Commit Graph

269 Commits

Author SHA1 Message Date
Bananymous dfe5a2d665 All: Cleanup all files
Add newline to end of files and remove whitespace from end of lines
2024-01-24 15:53:38 +02:00
Bananymous b0ff2392a1 Kernel: Add some helpful debug prints
Log RIP when stack pointer is out of bounds.

Log all syscalls that return ENOTSUP
2024-01-03 02:08:01 +02:00
Bananymous 001e95f973 Kernel: Optimize sse saving/loading
Only save and load sse when new thread is trying to execute sse
instruction. There is no need to do that every time we enter kernel.
2024-01-03 02:06:49 +02:00
Bananymous 4307968182 All: Start work again on sse support 2023-12-28 19:14:42 +02:00
Bananymous 284a012509 Kernel: Add framebuffer information to kernel image 2023-12-09 17:33:58 +02:00
Bananymous 1c78671078 Kernel: Rework all signal code
Signal handling code was way too complex. Now everything is
simplified and there is no need for ThreadBlockers.

Only complication that this patch includes is that blocking syscalls
have to manually be made interruptable by signal. There might be some
clever solution to combat this is make this happen automatically.
2023-12-06 13:02:17 +02:00
Bananymous 84040e64b8 Kernel: Don't use multiboot2 explicitly. Parse it to common structure
This allows support of multiple different bootloaders
2023-11-17 18:54:59 +02:00
Bananymous ca34ece8ef BAN: Update ASSERT api
its now much harder to mix < with <= and > with >=
2023-11-02 00:01:12 +02:00
Bananymous 71ecdd7245 Kernel: Canonicalize vaddr before using it 2023-10-30 19:20:17 +02:00
Bananymous 42772611ce Kernel: Add fast page to page table
Add "fast page" to KERNEL_OFFSET. This is always present in page
tables and only requires changing the page table entry to map. This
requires no interrupts since it should only be for very operations
like memcpy.

I used to map all temporary mappings to vaddr 0, but this is much
better. C++ standard always says that nullptr access is undefined
and this gets rid of it.

Fixed some bugs I found along the way
2023-10-30 19:02:09 +02:00
Bananymous 0c590821ed Kernel: only map kernel from g_kernel_start onwards 2023-10-30 16:22:02 +02:00
Bananymous 6ef153b6ca Kernel: Enable Write Protect. This seems to be good for security 2023-10-30 12:23:22 +02:00
Bananymous 130a69bac6 Kernel: Fix stack OOB detection
I now check both interrupt and normal stack to detect OOB. Processes
are killed if they encouner stack over/under flow.
2023-10-30 12:17:08 +02:00
Bananymous 0b5fcb3f88 Kernel/LibC: Add crt* files to LibC and remove crt0 from kernel
There was no reason for libc get crt0 from kernel.
2023-10-30 11:06:13 +02:00
Bananymous c17cdb39d5 Kernel: Map multiboot2 memory in PageTable initialization
It cannot be assumed that multiboot data lies between kernel_end
and 2 GiB mark, so I properly allocate virtual address space for it.
2023-10-17 01:15:08 +03:00
Bananymous 69a39b7077 Kernel: Start using multiboot2 instead of multiboot
This allows better compatibility with (U)EFI and gives RSDP location
instead of me having to scan ram to find it.
2023-10-17 01:06:24 +03:00
Bananymous 128202a55a Kernel: Cleanup GDT code 2023-10-13 16:18:22 +03:00
Bananymous 518fd3fad0 Kernel: Add 16 more irq handlers
IDT will now panic if trying to assing handler for non supported
irq.
2023-10-13 16:17:27 +03:00
Bananymous 27eb5af6f0 Kernel: Rework interrupt mechanism
All interruptrable classes now inherit from Interruptable which
has methdo handle_irq which is called on a interrupt.
2023-10-05 18:53:45 +03:00
Bananymous 245f58cc3a Kernel: mmap regions are now demand paged
mmap will not actually take any memory unless you use the given
memory.
2023-09-28 21:07:14 +03:00
Bananymous d7ecf94347 Kernel: Reboot will now always succeed
If acpi reset fails, we forcefully trigger a triple fault to restart
the system.
2023-09-28 13:53:03 +03:00
Bananymous 976114fde1 Kernel: Print more detailed output on ISR 2023-09-25 20:33:07 +03:00
Bananymous 7a7c5e433e Kernel/LibC: add flag to enable/disable sse support
SSE support is very experimental and causes GP. I decided to make
SSE not default until I get to fixing it :)
2023-09-23 02:28:25 +03:00
Bananymous dd0b8c4140 Kernel: Add pointer validation API to page table 2023-09-22 17:20:35 +03:00
Bananymous 7ec860a3d4 Kernel: Print stack trace on isr 2023-09-11 01:20:55 +03:00
Bananymous 921d95d18f All: Clear lines with only whitspace in them 2023-09-10 00:31:42 +03:00
Bananymous f75adab9d8 Kernel: Move structures in boot.S to .data section 2023-08-11 00:26:12 +03:00
Bananymous 0b8396b1a6 Kernel: IDT now sends EOI for every interrupt
EOI is sent before calling the interrupt handler. This should be fine
since all interrupts are processed with interrupts disabled
2023-08-09 09:57:02 +03:00
Bananymous 6fcb191ca0 Kernel: Add PageTable::Flags::CacheDisable
Also fix multiple places where we were using uint8_t as page table
flags instead of PageTable::flags_t which we promoted to uint16_t
while back.
2023-08-06 23:59:30 +03:00
Bananymous 659adb89a6 Kernel: Start work on abstracting Timers 2023-08-04 10:29:42 +03:00
Bananymous 643e87a076 Kernel: Threads are deleted sooner and cleaner
We now delete threads when
    1. it is marked as Terminated and is the current thread
    2. it tries to start execution in Terminated state

