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123 Commits

Author SHA1 Message Date
Bananymous 4f25c20c97 Kernel: Canonicalize vaddr before using it 2023-10-30 19:20:17 +02:00
Bananymous 3bac19e518 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 26c7aee327 Kernel: only map kernel from g_kernel_start onwards 2023-10-30 16:22:02 +02:00
Bananymous 8a10853ba7 Kernel: Enable Write Protect. This seems to be good for security 2023-10-30 12:23:22 +02:00
Bananymous 5d34cebeca 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 f05b9a6877 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 e2e5c31d54 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 be3efb0b92 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 45a6783c3d Kernel: Cleanup GDT code 2023-10-13 16:18:22 +03:00
Bananymous 5630f64175 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 bcf62c5f2e 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 b51d2f5295 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 547eabb403 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 b4e4f7a6cc Kernel: Print more detailed output on ISR 2023-09-25 20:33:07 +03:00
Bananymous fe2dca16f0 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 bc1087f5a7 Kernel: Add pointer validation API to page table 2023-09-22 17:20:35 +03:00
Bananymous 82b049204d Kernel: Print stack trace on isr 2023-09-11 01:20:55 +03:00
Bananymous 720bc418a6 All: Clear lines with only whitspace in them 2023-09-10 00:31:42 +03:00
Bananymous 51532336b0 Kernel: Move structures in boot.S to .data section 2023-08-11 00:26:12 +03:00
Bananymous fd2bcc9156 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 008c777a9f 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 198e6d7cf6 Kernel: Start work on abstracting Timers 2023-08-04 10:29:42 +03:00
Bananymous e57c1fc9fc 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 a11b5ae41f Kernel: align userspace stacks 
I was getting #GP on sse instructions
 2023-08-03 18:09:48 +03:00
Bananymous 91f04ce250 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 926df2b276 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 217dbca7b7 Kernel: Cleanup returns from any kind on interrupts 2023-08-01 14:23:50 +03:00
Bananymous 8b1bccb79b 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 e86e755c51 Kernel: Generally improve signals 2023-07-31 22:28:18 +03:00
Bananymous 08cdf88586 Kernel: Cleanup signal trampoline 2023-07-30 15:58:35 +03:00
Bananymous 6f7d97cf94 Kernel: Remove is_in_syscall from Thread 2023-07-30 14:49:51 +03:00
Bananymous 5e434f5131 Kernel: Hardware exceptions now sends signals to userspace 2023-07-30 14:34:15 +03:00
Bananymous f7bf6d5e62 Kernel: Change signal kernel API 
return rsp and rip are now stored per thread
 2023-07-23 18:33:10 +03:00
Bananymous adb14ba373 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 217e5f81cc Kernel: add default signal actions 2023-07-21 18:02:35 +03:00
Bananymous dcd4d0daeb 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 faf4220b38 Kernel: kernel memory takes now full pml4e 
This allows flags to work properly
 2023-07-21 13:47:05 +03:00
Bananymous 193ddaa2f6 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 46eb27883a Kernel: Don't map kernel executable memory as writable 2023-07-21 11:17:39 +03:00
Bananymous 2db7cdb71e Kernel: Syscalls now get the interrupt stack 2023-07-21 11:04:16 +03:00
Bananymous ba9fa00947 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 6c1ada8d0a Kernel: Enable global bit on kernel pages 2023-07-13 15:23:25 +03:00
Bananymous 7d00c2670f Kernel: Support execute disable bit 
We will now map executable memory explicitly as executable.
 2023-07-13 14:28:53 +03:00
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 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 d354cccd37 Kernel: Add enum for ISR name to number 2023-06-18 23:24:27 +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 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 db49cbd6e2 Kernel: We now store the processes exit code 2023-06-10 17:31:56 +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