Commenting improvements
Even more preparing for UEFI.
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@ -3,88 +3,84 @@
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*** Sync ***
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***********************/
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/* This file contains the entry point
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* to the kernel. This section consists
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* mainly of bootloading functions.
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/*
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* Sync main..
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*
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* Going off the back of Syncboot, the UEFI bootloader which currently only supports x86_64,
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* this kernel is to be rewritten. The kernel is started in Long Mode, with interrupts enabled.
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*
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* Therefore, most of the checks are no longer needed, as they are performed by Syncboot for us.
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* So, this becomes an exercise in time saving.
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*
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*
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* Graphics and memory will be setup
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* at later stages.
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*/
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//#include <stdio.h>
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#include <kernel.h>
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#include <kernel/tty.h>
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#include <kernel/serial.h>
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#include <kernel/descriptor_tables.h>
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void gdb_end() {} /* GDB Debugging stump */
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int kernel_main(void) {
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/* The kernel is started in 32-bit protected mode by the ASM. */
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/* Here, we start by enabling the screen, then loading a GDT and IDT into the actual places they need to be. */
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/* The kernel is started in 64-bit Long Mode by Syncboot. */
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/* Here, we start by drawing a splash, then loading a GDT and IDT into the placeholder UEFI gives us. */
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/* Black the screen out. */
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screen_initialize();
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/* Prepare the serial line for our debug output. */
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init_serial();
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serial_print(0x3F8, "[INFO] Serial ready.\r\n");
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/* Not sure how well serial would work in UEFI. */
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// TODO: look at this.
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//init_serial();
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//serial_print(0x3F8, "[INFO] Serial ready.\r\n");
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serial_print(0x3F8, "[INFO] Beginning GDT subroutine.\r\n");
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//serial_print(0x3F8, "[INFO] Beginning GDT subroutine.\r\n");
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/* term_writes: writes a string to the terminal. */
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term_writes("GDT...");
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//term_writes("GDT...");
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/* Prepares the Global Descriptor Table, called from gdt.c */
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gdt_install();
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/* puts: writes a line to the terminal. */
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puts("GDT Ready.");
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serial_print(0x3F8, "[INFO] GDT subroutine complete.\r\n");
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//puts("GDT Ready.");
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//serial_print(0x3F8, "[INFO] GDT subroutine complete.\r\n");
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/* Prepare the Interrupt Descriptor Table. */
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serial_print(0x3F8, "[INFO] Beginning IDT subroutine.\r\n");
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term_writes("IDT...");
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//serial_print(0x3F8, "[INFO] Beginning IDT subroutine.\r\n");
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//term_writes("IDT...");
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idt_install();
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puts("IDT Ready.");
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serial_print(0x3F8, "[INFO] IDT subroutine complete.\r\n[INFO] Enabling interrupts.\r\n");
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//puts("IDT Ready.");
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//serial_print(0x3F8, "[INFO] IDT subroutine complete.\r\n[INFO] Enabling interrupts.\r\n");
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gdb_end(); /* The first important step. Waypoint it for gdb debugging. */
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term_writes("Memory available:");
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/* TODO: implement check_a20, which double-triple checks the state of the A20 line. */
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//if(check_a20())
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puts(" 4GB");
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serial_print(0x3F8, "[INFO] A20 enabled. 4GB memory available.");
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//term_writes("Memory available:");
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/* The first important thing: start the system clock immediately. */
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serial_print(0x3F8, "[INFO] Starting System Clock.\r\n");
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term_writes("Timer...");
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//serial_print(0x3F8, "[INFO] Starting System Clock.\r\n");
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//term_writes("Timer...");
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timer_install();
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puts("Timer Ready.");
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//puts("Timer Ready.");
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serial_print(0x3F8, "[INFO] All subsystems ready. Printing message.\r\n");
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//serial_print(0x3F8, "[INFO] All subsystems ready. Printing message.\r\n");
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/* Everything is ready; print a pretty message. */
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term_setcolor(RED);
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term_writes("\n(c)");
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term_setcolor(GREEN);
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term_writes(" Sync");
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term_setcolor(WHITE);
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term_writes(", 2019\n");
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//term_setcolor(RED);
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//term_writes("\n(c)");
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//term_setcolor(GREEN);
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//term_writes(" Sync");
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//term_setcolor(WHITE);
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//term_writes(", 2019\n");
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serial_print(0x3F8, "[INFO] All operations complete. Checking for other tasks...\r\n");
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//serial_print(0x3F8, "[INFO] All operations complete. Checking for other tasks...\r\n");
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/* Here are a series of tests for the ANSI escape code and CSI implementations. */
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term_writes("\x1b[BA"); /* Down a line, then A. */
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//term_writes("\x1b[BA"); /* Down a line, then A. */
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/* A stub causing a Divide by Zero error. */
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serial_print(0x3F8, "[DEBUG] Attempting a Divide by Zero error.\r\n");
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char div = (5 / 0);
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serial_print(0x3F8, "[DEBUG] Survived the error!\r\n");
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//serial_print(0x3F8, "[DEBUG] Attempting a Divide by Zero error.\r\n");
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//char div = (5 / 0);
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//serial_print(0x3F8, "[DEBUG] Survived the error!\r\n");
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gdb_end(); /* Everything is done. The last debug routine. */
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return 0;
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@ -8,6 +8,10 @@
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* a text buffer, or a file, but this code should work on
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* hardware with an actual serial port and monitor. */
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/* After the development of Syncboot, this becomes a little bit harder.
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* Some testing will be needed to know for certain whether this will work.
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* Until then, this is to be put on hold. 21/07/19 - Curle */
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#include <kernel/utils.h>
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#include <stdarg.h>
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#include <stdint.h>
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