82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/* Check if the compiler thinks you are targeting the wrong operating system. */
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#if defined(__linux__)
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#error "You are not using a cross-compiler, you will most certainly run into trouble"
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#endif
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/* This tutorial will only work for the 32-bit ix86 targets. */
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#if !defined(__i386__)
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#error "This kernel needs to be compiled with a ix86-elf compiler"
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#endif
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include "terminal.c"
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#include "memory.c"
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#include "interrupts.c"
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#include "shell.c"
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#include "util/printer.c"
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static inline bool are_interrupts_enabled() {
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unsigned long flags;
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asm volatile ( "pushf\n\t"
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"pop %0"
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: "=g"(flags));
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return flags & (1 << 9);
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}
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void kernel_main(void) {
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/* Initialize terminal interface */
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terminal_initialize();
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terminal_putchar('H');
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terminal_putchar('e');
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terminal_putchar('l');
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terminal_putchar('l');
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terminal_putchar('o');
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terminal_setcolor(vga_entry_color(VGA_COLOR_GREEN, VGA_COLOR_BLACK));
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print(" kernel");
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terminal_setcolor(vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK));
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print(" World!\n");
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print("Newlines!\n");
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char *memory_str = alloc(sizeof(char) * 7);
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for (int i = 0; i < 6; i++) {
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memory_str[i] = "Memory"[i];
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}
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memory_str[6] = 0;
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char *management_str = alloc(sizeof(char) * 13);
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for (int i = 0; i < 13; i++) {
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management_str[i] = " management!\n"[i];
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}
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management_str[13] = 0;
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print(memory_str);
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print(management_str);
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free(memory_str);
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free(management_str);
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// Some dummy allocations to demonstrate the states of memory and to showcase the memory dump printout.
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void* ptr = alloc(30);
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alloc(30);
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alloc(31);
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free(ptr);
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void* ptr2 = alloc(64);
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alloc(61);
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free(ptr2);
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print((are_interrupts_enabled()) ? "Interrupts!\n" : "No interrupts :(\n");
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interrupt_init();
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print_memory();
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for (;;) {
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shell_step();
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}
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} |