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An operating system with everything built custom.
36 commits 2 branches 0 tags 827 KiB
Makefile 44%
C 40.8%
C++ 7.7%
Cuda 3.9%
Assembly 2.1%
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Felix Queissner c21e7e7f30 Merge branch 'master' of github.com:MasterQ32/trainOS
2015-08-19 15:07:59 +02:00
asm Adds dynamic.h and dynamic.S creating a dynamic call utility. 2015-08-14 23:53:51 +02:00
include Fixes a lot of memory leaks. Adds malloc monitoring. 2015-08-17 20:04:14 +02:00
scripts Adds improved malloc hash/magic security. Now checks all malloc::List entries for validity. 2015-08-19 15:07:25 +02:00
src Adds improved malloc hash/magic security. Now checks all malloc::List entries for validity. 2015-08-19 15:07:25 +02:00
trainscript Fixes a lot of memory leaks. Adds malloc monitoring. 2015-08-17 20:04:14 +02:00
.gitignore Adds native code invoke unit. 2015-08-14 11:58:16 +02:00
Depfile Fixes a lot of memory leaks. Adds malloc monitoring. 2015-08-17 20:04:14 +02:00
kernel.ld somehow c++ support and stuff. 2015-08-13 17:23:11 +02:00
LICENSE initial release. 2015-08-09 02:42:56 +02:00
Makefile Fixes a lot of memory leaks. Adds malloc monitoring. 2015-08-17 20:04:14 +02:00
README.md Merge branch 'master' of github.com:MasterQ32/trainOS 2015-08-19 15:07:59 +02:00
trainOS.pro Fixes a lot of memory leaks. Adds malloc monitoring. 2015-08-17 20:04:14 +02:00
trainscript.md initial release. 2015-08-09 02:42:56 +02:00

README.md

trainOS

Description

An operating system built around the language "trainscript" which is used to execute all user code in a virtual machine.

Current status:

The vm can execute some code and is able to call native code. Also it leaks memory. A lot of memory.

Todo List

  • Fixing Memory Leaks
  • Adding support for Modules
  • Adding support for Pointer Types
  • Adding support for String Type

Guidlines

  • Calls to die or die_extra should follow the following scheme: ContextName.ErrorName

Kernel Architecture

The kernel is a simple kernel that does not utilize paging. It has simple interrupt management where an interrupt handler can be registerd for each interrupt.

Bootstrapping

  1. Setup 16 kB stack space
  2. Clear screen and print boot message
  3. Initialize physical memory management (page allocator)
  4. Initialize interrupts
  5. Enable hardware interrupts
  6. Initialize timer
  7. Initialize C++ support
  8. Register status bar timer callback
  9. Start virtual machine (and run OS)
  10. Disable hardware interrupts
  11. Print stop message

Memory Allocation

The kernel features a simple malloc structure that allocates memor between 0x400000 and 0x800000 (4 MB heap space).

The allocator can be configured to "secure" its allocation list with a magic number by defining USE_MAGIC_SECURED_MALLOC in config.h.

It also features a surveillance mode that logs all allocations / frees. It can be enabled by defining USE_VERBOSE_MALLOC and USE_VERBOSE_FREE in config.h.

Interrupt Mapping

Number Interrupt
0x00 - 0x1F System Interrupts
0x20 - 0x27 IRQ0 - IRQ7
0x28 - 0x2F IRQ8 - IRQ15

OS Architecture

To be done.