78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
#include "multiboot.h"
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#include "vga.h"
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static inline void outb(unsigned short port, unsigned char val) {
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asm volatile ("outb %0, %1" : : "a"(val), "Nd"(port) : "memory");
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}
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char* itoa(int value, int base) {
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char* result;
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// check that the base if valid
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if (base < 2 || base > 36) { *result = '\0'; return result; }
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char* ptr = result, *ptr1 = result, tmp_char;
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int tmp_value;
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do {
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tmp_value = value;
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value /= base;
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*ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz" [35 + (tmp_value - value * base)];
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} while ( value );
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// Apply negative sign
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if (tmp_value < 0) *ptr++ = '-';
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*ptr-- = '\0';
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while(ptr1 < ptr) {
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tmp_char = *ptr;
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*ptr--= *ptr1;
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*ptr1++ = tmp_char;
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}
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return result;
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}
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void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) {
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// Cursor disabling
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outb(0x3D4, 0x0A);
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outb(0x3D5, 0x20);
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//cls();
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vga_init(VGA_COLOR_BLACK, VGA_COLOR_GRAY);
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vga_write_line("=== KoalemOS ===");
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vga_write("Checking multiboot loader: ");
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// Check multiboot header
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if (mbootmagick != MULTIBOOT_BOOTLOADER_MAGIC) {
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vga_write_color("INVALID MAGIC", VGA_COLOR_BLACK, VGA_COLOR_RED);
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return;
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}
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if (mbootinfo->flags & MULTIBOOT_INFO_BOOT_LOADER_NAME)
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vga_write((char *)mbootinfo->boot_loader_name);
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else
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vga_write_color("Unknown", VGA_COLOR_BLACK, VGA_COLOR_ORANGE);
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vga_write("\nMultiboot flags: ");
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vga_write(itoa(mbootinfo->flags, 2));
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// Check videomode
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vga_write("\nVideomode: ");
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if (mbootinfo->flags & MULTIBOOT_INFO_VBE_INFO) {
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vga_write("VBE 0x");
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vga_write(itoa(mbootinfo->vbe_mode, 16));
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} else if (mbootinfo->flags & MULTIBOOT_INFO_FRAMEBUFFER_INFO) {
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vga_write("Framebuffer");
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vga_write("\nVideo address: 0x");
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vga_write(itoa(mbootinfo->framebuffer_addr, 16));
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unsigned long long *vmem = &mbootinfo->framebuffer_addr;
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*vmem = 0xff00ff;
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} else {
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vga_write_color("Not available", VGA_COLOR_BLACK, VGA_COLOR_RED);
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return;
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}
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vga_write_line("\nExecution finished, halting...");
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}
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