Bananymous/banan-os
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5329ec5912e3f0ec20680ee8c39ee21cec7a3a2d
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2015 Commits
Author SHA1 Message Date
Bananymous 5329ec5912 Kernel: Rework spinlock usage when blocking the current thread 
The old SpinLockAsMutex was pretty confusing first of all. It also was
causing the issue thats been around for maybe a year now which is the
only consistently happening kernel panic. I've been pretty confused
about this and finally figured out what was causing this.

The main issue was that we were accidentally enabling interrupts when
blocking a thread that passed SpinLockAsMutex from normally interrupt
enabled context. This led to receiving IPI for thread unblock while
we were actively blocking the thread. I'm very suprized this had't
caused any more serious issues than occasional kernel panics :^)
 2026-07-20 04:07:23 +03:00
Bananymous edc95e1c09 Kernel: Disable SMP message handling while blocking a thread 
There were some race conditions on a thread getting unblocked before
being moved to the block queue
 2026-07-20 04:07:23 +03:00
Bananymous 51b9dcebbc Kernel: Support FIONBIO ioctl 2026-07-20 04:07:23 +03:00
Bananymous 4df58c5155 Kernel: Check for overflow in seek syscall 2026-07-20 04:07:23 +03:00
Bananymous ecfd98fad0 bootloader: Don't use random packing in memory map 2026-07-08 21:48:14 +03:00
Bananymous 3ee6240806 Kernel: Prioritize EEXISTS sys_mkdir 
This fixes `mkdir -p ...` failing to create existing parents which are
not writable
 2026-07-07 16:59:20 +03:00
Bananymous 0843b8989d Kernel: Fix timer deadline issues in scheduler 
Don't wake up threads when getting the next timer deadline.
If we are idling this can: remove thread from block list, get the
deadline for the next blocked thread, return to idle thread. This will
end up sleeping until the next wake up condition which in the worst
case would be rebalance, or indefinitely when not running SMP.

Make sure we always set the next timer deadline. I was not doing that if
the timer interrupt did not lead to a yield
 2026-07-07 10:30:07 +03:00
Bananymous 49662aa994 Kernel: Don't use peridic interrupts for scheduling 
Scheduler will now set a timer interrupt deadline for when it should get
interrupted next. This fixes a big issue I've had for a long time where
sleeping on an idle core would have to wait for the next periodic
interrupt to wake up. This could cause 1 ms sleeps to be close to 10 ms.

This currently only supports lapic timers and will still fallback to
periodic interrupts when running with PIC. I should add deadline support
to PIT/HPET but why would you run with APIC disabled ;)
 2026-07-07 04:53:41 +03:00
Bananymous eee0b7c3ff Kernel: Make ioctl take unsigned long instead of int 
this is what linux does :D

also fix one or two `return ioctl` instead of `return ioctl_impl`
 2026-07-07 03:12:39 +03:00
Bananymous 7a696c4d63 Kenrel: Cleanup locking in close 2026-07-04 19:19:10 +03:00
Bananymous 89d3ee7b92 Kernel: Use per cpu fast page when clearing SMO pages 2026-07-04 19:18:31 +03:00
Bananymous 879783052d Terminal: Use gnu <start> ... <end> syntax in switch cases 2026-07-04 19:17:41 +03:00
Bananymous 5256fd2e0a LibInput: Add support for right super and application keys 2026-07-04 19:11:30 +03:00
Bananymous 63b2284324 Kernel/LibC: support RDTSCP based clock_gettime 
RDTSCP seems to be faster than LSL and it removes the need for getting
the current cpu twice to make sure TSC is read on the correct CPU
 2026-07-03 06:32:04 +03:00
Bananymous 7219eac65f Kernel: Remove unnecessary page table validation 
Processes always have a page table when they are initialized. This was
not true a long time ago when kernel threads could also be processes
 2026-07-02 20:02:24 +03:00
Bananymous 0dc74beb0f Kernel/LibC: Allocate thread stacks in userspace 
This adds support for pthread function for stack manipulation.