This allows us to never have thread executing in Terminated state
2023-08-04 10:29:42 +03:00
Bananymous 20eafb4cc4 Kernel: align userspace stacks
I was getting #GP on sse instructions
2023-08-03 18:09:48 +03:00
Bananymous 3139391e06 Kernel: Change PageTable API
Getting free pages not reserves them, so you don't have to hold
the page table lock :)
2023-08-02 22:09:14 +03:00
Bananymous 64ad752e73 Kernel: PageTable now supports reserved pages
You can now map pages as reserved, so that they will not be given
from get_free_page() or get_free_contiguous_pages().
2023-08-01 16:35:54 +03:00
Bananymous a78a7ed156 Kernel: Cleanup returns from any kind on interrupts 2023-08-01 14:23:50 +03:00
Bananymous b245a55ea0 Kernel: store/load sse/mmx/fpu state on isr/irq/syscall
I haven't tested this yet but should be fine. This will be optimized
to only save state from threads that are using it
2023-07-31 22:28:57 +03:00
Bananymous c4f6c859c1 Kernel: Generally improve signals 2023-07-31 22:28:18 +03:00
Bananymous 1a6100f083 Kernel: Cleanup signal trampoline 2023-07-30 15:58:35 +03:00
Bananymous de927b6b05 Kernel: Remove is_in_syscall from Thread 2023-07-30 14:49:51 +03:00
Bananymous 1d7795e22c Kernel: Hardware exceptions now sends signals to userspace 2023-07-30 14:34:15 +03:00
Bananymous 9729e5a05b Kernel: Change signal kernel API
return rsp and rip are now stored per thread
2023-07-23 18:33:10 +03:00
Bananymous 2dce0a0415 Kernel: Userspace signal handlers are now called one at a time
I added a syscall for telling the kernel when signal execution has
finished. We should send a random hash or id to the signal trampoline
that we would include in the syscall, so validity of signal exit can
be confirmed.
2023-07-23 13:34:53 +03:00
Bananymous 8063700d7b Kernel: add default signal actions 2023-07-21 18:02:35 +03:00
Bananymous c2cf98e32f Kernel/LibC: Add bareboness signals
You can now call raise() to raise a signal. Signal handlers are
not yet supported, but the handling works :)
2023-07-21 15:45:02 +03:00
Bananymous a1db032ba9 Kernel: kernel memory takes now full pml4e
This allows flags to work properly
2023-07-21 13:47:05 +03:00
Bananymous 5babd7b4f2 Kernel: remove PAGE_FLAGS_MASK as that was not correct anymore
After I added NXE bit, the flags mask is no longer valid
2023-07-21 12:01:50 +03:00
Bananymous c0029a2fa2 Kernel: Don't map kernel executable memory as writable 2023-07-21 11:17:39 +03:00
Bananymous 4e35b8b49d Kernel: Syscalls now get the interrupt stack 2023-07-21 11:04:16 +03:00
Bananymous bf5d74b8bc Kernel: fix memory leak in PageTable
PageTable used to leak 2 pages on creation and other two on deletion
2023-07-19 23:17:39 +03:00
Bananymous 98c698d9ec Kernel: Enable global bit on kernel pages 2023-07-13 15:23:25 +03:00
Bananymous 9ea2c1d932 Kernel: Support execute disable bit
We will now map executable memory explicitly as executable.
2023-07-13 14:28:53 +03:00
Bananymous 4086d7c3be 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 9a7b2587af 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 57e59d998f Kernel: Add enum for ISR name to number 2023-06-18 23:24:27 +03:00
Bananymous 23543b15ca 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 caca6dc701 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 4cdeb98897 Kernel: We now store the processes exit code 2023-06-10 17:31:56 +03:00
Bananymous 841584ccbd 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 896b919c9d Kernel/LibC: pass environ pointer to process 2023-06-05 21:12:08 +03:00
Bananymous b403155ca9 Kernel: You can specify first vaddr for getting free pages 2023-06-04 01:15:48 +03:00
Bananymous b168462b43 Kernel: PageTable now has debug_dump
This dumps all the mapped pages and their flags
2023-06-03 20:08:13 +03:00
Bananymous 68691faca1 Kernel: boot.S is back to 2 MiB pages
bochs doesn't seem to support 1 GiB pages
2023-06-03 18:53:36 +03:00
Bananymous dcb23f686f Kernel: boot.S maps GiB as single pdpte 2023-05-31 00:51:15 +03:00
Bananymous 650570e57d Kernel: Fix comment 2023-05-31 00:51:15 +03:00
Bananymous 1f5a36f074 Kernel: PageTable destructor works now
we are successfully booting higher half kernel now :)
2023-05-31 00:44:14 +03:00
Bananymous aeaf2cd3f1 Kernel: PageTable::create_userspace() now works 2023-05-31 00:44:14 +03:00
Bananymous 67886b0c5a Kernel: Move V2P and P2V to Memory/Types.h 2023-05-30 23:57:03 +03:00
Bananymous 56eb6fb4ce Kernel: PageTable::map_range_at maps correctly the last page 2023-05-30 23:56:07 +03:00
Bananymous 81cf389754 Kernel: Booting with higher half kernel gets to Heap initialization 2023-05-30 22:21:12 +03:00
Bananymous 0907965dc5 Kernel: start work on higher half kernel 2023-05-30 08:00:17 +03:00
Bananymous 210d90ec79 Kernel: We now identity map full GiB in boot.S
The paging structure is pre-built so no unnecessary calculations are done
2023-05-30 00:08:52 +03:00
Bananymous 5bb1f2a48c Kernel: Rename MMU to PageTable
This is more descriptive name for what it actually represents
2023-05-29 21:06:09 +03:00
Bananymous fb17af4844 Kernel/LibC: opening standard files is done in libc 2023-05-29 20:21:19 +03:00
Bananymous b8ec8918b7 Kernel: We can't lock the MMU lock in load()
It needs to be callable always by scheduler
2023-05-29 19:39:35 +03:00
Bananymous ff83f967d8 Kernel: Make RecursiveSpinLock thread safe
also SpinLock is now implemented with gcc builtins
2023-05-29 19:38:09 +03:00
Bananymous ec73db0057 Kernel: Move page macros to Types.h 2023-05-28 21:03:08 +03:00
Bananymous 833642d405 Kernel: ISR will now crash userspace process instead of panicing kernel 2023-05-28 20:53:10 +03:00
Bananymous 3e93dae53c Kernel: Add invalidate() to MMU 2023-05-28 18:05:49 +03:00
Bananymous 187bb046aa Kernel: fix MMU::map_page_at()
We used to only reassign if flags changed
2023-05-28 17:57:05 +03:00
Bananymous 869de7283f Kernel: MMU::get() is now MMU::kernel
MMU is can now be locked with RecursiveSpinLock.

