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Author SHA1 Message Date
ngiddings
21509be9bc Added 'math.c' for optimized math and bit operations 2022-08-23 08:41:53 -05:00
ngiddings
c36f65ce97 Various renaming and refactoring 2022-08-19 22:34:45 -05:00
ngiddings
0337fca749 Moved syscall IDs to separate header 2022-08-19 06:06:48 -05:00
ngiddings
164fb9fcae Added simple IPC syscalls 2022-08-19 03:56:53 -05:00
Nathan Giddings
9c82a39097 Merge pull request #8 from ngiddings/master 
Merge latest work
 2022-08-17 18:25:25 -05:00
ngiddings
0ae4f7995d Added basic IPC syscalls 2022-08-17 02:47:41 -05:00
ngiddings
bfb56fcbb3 Added functions to portably manipulate process context 2022-08-17 01:41:59 -05:00
ngiddings
bbf2325a60 Added constructor to queue 2022-08-17 01:41:19 -05:00
ngiddings
5b959c9763 Added queue structure 2022-08-15 20:20:31 -05:00
Nathan Giddings
bdb0b753a3 Fixed multiple definition error 2022-07-23 04:03:00 -05:00
ngiddings
03968c33eb Redefined message struct 2022-07-23 02:22:18 -05:00
ngiddings
d84c9c86d0 Removed some unused code 2022-07-05 18:06:19 -05:00
ngiddings
958b717751 Fixed state save after process preemption 2022-07-05 15:19:20 -05:00
ngiddings
d4b36a7c7d Return the previous process to queue after context switch 2022-07-05 15:18:51 -05:00
ngiddings
5c7d002bbf Moved PCB for each process to kernel heap 2022-07-03 13:17:06 -05:00
ngiddings
e3026b2601 Removed unneeded #include from elf.h 2022-06-15 16:07:01 -05:00
ngiddings
38d9ee4737 Removed unneeded #include from heap.h 2022-06-15 16:05:40 -05:00
Nathan Giddings
da04d019c6 Merge pull request #7 from ngiddings/pre-alpha 
Latest development on pre-alpha
 2022-06-15 16:03:06 -05:00
ngiddings
a52f06f81e Massive backlog of changes 2022-06-15 15:59:31 -05:00
ngiddings
c962a83ff0 WIP on kernel syscalls 2021-05-01 17:09:50 -05:00
ngiddings
7caf49065d page stack constructor takes stack base as argument 
initialize() calls new constructors and fills in syscall table
 2021-04-19 06:58:02 -05:00
ngiddings
8605f08405 Changed DPL of syscall interrupt to 3 2021-04-19 06:57:05 -05:00
ngiddings
a68503538b putc() advances lines when screen is full 2021-04-19 06:56:49 -05:00
ngiddings
c5ca5e82a7 Added more status codes 2021-04-19 06:56:12 -05:00
ngiddings
7300b9ecd6 Fixed broken ELF loader 
Only binaries less than a page long would load correctly.
 2021-04-19 06:56:03 -05:00
ngiddings
470e39e8e8 Added support for page types in mmgr 2021-04-19 06:55:27 -05:00
ngiddings
a5e9d852ab Implemented do_syscall() 
Wrote constructor for kernel state
Added syscall table
 2021-04-19 06:54:34 -05:00
ngiddings
755f2a3d69 Wrote syscall interrupt handler in assembly 2021-04-19 06:53:39 -05:00
ngiddings
0af53bcfc8 Moved config.h to include/ 2021-04-19 06:52:02 -05:00
ngiddings
6df3f203b8 Added source file for syscalls 2021-04-19 06:51:48 -05:00
Nathan Giddings
6b73aff3d0 Merge pull request #6 from ngiddings/pre-alpha 
Pre alpha
 2021-04-19 03:42:05 -05:00
ngiddings
5efc389935 Finished basic task switching mechansim 
PCB is local to a process's address space.
Context switches are written in assembly.
Moved x86 headers to include/x86
 2021-04-19 03:40:33 -05:00
ngiddings
086dfe546a GRUB config file loads modules at boot 2021-04-18 08:00:56 -05:00
ngiddings
40da57e233 APIC enabled after running kernel state constructors 2021-04-18 02:10:56 -05:00
ngiddings
625bbb04a8 Debug message printed before loading task context 2021-04-18 02:10:33 -05:00
ngiddings
c39cbb79cd Task contexts now load segment registers correctly 
Interrupt enable bit set in saved EFLAGS register
 2021-04-18 02:10:03 -05:00
ngiddings
1171aa2ca3 Spurious interrupt vector set to 0xFF 2021-04-18 02:07:45 -05:00
ngiddings
0b84658a61 TSS is created and TR loaded in initialize_gdt() 2021-04-18 02:07:00 -05:00
ngiddings
979344e942 next_process() checks if a next process exists 
Panics if not
 2021-04-17 06:30:00 -05:00
ngiddings
b615a8d286 More process in initialize() 
Function now constructs kernel state and enters a process
 2021-04-17 06:27:55 -05:00
ngiddings
461194fdfd Fixed initialize_context() 
Function did not take 'popal' instruction into account when initializing stack
 2021-04-17 06:26:56 -05:00
ngiddings
a68a4dff11 Added new 'null pointer' status code 2021-04-17 06:26:03 -05:00
ngiddings
7dd19d0c2a Added constructors for heap and resource table 2021-04-17 06:25:46 -05:00
ngiddings
291ed65248 Fixed wrong pointer type in load_module() 
Kernel passed a pointer to its own state to get_free_resource_slot(),
causing its state to be corrupted.
next_process() also now loads the address space of the next process before entering it.
 2021-04-17 06:25:11 -05:00
ngiddings
2a5dcd4a0f Improved get_free_resource_slot() 
Table now tries to expand itself when no available slots are left
 2021-04-17 04:59:39 -05:00
ngiddings
a28e586139 Fixed missing return in free_page() 
Method would report "out of memory" when that was not the case
 2021-04-17 04:58:02 -05:00
ngiddings
7c0c5cd8ce Fixed calculation of kernel binary size in initialize() 2021-04-17 04:57:12 -05:00
ngiddings
55c5db056e Fixed crash in initialize_context() 
Function tried to dereference a physical address, causing page fault
 2021-04-17 04:56:22 -05:00
ngiddings
5c4a756176 Fixed fatal error while loading modules 
strcpy() was called with a char instead of a char*, obviously causing a crash
 2021-04-17 04:24:23 -05:00
Nathan Giddings
d0f9d026cc Merge pull request #5 from ngiddings/pre-alpha 
Pre alpha
 2021-04-17 03:46:34 -05:00