98c698d9ec
Kernel: Enable global bit on kernel pages
2023-07-13 15:23:25 +03:00
9ea2c1d932
Kernel: Support execute disable bit
...
We will now map executable memory explicitly as executable.
2023-07-13 14:28:53 +03:00
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
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
57e59d998f
Kernel: Add enum for ISR name to number
2023-06-18 23:24:27 +03:00
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
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
4cdeb98897
Kernel: We now store the processes exit code
2023-06-10 17:31:56 +03:00
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
896b919c9d
Kernel/LibC: pass environ pointer to process
2023-06-05 21:12:08 +03:00
b403155ca9
Kernel: You can specify first vaddr for getting free pages
2023-06-04 01:15:48 +03:00
b168462b43
Kernel: PageTable now has debug_dump
...
This dumps all the mapped pages and their flags
2023-06-03 20:08:13 +03:00
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
dcb23f686f
Kernel: boot.S maps GiB as single pdpte
2023-05-31 00:51:15 +03:00
650570e57d
Kernel: Fix comment
2023-05-31 00:51:15 +03:00
1f5a36f074
Kernel: PageTable destructor works now
...
we are successfully booting higher half kernel now :)
2023-05-31 00:44:14 +03:00
aeaf2cd3f1
Kernel: PageTable::create_userspace() now works
2023-05-31 00:44:14 +03:00
67886b0c5a
Kernel: Move V2P and P2V to Memory/Types.h
2023-05-30 23:57:03 +03:00
56eb6fb4ce
Kernel: PageTable::map_range_at maps correctly the last page
2023-05-30 23:56:07 +03:00
81cf389754
Kernel: Booting with higher half kernel gets to Heap initialization
2023-05-30 22:21:12 +03:00
0907965dc5
Kernel: start work on higher half kernel
2023-05-30 08:00:17 +03:00
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
5bb1f2a48c
Kernel: Rename MMU to PageTable
...
This is more descriptive name for what it actually represents
2023-05-29 21:06:09 +03:00
fb17af4844
Kernel/LibC: opening standard files is done in libc
2023-05-29 20:21:19 +03:00
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
ff83f967d8
Kernel: Make RecursiveSpinLock thread safe
...
also SpinLock is now implemented with gcc builtins
2023-05-29 19:38:09 +03:00
ec73db0057
Kernel: Move page macros to Types.h
2023-05-28 21:03:08 +03:00
833642d405
Kernel: ISR will now crash userspace process instead of panicing kernel
2023-05-28 20:53:10 +03:00
3e93dae53c
Kernel: Add invalidate() to MMU
2023-05-28 18:05:49 +03:00
187bb046aa
Kernel: fix MMU::map_page_at()
...
We used to only reassign if flags changed
2023-05-28 17:57:05 +03:00
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
e0a72defa2
Kernel: Add argc and argv to process entry
2023-05-16 00:27:49 +03:00
6acb86c14b
Kernel: MMU keeps track of the current
2023-05-16 00:26:39 +03:00
ec316391c5
Kernel: argc is passed as zero to userspace
2023-05-11 18:28:32 +03:00
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
512be884ed
Kernel: Add barebones GeneralAllocator for >4096B
2023-05-08 22:10:49 +03:00
ab8aac7dcf
Kernel: GDT tss selector is now 16 bit value
2023-05-06 17:34:22 +03:00
f36b94d039
Kernel: MMU can now provide info about virtual address space
2023-05-06 17:34:22 +03:00
92daa831d1
Kernel: ISRs now print pid and tid
2023-05-06 00:10:15 +03:00
e7a170c89f
Kernel: 64 bit MMU now properly identity maps kernel
2023-05-05 14:19:28 +03:00
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
f1a0625b61
Kernel: TSS stack can be set after initialization
2023-04-25 14:48:12 +03:00
e0ce2394fe
Kernel: Remove obsolete userspace stuff from kernel
2023-04-22 15:38:45 +03:00
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
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
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
ea0c9b639f
Kernel: Add some bareboness functionality to map virtual addresses
2023-04-19 23:51:36 +03:00
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
6a3b3213cf
Kernel: Kmalloc now has its memory statically allocated
...
We don't use the memory map given by bootloader since this automatically
maps the memory to a available space.
2023-04-18 10:18:15 +03:00
fdb4eb6042
Kernel: Move kmalloc and MMU to Memory directory
2023-04-18 10:18:15 +03:00
3f9d6f0311
LibC: add needed stubs to build executables with our compiler
2023-04-12 17:53:02 +03:00
8ee63f8264
Kernel: We can create basic userspace processes
...
These are still allocated on the kernel memory
2023-04-12 17:52:36 +03:00
f924ac9265
Kernel: Threads can now be terminated mid execution
2023-04-10 21:07:25 +03:00
3f01f936a1
Kernel: Fix framepointers on started threads
2023-04-10 21:07:25 +03:00
25ddc24754
BuildSystem: cmake can now build out libc
...
I can't seem to get libc++ build to work...
