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2024-03-28kernel: add a basic thread schedulerDanny Holman2-0/+30
Add a basic thread scheduler. This should allow the kernel to schedule threads according to the round robin algorithm. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-03-28arch: i386: kernel: implement a kmalloc functionDanny Holman2-0/+67
Add a basic kmalloc implementation. This allows the kernel to allocate blocks smaller than a whole page. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-03-28arch: i386: kernel: add mostly finished PFA and paging systemDanny Holman10-65/+216
Add the mostly finished physical memory allocator and expose its functions to the paging system. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-24kernel: string: add a strcpy functionDanny Holman2-11/+6
Add an implmentation of strcpy. This function is used in several places in the kernel to copy strings between memory addresses. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-24arch: i386: cleanup everything and reorganizeDanny Holman17-225/+192
Clean up everything in the i386 arch directory. This code has been in dire need of refactoring for a long while. All the inline assembly functions and the data structures related to the architecture should be placed into their own header file. Now the scheduler can access registers and ISRs without having to deal with arch-specific code. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-24arch: i386: move jump_userspace to its own fileDanny Holman2-18/+30
Move the function that jumps to ring 3 to its own assembly file. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: add basic keyboard driverDanny Holman3-0/+176
Add a basic driver for the PS/2 keyboard. This driver just prints whatever it receives back out to the framebuffer. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: roll physical memory control into VMMDanny Holman6-132/+107
The VMM should control the physical memory as well as paging. This allows the VMM to grab frames as it sees fit. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: move GDT definitions to their own headerDanny Holman1-0/+55
Move all the data structures required for operation of the GDT to their own header file. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: multiboot: move arch-specific inits hereDanny Holman1-13/+33
Move all the architecture-specific initialization calls to this file. This frees up the main function to initialize other parts of the kernel. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: move IRQ functions to PIC driverDanny Holman3-18/+39
Move all the functions that control IRQ lines to the PIC driver. This allows the IDT controller to handle only raw interrupts no matter where they come from. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: move raw assembly calls to their own headerDanny Holman2-13/+19
Move simple assembly calls to their own header. All one or two line assembly calls should be defined in a single place. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: syscall.c: add functions that dump dataDanny Holman2-1/+9
Add functions to the syscall handlers that dump registers and stack in case of catastrophic failure. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: gdt.c: fix a bug in userspace jumpDanny Holman1-52/+12
Fix a bug in the GDT that prevented the kernel from jumping to userspace correctly. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: boot: ISR frame should not include ESPDanny Holman1-2/+6
The code that constructs an isr_frame struct should not push ESP to the stack. In addition, the kernel should set its own copy of ESP into a function defined elsewhere for scheduling purposes. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: add operations to control PIT timerDanny Holman2-0/+38
Add a set of functions that control the programmable interrupt timer. This will be used as the primary means of preemption on this architecture. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: put framebuffer ops in own fileDanny Holman3-88/+122
Move all operations related to the x86 framebuffer into its own set of files. This makes the TTY layer more architecture agnostic. Signed-off-by: Danny Holman <dholman@gymli.org>
2024-02-16arch: i386: kernel: the serial driver should be more POSIX-yDanny Holman1-13/+13
Make the serial driver behave more like a standard POSIX call. It should have write and read functions that call architecture specific functions. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: alloc: remove erroneous halt instructionDanny Holman1-1/+0
Remove an inline assembly instruction that was placed for debugging purposes. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: make: add source filesv0.05Danny Holman1-0/+3
Add new source files to the x86 architecture build configuration. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: linker.ld: add references to the bitmapDanny Holman1-0/+5
Add references to the PMM bitmap to the linker script. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: paging: add a proper paging APIDanny Holman2-0/+140
Add a proper page control API. These functions allow the kernel to directly map and unmap pages in the logical address space. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: alloc: add a physical memory managerDanny Holman2-0/+56
Add a simple, bitmap-based physical memory management system. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: add multiboot supportDanny Holman2-0/+127
