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521 Commits

Author SHA1 Message Date
Bananymous 86df258365 Kernel: rework the whole PageTable structure 
We now have page table structure for kernel memory which is shared
between all processes.
 2023-07-05 23:41:35 +03:00
Bananymous 0d620f3e0f Kernel: Rewrite and optimize DiskCache 
DiskCache now consists of PageCaches which are caches of contiguous
sectors. This allows the disk cache to be ordered and faster traversal.

We seem to have a problem somewhere during reading. The stack gets
corrupted.
 2023-06-19 10:31:47 +03:00
Bananymous 5e123031aa Kernel: kmalloc has now somewhat dynamic storage 
Allocations bigger than PAGE_SIZE and those not forced to be identity
mapped are now done on a GeneralAllocator. This allows us to use kmalloc
for big allocations; bigger than the fixed 1 MiB storage.

This is still a hack and the whole kmalloc will have to be rewritten at
some point, but for now this does the job :D
 2023-06-18 23:27:00 +03:00
Bananymous 388f530edd Kernel: Add GeneralAllocator::paddr_of 
Yoy can now query physical address of a virtual address for general
allocator allocation
 2023-06-18 23:25:51 +03:00
Bananymous d354cccd37 Kernel: Add enum for ISR name to number 2023-06-18 23:24:27 +03:00
Bananymous 714305ef56 Kernel: General allocator takes first valid vaddr as parameter 2023-06-17 22:23:34 +03:00
Bananymous f83ae1e9c6 Kernel: Move print during boot 2023-06-12 23:45:36 +03:00
Bananymous 32e1473c94 Kernel: Make disk IO blocking thread safe 
This was causing a lot of deadlocks on vms without kvm accel
 2023-06-12 18:57:47 +03:00
Bananymous bf617036c7 Kernel: Rework syscall calling 
I removed the intermediate function when calling syscalls. Now syscall
handler calls the current process automatically. Only exception is
sys_fork, since it needs a assembly trampoline for the new thread.
 2023-06-12 14:16:48 +03:00
Bananymous ce55422a24 Kernel: Remove Shell from kernel 
This is now obsolete since we have a userspace Shell.
 2023-06-12 02:04:52 +03:00
Bananymous 0f63cfa43f Kernel/LibC: add SYS_{SET,GET}_PWD and chdir, getpwd 2023-06-12 02:02:52 +03:00
Bananymous 537780ee1e Kernel: allocate thread stacks from 0x300000 onwards 
I had a problem where thread stack was overlapping with elf loading
 2023-06-12 01:02:19 +03:00
Bananymous 4ca99fcb4e Kernel: Fix bug in elf loading 
We were allocating one extra page
 2023-06-12 00:59:19 +03:00
Bananymous b254ade69b Kernel: Add SYS_GET_{,E}{UID,GID} 2023-06-11 22:37:00 +03:00
Bananymous ef4ebaa969 Kernel: Add syscalls for set{,e,re}{uid,gid} 2023-06-11 22:37:00 +03:00
Bananymous 51eb44bf40 Kernel/Userspace: Add basic init process 
This process parses /etc/passwd and promps login screen.
When an username is entered, it will launch that users shell
 2023-06-11 22:37:00 +03:00
Bananymous c62e820bcf Kernel: Add basic Credentials for the system 
Now filesystem access/open, etc confirm that you have access for rwxs
 2023-06-11 20:06:06 +03:00
Bananymous 46c34db6cb Kernel: GeneralAllocator and FixedWidth allocator invalidate TLB caches 
We were getting random exceptions when reallocating same addressess and
this fixes that problem :)
 2023-06-11 15:57:48 +03:00
Bananymous 8be28012ee LibC: Reorder some syscalls 2023-06-11 03:29:22 +03:00
Bananymous 5aed186827 Kernel: Add SYS_OPENAT 2023-06-11 03:29:22 +03:00
Bananymous 91f812e17f Kernel: Exceptions will now enable interrupts before calling exit() 
this allows scheduler verification on reschedule() not panic
 2023-06-11 03:29:22 +03:00
Bananymous 52c4eebd77 Kernel: Implement SYS_FSTAT 2023-06-11 03:29:22 +03:00
Bananymous 825ec221b7 Kernel: we don't panic anymore on unrecognized syscall 2023-06-11 00:18:48 +03:00
Bananymous e31080bce3 Kernel: allow open() call with O_SEARCH 2023-06-11 00:18:34 +03:00
Bananymous 7a5d5cabad Kernel: Add syscall for reading directory entries 2023-06-11 00:18:08 +03:00
Bananymous e209ca7c82 Kernel: Rewrite directory listing so it can be integrated to libc 2023-06-11 00:17:18 +03:00
Bananymous db49cbd6e2 Kernel: We now store the processes exit code 2023-06-10 17:31:56 +03:00
Bananymous 97c7fc42d1 Kernel: SpinLocks now reschedule if they cannot aquire the lock 
This allows us to not actually spin doing nothing while waiting for
another (not executing) to release the lock. This api won't probably
work when we get to SMP
 2023-06-09 00:53:32 +03:00
Bananymous 7da0627f8e Kernel: Process::exit() now uses the new Scheduler::reschedule() 
We use this new function while waiting for all blocking threads to
resume execution
 2023-06-09 00:49:19 +03:00
Bananymous 27cef23823 Kernel: Scheduler now has reschedule() 
This can be called from anywhere and just causes the scheduler to
schedule the next thread. This is more efficient and verbose version
of Scheduler::set_current_thread_sleeping(0), since we don't have
to wake other threads or do other verifications.
 2023-06-09 00:47:17 +03:00
Bananymous b7fc2dc3d0 Kenrel: Rename Scheduler::reschedule -> Scheduler::timer_reschedule 2023-06-09 00:41:43 +03:00
Bananymous 8af390e0f6 Kernel: Big commit. Rewrite ELF loading code 
We now load ELF files to VirtualRanges instead of using kmalloc.
We have only a fixed 1 MiB kmalloc for big allocations and this
allows loading files even when they don't fit in there.

