108e04a8f0
Page fault handler now allocates new page tables
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Rather than contantly checking if a page table exists before access, the fault handler will automatically allocate them as needed.
2023-11-07 12:44:23 -06:00
091830e508
Added constructor to x86 context
2023-11-07 12:37:33 -06:00
a5ce86147d
Created small static library to wrap system call ABI
2023-09-07 00:58:57 -05:00
e258bfcc9f
Moved kernel base 4MiB lower
2023-09-07 00:56:40 -05:00
5cf5edd589
Rewrote heap.c to use libmalloc
2023-03-03 04:55:31 -06:00
14415fae9f
set_pte_type now correctly sets flags
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Previously it erroneously set all flags regardless to `flags` argument
2023-03-03 04:54:54 -06:00
035960f4d3
Added new linker symbol pointing to end of read-only data
2023-03-03 04:52:58 -06:00
f8cfca588e
Fixed inline assembly constraints in msr.c
2023-03-03 04:51:20 -06:00
60775ee007
x86 putc() now copies chars to COM1
2023-01-10 05:37:14 -06:00
6af84b247f
Page allocation uses new external library, libmalloc
2023-01-09 01:56:09 -06:00
c069866bc7
Buncha changes and fixes
2022-12-30 17:11:42 -06:00
166841da51
Added usermode interrupt handling
2022-12-21 11:37:13 -06:00
bacedbea86
Rewrote physical memory allocator
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The physical memory allocator now uses a buddy allocator instead of a stack.
Also moved some of the platform-independent context code to kernel.c.
2022-08-23 13:00:26 -05:00
c36f65ce97
Various renaming and refactoring
2022-08-19 22:34:45 -05:00
0ae4f7995d
Added basic IPC syscalls
2022-08-17 02:47:41 -05:00
bfb56fcbb3
Added functions to portably manipulate process context
2022-08-17 01:41:59 -05:00
958b717751
Fixed state save after process preemption
2022-07-05 15:19:20 -05:00
5c7d002bbf
Moved PCB for each process to kernel heap
2022-07-03 13:17:06 -05:00
a52f06f81e
Massive backlog of changes
2022-06-15 15:59:31 -05:00
c962a83ff0
WIP on kernel syscalls
2021-05-01 17:09:50 -05:00
7caf49065d
page stack constructor takes stack base as argument
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initialize() calls new constructors and fills in syscall table
2021-04-19 06:58:02 -05:00
8605f08405
Changed DPL of syscall interrupt to 3
2021-04-19 06:57:05 -05:00
a68503538b
putc() advances lines when screen is full
2021-04-19 06:56:49 -05:00
470e39e8e8
Added support for page types in mmgr
2021-04-19 06:55:27 -05:00
755f2a3d69
Wrote syscall interrupt handler in assembly
2021-04-19 06:53:39 -05:00
5efc389935
Finished basic task switching mechansim
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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
40da57e233
APIC enabled after running kernel state constructors
2021-04-18 02:10:56 -05:00
c39cbb79cd
Task contexts now load segment registers correctly
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Interrupt enable bit set in saved EFLAGS register
2021-04-18 02:10:03 -05:00
1171aa2ca3
Spurious interrupt vector set to 0xFF
2021-04-18 02:07:45 -05:00
0b84658a61
TSS is created and TR loaded in initialize_gdt()
2021-04-18 02:07:00 -05:00
b615a8d286
More process in initialize()
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Function now constructs kernel state and enters a process
2021-04-17 06:27:55 -05:00
461194fdfd
Fixed initialize_context()
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Function did not take 'popal' instruction into account when initializing stack
2021-04-17 06:26:56 -05:00
7c0c5cd8ce
Fixed calculation of kernel binary size in initialize()
2021-04-17 04:57:12 -05:00
55c5db056e
Fixed crash in initialize_context()
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Function tried to dereference a physical address, causing page fault
2021-04-17 04:56:22 -05:00
5c4a756176
Fixed fatal error while loading modules
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strcpy() was called with a char instead of a char*, obviously causing a crash
2021-04-17 04:24:23 -05:00
961139df9e
Improved kernel memory usage
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Moved base linear address to 0xFF800000
Kernel only reserves the page frames it actually needs
Memory for multiboot2 headers is freed
Video memory and APIC registers are dynamically mapped into linear addresses
2021-04-17 03:45:45 -05:00
b582c39ff8
Started work on process management
2021-04-17 01:00:28 -05:00
ce6371f0c3
Added ISR for preemption of processes
2021-04-17 00:59:15 -05:00
2d6fa0d163
Added functions to create and load process contexts
2021-04-17 00:55:05 -05:00
fdcdb9acab
Updated virtual memory manager
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Added page flags
Added function current_address_space()
Fixed create_address_space()
Renamed some fields in page_table_entry_t to fit naming scheme
2021-04-17 00:52:16 -05:00
6138766c49
Added sequence to remap PIC
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Wrote GDT code in C
Added routines to initialize GDT and IDT
2021-04-16 01:45:40 -05:00
8e6589b472
Added some test code to setup a timer
2021-04-15 07:23:19 -05:00
3e73c7c0ac
Fixed APIC register mapping
2021-04-15 07:22:58 -05:00
0c5d18ddc0
Added enum for timer interrupt vector
2021-04-15 07:22:26 -05:00
50fcaa2673
Added timer ISR
2021-04-15 07:22:01 -05:00
3229f55164
Added some code in initialize() to test interrupts
2021-04-15 05:49:40 -05:00
c5e38801f3
Fixed the idt_info_t struct and lidt()
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Info was not loaded properly, causing crash
2021-04-15 05:49:11 -05:00
923057ee1c
Removed 'interrupt' attribute from isr_ap_start()
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Added message to division by 0 exception
2021-04-15 04:55:28 -05:00
ac0e5261ba
Implemented apic_send_ipi()
2021-04-15 04:51:57 -05:00
d2617e4488
Wrote new ISR for AP entry
2021-04-15 04:51:23 -05:00
