1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/COPYING	Thu Dec 02 08:45:41 2010 +0200
     1.3 @@ -0,0 +1,674 @@
     1.4 +                    GNU GENERAL PUBLIC LICENSE
     1.5 +                       Version 3, 29 June 2007
     1.6 +
     1.7 + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
     1.8 + Everyone is permitted to copy and distribute verbatim copies
     1.9 + of this license document, but changing it is not allowed.
    1.10 +
    1.11 +                            Preamble
    1.12 +
    1.13 +  The GNU General Public License is a free, copyleft license for
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    1.16 +  The licenses for most software and other practical works are designed
    1.17 +to take away your freedom to share and change the works.  By contrast,
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    1.20 +software for all its users.  We, the Free Software Foundation, use the
    1.21 +GNU General Public License for most of our software; it applies also to
    1.22 +any other work released this way by its authors.  You can apply it to
    1.23 +your programs, too.
    1.24 +
    1.25 +  When we speak of free software, we are referring to freedom, not
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    1.37 +  For example, if you distribute copies of such a program, whether
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    1.43 +  Developers that use the GNU GPL protect your rights with two steps:
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    1.53 +  Some devices are designed to deny users access to install or run
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    1.73 +
    1.74 +                       TERMS AND CONDITIONS
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    1.76 +  0. Definitions.
    1.77 +
    1.78 +  "This License" refers to version 3 of the GNU General Public License.
    1.79 +
    1.80 +  "Copyright" also means copyright-like laws that apply to other kinds of
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    1.82 +
    1.83 +  "The Program" refers to any copyrightable work licensed under this
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    1.87 +  To "modify" a work means to copy from or adapt all or part of the work
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   1.159 +  All rights granted under this License are granted for the term of
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   1.182 +  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
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   1.184 +  No covered work shall be deemed part of an effective technological
   1.185 +measure under any applicable law fulfilling obligations under article
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   1.190 +  When you convey a covered work, you waive any legal power to forbid
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   1.220 +    b) The work must carry prominent notices stating that it is
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   1.225 +    c) You must license the entire work, as a whole, under this
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   1.233 +    d) If the work has interactive user interfaces, each must display
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   1.238 +  A compilation of a covered work with other separate and independent
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   1.242 +"aggregate" if the compilation and its resulting copyright are not
   1.243 +used to limit the access or legal rights of the compilation's users
   1.244 +beyond what the individual works permit.  Inclusion of a covered work
   1.245 +in an aggregate does not cause this License to apply to the other
   1.246 +parts of the aggregate.
   1.247 +
   1.248 +  6. Conveying Non-Source Forms.
   1.249 +
   1.250 +  You may convey a covered work in object code form under the terms
   1.251 +of sections 4 and 5, provided that you also convey the
   1.252 +machine-readable Corresponding Source under the terms of this License,
   1.253 +in one of these ways:
   1.254 +
   1.255 +    a) Convey the object code in, or embodied in, a physical product
   1.256 +    (including a physical distribution medium), accompanied by the
   1.257 +    Corresponding Source fixed on a durable physical medium
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   1.259 +
   1.260 +    b) Convey the object code in, or embodied in, a physical product
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   1.263 +    long as you offer spare parts or customer support for that product
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   1.265 +    copy of the Corresponding Source for all the software in the
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   1.272 +    c) Convey individual copies of the object code with a copy of the
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   1.277 +
   1.278 +    d) Convey the object code by offering access from a designated
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   1.291 +    e) Convey the object code using peer-to-peer transmission, provided
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   1.296 +  A separable portion of the object code, whose source code is excluded
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   1.300 +  A "User Product" is either (1) a "consumer product", which means any
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   1.313 +  "Installation Information" for a User Product means any methods,
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   1.321 +  If you convey an object code work under this section in, or with, or
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   1.332 +  The requirement to provide Installation Information does not include a
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   1.340 +  Corresponding Source conveyed, and Installation Information provided,
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   1.345 +
   1.346 +  7. Additional Terms.
   1.347 +
   1.348 +  "Additional permissions" are terms that supplement the terms of this
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   1.350 +Additional permissions that are applicable to the entire Program shall
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   1.353 +apply only to part of the Program, that part may be used separately
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   1.357 +  When you convey a copy of a covered work, you may at your option
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   1.364 +  Notwithstanding any other provision of this License, for material you
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   1.368 +    a) Disclaiming warranty or limiting liability differently from the
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   1.370 +
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   1.406 +  Additional terms, permissive or non-permissive, may be stated in the