This caused me to rewrite the whole ELF loading process since the
loaded ELF is not in memory mapped by every process.

Virtual ranges allow you to zero out the memory and to copy into
them from arbitary byte buffers.
 2023-06-09 00:37:43 +03:00
Bananymous 96d6453ea8 Kernel: PageTableScope locks the PageTable before disabling interrupts 
This allows replacing some PageTableScopes with PageTable::lock()
 2023-06-09 00:34:41 +03:00
Bananymous 2b9900e56e Kernel: get_free_contiguous_pages works with non-page aligned addresses 
also fix bug in ordering
 2023-06-06 02:03:23 +03:00
Bananymous 86f58f60cb LibC: implement setenv, unsetenv, putenv 2023-06-05 22:51:02 +03:00
Bananymous 064ce568c2 Kernel: add basic support for environment variables 
exec functions will search files from PATH
 2023-06-05 22:51:02 +03:00
Bananymous 0b1b4d8f7e Kernel: exec now has better posix errors 2023-06-05 21:12:08 +03:00
Bananymous b0e9ab0519 Kernel/LibC: pass environ pointer to process 2023-06-05 21:12:08 +03:00
Bananymous 668517a723 Kernel: TTY now actually flushes on ^D 2023-06-05 20:21:46 +03:00
Bananymous 649f08ec78 Kernel: verify that loaded elfs are executable 2023-06-05 19:29:32 +03:00
Bananymous 5425394880 Kernel: TTY now supports CSI s and u 
These are commonly supported values to save and load cursor
position
 2023-06-05 18:19:13 +03:00
Bananymous 9d64dbd5c2 Kernel/LibC: add SYS_STAT and stat(), lstat() 2023-06-05 14:37:14 +03:00
Bananymous b68d5a5833 Kernel: Add SYS_WAIT 
This syscall waits for a given pid.
 2023-06-04 18:00:52 +03:00
Bananymous 94d2090777 Kernel: fork() now clones current thread 
This is how posix specifies thread cloning during fork
 2023-06-04 17:40:37 +03:00
Bananymous e97585daf9 Kernel: Process FixedWidthAllocators come now in 4 sizes 2023-06-04 01:26:43 +03:00
Bananymous 924fc2118c Kernel: Allocators are now stored in UniqPtr 
This allows proper memory management, we had some memory leak
 2023-06-04 01:25:57 +03:00
Bananymous 51f4c0c750 Kernel: make load_elf() its own function 2023-06-04 01:24:11 +03:00
Bananymous 37b93da650 Kernel: PhysicalRange maps its nodes to kernel vaddr space 
This keeps the lower half of address space cleaner
 2023-06-04 01:20:47 +03:00
Bananymous 35e739dcdd Kernel: reorder process exit steps 2023-06-04 01:19:04 +03:00
Bananymous 8352392b38 Kernel: You can specify first vaddr for getting free pages 2023-06-04 01:15:48 +03:00