Sync/kernel/kernel.c

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/************************
*** Team Kitty, 2019 ***
*** Sync ***
***********************/
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/* This file contains the entry point
* to the kernel. This section consists
* mainly of bootloading functions.
*
* Graphics and memory will be setup
* at later stages.
*/
//#include <stdio.h>
#include <kernel.h>
#include <kernel/tty.h>
#include <kernel/serial.h>
#include <kernel/descriptor_tables.h>
void gdb_end() {} /* GDB Debugging stump */
int kernel_main(void) {
/* The kernel is started in 32-bit protected mode by the ASM. */
/* Here, we start by enabling the screen, then loading a GDT and IDT into the actual places they need to be. */
/* Black the screen out. */
screen_initialize();
/* Prepare the serial line for our debug output. */
init_serial();
serial_print(0x3F8, "[INFO] Serial ready.\r\n");
serial_print(0x3F8, "[INFO] Beginning GDT subroutine.\r\n");
/* term_writes: writes a string to the terminal. */
term_writes("GDT...");
/* Prepares the Global Descriptor Table, called from gdt.c */
gdt_install();
/* puts: writes a line to the terminal. */
puts("GDT Ready.");
serial_print(0x3F8, "[INFO] GDT subroutine complete.\r\n");
/* Prepare the Interrupt Descriptor Table. */
serial_print(0x3F8, "[INFO] Beginning IDT subroutine.\r\n");
term_writes("IDT...");
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idt_install();
puts("IDT Ready.");
serial_print(0x3F8, "[INFO] IDT subroutine complete.\r\n[INFO] Enabling interrupts.\r\n");
gdb_end(); /* The first important step. Waypoint it for gdb debugging. */
term_writes("Memory available:");
/* TODO: implement check_a20, which double-triple checks the state of the A20 line. */
//if(check_a20())
puts(" 4GB");
serial_print(0x3F8, "[INFO] A20 enabled. 4GB memory available.");
/* The first important thing: start the system clock immediately. */
serial_print(0x3F8, "[INFO] Starting System Clock.\r\n");
term_writes("Timer...");
timer_install();
puts("Timer Ready.");
serial_print(0x3F8, "[INFO] All subsystems ready. Printing message.\r\n");
/* Everything is ready; print a pretty message. */
term_setcolor(RED);
term_writes("\n(c)");
term_setcolor(GREEN);
term_writes(" Sync");
term_setcolor(WHITE);
term_writes(", 2019\n");
serial_print(0x3F8, "[INFO] All operations complete. Checking for other tasks...\r\n");
/* Here are a series of tests for the ANSI escape code and CSI implementations. */
term_writes("\x1b[BA"); /* Down a line, then A. */
/* A stub causing a Divide by Zero error. */
serial_print(0x3F8, "[DEBUG] Attempting a Divide by Zero error.\r\n");
char div = (5 / 0);
serial_print(0x3F8, "[DEBUG] Survived the error!\r\n");
gdb_end(); /* Everything is done. The last debug routine. */
return 0;
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}