27448611b3
UserMemory: do not map refs into kernel memory
...
This is bad design. But it fails if mapped, since something overwrites KernelHeap.
2022-10-20 18:50:07 +02:00
712f4f5e51
KernelHeap: Add more debug logging
2022-10-20 18:49:33 +02:00
47bdfecedb
Devices: Add /dev/uptime
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This file contains how many milliseconds have passed since boot at the time of reading it :)
2022-10-19 21:11:12 +02:00
3c5c92c7c3
sh: Add a simple interactive shell
2022-10-19 19:42:05 +02:00
b035795eb3
Kernel: Move errno.h and (k)assert.h out of the main include directory
...
This is mostly so IDEs don't pick them up instead of the userspace headers :)
2022-10-19 17:41:23 +02:00
48d4a5910a
Kernel: Add a few convenience functions to manipulate userland memory
2022-10-19 17:13:16 +02:00
671f2a2de3
Kernel, libc: Implement waitpid()
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FIXME: exec() is now doing weird page table stuff. But at least it works, no panics :)
2022-10-18 21:30:52 +02:00
52d391507d
Kernel: Rename the getpid() syscall to getprocid()
...
Now, we have one single system call to fetch all sorts of identifiers:
PID, PPID, UID, GID; EUID, EGID, and more...
2022-10-18 17:36:17 +02:00
a9d3bdba6f
Kernel: Keep track of a task's PPID
2022-10-18 17:18:37 +02:00
4f41b9ed37
Scheduler: Implement a find_by_pid function
2022-10-17 20:40:38 +02:00
8b17065718
Kernel, libc: Rename gettid() to getpid() and move it to unistd.h
2022-10-17 20:08:44 +02:00
87ef210759
Kernel, libc: Remove spawn()
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Now, fork() and exec() are both implemented. More POSIX-y, thus spawn can be removed.
2022-10-17 19:55:01 +02:00
ea8a42b8c0
Kernel: Add a name field to the Task structure
2022-10-17 19:12:47 +02:00
92634048fc
UserHeap: some nice improvements
2022-10-17 18:49:19 +02:00
64f5078494
Kernel, libc: Implement fork()
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This time for real.
Also, add a new per-user-task virtual address allocator (UserHeap), so that mmap'ed pages are in user range and can be copied.
2022-10-17 18:43:35 +02:00
682be58d97
AddressSpace: copy instead of linking
2022-10-17 17:24:33 +02:00
250db2c90f
Scheduler: add an append_task() function
2022-10-17 17:14:22 +02:00
c2fa4f380d
Kernel: Use the new Task member functions
2022-10-17 17:07:25 +02:00
891651f2d6
Task: Move functions operating on Task to member functions
...
Also, add an alloc_fd_greater_than_or_equal() function, for use in fcntl(F_DUPFD)
2022-10-17 17:00:07 +02:00
9b39d618de
Kernel, libc: Implement spawn()
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This function is a Luna alternative to fork() and exec().
Why? Simply because I can't figure out for the life of me how to implement a working fork().
So meanwhile, we have spawn() as a replacement. exec() still exists, though.
2022-10-16 18:48:35 +02:00
a1146a5ce2
Panic: show panic message on screen
2022-10-16 18:23:33 +02:00
d2e2883a79
Kernel: Make mkdir() accessible to userspace
2022-10-16 17:22:12 +02:00
18fbccafb7
VFS: add an exists() function
2022-10-16 16:58:18 +02:00
f8154ce230
Kernel: Implement mkdir() from a single path
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This is done using dirname() and basename() :)
2022-10-16 14:45:25 +02:00
8c0a57f0c2
Kernel: Copy strrchr, dirname and basename over from libc
2022-10-16 14:36:25 +02:00
68403dc029
Kernel: Make AddressSpaces reference-counted
2022-10-15 17:40:33 +02:00
aca1367158
Kernel: Switch to strlcpy() as well
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Surprisingly, most uses of strncpy() are in places where strncpy() is actually a better choice.
For example, copying to a fixed-length char array in a structure.
2022-10-15 17:30:34 +02:00
4bad782aad
Kernel: Increment the maximum number of file descriptors a task can have
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Doesn't use up more space in the Task structure, and now we are above the Minimum Acceptable Value as defined by POSIX (20), I think.
