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Author SHA1 Message Date
Andreas Kling
98f76f0153 Flush the TLB after modifying page tables. 
This is a very inefficient naive implementation, but it gets us going.
Mapping tasks in and out of a shared address space now totally works.
 2018-10-23 11:03:56 +02:00
Andreas Kling
fe237ee215 Lots of hacking: 
- Turn Keyboard into a CharacterDevice (85,1) at /dev/keyboard.
- Implement MM::unmapRegionsForTask() and MM::unmapRegion()
- Save SS correctly on interrupt.
- Add a simple Spawn syscall for launching another process.
- Move a bunch of IO syscall debug output behind DEBUG_IO.
- Have ASSERT do a "cli" immediately when failing.
  This makes the output look proper every time.
- Implement a bunch of syscalls in LibC.
- Add a simple shell ("sh"). All it can do now is read a line
  of text from /dev/keyboard and then try launching the specified
  executable by calling spawn().

There are definitely bugs in here, but we're moving on forward.
 2018-10-23 10:12:50 +02:00
Andreas Kling
b824f15619 Launching an arbitrary ELF executable from disk works! :^) 
This is so cool! It's a bit messy now with two Task constructors,
but eventually they should fold into a single constructor somehow.
 2018-10-22 15:43:02 +02:00
Andreas Kling
befeabd8fe Okay, with some mucking around, there is now a /bin/id and it runs! 
It statically links against everything in LibC that it needs.
This will work just fine for a long time to come!
 2018-10-22 14:41:54 +02:00
Andreas Kling
63764b3a65 Import very modest Userland. 2018-10-22 14:06:22 +02:00
Andreas Kling
85bcf2ed0f Add getgid() and getpid() syscalls. Prep for LibC. 2018-10-22 13:55:11 +02:00
Andreas Kling
bae59609e3 Move kprintf to its own file. It has nothing to do with VGA anymore. 2018-10-22 13:20:35 +02:00
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
c5e55f4737 Use UD2 instead of CLI;HLT for CRASH(). 
This way the kernel prints out a nice register dump so we can find
out where we crashed.
 2018-10-22 13:07:06 +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
8f941561b4 Add ALWAYS_INLINE macro. 2018-10-22 12:55:59 +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
09fc9c0698 Make Console::m_rows/m_columns const for now. 2018-10-21 23:48:50 +02:00
Andreas Kling
e38f40a83c Add an InlineLinkedList::containsSlow(T*) helper. 2018-10-21 23:48:27 +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
d5ec18027e Protect the first 4 KB of memory. 
This makes null pointers crashy, tremendously useful :^)
 2018-10-21 21:59:11 +02:00
Andreas Kling
dd6706a1a1 Fix null deref in contextSwitch(). 2018-10-21 21:57:43 +02:00
Andreas Kling
2f99ff801e Move post-boot kernel stack pointer to 0x4000. 2018-10-21 21:51:12 +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
6ab0649ad6 ksprintf() should null-terminate strings. 2018-10-18 15:24:07 +02:00
Andreas Kling
c149d2a8f0 Build ELFLoader into Kernel. 2018-10-18 15:03:10 +02:00
Andreas Kling
3649638259 Add Regions concept to Task. 2018-10-18 14:55:20 +02:00
Andreas Kling
5b10846bed Add a simple ELF binary called _test.o to the test fs. 2018-10-18 13:16:30 +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
9d5de91cf3 Actually destroy tasks after they crash. 2018-10-18 00:26:30 +02:00
Andreas Kling
1a801e5737 Hang if we GPF in ring 0. 2018-10-18 00:13:06 +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
286e27ef40 Allow running in QEMU with "./run q" 
The kernel doesn't run in QEMU right now and I don't know why.
 2018-10-17 16:58:35 +02:00
Andreas Kling
8ff394f83f Fix a dumb in buffer_putch. 2018-10-17 16:56:47 +02:00
Andreas Kling
9aa88fe186 Add a PIC::getISR() helper. 2018-10-17 16:54:49 +02:00
Andreas Kling
e0f31d38a2 Add -fno-pic -fno-pie to build flags. 2018-10-17 16:49:30 +02:00
Andreas Kling
f82b25d4f9 Fix some minor build warnings. 2018-10-17 16:48:43 +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
d2425495ca VirtualFileSystem class builds inside Kernel. 2018-10-17 11:40:58 +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
87d41bdca4 If an interrupt comes from the slave PIC, both PICs need an EOI. 2018-10-16 11:05:29 +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