] ImageMagick-based SeaBIOS logo generation script
by Fred . 08 Feb '12

08 Feb '12

Kevin wanted the logo to be generated using scripted free and libre tools. ImageMagick is scripted and free. What else can I use? On Wed, Feb 8, 2012 at 11:51 AM, Fred . <eldmannen(a)gmail.com> wrote: > Well, then just execute the file and have it generate the jpg, and > then put the jpg file in the source tree. > ImageMagick is shipped by default on Ubuntu. > > On Wed, Feb 8, 2012 at 8:19 AM, Gleb Natapov <gleb(a)redhat.com> wrote: >> On Tue, Feb 07, 2012 at 07:59:04PM +0100, Fred . wrote: >>> Please put this file in the repository. I don't know, but somewhere. >>> So it outputs a bootsplash.jpg file to wherever SeaBIOS is looking for >>> that file. >>> >>> #!/bin/sh >>> convert -background black \ >>> -font /usr/share/fonts/truetype/ubuntu-font-family/Ubuntu-R.ttf \ >> This file is hardly available on all machines where this script might >> run. >> >>> -pointsize 96 -size 320x480 \ >>> -gravity East -fill '#2078cb' label:'Sea' \ >>> -gravity West -fill white label:'BIOS' \ >>> +append bootsplash.jpg >> >> >>> _______________________________________________ >>> SeaBIOS mailing list >>> SeaBIOS(a)seabios.org >>> http://www.seabios.org/mailman/listinfo/seabios >> >> >> -- >> Gleb.

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SeaBIOS February 2012