Scheduler now has get_current_tid() that works before the Scheduler
is initialized. This allows RecursiveSpinLock usage early on.
2023-05-28 16:18:18 +03:00
Bananymous e0a72defa2 Kernel: Add argc and argv to process entry 2023-05-16 00:27:49 +03:00
Bananymous 6acb86c14b Kernel: MMU keeps track of the current 2023-05-16 00:26:39 +03:00
Bananymous ec316391c5 Kernel: argc is passed as zero to userspace 2023-05-11 18:28:32 +03:00
Bananymous ff2e2937a5 Kernel: Remove offset from OpenFileDescriptor
This is now handled on the libc side. There might be reasons to
have it in kernel side, but for simplicity's sake I'm moving it
to libc for now :)
2023-05-09 20:31:22 +03:00
Bananymous 512be884ed Kernel: Add barebones GeneralAllocator for >4096B 2023-05-08 22:10:49 +03:00
Bananymous ab8aac7dcf Kernel: GDT tss selector is now 16 bit value 2023-05-06 17:34:22 +03:00
Bananymous f36b94d039 Kernel: MMU can now provide info about virtual address space 2023-05-06 17:34:22 +03:00
Bananymous 92daa831d1 Kernel: ISRs now print pid and tid 2023-05-06 00:10:15 +03:00
Bananymous e7a170c89f Kernel: 64 bit MMU now properly identity maps kernel 2023-05-05 14:19:28 +03:00
Bananymous 55bb0084aa Kernel: namespace and function renames
MMU moved to namespace kernel
Kernel::Memory::Heap moved to just Kernel
MMU::map_{page,range} renamed to identity_map_{page,range}

