207 Commits

Author	SHA1	Message	Date
apio	84c1ac4cee	kernel: Add msync	2023-08-02 22:39:07 +02:00
apio	2572695c8d	kernel: Support mapping shared memory using mmap()	2023-08-02 22:20:05 +02:00
apio	9443551d71	kernel: Add shared memory	2023-08-02 22:20:05 +02:00
apio	ae0cd155c3	kernel: Fix AddressSpace's move assignment operator	2023-07-09 20:43:03 +02:00
apio	c599251d2a	kernel: Rename UserVM to AddressSpace ... This is a more appropriate name now that it does more stuff than allocate virtual memory. To be fair, the name was a bit awkward anyway. Should have been UserVMAllocator I guess.	2023-07-09 20:38:04 +02:00
apio	5e564e9ae3	kernel: Move Thread::self_directory to UserVM ... Since this is only used by user threads, UserVM is a convenient/related place to store the PageDirectory in a RAII manner.	2023-07-09 20:32:42 +02:00
apio	af26dce038	kernel: Zero physical frames instead of virtual pages ... The memset() happens a bit earlier, and we don't have to remap the mapped virtual memory.	2023-07-04 00:49:26 +02:00
apio	bd757d204e	kernel+libos+libluna: Avoid copying and reallocation when creating Strings ... This is done by reusing the existing buffers in Vector and Buffer instances.	2023-07-02 19:30:25 +02:00
apio	3d157b760c	kernel: Make the stack and loaded program code regions persistent ... This way, they can't be modified by mmap() or munmap().	2023-06-19 12:44:49 +02:00
apio	3a3473b9c2	kernel: Use memcpy() when cloning UserVM ... This way, any future fields in VMRegion get copied automatically.	2023-06-18 01:54:29 +02:00
apio	67ed18629d	kernel: Update the VM allocator for userspace to use a linked list ... This can cover the entire address space at once in a more memory-efficient way. Stress-tested using 'base64 /bin/ls' which allocates enough contiguous virtual memory to store the entirety of /bin/ls :) A couple of bugs and fixes later, here we are!	2023-06-18 01:48:48 +02:00
apio	7cace9a0d7	kernel: Provide more meaningful panic messages for critical failures	2023-06-17 19:43:25 +02:00
apio	9bab4c62a1	kernel: Compilation fixes	2023-05-07 21:42:03 +02:00
apio	72dadc6706	kernel: Define a constant to check for default memory access	2023-05-07 21:38:38 +02:00
apio	b25e212880	kernel: Make a generic function for checking memory flags	2023-05-07 21:37:01 +02:00
apio	95659639e5	kernel: Zero out allocated memory for userspace to avoid leaking sensitive data	2023-04-17 20:11:07 +02:00
apio	df95126ccd	kernel: Remove unneeded debug logs & random cleanups	2023-04-14 21:10:38 +02:00
apio	1f0e185904	kernel: Use try_set_value(_or_error) in various places	2023-04-07 10:55:04 +02:00
apio	01813ff0dd	String: Rename from_string_literal to from_cstring	2023-03-29 17:34:30 +02:00
apio	b6c35124d6	libluna: OwnedStringView -> String ... Also with inline storage!	2023-03-29 17:28:22 +02:00
apio	54f2d35416	kernel: Add the fork() system call	2023-03-18 23:45:48 +01:00
apio	b9e8030aac	kernel: Free the initial ramdisk memory after copying everything into the VFS	2023-03-16 23:02:53 +01:00
apio	08c888eaae	kernel+libc: Remove (de)allocate_memory and replace it with POSIX mmap	2023-03-14 20:43:15 +01:00
apio	02dbcbbfa1	kernel: Add strdup_from_user()	2023-03-12 16:30:36 +01:00
apio	f0a3f99cf9	MemoryManager: Initialize KernelVM at the end of init() ... KernelVM is not needed for MMU's init process anymore.	2023-02-27 13:24:58 +01:00
apio	752dfdbf1c	MemoryManager: Reuse the existing mapping of physical memory that MMU has	2023-02-27 12:51:29 +01:00
apio	8df441064f	x86_64/MMU: Map the physical address space using huge pages	2023-02-27 12:47:17 +01:00
apio	426f6e4da8	x86_64: Allow mapping huge pages, but don't do it yet	2023-02-27 12:41:28 +01:00
