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22 commits

Author SHA1 Message Date
Andreas Kling
702d308e67 Oops, StringImpl's "the empty string" global was not always initialized. 
These "oops forgot to initialize" bugs are getting annoying...
 2018-10-22 13:10:08 +02:00
Andreas Kling
a9ca75c98b Add IRQHandler class that can be subclasses to handle an IRQ. 
Also move Keyboard to a class implementation using this pattern.
 2018-10-22 12:58:29 +02:00
Andreas Kling
e4afa2a041 Tweak _test.o to use the putch() syscall. 
It's still running in kernel space. Once I make it possible for ELFLoader
to set up a ring 3 task, we'll really be cooking!
 2018-10-22 11:53:59 +02:00
Andreas Kling
3a3c57357c Add a sys$exit and make init_stage2 call it when finished. 2018-10-22 11:43:55 +02:00
Andreas Kling
79ffdb7205 A lot of hacking: 
- More work on funneling console output through Console.
- init() now breaks off into a separate task ASAP.
- ..this leaves the "colonel" task as a simple hlt idle loop.
- Mask all IRQs on startup (except IRQ2 for slave passthru)
- Fix underallocation bug in Task::allocateRegion().
- Remember how many times each Task has been scheduled.

The panel and scheduling banner are disabled until I get things
working nicely in the (brave) new Console world.
 2018-10-22 11:15:16 +02:00
Andreas Kling
fc88368582 Have Console::write() directly call vga_putch. 2018-10-21 22:44:26 +02:00
Andreas Kling
a70bfb87d5 Add a Console device and start refactoring screen output. 2018-10-21 21:59:43 +02:00
Andreas Kling
46ff281695 Turn the syscall interrupt into a trap (by switching the gate type.) 
This leaves interrupts enabled while we're in the kernel, which is
precisely what we want.

This uncovered a horrendous problem with kernel tasks silently
overflowing their stacks. For now I've simply increased the stack size
but I need a more MMU-y solution for this eventually.
 2018-10-19 11:31:18 +02:00
Andreas Kling
97e0d75bcb ELFLoader works inside the kernel! 
We load /_hello.o which just prints out a simple message.
It executes inside the kernel itself, so no fancy userspace process
or anything, but this is still so cool!
 2018-10-18 15:46:08 +02:00
Andreas Kling
3649638259 Add Regions concept to Task. 2018-10-18 14:55:20 +02:00
Andreas Kling
f67d695254 More paging stuff. 
The test userspace process now runs at linear address 0x300000 which is
mapped to a dynamically allocated page from the MemoryManager. Cool!
 2018-10-18 13:05:00 +02:00
Andreas Kling
89851a9ded Use FileHandle from VFS. 2018-10-18 10:28:09 +02:00
Andreas Kling
56c1f9db8e A userspace process can now GPF and the OS goes on! 
This is really rickety, but it kinda sorta works for my test GPF!
 2018-10-17 23:49:32 +02:00
Andreas Kling
77299cf54d Add basic paging. Only identity maps the bottom 4MB as a start. 2018-10-17 23:13:55 +02:00
Andreas Kling
39fa1eb2c2 Print the contents of motd.txt on boot. 2018-10-17 12:07:39 +02:00
Andreas Kling
705832f387 List the root directory after mounting /. 
So cool that it works! It's spewing out a bunch of terminal escape sequences
that the OS console obviously doesn't support, but we'll get there too.
 2018-10-17 11:47:14 +02:00
Andreas Kling
b05ed591ab VFS mounts an ext2fs root! :^) 2018-10-17 11:44:06 +02:00
Andreas Kling
9171521752 Integrate ext2 from VFS into Kernel. 2018-10-17 10:57:23 +02:00
Andreas Kling
aec8ab0a60 Add the basic character devices to kernel. 2018-10-16 14:33:16 +02:00
Andreas Kling
12e515735b Add a simple IDEDiskDevice class that implements DiskDevice from VFS. 2018-10-16 14:17:43 +02:00
Andreas Kling
72bb80a9ae These changes were lying around uncommitted in the old repo. 
I'm just gonna commit them without too much thinking and then take
it from there.
 2018-10-16 11:06:35 +02:00
Andreas Kling
9396108034 Import the "gerbert" kernel I worked on earlier this year. 
It's a lot crappier than I remembered it. It's gonna need a lot of work.
 2018-10-16 11:02:00 +02:00