Add MMU::get_page_flags
2023-04-28 14:48:38 +03:00
Bananymous acf5660090 Kernel: Add set_tss_stack() to 32 bit 2023-04-28 14:44:23 +03:00
Bananymous f1a0625b61 Kernel: TSS stack can be set after initialization 2023-04-25 14:48:12 +03:00
Bananymous fb6add2b4a Kernel: Fix 32 bit MMU 2023-04-22 18:22:39 +03:00
Bananymous e0ce2394fe Kernel: Remove obsolete userspace stuff from kernel 2023-04-22 15:38:45 +03:00
Bananymous fc71d2f7c4 Kernel: Don't call 'cli' on interrupt
This is automatically done because we are using interrupt gates
in the IDT
2023-04-21 11:18:08 +03:00
Bananymous 35e949ef5e Kernel: Fix syscall return value in 32 bit 2023-04-21 11:08:02 +03:00
Bananymous 9c506ef85b Kernel: Stack pointer is validated when updated
This allows us not to fail stack pointer when in syscall since
interrupts use their own stack
2023-04-21 10:40:24 +03:00
Bananymous b1c7af38d0 Kernel: Add barebones per process virtual addresses
We now assign every (userspace) process its own MMU which we load
in scheduler. This allows every process to have separate virtual
address space.

This is very hackish implementations but it works for now
2023-04-20 00:45:41 +03:00
Bananymous ea0c9b639f Kernel: Add some bareboness functionality to map virtual addresses 2023-04-19 23:51:36 +03:00
Bananymous 0030f035be Kernel: Rename MMU::{un,}allocate... to MMU::{un,}map
This is more appropriate name for the behaviour :D
2023-04-19 21:50:30 +03:00