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   1.408 +the above requirements apply either way.
   1.409 +
   1.410 +  8. Termination.
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   1.412 +  You may not propagate or modify a covered work except as expressly
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   1.418 +  However, if you cease all violation of this License, then your
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   1.425 +  Moreover, your license from a particular copyright holder is
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   1.432 +  Termination of your rights under this section does not terminate the
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   1.437 +
   1.438 +  9. Acceptance Not Required for Having Copies.
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   1.440 +  You are not required to accept this License in order to receive or
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   1.451 +  Each time you convey a covered work, the recipient automatically
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   1.456 +  An "entity transaction" is a transaction transferring control of an
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   1.469 +rights granted under this License, and you may not initiate litigation
   1.470 +(including a cross-claim or counterclaim in a lawsuit) alleging that
   1.471 +any patent claim is infringed by making, using, selling, offering for
   1.472 +sale, or importing the Program or any portion of it.
   1.473 +
   1.474 +  11. Patents.
   1.475 +
   1.476 +  A "contributor" is a copyright holder who authorizes use under this
   1.477 +License of the Program or a work on which the Program is based.  The
   1.478 +work thus licensed is called the contributor's "contributor version".
   1.479 +
   1.480 +  A contributor's "essential patent claims" are all patent claims
   1.481 +owned or controlled by the contributor, whether already acquired or
   1.482 +hereafter acquired, that would be infringed by some manner, permitted
   1.483 +by this License, of making, using, or selling its contributor version,
   1.484 +but do not include claims that would be infringed only as a
   1.485 +consequence of further modification of the contributor version.  For
   1.486 +purposes of this definition, "control" includes the right to grant
   1.487 +patent sublicenses in a manner consistent with the requirements of
   1.488 +this License.
   1.489 +
   1.490 +  Each contributor grants you a non-exclusive, worldwide, royalty-free
   1.491 +patent license under the contributor's essential patent claims, to
   1.492 +make, use, sell, offer for sale, import and otherwise run, modify and
   1.493 +propagate the contents of its contributor version.
   1.494 +
   1.495 +  In the following three paragraphs, a "patent license" is any express
   1.496 +agreement or commitment, however denominated, not to enforce a patent
   1.497 +(such as an express permission to practice a patent or covenant not to
   1.498 +sue for patent infringement).  To "grant" such a patent license to a
   1.499 +party means to make such an agreement or commitment not to enforce a
   1.500 +patent against the party.
   1.501 +
   1.502 +  If you convey a covered work, knowingly relying on a patent license,
   1.503 +and the Corresponding Source of the work is not available for anyone
   1.504 +to copy, free of charge and under the terms of this License, through a
   1.505 +publicly available network server or other readily accessible means,
   1.506 +then you must either (1) cause the Corresponding Source to be so
   1.507 +available, or (2) arrange to deprive yourself of the benefit of the
   1.508 +patent license for this particular work, or (3) arrange, in a manner
   1.509 +consistent with the requirements of this License, to extend the patent
   1.510 +license to downstream recipients.  "Knowingly relying" means you have
   1.511 +actual knowledge that, but for the patent license, your conveying the
   1.512 +covered work in a country, or your recipient's use of the covered work
   1.513 +in a country, would infringe one or more identifiable patents in that
   1.514 +country that you have reason to believe are valid.
   1.515 +
   1.516 +  If, pursuant to or in connection with a single transaction or
   1.517 +arrangement, you convey, or propagate by procuring conveyance of, a
   1.518 +covered work, and grant a patent license to some of the parties
   1.519 +receiving the covered work authorizing them to use, propagate, modify
   1.520 +or convey a specific copy of the covered work, then the patent license
   1.521 +you grant is automatically extended to all recipients of the covered
   1.522 +work and works based on it.
   1.523 +
   1.524 +  A patent license is "discriminatory" if it does not include within
   1.525 +the scope of its coverage, prohibits the exercise of, or is
   1.526 +conditioned on the non-exercise of one or more of the rights that are
   1.527 +specifically granted under this License.  You may not convey a covered
   1.528 +work if you are a party to an arrangement with a third party that is
   1.529 +in the business of distributing software, under which you make payment
   1.530 +to the third party based on the extent of your activity of conveying
   1.531 +the work, and under which the third party grants, to any of the
   1.532 +parties who would receive the covered work from you, a discriminatory
   1.533 +patent license (a) in connection with copies of the covered work
   1.534 +conveyed by you (or copies made from those copies), or (b) primarily
   1.535 +for and in connection with specific products or compilations that
   1.536 +contain the covered work, unless you entered into that arrangement,
   1.537 +or that patent license was granted, prior to 28 March 2007.
   1.538 +
   1.539 +  Nothing in this License shall be construed as excluding or limiting
   1.540 +any implied license or other defenses to infringement that may
   1.541 +otherwise be available to you under applicable patent law.
   1.542 +
   1.543 +  12. No Surrender of Others' Freedom.
   1.544 +
   1.545 +  If conditions are imposed on you (whether by court order, agreement or
   1.546 +otherwise) that contradict the conditions of this License, they do not
   1.547 +excuse you from the conditions of this License.  If you cannot convey a
   1.548 +covered work so as to satisfy simultaneously your obligations under this
   1.549 +License and any other pertinent obligations, then as a consequence you may
   1.550 +not convey it at all.  For example, if you agree to terms that obligate you
   1.551 +to collect a royalty for further conveying from those to whom you convey
   1.552 +the Program, the only way you could satisfy both those terms and this
   1.553 +License would be to refrain entirely from conveying the Program.
   1.554 +
   1.555 +  13. Use with the GNU Affero General Public License.
   1.556 +
