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Author SHA1 Message Date
Andreas Kling
e6284a8774 Fix broken SpinLock. 
The SpinLock was all backwards and didn't actually work. Fixing it exposed
how wrong most of the locking here is.

I need to come up with a better granularity here.
 2018-10-29 22:04:26 +01:00
Andreas Kling
bea106fdb2 Fix up VFS::resolveSymbolicLink() to use a base inode instead of a base path. 
Also more VFS error plumbing.
 2018-10-28 14:25:51 +01:00
Andreas Kling
97726862dd Add basic symlink support. 
- sys$readlink + readlink()
- Add a /proc/PID/exe symlink to the process's executable.
- Print symlink contents in ls output.
- Some work on plumbing options into VFS::open().
 2018-10-28 14:11:51 +01:00
Andreas Kling
1d4af51250 Add a VFS::absolutePath(InodeIdentifier). 
This is pretty inefficient for ext2fs. We walk the entire block group
containing the inode, searching through every directory for an entry
referencing this inode.

It might be a good idea to cache this information somehow. I'm not sure
how often we'll be searching for it.

Obviously there are multiple caching layers missing in the file system.
 2018-10-28 12:20:25 +01:00
Andreas Kling
3f050c1972 Add zone dump to /proc/mm. 
Sweet, now we can look at all the zones (physical memory) currently in play.

Building the procfs files with ksprintf and rickety buffer presizing feels
pretty shoddy but I'll fix it up eventually.
 2018-10-28 10:39:27 +01:00
Andreas Kling
c76dc9a047 Add /proc/mm and a /bin/mm utility that just dumps it. 
This shows some info about the MM. Right now it's just the zone count
and the number of free physical pages. Lots more can be added.

Also added "exit" to sh so we can nest shells and exit from them.

I also noticed that we were leaking all the physical pages, so fixed that.
 2018-10-28 10:28:21 +01:00
Andreas Kling
0a6a2521e8 Add subregions to /proc/PID/vm 2018-10-28 10:03:54 +01:00
Andreas Kling
1d5afbdffc Add sys$set_mmap_name and use it from LibC's malloc. 
It's nice to be able to identify mmap's in /proc/PID/vm.
 2018-10-28 09:57:22 +01:00
Andreas Kling
e904f193c1 Canonicalize the path used by sh. 
With a bunch of LibC work to support the feature. LibC now initializes
AK::StringImpl by default. It's now fine to use AK in LibC/Userland! :^)
 2018-10-28 09:36:21 +01:00
Andreas Kling
88ad59bfb1 Add a simple FileSystemPath class that can canonicalize paths. 
Also a simple StringBuilder to help him out.
 2018-10-28 08:54:20 +01:00
Andreas Kling
43475f248b Add save/unsave cursor escape sequences. 
Also added a little terminal test program called /bin/tst.
 2018-10-28 01:44:53 +02:00
Andreas Kling
ea6221dd06 Stop committing changes to _fs_contents and generate it in the sync script. 2018-10-28 01:21:15 +02:00
Andreas Kling
e2dbdd14aa Colorize ls output. 2018-10-28 01:17:48 +02:00
Andreas Kling
52c19136f2 Give the shell a nice, colorful prompt. 
The cwd looks like crap, I need to write some code to strip out ".."
and extra slashes from the path string.
 2018-10-28 01:08:01 +02:00
Andreas Kling
dd3244137e Add basic support for ANSI color escape sequences. 2018-10-28 00:56:19 +02:00
Andreas Kling
8289a5c93c Implement 'H' and 'J' escape sequences. 2018-10-27 23:42:20 +02:00
Andreas Kling
cc7e3519a6 Add a /bin/clear that prints the clear terminal escape sequence. 
It doesn't work yet, but it will!
 2018-10-27 17:39:08 +02:00
Andreas Kling
8f91a47aeb Add some basic field width support to printf(). 
Use it to make "ls" output a bit better. Also sys$spawn now fails with EACCES
if the path is not a file that's executable by the current uid/gid.
 2018-10-27 16:43:03 +02:00
Andreas Kling
de2fb183cc Rename "kernel map" concept to just "ksyms" 2018-10-27 15:02:39 +02:00
Andreas Kling
9a71c7759a Implement loading of linked ELF executables. 
This took me a couple hours. :^)

The ELF loading code now allocates a single region for the entire
file and creates virtual memory mappings for the sections as needed.