2023-04-10 21:07:25 +03:00
c936aac777
Kernel: Optimize scheduler idling
...
Now after each interrupt we will ask the scheduler to reschedule
if the current thread is the idle thread. This allows semaphore
unblocking to be practically instant when there is only one thread
executing.
Now disk reading is back to ~3 MB/s for single threaded process
2023-04-03 01:51:05 +03:00
4c5176f751
BuildSystem: We are now using cmake instead of plain make
...
I have been annoyed for a while since I had to build everything
when running the os since the buildsystem was really bad.
I wanted to rewrite the whole build system and changed to using cmake
:)
2023-04-02 04:07:27 +03:00
8b8e3cbbf0
Kernel/Userspace: Start initial work on userspace and syscalls
2023-03-13 15:32:46 +02:00
af854ec9e1
Kernel: Thread creation now takes void(*)() as entry and void* as data
...
This simplifies threading for the future and gets rid of (undefined?)
cast of member function pointer to address
2023-03-09 15:33:42 +02:00
ed18d86f08
Kernel: Fix spinlock unlocking in x86_64
...
Spinlock unlock used a 64 bit write on 32 bit integer, overwriting
some random memory. This caused some really hard to find bugs
2023-03-08 02:41:44 +02:00
df8811fc1a
Kernel: Remove "a" from .section .text
2023-03-07 01:57:09 +02:00
06db890d49
Kernel: Add ubsan
...
My brain has been melting since I'm getting very random bugs.
I hope I can debug them better with ubsan :)
2023-03-06 23:38:05 +02:00
1dd61e93b6
Kernel: Threads cannot take arguments anymore
2023-03-02 01:56:09 +02:00
7fcbb869e1
Kernel: Initialize GDT in kernel code
...
We dont use the boot GDT only while booting
2023-03-01 21:21:56 +02:00
7f8cad83b1
Kernel: x86_64 boot script now makes GDT with null, kernel code and data
2023-03-01 21:21:56 +02:00
9756de02ef
Kernel: MMU now takes flags when allocating pages
2023-03-01 21:21:56 +02:00
80f9428337
Kernel: Fix prefs font for 32 bit
2023-02-24 03:19:54 +02:00
c9ea22f5e2
Kernel: IDT now confirms that it allocated succesfully
2023-02-22 21:48:40 +02:00
d9c05b7378
Kernel: rewrite the whole kmalloc (again)
...
Performance of the old kmalloc implementation was terrible.
We now use fixed-width linked list allocations for sizes <= 60 bytes.
This is much faster than variable size allocation.
We don't use bitmap scanning anymore since it was probably the slow
part. Instead we use headers that tell allocations size and aligment.
I removed the kmalloc_eternal, even though it was very fast, there is
not really any need for it, since the only place it was used in was IDT.
These changes allowed my psf (font) parsing to go from ~500 ms to ~20 ms.
(coming soon :D)
2023-02-22 16:32:50 +02:00
1bd8b0fe5c
Kernel: Sleep now actually sleeps and allows idling
2023-02-19 18:52:25 +02:00
6fab26692b
Kernel: remove unnecessary function from x86_64 Thread.S
2023-02-02 23:48:18 +02:00
5b5e620d8a
Kernel: Improve multithreading support
...
We can now use arbitary BAN::function<void(...)> as the Thread.
I also implemented multithreading for i386 since it was not done
on the initial multithreading commit.
2023-02-02 23:24:12 +02:00
9b8de5025a
All: rename every function from UpperCamelCase to snake_case
...
This was a mess since I didn't know which to use but now I decided
to go with snake_case :)
2023-02-01 21:05:44 +02:00
337569b0ca
Kernel: Implement basic SpinLock
2023-02-01 01:52:52 +02:00
cb3b62d665
Kernel: Only allocate single GDT entry during boot.S
...
When we need more, we should probably initialize rest of them
in cpp code
2023-01-31 18:43:09 +02:00
1687028ed5
Kernel: Add constructor and destructor to MMU
2023-01-30 18:54:04 +02:00
6dc22b7251
Kernel: Add actual register values to x86_64 kernel panic
...
Very hackish implementation, but we now get actual registers at the
time of the interrupt happening
2023-01-30 18:52:38 +02:00
6418d7cfc3
Kernel: Add Other GDT entries to x86_64
2023-01-26 12:53:04 +02:00
35d2e27292
Kernel: Improve MMU
...
We don't have to invalidate page in AllocatePage() if we don't make
any changes. We also should not assert on deallocating non-present
pages, just return early :)
2023-01-26 02:57:14 +02:00
589f338357
Kernel: Cleanup IDT register dump inline assembly
2023-01-26 02:57:14 +02:00
e87026f01d
Kernel: I have no idea what this commit does
...
I had committed a change in IDT but reverted it now.
This propably only adds a spurious interrupt detection to common cpp
interrupt handler?
2023-01-26 02:55:37 +02:00
b315fdc27f
Kernel: Finally managed to get 64-bit working
...
I had weird problems with interrupts but everything should work now
2023-01-25 19:19:28 +02:00
Bananymous