   1.557 +  Notwithstanding any other provision of this License, you have
   1.558 +permission to link or combine any covered work with a work licensed
   1.559 +under version 3 of the GNU Affero General Public License into a single
   1.560 +combined work, and to convey the resulting work.  The terms of this
   1.561 +License will continue to apply to the part which is the covered work,
   1.562 +but the special requirements of the GNU Affero General Public License,
   1.563 +section 13, concerning interaction through a network will apply to the
   1.564 +combination as such.
   1.565 +
   1.566 +  14. Revised Versions of this License.
   1.567 +
   1.568 +  The Free Software Foundation may publish revised and/or new versions of
   1.569 +the GNU General Public License from time to time.  Such new versions will
   1.570 +be similar in spirit to the present version, but may differ in detail to
   1.571 +address new problems or concerns.
   1.572 +
   1.573 +  Each version is given a distinguishing version number.  If the
   1.574 +Program specifies that a certain numbered version of the GNU General
   1.575 +Public License "or any later version" applies to it, you have the
   1.576 +option of following the terms and conditions either of that numbered
   1.577 +version or of any later version published by the Free Software
   1.578 +Foundation.  If the Program does not specify a version number of the
   1.579 +GNU General Public License, you may choose any version ever published
   1.580 +by the Free Software Foundation.
   1.581 +
   1.582 +  If the Program specifies that a proxy can decide which future
   1.583 +versions of the GNU General Public License can be used, that proxy's
   1.584 +public statement of acceptance of a version permanently authorizes you
   1.585 +to choose that version for the Program.
   1.586 +
   1.587 +  Later license versions may give you additional or different
   1.588 +permissions.  However, no additional obligations are imposed on any
   1.589 +author or copyright holder as a result of your choosing to follow a
   1.590 +later version.
   1.591 +
   1.592 +  15. Disclaimer of Warranty.
   1.593 +
   1.594 +  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
   1.595 +APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
   1.596 +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
   1.597 +OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
   1.598 +THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   1.599 +PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
   1.600 +IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
   1.601 +ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
   1.602 +
   1.603 +  16. Limitation of Liability.
   1.604 +
   1.605 +  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
   1.606 +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
   1.607 +THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
   1.608 +GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
   1.609 +USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
   1.610 +DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
   1.611 +PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
   1.612 +EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
   1.613 +SUCH DAMAGES.
   1.614 +
   1.615 +  17. Interpretation of Sections 15 and 16.
   1.616 +
   1.617 +  If the disclaimer of warranty and limitation of liability provided
   1.618 +above cannot be given local legal effect according to their terms,
   1.619 +reviewing courts shall apply local law that most closely approximates
   1.620 +an absolute waiver of all civil liability in connection with the
   1.621 +Program, unless a warranty or assumption of liability accompanies a
   1.622 +copy of the Program in return for a fee.
   1.623 +
   1.624 +                     END OF TERMS AND CONDITIONS
   1.625 +
   1.626 +            How to Apply These Terms to Your New Programs
   1.627 +
   1.628 +  If you develop a new program, and you want it to be of the greatest
   1.629 +possible use to the public, the best way to achieve this is to make it
   1.630 +free software which everyone can redistribute and change under these terms.
   1.631 +
   1.632 +  To do so, attach the following notices to the program.  It is safest
   1.633 +to attach them to the start of each source file to most effectively
   1.634 +state the exclusion of warranty; and each file should have at least
   1.635 +the "copyright" line and a pointer to where the full notice is found.
   1.636 +
   1.637 +    <one line to give the program's name and a brief idea of what it does.>
   1.638 +    Copyright (C) <year>  <name of author>
   1.639 +
   1.640 +    This program is free software: you can redistribute it and/or modify
   1.641 +    it under the terms of the GNU General Public License as published by
   1.642 +    the Free Software Foundation, either version 3 of the License, or
   1.643 +    (at your option) any later version.
   1.644 +
   1.645 +    This program is distributed in the hope that it will be useful,
   1.646 +    but WITHOUT ANY WARRANTY; without even the implied warranty of
   1.647 +    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   1.648 +    GNU General Public License for more details.
   1.649 +
   1.650 +    You should have received a copy of the GNU General Public License
   1.651 +    along with this program.  If not, see <http://www.gnu.org/licenses/>.
   1.652 +
   1.653 +Also add information on how to contact you by electronic and paper mail.
   1.654 +
   1.655 +  If the program does terminal interaction, make it output a short
   1.656 +notice like this when it starts in an interactive mode:
   1.657 +
   1.658 +    <program>  Copyright (C) <year>  <name of author>
   1.659 +    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
   1.660 +    This is free software, and you are welcome to redistribute it
   1.661 +    under certain conditions; type `show c' for details.
   1.662 +
   1.663 +The hypothetical commands `show w' and `show c' should show the appropriate
   1.664 +parts of the General Public License.  Of course, your program's commands
   1.665 +might be different; for a GUI interface, you would use an "about box".
   1.666 +
   1.667 +  You should also get your employer (if you work as a programmer) or school,
   1.668 +if any, to sign a "copyright disclaimer" for the program, if necessary.
   1.669 +For more information on this, and how to apply and follow the GNU GPL, see
   1.670 +<http://www.gnu.org/licenses/>.
   1.671 +
   1.672 +  The GNU General Public License does not permit incorporating your program
   1.673 +into proprietary programs.  If your program is a subroutine library, you
   1.674 +may consider it more useful to permit linking proprietary applications with
   1.675 +the library.  If this is what you want to do, use the GNU Lesser General
   1.676 +Public License instead of this License.  But first, please read
   1.677 +<http://www.gnu.org/philosophy/why-not-lgpl.html>.