2022-10-15 14:20:29 +02:00
62a2bcf2ff
Kernel: Add a clock() system call
2022-10-15 13:17:26 +02:00
3a9dddaa57
Kernel, libc: Remove the rand() system call
...
That's why we now have a VFS and a /dev pseudo-filesystem. To provide that kind of things.
Remember, everything is a file!!
The new way to ask the kernel for random numbers is to read from /dev/random.
2022-10-15 13:04:48 +02:00
613f8170b6
Kernel, libc: Implement mprotect() and use proper PROT_* values
2022-10-15 12:57:14 +02:00
62d631f1b4
Kernel: Rename assert.h to kassert.h so IDEs pickup the kernel header instead of the userspace one
2022-10-15 12:56:48 +02:00
36bb1cab5c
FileDescriptor: add operator=() so that the fcntl(F_DUPFD syscall compiles :)
2022-10-15 11:16:18 +02:00
5c61252061
Kernel: Add a new fcntl() system call
2022-10-15 10:56:06 +02:00
3eb1bff2e9
Task: add an alloc_fd() function
2022-10-15 10:45:12 +02:00
91d76a2ee4
Devices: Add a new RandomDevice :)
...
This new device uses the seeded Mersenne PRNG we use in the kernel.
This device is not meant for regular userspace use, but more for userspace to seed their own PRNGs from.
If the DeviceFS is mounted at /dev, this device can be found at /dev/random.
2022-10-14 20:14:49 +02:00
e0aa552fae
Kernel: Add a move() function
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The standard C++ move() function.
2022-10-14 19:04:56 +02:00
1c3377fc98
Prepare for cloning address spaces, not there yet
2022-10-14 18:17:57 +02:00
177282d79c
Use the more appropriate size_t
2022-10-14 17:33:06 +02:00
5abd8814e3
Kernel: Continue moving utilities to a separate subdirectory
2022-10-14 17:33:06 +02:00
e21b608af4
Utilities: Start moving utilities into specific headers in a utils/ subdirectory
2022-10-14 17:31:47 +02:00
26211bd49f
It (almost) works now
...
The only thing doing weird stuff is exec(), so that's commented out and throws ENOSYS right now.
But we have two user tasks running in parallel, isolated from each other!
2022-10-14 16:46:00 +02:00
5d41b4b113
Almost there...
...
exec() is not working yet. But the rest are!!
2022-10-13 22:13:04 +02:00
24272c57ef
Almost there!
2022-10-13 21:55:51 +02:00
ee712432bd
Some more multiple address space stuff
...
This page-faults. This is because the memory where the ELF should be is all zeroes, which the CPU tries to interpret.
2022-10-13 21:14:39 +02:00
229b06c63b
Add basic address space infrastructure
2022-10-13 19:19:51 +02:00
83e6b8cd21
VMM: Fix naming convention
2022-10-13 18:42:53 +02:00
57482e4e93
VMM: Make it even nicer
2022-10-13 18:15:52 +02:00
b360307f41
VMM: Make it so much gooder
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There are still some fixes to be made, but I think this is already way cleaner than before.
2022-10-13 17:58:13 +02:00
9f2c9fb190
Kernel: Make Utilities be inline
2022-10-13 17:17:28 +02:00
69a9f7f06a
Kernel: Move VMM from a class to a namespace
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Also, rename the ugly Paging::VirtualMemoryManager name to just 'VMM'. Which is now used instead of kernelVMM.
2022-10-12 20:02:25 +02:00
5f8376409d
Kernel, libc: Implement EFAULT
2022-10-12 19:25:35 +02:00
9cddf9485d
ELFLoader: Make check_elf_image return how much memory the executable will use on success
2022-10-12 19:20:14 +02:00
4091799701
Kernel, libc: Add ENOEXEC (Exec format error)
2022-10-12 19:15:44 +02:00
3ac9fed23a
ELFLoader: Add check_elf_image() and check_elf_image_from_filesystem()
...
These two functions validate an image, without actually loading it. Very useful for exec!
2022-10-12 18:37:00 +02:00
261fc73146
ELFLoader: Read the ELF file header by header using the VFS
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Instead of just allocating one big redundant blob of memory and reading into it, then having to free it...
