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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>
2021-10-09arch: i386: include more information in IDTDanny Holman4-73/+129
Include information about the current stack frame in the IDT handler(s). Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-09-28arch: i386: add PIC register supportDanny Holman2-0/+19
Add functions that let the OS read the internal state registers of the 8259 PIC. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-09-28arch: i386: fix IDT exception handlerDanny Holman4-45/+145
Fix the i386's general exception handler to actually work. Fix provided by Jon Sanderson (jjs295356@gmail.com). Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-09-28arch: i386: fix GDT segment mismatchDanny Holman1-1/+1
Fix a bug in which the size of the main GDT array and the actual number of descriptors are different values. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-09-28arch: i386: add support for 8259 PICDanny Holman6-18/+102
Add support for the 8259 programmable interrupt controller. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-08-30i386: create idt.c and isr.sDanny Holman4-1/+117
Create files that add IDT support for i386. Signed-off-by: Danny Holman <dholman@gymli.xyz>
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