     2.1 --- a/Makefile	Wed Dec 01 22:02:42 2010 +0200
     2.2 +++ b/Makefile	Thu Dec 02 08:45:41 2010 +0200
     2.3 @@ -15,10 +15,10 @@
     2.4  bin = kernel.elf
     2.5  
     2.6  # default target: make an ELF binary by linking the object files
     2.7 -# we need to specify where to assume the text segment (code) is going
     2.8 -# in memory, as well as the kernel entry point (kstart).
     2.9 +# we need to specify where to assume the text section (code) is going
    2.10 +# in memory, as well as the kernel entry point (kentry).
    2.11  $(bin): $(obj)
    2.12 -	ld -melf_i386 -o $@ -Ttext 0x200000 -e _start $(obj)
    2.13 +	ld -melf_i386 -o $@ -Ttext 0x200000 -e kentry $(obj)
    2.14  
    2.15  .PHONY: clean
    2.16  clean:

     3.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     3.2 +++ b/README	Thu Dec 02 08:45:41 2010 +0200
     3.3 @@ -0,0 +1,3 @@
     3.4 +Code for article 1
     3.5 +Author: John Tsiombikas <nuclear@member.fsf.org>
     3.6 +License: GNU GPL v3 (or later).

     4.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     4.2 +++ b/run	Thu Dec 02 08:45:41 2010 +0200
     4.3 @@ -0,0 +1,3 @@
     4.4 +#!/bin/sh
     4.5 +
     4.6 +qemu -kernel kernel.elf

