118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
// Kernel entry point
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// Author: xamidev
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// Licensed under the Unlicense. See the repo below.
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// https://github.com/xamidev/blankos
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#include "../libk/stdio.h"
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#include "../drivers/serial.h"
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#include "gdt.h"
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#include "idt.h"
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#include "system.h"
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#include <stdint.h>
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#include "../drivers/framebuffer.h"
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#include "kmain.h"
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#include "multiboot2.h"
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#include "kheap.h"
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#include "initrd.h"
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void kmain(multiboot2_info *mb_info)
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{
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multiboot2_tag_framebuffer *fb_info = NULL;
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struct multiboot_tag_mmap *mmap_tag = NULL;
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struct multiboot_tag_module *initrd_module = NULL;
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uint8_t *tags = mb_info->tags;
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while (1) {
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uint32_t tag_type = *((uint32_t*) tags);
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uint32_t tag_size = *((uint32_t*) (tags + 4));
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if (tag_type == 0) break;
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if (tag_type == MULTIBOOT_TAG_TYPE_FRAMEBUFFER) {
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fb_info = (multiboot2_tag_framebuffer*) tags;
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}
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if (tag_type == MULTIBOOT_TAG_TYPE_MMAP) {
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mmap_tag = (struct multiboot_tag_mmap*) tags;
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}
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if (tag_type == MULTIBOOT_TAG_TYPE_MODULE) {
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initrd_module = (struct multiboot_tag_module*) tags;
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}
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tags += ((tag_size + 7) & ~7);
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}
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if (fb_info) { // fb setup
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framebuffer = (uint32_t *)(uintptr_t) fb_info->framebuffer_addr;
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uint32_t width = fb_info->framebuffer_width;
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uint32_t height = fb_info->framebuffer_height;
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bpp = fb_info->framebuffer_bpp;
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pitch = fb_info->framebuffer_pitch;
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//8x16 font, not padded
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VGA_WIDTH = width/8;
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VGA_HEIGHT = height/16;
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serial_printf(3, "VGA_WIDTH=%d, VGA_HEIGHT=%d", VGA_WIDTH, VGA_HEIGHT);
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scanline = width * (bpp/8);
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serial_printf(3, "Framebuffer Address: 0x%x", fb_info->framebuffer_addr);
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serial_printf(3, "Framebuffer Width: %u", fb_info->framebuffer_width);
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serial_printf(3, "Framebuffer Height: %u", fb_info->framebuffer_height);
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serial_printf(3, "Framebuffer Pitch: %u", fb_info->framebuffer_pitch);
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serial_printf(3, "Framebuffer BPP: %u", fb_info->framebuffer_bpp);
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}
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psf_init();
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printf("[kernel] multiboot2 info at 0x%x, size=%u\n", mb_info, mb_info->total_size);
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printf("[kernel] framebuffer discovered at 0x%x\n", (unsigned int)fb_info->framebuffer_addr);
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printf("[kernel] fb0: width=%u, height=%u, pitch=%u, bpp=%u\n", fb_info->framebuffer_width, fb_info->framebuffer_height, fb_info->framebuffer_pitch, fb_info->framebuffer_bpp);
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if (mmap_tag) // memmap debug print
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{
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puts("[kernel] found memory map tag by multiboot2\n");
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struct multiboot_mmap_entry *mmap = mmap_tag->entries;
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while ((uint8_t*) mmap < tags + mmap_tag->size)
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{
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if (mmap->addr != 0)
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{
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/*
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serial_printf(3, "base addr=0x%x%x, length=0x%x%x, type=%u",
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(uint32_t) (mmap->addr >> 32),
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(uint32_t) (mmap->addr & 0xFFFFFFFF),
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(uint32_t) (mmap->len >> 32),
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(uint32_t) (mmap->len & 0xFFFFFFFF),
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mmap->type);
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*/
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}
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mmap = (struct multiboot_mmap_entry*) ((uint8_t*)mmap + mmap_tag->entry_size);
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}
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}
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if (initrd_module) {
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initrd_addr = initrd_module->mod_start;
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uint32_t initrd_start = initrd_module->mod_start;
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uint32_t initrd_end = initrd_module->mod_end;
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uint32_t initrd_size = initrd_end - initrd_start;
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printf("[kernel] TAR initrd module found at 0x%x, size=%u bytes\n", initrd_start, initrd_size);
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} else {
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puts("[kernel] TAR initrd module not found\n");
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}
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init_serial();
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gdt_install();
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idt_install();
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isr_install();
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irq_install();
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__asm__ __volatile__("sti");
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init_alloc();
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timer_install();
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printf("Nothing to do, halting...");
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asm("hlt");
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}
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