70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
#include "exception.h"
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#include "gdt.h"
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#include "idt.h"
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#include "interrupt.h"
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#include "io.h"
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#include "irq.h"
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#include "klibc.h"
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#include "mem.h"
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#include "multiboot.h"
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#include "pit.h"
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#include "stdarg.h"
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#include "vga.h"
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#define CHECK_FLAG(flags, bit) ((flags) & (1 << (bit)))
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void cpuid(int code, uint32_t *a, uint32_t *d)
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{
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asm volatile("cpuid" : "=a"(*a), "=d"(*d) : "0"(code) : "ebx", "ecx");
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}
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// Multiboot information available here :
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// https://www.gnu.org/software/grub/manual/multiboot/multiboot.html#kernel_002ec
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void kmain(unsigned long magic, unsigned long addr)
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{
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unsigned long upper_mem = 0;
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initVGA(BLACK, GREEN);
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printf("Setting up IDT\n");
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gdtSetup();
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idtSetup();
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irqSetup();
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initPit(100);
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if (magic == MULTIBOOT_BOOTLOADER_MAGIC) { // Get loaded by Grub wuth mutliboot version 1
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multiboot_info_t *mbi = (multiboot_info_t *)addr;
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/* Are mem_* valid? */
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if (CHECK_FLAG(mbi->flags, 0)) {
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printf("mem_lower = %dKB mem_upper %dKB\n", mbi->mem_lower, mbi->mem_upper);
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upper_mem = mbi->mem_upper;
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}
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/* Is boot_device valid? */
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if (CHECK_FLAG(mbi->flags, 1)) {
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printf("boot_device = %d\n", mbi->boot_device);
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}
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/* Is the command line passed? */
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if (CHECK_FLAG(mbi->flags, 2)) {
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printf("cmdline = %s\n", (char *)mbi->cmdline);
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}
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}
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if (upper_mem == 0) {
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printf("Cannot get upper phy mem bound. Using default value 32MB\n");
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upper_mem = 32 * 1024;
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}
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memInit(upper_mem);
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printf("Setting up IRQ handlers\n");
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irqSetRoutine(IRQ_KEYBOARD, keyboard_handler);
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irqSetRoutine(IRQ_TIMER, timer_handler);
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printf("Enabling HW interrupts\n");
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exceptionSetRoutine(EXCEPTION_DOUBLE_FAULT, print_handler);
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// Enabling the HW interrupts
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asm volatile("sti\n");
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int count = 0;
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while (1) {
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printIntDetails(count++, GREEN, BLACK, 0, VGA_HEIGHT - 1);
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}
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printf("exiting\n");
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}
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