     5.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     5.2 +++ b/src/asmops.h	Thu Dec 02 08:45:41 2010 +0200
     5.3 @@ -0,0 +1,31 @@
     5.4 +#ifndef ASMOPS_H_
     5.5 +#define ASMOPS_H_
     5.6 +
     5.7 +#define inb(dest, port) asm volatile( \
     5.8 +	"inb %1, %0\n\t" \
     5.9 +	: "=a" (unsigned char)(dest) \
    5.10 +	: "dN" (unsigned short)(port))
    5.11 +
    5.12 +#define ins(dest, port) asm volatile( \
    5.13 +	"ins %1, %0\n\t" \
    5.14 +	: "=a" (unsigned short)(dest) \
    5.15 +	: "dN" (unsigned short)(port))
    5.16 +
    5.17 +#define inl(dest, port) asm volatile( \
    5.18 +	"inl %1, %0\n\t" \
    5.19 +	: "=a" (unsigned long)(dest) \
    5.20 +	: "dN" (unsigned short)(port))
    5.21 +
    5.22 +#define outb(src, port) asm volatile( \
    5.23 +	"outb %0, %1\n\t" \
    5.24 +	:: "a" (unsigned char)(src), "dN" (unsigned short)(port))
    5.25 +
    5.26 +#define outs(src, port) asm volatile( \
    5.27 +	"outs %0, %1\n\t" \
    5.28 +	:: "a" (unsigned short)(src), "dN" (unsigned short)(port))
    5.29 +
    5.30 +#define outl(src, port) asm volatile( \
    5.31 +	"outl %0, %1\n\t" \
    5.32 +	:: "a" (unsigned long)(src), "dN" (unsigned short)(port))
    5.33 +
    5.34 +#endif	/* ASMOPS_H_ */

     6.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     6.2 +++ b/src/klibc/stdio.c	Thu Dec 02 08:45:41 2010 +0200
     6.3 @@ -0,0 +1,11 @@
     6.4 +#include <stdio.h>
     6.5 +
     6.6 +/* putchar is defined in term.c */
     6.7 +
     6.8 +int puts(const char *s)
     6.9 +{
    6.10 +	while(*s) {
    6.11 +		putchar(*s++);
    6.12 +	}
    6.13 +	return 0;
    6.14 +}

     7.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     7.2 +++ b/src/klibc/stdio.h	Thu Dec 02 08:45:41 2010 +0200
     7.3 @@ -0,0 +1,7 @@
     7.4 +#ifndef STDIO_H_
     7.5 +#define STDIO_H_
     7.6 +
     7.7 +int putchar(int c);
     7.8 +int puts(const char *s);
     7.9 +
    7.10 +#endif	/* STDIO_H_ */

     8.1 --- a/src/klibc/string.c	Wed Dec 01 22:02:42 2010 +0200
     8.2 +++ b/src/klibc/string.c	Thu Dec 02 08:45:41 2010 +0200
     8.3 @@ -1,11 +1,45 @@
     8.4  #include <string.h>
     8.5  
     8.6 -void memset(void *s, int c, size_t sz)
     8.7 +void memset(void *s, int c, size_t n)
     8.8  {
     8.9 -	int i;
    8.10  	char *ptr = s;
    8.11 -
    8.12 -	for(i=0; i<sz; i++) {
    8.13 +	while(n--) {
    8.14  		*ptr++ = c;
    8.15  	}
    8.16  }
    8.17 +
    8.18 +void *memcpy(void *dest, const void *src, size_t n)
    8.19 +{
    8.20 +	char *dptr = dest;
    8.21 +	const char *sptr = src;
    8.22 +
    8.23 +	while(n--) {
    8.24 +		*dptr++ = *sptr++;
    8.25 +	}
    8.26 +	return dest;
    8.27 +}
    8.28 +
    8.29 +void *memmove(void *dest, const void *src, size_t n)
    8.30 +{
    8.31 +	int i;
    8.32 +	char *dptr;
    8.33 +	const char *sptr;
    8.34 +
    8.35 +	if(dest <= src) {
    8.36 +		/* forward copy */
    8.37 +		dptr = dest;
    8.38 +		sptr = src;
    8.39 +		for(i=0; i<n; i++) {
    8.40 +			*dptr++ = *sptr++;
    8.41 +		}
    8.42 +	} else {
    8.43 +		/* backwards copy */
    8.44 +		dptr = dest + n - 1;
    8.45 +		sptr = src + n - 1;
    8.46 +		for(i=0; i<n; i++) {
    8.47 +			*dptr-- = *sptr--;
    8.48 +		}
    8.49 +	}
    8.50 +
    8.51 +	return dest;
    8.52 +}

