tabs/kernel/kernel.c

/* Check if the compiler thinks you are targeting the wrong operating system. */
#if defined(__linux__)
#error "You are not using a cross-compiler, you will most certainly run into trouble"
#endif
 
/* This tutorial will only work for the 32-bit ix86 targets. */
#if !defined(__i386__)
#error "This kernel needs to be compiled with a ix86-elf compiler"
#endif

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

#include "terminal.c"
#include "memory.c"
#include "interrupts.c"
#include "shell.c"

static inline bool are_interrupts_enabled() {
    unsigned long flags;
    asm volatile ( "pushf\n\t"
                   "pop %0"
                   : "=g"(flags) );
    return flags & (1 << 9);
}

void kernel_main(void)
{
    terminal_state state;
    terminal_initialize_state(&state);

    terminal_set_color(&state, VGA_COLOR_BLACK, VGA_COLOR_RED);
	terminal_write_char(&state, 'H');
    terminal_set_color(&state, VGA_COLOR_BLACK, VGA_COLOR_GREEN);
	terminal_write_char(&state, 'e');
    terminal_set_color(&state, VGA_COLOR_BLACK, VGA_COLOR_BLUE);
	terminal_write_char(&state, 'l');
    terminal_set_color(&state, VGA_COLOR_BLACK, VGA_COLOR_MAGENTA);
	terminal_write_char(&state, 'l');
    terminal_set_color(&state, VGA_COLOR_BLACK, VGA_COLOR_WHITE);
	terminal_write_char(&state, 'o');

    terminal_set_color(&state, VGA_COLOR_GREEN, VGA_COLOR_WHITE);
    terminal_write_str(&state," kernel");
    terminal_set_color(&state, VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
    terminal_write_str(&state," World!\n");
	terminal_write_str(&state,"Newlines!\n");

	char* memory_str = alloc(sizeof(char) * 7);
	for (int i = 0; i < 6; i++) {
		memory_str[i] = "Memory"[i];
	}
	memory_str[6] = 0;

	char* management_str = alloc(sizeof(char) * 13);
	for (int i = 0; i < 13; i++) {
		management_str[i] = " management!\n"[i];
	}
	management_str[13] = 0;

	/* terminal_write_str(&state,memory_str); */
	/* terminal_write_str(&state,management_str); */

	terminal_write_str(&state, (are_interrupts_enabled())? "Interrupts!\n": "No interrupts :(\n");

    shell_set_terminal_state(&state);
    exception_set_terminal_state(&state);
	interrupt_init();

	for(;;) {
		shell_step();
	}
}