jdetter/chronos

The Chronos kernel

chronos's Issues

Move public wiki pages to github.

Feel free to close if they should still be hosted on chronos.systems or this isn't worth the effort.

GRUB2 support

Support for chainloading through GRUB2 needs to be added.

Debugging output needs to be improved

The debugging system is really crufty right now and has a lot of room for improvement.

Add Functional Testing - With Continuous Integration

Incorportate a build configuration system.

To consider:

• SCons
• CMake
• kconfig (Would need to port from linux kernel or find an existing port)
• roll our own autotools build

I'll also update this first comment with any other suggestions to consider and leave discussion to comments.

Repeated mallocs/frees causing segfault

This test passes on Linux, however causes a segfault in Chronos. Reproducer program (malloc test in testsuite):

#include <stdlib.h>
#include <testsuite.h>

#define COUNT 0x10000
#define ALLOC_SIZE 0x1000

int main(int argc, char** argv)
{
    int* arr[COUNT];
    int x;
    for(x = 0;x < COUNT;x++)
    {
        arr[x] = malloc(ALLOC_SIZE);
        if(!arr[x])
            TESTFAILURE;
    }

    for(x = 0;x < COUNT;x++)
        free(arr[x]);

    for(x = 0;x < COUNT;x++)
    {
        arr[x] = malloc(ALLOC_SIZE);
        if(!arr[x])
            TESTFAILURE;
    }

    for(x = 0;x < COUNT;x++)
        free(arr[x]);

    TESTSUCCESS;

    return 0;
}

RAID 0 and 1 support

Add support for RAID levels 0 and 1.

Boot stage 2 memory map revisit

The boot stage 2 has changed significantly recently and has gotten much bigger and will grow much more very soon with the addition of root partition detection. The new boot stage 2 will start at physical address 0x6000 and go to physical address 0x20000, which makes it 88KB in size. I have moved around a lot of the kernel argument stuff (current video mode, start of page pool, ect.) because before we were writing over BIOS data.I have posted the new map as a gist:

https://gist.github.com/jdetter/ca388fce7828420c313f57535a720f13

A large amount of space has been left in the text section because we still haven't added support for root partition detection

Release Build Toolchain

• Needed for continuous integration support. #14

EXT2 driver won't work with block sizes other than 4K

Mounting a file system with a block size less than 4K causes the driver not to work properly. I don't think I've noticed a crash but all of the data is nonsense.

System also won't boot with an ext2 system with a non 4K block size.

Support for symbolic links

Kernel support needs to be added for global (accross file systems) symbol links.

Support for /etc/fstab and mounting partitions on boot

Right now, Chronos will search for the first EXT2 file system on the disk and use that as the root file system and then mount a memory based file system on /dev (creating /dev first if necessary). Support needs to be added for an fstab file so that different partitions can be mounted at different places in the file system. This will also be a precursor to adding support for booting with GRUB2.

Kernel support for setting errno value

Right now there is no support for the kernel setting the errno value. The errno value should be passed back to the user program in a general purpose register (probably ECX).

Testsuite tests will be provided.

Boot stage 1 ata readsect issue

The ata_readsect assembly function is not reading sector number above ~128.