     9.1 --- a/src/klibc/string.h	Wed Dec 01 22:02:42 2010 +0200
     9.2 +++ b/src/klibc/string.h	Thu Dec 02 08:45:41 2010 +0200
     9.3 @@ -3,6 +3,8 @@
     9.4  
     9.5  #include <stdlib.h>
     9.6  
     9.7 -void memset(void *s, int c, size_t sz);
     9.8 +void memset(void *s, int c, size_t n);
     9.9 +void *memcpy(void *dest, const void *src, size_t n);
    9.10 +void *memmove(void *dest, const void *src, size_t n);
    9.11  
    9.12  #endif	/* STRING_H_ */

    10.1 --- a/src/main.c	Wed Dec 01 22:02:42 2010 +0200
    10.2 +++ b/src/main.c	Thu Dec 02 08:45:41 2010 +0200
    10.3 @@ -1,10 +1,10 @@
    10.4 -/*#include <stdio.h>*/
    10.5 +#include <stdio.h>
    10.6  #include "vid.h"
    10.7 +#include "term.h"
    10.8  
    10.9  void kmain(void)
   10.10  {
   10.11 -	clear_scr();
   10.12 -	put_char('a', 0, 0, 4, 0);
   10.13 -	put_char('b', 40, 12, 1, 7);
   10.14 -	/*printf("Hello world from kernel space\n");*/
   10.15 +	clear_scr(0);
   10.16 +	set_text_color(LTRED);
   10.17 +	puts("hello world!");
   10.18  }

    11.1 --- a/src/mboot.S	Wed Dec 01 22:02:42 2010 +0200
    11.2 +++ b/src/mboot.S	Thu Dec 02 08:45:41 2010 +0200
    11.3 @@ -3,19 +3,15 @@
    11.4  #define STACK_SIZE	0x4000
    11.5  
    11.6  	.text
    11.7 -	.globl _start
    11.8 -_start:
    11.9 -	/* jump over the multiboot header onto the startup code */
   11.10 -	jmp kentry
   11.11 -
   11.12  	.align 4
   11.13 +	
   11.14  	/* multiboot header */
   11.15 -mboot_hdr:
   11.16  	.long MAGIC
   11.17  	.long FLAGS
   11.18  	.long -(MAGIC + FLAGS)	/* checksum */
   11.19  	.fill 5, 4	/* fill out the rest with zeroes */
   11.20  
   11.21 +	.globl kentry
   11.22  kentry:
   11.23  	/* setup a temporary kernel stack */
   11.24  	movl $(stack + STACK_SIZE), %esp

    12.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
    12.2 +++ b/src/term.c	Thu Dec 02 08:45:41 2010 +0200
    12.3 @@ -0,0 +1,53 @@
    12.4 +#include "term.h"
    12.5 +#include "vid.h"
    12.6 +
    12.7 +static int bg, fg = 15;
    12.8 +static int cursor_x, cursor_y;
    12.9 +
   12.10 +void set_text_color(int c)
   12.11 +{
   12.12 +	if(c >= 0 && c < 16) {
   12.13 +		fg = c;
   12.14 +	}
   12.15 +}
   12.16 +
   12.17 +void set_back_color(int c)
   12.18 +{
   12.19 +	if(c >= 0 && c < 16) {
   12.20 +		bg = c;
   12.21 +	}
   12.22 +}
   12.23 +
   12.24 +int putchar(int c)
   12.25 +{
   12.26 +	switch(c) {
   12.27 +	case '\n':
   12.28 +		cursor_y++;
   12.29 +
   12.30 +	case '\r':
   12.31 +		cursor_x = 0;
   12.32 +		break;
   12.33 +
   12.34 +	case '\b':
   12.35 +		cursor_x--;
   12.36 +		set_char(' ', cursor_x, cursor_y, fg, bg);
   12.37 +		break;
   12.38 +
   12.39 +	case '\t':
   12.40 +		cursor_x = ((cursor_x >> 3) + 1) << 3;
   12.41 +		break;
   12.42 +
   12.43 +	default:
   12.44 +		set_char(c, cursor_x, cursor_y, fg, bg);
   12.45 +		if(++cursor_x >= WIDTH) {
   12.46 +			cursor_x = 0;
   12.47 +			cursor_y++;
   12.48 +		}
   12.49 +	}
   12.50 +
   12.51 +	if(cursor_y >= HEIGHT) {
   12.52 +		scroll_scr();
   12.53 +		cursor_y--;
   12.54 +	}
   12.55 +	return c;
   12.56 +}