Very nice!
 2018-10-27 14:56:52 +02:00
Andreas Kling
99ee6acd69 Enable A20 line at boot. 2018-10-27 14:09:33 +02:00
Andreas Kling
601d0d1739 Better int hashing. This was going to bite me sooner or later. 2018-10-27 09:33:24 +02:00
Andreas Kling
ec07761d0f Implement waitpid() support for getting the waitee's exit code. 2018-10-27 01:24:22 +02:00
Andreas Kling
5cfeeede7c Remove the obsolete "Userspace" stuff. 2018-10-27 00:41:23 +02:00
Andreas Kling
42c88b5f2d Turn off the floppy drive after the boot loader is finished. 2018-10-27 00:40:42 +02:00
Andreas Kling
3db8d7ae1a Use Unix::stat for sys$lstat(). 2018-10-27 00:29:31 +02:00
Andreas Kling
509e5f9952 Add some basic address validation to syscalls. 
This is extremely ineffcient, but it doesn't really matter yet.
 2018-10-27 00:29:24 +02:00
Andreas Kling
2716a9e2d7 Greatly improve /proc/PID/stack by tracing the ebp frame chain. 
I also added a generator cache to FileHandle. This way, multiple
reads to a generated file (i.e in a synthfs) can transparently
handle multiple calls to read() without the contents changing
between calls.

The cache is discarded at EOF (or when the FileHandle is destroyed.)
 2018-10-27 00:14:24 +02:00
Andreas Kling
c928b06218 Add a very hackish /proc/PID/stack. 
It walks the stack and identifies anything that looks like a kernel symbol.
This could be a lot more sophisticated.
 2018-10-26 22:33:15 +02:00
Andreas Kling
81627cf7d5 Add a simple /proc/mounts that enumerates the current VFS mounts. 2018-10-26 18:43:25 +02:00
Andreas Kling
a447359916 Add a /proc/kmalloc stats file. 2018-10-26 18:28:25 +02:00
Andreas Kling
edb81a635c Fix bug where you couldn't "cd .." into the root of a mounted fs. 2018-10-26 18:19:31 +02:00
Andreas Kling
a32b3a3ddf Implement /proc/PID/vm. 
Refactored SyntheticFileSystem to maintain an arbitrary directory structure.
ProcFileSystem creates a directory entry in /proc for each new process.
 2018-10-26 17:44:19 +02:00
Andreas Kling
10347b9ae8 Add ASSERT_INTERRUPTS_DISABLED in Task::fromPID(). 2018-10-26 15:11:29 +02:00
Andreas Kling
63e5583c18 Properly null-terminate the argv list created by sh. 2018-10-26 15:04:20 +02:00
Andreas Kling
1c45b28da6 Add sys$uname() and a /bin/uname utility. 2018-10-26 14:57:26 +02:00
Andreas Kling
384e2f24d4 Add per-task limit for open fd's. Hard-coded at 16 for now. 2018-10-26 14:30:38 +02:00
Andreas Kling
2749e7f1c2 Implement sys$chdir() and teach sh+ls to cd around and browse different dirs. 2018-10-26 14:24:11 +02:00
Andreas Kling
ac738b03d6 Add memcpy() and strcmp() to LibC. 2018-10-26 13:32:13 +02:00
Andreas Kling
0af9254812 If spawning a task fails after we did a partial ELF load, remap current. 
This is an annoying issue. It'd be nice if this code didn't have to worry
about preserving the calling task's mappings.
 2018-10-26 12:22:22 +02:00
Andreas Kling
546ddd7de0 Remove logspam in /dev/{full,null,zero} now that they work just fine. 
Also don't echo anything to console when putch'ing '\0'.
 2018-10-26 11:27:42 +02:00
Andreas Kling
6312c3f253 Fix mixup between /dev/null and /dev/zero device registration. 2018-10-26 11:25:46 +02:00
Andreas Kling
df87dda63c Implement argc/argv support for spawned tasks. 
Celebrate the new functionality with a simple /bin/cat implementation. :^)
 2018-10-26 11:16:56 +02:00
Andreas Kling
53abfa7ea1 Add sys$gethostname and /bin/hostname 2018-10-26 09:54:29 +02:00
Andreas Kling
3faaa3e04a Add /bin/false and /bin/true for fun. :^) 2018-10-25 21:39:37 +02:00
Andreas Kling
dc6f57f19c Add gettimeofday() syscall and LibC wrappers gettimeofday() and time(). 
This only has second accuracy right now, I'll work out subseconds later.
 2018-10-25 17:36:18 +02:00
Andreas Kling
5978185242 Add a "sleep" syscall that sleeps for N seconds. 2018-10-25 13:56:03 +02:00
Andreas Kling
c6f2890d8e Implement a basic way for read() to block. 
FileHandle gets a hasDataAvailableForRead() getter.
If this returns true in sys$read(), the task will block(BlockedRead) + yield.
The fd blocked on is stored in Task::m_fdBlockedOnRead.
The scheduler then looks at the state of that fd during the unblock phase.

This makes "sh" restful. :^)

There's still some problem with the kernel not surviving the colonel task
getting scheduled. I need to figure that out and fix it.
 2018-10-25 13:09:56 +02:00
Andreas Kling
ba56f4afde If no context switch occurs, add 1 to the timesScheduled() for current. 
This seems like more accurate accounting.
 2018-10-25 12:45:29 +02:00
Andreas Kling
571dc8234f Make the stage2 init task sleep dreamily when finished. 
Something is off about scheduling, I don't think the kernel is handing
out all the available time to processes that are available to run.
 2018-10-25 12:40:17 +02:00