2022-10-12 18:23:52 +02:00
bcbf43e55c
Kernel/std: Add strdup()
2022-10-12 18:03:54 +02:00
f8b3567042
Kernel: Add an exec() syscall
...
Very bare-bones for now. Doesn't support arguments or environment (we don't have that stuff right now), and the executable is not a valid ELF, it terminates the task.
But it's a start!
2022-10-12 17:42:01 +02:00
136c0b3ae9
Scheduler: add a reset_task function
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This can be used later to implement execve()
2022-10-12 17:08:45 +02:00
4e3ef9593d
Scheduler: Move ELF image freeing to ELFLoader
2022-10-12 17:08:17 +02:00
a6f0a7056f
Scheduler: Set the user_task field in a Task at creation time
...
We were previously looking at its segment registers to see if they were user-like, but this method is bad.
What is the task was executing a system call?
So now, we store that value at creation time.
2022-10-12 17:07:39 +02:00
854f585e1a
Kernel: Add a seek() system call
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Now, time for libc support!!
2022-10-12 15:28:52 +02:00
97b7572933
VFS: Implement a new type of Node, VFS_DEVICE
...
This is used to differentiate normal files from devices.
2022-10-12 15:22:34 +02:00
0f5910add7
Kernel/Utilities: Add new round_{up,down}_to_nearest_page functions
2022-10-12 14:51:04 +02:00
66add380cf
Kernel/Utilities: add a new get_top_of_stack convenience function
2022-10-12 13:17:58 +02:00
97eacc027e
Kernel: Use PAGE_SIZE in more places
2022-10-12 13:05:57 +02:00
f5deb1048a
Kernel: Add functions to push and pop the interrupt state
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This can be useful when you want to disable interrupts, but then only enable them back if they were previously enabled.
2022-10-12 12:58:56 +02:00
b3e16068ef
Kernel: Add Utilities::get_rflags(), and thus Interrupts::are_enabled()
2022-10-12 12:56:55 +02:00
96b1d1c2f2
Devices: Tell a device which name you want it to be instantiated with
...
This allows us to create a device in any path, with any filename.
2022-10-12 10:54:46 +02:00
eb03ae91e0
Devices: Add a new Serial device
...
This device permits userspace to interface with the serial port.
2022-10-12 10:44:30 +02:00
d3ac590e24
Kernel: Remove the sys_getversion() syscall
...
User programs can now acquire this information by reading /dev/version.
2022-10-11 21:31:28 +02:00
12cf37d0a7
Kernel/syscalls: Modify sys_write to accept a file descriptor and write to it
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Previously, sys_write only wrote to the tty. Now, it uses the VFS interface, as it should.
2022-10-11 21:06:12 +02:00
e764647133
Devices: add a new ConsoleDevice
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This new device is the userspace interface to the text console/tty.
2022-10-11 21:04:50 +02:00
e67ef7778c
VFS: Support writing to files
2022-10-11 21:03:30 +02:00
04da26bff5
kernel: add a few comments
2022-10-11 19:51:24 +02:00
0131193379
ELFLoader, Scheduler: Transition to use VFS
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We should start to drop the old InitRD API, which only allows for files to be loaded from the initrd, and which forces pathnames to be relative (bin/init)
With VFS, we can load any kind of file from any kind of filesystem, and using paths that make sense (/bin/init)
2022-10-11 19:33:48 +02:00
0a7d4a530d
VFS, DeviceFS: Implement a device filesystem
...
For now, we just have a version device. (this will allow us to get rid of sys_getversion!!)
More should be implemented soon.
2022-10-11 19:21:16 +02:00
4aa3da8c12
VFS: Add basic mount(), unmount() and mkdir() functions (not accessible to userspace yet)
2022-10-11 18:23:00 +02:00
1278cec065
VFS: Add a 'type' flag to Nodes, implement EISDIR
2022-10-11 17:48:11 +02:00
da2ede3450
Kernel, libc, userspace: Implement file descriptors
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Kernel: Implement a descriptor struct which stores the opened node and read offset, and give each task 8 of those.
Implement three syscalls: sys_read, sys_open and sys_close (sys_write still writes to the console instead of using a fd, for now)
Implement three new errors: ENOENT, EBADF and EMFILE.
libc: Implement the new errors, and the new syscalls in syscall().