    13.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
    13.2 +++ b/src/term.h	Thu Dec 02 08:45:41 2010 +0200
    13.3 @@ -0,0 +1,9 @@
    13.4 +#ifndef TERM_H_
    13.5 +#define TERM_H_
    13.6 +
    13.7 +void set_text_color(int c);
    13.8 +void set_back_color(int c);
    13.9 +
   13.10 +int putchar(int c);
   13.11 +
   13.12 +#endif	/* TERM_H_ */

    14.1 --- a/src/vid.c	Wed Dec 01 22:02:42 2010 +0200
    14.2 +++ b/src/vid.c	Thu Dec 02 08:45:41 2010 +0200
    14.3 @@ -1,26 +1,24 @@
    14.4  #include <string.h>
    14.5  #include "vid.h"
    14.6  
    14.7 -#define WIDTH	80
    14.8 -#define HEIGHT	25
    14.9  static uint16_t *vmem = (uint16_t*)0xb8000;
   14.10  
   14.11 -void clear_scr(void)
   14.12 +void clear_scr(int color)
   14.13  {
   14.14  	memset(vmem, 0, WIDTH * HEIGHT * 2);
   14.15  }
   14.16  
   14.17 -void set_cursor(int x, int y)
   14.18 +void set_char(char c, int x, int y, int fg, int bg)
   14.19  {
   14.20 -	if(x < 0 || x >= WIDTH || y < 0 || y >= HEIGHT) {
   14.21 -		/* disable cursor */
   14.22 -		return;
   14.23 -	}
   14.24 -	/* set cursor position */
   14.25 +	uint16_t attr = (fg & 0xf) | ((bg & 7) << 4);
   14.26 +	vmem[y * WIDTH + x] = (uint16_t)c | (attr << 8);
   14.27  }
   14.28  
   14.29 -void put_char(char c, int x, int y, int fg, int bg)
   14.30 +void scroll_scr(void)
   14.31  {
   14.32 -	uint16_t attr = (fg & 0xf) | ((bg & 7) << 4);
   14.33 -	vmem[y * 80 + x] = (uint16_t)c | (attr << 8);
   14.34 +	/* copy the second up to last text line, one line back, then
   14.35 +	 * clear the last line.
   14.36 +	 */
   14.37 +	memmove(vmem, vmem + WIDTH, WIDTH * (HEIGHT - 1) * 2);
   14.38 +	memset(vmem + WIDTH * (HEIGHT -1), 0, WIDTH * 2);
   14.39  }

    15.1 --- a/src/vid.h	Wed Dec 01 22:02:42 2010 +0200
    15.2 +++ b/src/vid.h	Thu Dec 02 08:45:41 2010 +0200
    15.3 @@ -1,8 +1,30 @@
    15.4  #ifndef VID_H_
    15.5  #define VID_H_
    15.6  
    15.7 -void clear_scr(void);
    15.8 -void set_cursor(int x, int y);
    15.9 -void put_char(char c, int x, int y, int fg, int bg);
   15.10 +#define WIDTH	80
   15.11 +#define HEIGHT	25
   15.12 +
   15.13 +enum {
   15.14 +	BLACK,
   15.15 +	BLUE,
   15.16 +	GREEN,
   15.17 +	CYAN,
   15.18 +	RED,
   15.19 +	MAGENTA,
   15.20 +	BROWN,
   15.21 +	LTGRAY,
   15.22 +	GRAY,
   15.23 +	LTBLUE,
   15.24 +	LTGREEN,
   15.25 +	LTCYAN,
   15.26 +	LTRED,
   15.27 +	LTMAGENTA,
   15.28 +	YELLOW,
   15.29 +	WHITE
   15.30 +};
   15.31 +
   15.32 +void clear_scr(int color);
   15.33 +void set_char(char c, int x, int y, int fg, int bg);
   15.34 +void scroll_scr(void);
   15.35  
   15.36  #endif	/* VID_H_ */