apio	794567327f	kernel, luna: Port non-VFS changes over from pull request #22 ... OwnedPtr, SharedPtr: Add operator bool Option, Result: Make try_move_value() non-const since it modifies the Option kernel: Switch to a stack we control for the main task as soon as we leave early boot Heap: Fix GPF caused when making many small allocations Heap: Avoid accessing a block after it's potentially deleted luna: Skip UBSAN.cpp in CMakeLists as that's not implemented yet luna: Use spinlocks in the heap implementation kernel, luna: Move Spinlock.h to luna Option: Use __builtin_launder to ensure that the compiler doesn't label this as UB SharedPtr: Implement make_shared using adopt_shared SharedPtr: Delete ptr on failure in all adopt_shared* functions	2023-02-25 17:09:03 +01:00
apio	fd0e29ede5	kernel: Add FIXME in copy_to_user()/copy_from_user()	2023-01-25 21:22:14 +01:00
apio	a7a38d3433	Bitmap: Add a fallible variant of match_region() that does not crash if arguments are out of range ... This lets us call deallocate_memory() with any address and it will not crash.	2023-01-22 14:25:51 +01:00
apio	944d32de36	Bitmap: Introduce new malloc-aware initialization functions ... Lets us call resize(new_size) instead of initialize(realloc(location, new_size), new_size)	2023-01-21 23:16:50 +01:00
apio	a3d0fa7d0a	UserVM: Validate the entire range when freeing multiple VM pages	2023-01-16 21:16:38 +01:00
apio	1d92784608	luna, kernel: Replace some uses of char by truly 1-byte wide types	2023-01-16 19:52:34 +01:00
apio	5fb2ff09c7	kernel, luna, libc: Move the heap code to a common zone, to be used by both kernel and userspace	2023-01-13 19:27:53 +01:00
apio	139c0b5eb1	Kernel: Make a UserVM wrapper around Bitmap and use that to allocate user VM ... This lets us allocate more than one page of memory from the user side.	2023-01-13 19:05:20 +01:00
apio	79a5b98d65	Kernel: Keep the user pointer const through copy_from_user()	2023-01-11 19:26:53 +01:00
apio	6e4cd6300d	Kernel: Add copy_from_user() and copy_from_user_typed()	2023-01-11 19:25:28 +01:00
apio	84c82a4e75	luna, kernel: More constness	2023-01-10 19:31:41 +01:00
apio	c83f6c03b5	Bitmap: Add a 'find_and_toggle' method ... Just like find(), but toggles the value when finding it. Avoids doing this manually in MemoryManager and KernelVM.	2023-01-09 18:08:50 +01:00
apio	4287ec6cb0	Bitmap: Introduce a new method 'find' and use it in MM and KernelVM ... This method looks for the first bit with a value, optionally from a starting index, and returns its index. This should be (haven't benchmarked) way faster than the manual way, AKA what MM and KernelVM were doing. This is due to this method using bit and byte manipulation tricks instead of just calling get() until getting the desired result :)	2023-01-09 17:59:52 +01:00
apio	0c73d69a70	Kernel: Fix shadow 12GiB reserved entry when running QEMU without KVM on ... Fix inspired by: https://github.com/serenityos/serenity/pull/16345	2023-01-07 20:58:12 +01:00
apio	fde1727218	KernelVM: Expand the available VM range	2023-01-07 12:33:00 +01:00
apio	29bd8a69fa	MemoryManager: Add helper functions to validate arbitrary ranges of userspace memory	2023-01-07 01:39:33 +01:00
apio	6e9b4491a6	MemoryManager: Add copy_to_user() and copy_to_user_typed()	2023-01-07 00:17:16 +01:00
apio	caa3fe8c45	MemoryManager: Add validate_userspace_string() ... A bit crude, should be replaced by a strdup_from_user() helper to avoid touching userspace memory directly. But it'll do for now.	2023-01-05 22:39:09 +01:00
apio	c53bba0392	MemoryManager: Add an unmap_weak_and_free_vm() helper function ... This function mirrors unmap_owned_and_free_vm(), but using weak unmapping (does not free the underlying physical memory)	2023-01-05 21:50:06 +01:00
apio	5854e5e530	Add newlines at end-of-file	2023-01-02 13:07:29 +01:00
apio	4081186b27	Heap: Rewrite kmalloc to use Option<HeapBlock*> instead of nullable pointers to iterate over the heap ... At some point, this should be done inside LinkedList itself, but we have no such thing as break in for_each(). It's iterate over everything or nothing. This also requires operator= in Option, might be also added to Result in the future.	2022-12-30 19:02:25 +01:00
apio	ed34009b50	Heap: Log more details of blocks	2022-12-26 16:17:24 +01:00