Add support for the multiboot specification. These files will allow the kernel to read the multiboot header information as well as the provided memory map. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: tty.c: remove unneeded local variableDanny Holman1-3/+4
Remove an unused local variable from tty_putchar. Instead, just cast the signed char to unsigned as needed. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: syscall.c: replace function calls with single switchDanny Holman1-21/+9
Replace individual function calls with a single switch-case structure for system calls. The new function, handle_syscall, will construct and call the interrupt without input from the programmer. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: pic.c: finish implementing functions from pic.hDanny Holman1-1/+3
Finish implementing pic_eoi and similar. This allows standardized communication with the x86 PIC chip. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: syscall.h: define some example system callsDanny Holman1-5/+22
Define a few standard Unix system calls. These may change based on future needs. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: pic.h: make register_irq_handler accessibleDanny Holman1-0/+2
Make the register_irq_function accessible from files including pic.h. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: pic.h: change all chars into uint8_tDanny Holman1-1/+2
Make all variables with char or char* type into uint8_t. This makes the system more consistent and issues fewer compiler warnings. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: idt.h: remove extern functionsDanny Holman1-4/+1
Remove references to extern functions. All the necessary functionality for this file is already contained. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: isr.s: create the irq stubsDanny Holman1-3/+21
Create the ISR stubs for use by IRQ handlers. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: idt.c: install the ISR handlersDanny Holman1-47/+62
Actually install the ISR handlers to the IDT. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: idt.c: remove the irq number from handlerDanny Holman1-1/+2
Remove the irq number from the irq handler. This information is already stored in the ISR frame structure. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: idt.c: call the page fault handlerDanny Holman1-3/+1
Call the page fault handler when a page fault occurs instead of just dumping the registers and halting. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: idt.c: add a stopgap to halt_catch_fireDanny Holman1-0/+1
Add a infinite while loop just in case the "hlt" instruction fails. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: idt.c: remove unneeded define macrosDanny Holman1-23/+1
Remove several preprocessor macros that serve no purpose and pollute the source file. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: gdt.c: init the TSS before loading itDanny Holman1-2/+5
Perform some initialization routines on the TSS structure before loading its address. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: boot.s: define functions for page managementDanny Holman1-0/+27
Define the load_page_dir and enable_paging functions in assembly. This allows normal C code to initialize the CR3 register and control paging without using inline assembler. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: boot.s: move C entry point to fileDanny Holman1-10/+3
Move the initial C entry-point to its own file. Call all the i386 specific initialization routines from the new i386_entry function. Signed-off-by: Danny Holman <dholman@gymli.org>
2023-11-26arch: i386: boot: boot.sDanny Holman1-8/+4
Fix several small bugs in assembler. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-03-22arch: i386: make serial_writestring inlineDanny Holman2-19/+8
The serial_writestring function is small enough and platform-agnostic, and therefore it should be moved into the main serial header and marked as inline. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-03-22arch: i386: refactor the system call APIDanny Holman5-11/+4
The x86 system call/interrupt handlers should be refactored to be more readable. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-01-21arch: i386: move non-critial files out of bootDanny Holman9-91/+52
Move all files not needed for the bootstrap process out of boot and into the main x86 source directory. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-01-15arch: i386: fix coding style issueDanny Holman1-2/+2
Make the inline assembly calls consistent across different i386 files. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-01-15arch: i386: add support for IRQs and system callsDanny Holman7-3/+61
Add support for rudementary system calls and IRQ interrupts. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-01-15arch: i386: simplifiy GDT setupDanny Holman4-68/+176
Simplify the setup and definitions of GDT/TSS entries. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-01-15arch: i386: simplify IDT setupDanny Holman5-31/+128
Simplify the interrupt descriptor table setup and frame assembly. Signed-off-by: Danny Holman <dholman@gymli.org>
2021-11-29arch: i386: add support for tab charactersDanny Holman1-0/+10
Add support for the tab character in the virtual terminal. Signed-off-by: Danny Holman <dholman@gymli.org>
2021-10-09arch: i386: rename the GDT array pointerDanny Holman1-7/+7
Rename the array/pointer to the GDT array in gdt.c pointer to be a bit clearer. Signed-off-by: Danny Holman <dholman@gymli.xyz>
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