Also fix _RETURN_WITH_ERRNO() to set errno correctly, which was making strerror() return null, thus crashing perror().
userspace: make init demonstrate the new file API.
2022-10-10 20:21:39 +02:00
63b2de4e3c
Basic FDs
2022-10-10 19:00:24 +02:00
bbe7c6e658
VFS: Implement resolve_path and form the initial ramdisk's VFS properly
...
Finally, resolve_path: a function which takes a path (/etc/fstab for example), and walks the VFS:
In this case, it would start with the root FS node, and ask it: "do you have a directory/file named etc?"
The node could say 'yes', 'no', or 'i'm not a directory, I'm a file' (should not be the case for the VFS root, but for the other ones it could be)
If it says yes, we continue and ask the child if it has a file named fstab. Etc...
2022-10-10 18:44:43 +02:00
2be70d0bc1
VFS: Use 64-bit numbers in read()
...
There is no need for any kind of 32-bit compatibility.
2022-10-09 21:30:38 +02:00
8158ddc94f
VFS: be more verbose
2022-10-09 21:19:22 +02:00
b38c52f8c7
more vfs stuff
2022-10-08 21:35:19 +02:00
f3d7e220ac
The beginnings of a VFS implementation!!
2022-10-08 21:22:46 +02:00
f83a6ace51
Kernel, libc: Add support for providing a status code to exit()
...
The exit() libc function already accepted an integer, but didn't pass it on to the kernel since we had no mechanism for it to do that.
Now, the kernel stores a task's exit status to display it later (and in the future, return it to userspace via wait()/waitpid())
2022-10-08 17:56:40 +02:00
abcf1b6118
Define PAGE_SIZE as 4096 and use it everywhere instead of using 4096 as a magic number
2022-10-08 14:52:28 +02:00
ce6ec3585c
Kernel, libc: Add ENOSYS
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This error is returned by the kernel/C Library when an attempt is made to use a system call that doesn't exist.
2022-10-08 14:18:25 +02:00
a086ec514b
Remove the Superblock.h file which has never been used.
...
This file was included for a future Ext2 implementation. It should be included when said Ext2 implementation is actually started.
2022-10-08 13:28:30 +02:00
71e15e94af
Kernel, libc and userspace: Add basic errno support.
...
Kernel: Add an errno.h header with definitions for each header,
and return those, negated, from syscalls when there is an error.
mmap() returns an invalid address with errno encoded, instead of
returning a negated errno; this address is encoded as ffffffffffffffEE
where EE is errno in hex.
libc: make syscall() return -1 and set errno on error, instead of
returning the raw return value of the system call. Also, add mmap()
and munmap() wrappers in sys/mman.h :).
userspace: make the memeater program show the value of errno
when allocating memory fails.
Things to improve: add perror() and strerror() to make the errno
experience even better! >.<
2022-10-08 12:06:09 +02:00
dc389da74e
Implement an ELFImage struct
...
This struct allows us to keep track of what memory is used by the loaded executable. For some reason, freeing this memory when the task exits triggers a kernel page fault, so I'm not doing that right now.
2022-10-07 17:54:05 +02:00
594d79143e
Kernel: enable -Wconversion
2022-10-06 17:13:34 +02:00
952d8fa294
Be more strict with warnings
2022-10-05 17:34:22 +02:00
8f310dd307
PMM: Map the page bitmap to kernel heap once the PMM and VMM are both initialized
2022-10-04 18:36:09 +02:00
dae2ff8d50
Add mmap and munmap syscalls, and thus, add malloc and free to libc!! (yet again, thanks to the wonderful liballoc)
2022-10-02 20:45:04 +02:00
1ecd24f5d6
Kernel: Add SSE support (enable SSE on boot and save context (user tasks only) on task switch)
2022-10-02 18:53:54 +02:00
8e6741ebd6
Rename SYS_version to SYS_getversion
2022-10-02 17:25:56 +02:00
ac6fdce737
Add 2 new syscalls (sys_version, sys_gettid)
2022-10-01 17:30:31 +02:00
87cb41e549
Separate the logging stack into toggleable backends, to disable console logging once boot finishes.
2022-10-01 15:35:11 +02:00
