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2023-11-26arch: i386: gdt.c: init the TSS before loading itDanny Holman
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 Holman
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 Holman
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 Holman
Fix several small bugs in assembler. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-03-22arch: i386: make serial_writestring inlineDanny Holman
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 Holman
The x86 system call/interrupt handlers should be refactored to be more readable. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-03-22Makefile: explicitly define CC variableDanny Holman
The CC variable is already defined by the make program, so use "CC:=" instead of "CC?=". This makes sure the proper cross compiler is in use. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-01-21arch: i386: move non-critial files out of bootDanny Holman
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 Holman
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 Holman
Add support for rudementary system calls and IRQ interrupts. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-01-15arch: i386: simplifiy GDT setupDanny Holman
Simplify the setup and definitions of GDT/TSS entries. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-01-15Makefile: add dry run and debug targetsDanny Holman
Add targets to perform a test run and debug run inside a VM. Signed-off-by: Danny Holman <dholman@gymli.org>
2022-01-15arch: i386: simplify IDT setupDanny Holman
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 Holman
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 Holman
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 Holman
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 Holman
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 Holman
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 Holman
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 Holman
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 Holman
Create files that add IDT support for i386. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-08-30git: stop ignoring assembly filesDanny Holman
Remove the '*.s' line from .gitignore. There are important assembler files that should be in a distribution. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-08-30doc: add the Developer's Certificate of OriginDanny Holman
Add the Developer's Certificate of Origin to the documentation directory. This allows developers to keep their own copyright. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-08-27arch: i386: add ring-3 descriptors to the GDTDanny Holman
Add two ring-3 segment discriptors to the GDT during gdt_install. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-07-25arch: i386: surround GDT macros with parensDanny Holman
Add parenthesis around the GDT setup macros. This is done to prevent having to do it when using them. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-07-24arch: i386: add GDT setup routinesDanny Holman
Add a set of routines that setup the x86's global descriptor table. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-07-20arch: i386: move the kernel to high memoryDanny Holman
Move the start of the kernel image to the "higher half" of memory. This also enables paging.
2021-07-20io: prefix a 'k' to print functionsDanny Holman
Add a 'k' prefix to the kernel versions of the printf family.
2021-06-04Makefile: clean up targetsDanny Holman
Clean up the Makefile to be more clear and readable. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-03-09Makefile: include dependency filesDanny Holman
Add an include directive in the main Makefile that includes the dependency files generated by GCC. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-03-09README: fix improper formattingDanny Holman
Fix wrong formatting in the project README file. Lists should have an empty line proceeding them, otherwise the first element is italicized. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-03-09Makefile: fix wrong -I directive to compilerDanny Holman
Fix a bug in which the architecture specific include directories are not properly included in the main Makefile. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-28README: add project README fileDanny Holman
Add a README to the root of the project. This will act as a point of information to new users/developers. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-28i386: create terminal_scroll functionDanny Holman
Add support for scrolling the terminal at the end of the VGA buffer. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-25i386: add support for newlinesDanny Holman
Add support for the newline character in the TTY layer. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-24x86: reorganize the i386 directoryDanny Holman
Add structure to the internals of the x86 directory. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-20serial: add serial_writestring as a functionDanny Holman
Add a function in the serial interface that writes an entire string to the serial line. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-20kernel: iterate over string with indexDanny Holman
Iterate over a formatted string with an index and strlen instead of using a non-const pointer. The latter method may result in unsafe memory conditions. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-20kernel: maintain const on stringsDanny Holman
Keep const pointers const when casting from void to char. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-20serial: don't declare serial_init as staticDanny Holman
The function serial_init should not be declared as static. This function could change under a different architecture and should be defined with the target architecture. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-20i386: add serial port supportDanny Holman
Add support for serial communication in the i386 architecture. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-20include: append "_H" to include guardsDanny Holman
Add a "_H" to the end of the include guards in tty.h. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-18kernel: finish implementing string functionsDanny Holman
Finish implementing the functions from string.h in string.c. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-17include: remove an include to the tty layer in ioDanny Holman
Remove the include to the tty layer in io.h. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-17kernel: implement a basic printf functionDanny Holman
Implement a basic printf function using primitives from the TTY library. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-17kernel: add main initialization functionsDanny Holman
Add the main initialiazation functions within the main kernel directory. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-17kernel: add string.h implementationsDanny Holman
Add implementations for functions declared in string.h. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-17arch: i386: add support for x86 processorsDanny Holman
Add support for 32-bit x86 processors, i.e. the 80386 and above. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-17include: create basic C library functionsDanny Holman
Create the basic C library functions for use inside the kernel. Signed-off-by: Danny Holman <dholman@gymli.xyz>
2021-01-17Initial commitDanny Holman
Signed-off-by: Danny Holman <dholman@gymli.xyz>
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