Curle
4edd4b7cc8
All ISR/IRQ stuff moved into its own header and source. Comments added on all major parts. Some optimisations in important functions. All ASM removed for ISR and IRQ, instead using new GCC directives.
86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/************************
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*** Team Kitty, 2019 ***
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*** ProjectRED ***
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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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/* 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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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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/* 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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/* 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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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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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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/* 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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timer_install();
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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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/* Everything is ready; print a pretty message. */
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term_writes("\n(c)");
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term_setcolor(GREEN);
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term_writes(" Project");
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term_setcolor(RED);
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term_writes("RED");
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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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/* 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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/* 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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gdb_end(); /* Everything is done. The last debug routine. */
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return 0;
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}
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