Also keep track of main threads stack in the uthread
 2026-07-02 20:02:24 +03:00
Bananymous 991f7024d5 Kernel: Allow fork to fail at any point 2026-07-02 20:02:24 +03:00
Bananymous 6d1696b77e Kernel: Don't allocate userspace stacks in Thread 
Thread only cares about stack's vaddr and size. Stacks are now allocated
before creating the threads.
 2026-07-02 20:02:24 +03:00
Bananymous b19b7f064a LibC: Make pthread_t pointer to uthread instead of a thread id 
This will allow getting info about other threads in userspace!
 2026-07-02 20:02:24 +03:00
Bananymous f449ca8161 Kenrel: Separate pthread API from kernel API 
It didn't really make sense for the syscalls to be named as the pthread
equivalents. Now the kernel just uses thread ids
 2026-07-02 20:02:24 +03:00
Bananymous 5540bc4147 Kernel: Fix USB SCSI device naming 2026-07-02 20:02:24 +03:00
Bananymous d8f136a76f Kernel: Remove the weird StorageController base class 
This wasn't really used for anything and broke nvme controller as it was
now doubly ref counted :P
 2026-07-02 20:02:24 +03:00
Bananymous 59c59c3316 Kernel: Expose stack base/size and page size in auxv 2026-07-02 20:02:24 +03:00
Bananymous d241975ce1 Kernel: Remove SYS_SLEEP and cleanup SYS_NANOSLEEP 
`sleep` is now implemented in terms of `nanosleep`. `nanosleep` is now
more precise and handles overflow when calculating wakeup time. I don't
think anything was depending on this, but I could see a program sleeping
for max time to block until signal.
 2026-07-02 15:22:52 +03:00
Bananymous 20663b533b Kernel: Rework sleeping API 
instead of sleep_{ns,ms} we now have sleep_{for,until}_{ns,ms}. This
makes code cleaner that just wants to sleep until some timestamp
 2026-07-02 15:22:52 +03:00
Bananymous f121e80bfd Kernel: Fix PROT_EXEC flags in sys_mprotect 2026-06-30 20:14:38 +03:00
Bananymous 4e28a35af9 Kernel: Support hardware checksum offload on RTL8169 receive 2026-06-30 20:14:38 +03:00
Bananymous ddb7641b05 Kernel: Support hardware checksum offload on E1000 receive 2026-06-30 20:14:38 +03:00
Bananymous a6ad9b9b2e Kernel: Add system for hardware checksum offload on received packets 2026-06-30 20:14:38 +03:00
Bananymous c0bd07174d Kernel: Reduce the number of E1000 register reads while receiving 
There is no need to read and write the receive tail pointer for every
packet. This change bumped my TCP speed from ~11MB/s to ~40MB/s which is
my network speed limit
 2026-06-30 20:14:38 +03:00
Bananymous 8f4e15b78e Kernel: Use spinlocks and disable interrupts with loopback interface 
This makes sure we don't get pre-empted after acquiring a descriptor but
before finishing marking it ready
 2026-06-30 20:14:38 +03:00
Bananymous 17e6e53948 Kernel: Move Ethernet header prepending from NIC to helper 2026-06-30 20:14:38 +03:00
Bananymous 223835c37d Kernel: Fix TCP stack sending a lot of DUP-ACKs 2026-06-30 20:14:37 +03:00
Bananymous aedd53b3e0 Kernel: Disable interrupts while appending packet in E1000 
This avoids getting rescheduled and having other packets waiting to get
sent because of that
 2026-06-30 20:14:37 +03:00
Bananymous 6339044e4c Kernel: Fix RTL8169 driver 
This now works properly on real hardware. Main issue was a race
condition with now ISR was handled in the interrupt handler. We now loop
until we read back ISR as zero
 2026-06-30 20:14:37 +03:00
Bananymous 6e47fa084b Kernel: Fix ext2 indirect block lookup math 
This was broken for doubly and triply indirect blocks :D
 2026-06-30 20:14:37 +03:00
Bananymous 9919cbf66e Kernel: Pass interpreter base address in auxiliary vector 2026-06-30 20:14:37 +03:00
Bananymous fc1a6cacdc Kernel: Optimize process stopping 2026-06-27 03:24:15 +03:00
Bananymous 040bdea08e Kernel: Support volume keys from USB consumer page 2026-06-27 03:24:15 +03:00
Bananymous 579cd07109 Kernel: Expose process cpu time in proc filesystem 2026-06-27 03:24:15 +03:00
Bananymous 7bf7de44d2 Kernel: Support SO_TYPE and SO_KEEPALIVE getsockopt in UNIX socket 2026-06-27 03:24:15 +03:00
Bananymous 58aff97c28 Kernel: Implement getsockname for UNIX sockets 2026-06-27 03:24:15 +03:00
Bananymous 2bb9b9b4b3 Kernel: Don't read CR registers on every exception 2026-06-27 03:24:15 +03:00
Bananymous 59ec05c898 Kernel: Make TSC based timer monotonic 
Prior to this I was just blindly rebasing the current TSC stats every
once in a while. Now I check for drift and scale the multiplier
accordingly to keep the timer from drifting
 2026-06-27 03:24:15 +03:00
Bananymous ac0ef53e87 Kernel: Fix HPET interrupt routing 
If the HPET did not support legacy routing we would still use IRQ0 which
lead to using PIT irq which fired ~18 times per second
 2026-06-27 03:24:15 +03:00
Bananymous 92d10f612e Kernel: Make sure PCIeInfo is zero initialized 2026-06-25 01:42:02 +03:00
Bananymous f3f40a465b Kernel: Fix HDA amplifier step size calculation 
step size is zero based, 0 means 250 mdB
 2026-06-25 01:41:41 +03:00
Bananymous d3130884b6 Kernel: Hack TTY to work as debug console 
debug printing takes the debug lock, but TTY uses mutex for its lock
 2026-06-25 01:41:41 +03:00
Bananymous 98fd86477a Kernel: Remove allocations from path lookup 
this bumped looped /usr/bin/ls stat performance from 750k->1100k/s
 2026-05-26 19:10:16 +03:00
Bananymous 16a442f473 Kernel: Fix Thread::will_exit_because_of_signal 
I was not checking whether the signal handler has been overwritten to
ignore the signal leading to infinite busy loops :)
 2026-05-26 03:31:20 +03:00