separating: there will be libk and libc

2025-01-07 15:23:14 +01:00
parent b3687d20ee
commit a8582ba343
32 changed files with 29 additions and 31 deletions
--- a/kernel/kmain.c
+++ b/kernel/kmain.c
@@ -0,0 +1,117 @@
+// Kernel entry point
+// Author: xamidev
+// Licensed under the Unlicense. See the repo below.
+// https://github.com/xamidev/blankos
+
+#include "../libk/stdio.h"
+#include "../drivers/serial.h"
+#include "gdt.h"
+#include "idt.h"
+#include "system.h"
+#include <stdint.h>
+#include "../drivers/framebuffer.h"
+#include "kmain.h"
+#include "multiboot2.h"
+#include "kheap.h"
+#include "initrd.h"
+
+void kmain(multiboot2_info *mb_info)
+{
+	multiboot2_tag_framebuffer *fb_info = NULL;
+	struct multiboot_tag_mmap *mmap_tag = NULL;
+	struct multiboot_tag_module *initrd_module = NULL;
+
+    uint8_t *tags = mb_info->tags;
+    while (1) {
+        uint32_t tag_type = *((uint32_t*) tags);
+        uint32_t tag_size = *((uint32_t*) (tags + 4));
+
+        if (tag_type == 0) break;
+        if (tag_type == MULTIBOOT_TAG_TYPE_FRAMEBUFFER) {
+            fb_info = (multiboot2_tag_framebuffer*) tags;
+        }
+	if (tag_type == MULTIBOOT_TAG_TYPE_MMAP) {
+		mmap_tag = (struct multiboot_tag_mmap*) tags;
+	}
+	if (tag_type == MULTIBOOT_TAG_TYPE_MODULE) {
+		initrd_module = (struct multiboot_tag_module*) tags;
+	}
+
+        tags += ((tag_size + 7) & ~7);
+    }
+
+    if (fb_info) { // fb setup
+        framebuffer = (uint32_t *)(uintptr_t) fb_info->framebuffer_addr;
+
+        uint32_t width = fb_info->framebuffer_width;
+        uint32_t height = fb_info->framebuffer_height;
+        bpp = fb_info->framebuffer_bpp;
+	pitch = fb_info->framebuffer_pitch;
+
+        //8x16 font, not padded 
+        VGA_WIDTH = width/8;
+        VGA_HEIGHT = height/16;
+        serial_printf(3, "VGA_WIDTH=%d, VGA_HEIGHT=%d", VGA_WIDTH, VGA_HEIGHT);
+        scanline = width * (bpp/8);	
+
+    	serial_printf(3, "Framebuffer Address: 0x%x", fb_info->framebuffer_addr);
+	serial_printf(3, "Framebuffer Width: %u", fb_info->framebuffer_width);
+	serial_printf(3, "Framebuffer Height: %u", fb_info->framebuffer_height);
+	serial_printf(3, "Framebuffer Pitch: %u", fb_info->framebuffer_pitch);
+	serial_printf(3, "Framebuffer BPP: %u", fb_info->framebuffer_bpp);
+    }
+    psf_init();
+    printf("[kernel] multiboot2 info at 0x%x, size=%u\n", mb_info, mb_info->total_size);
+    printf("[kernel] framebuffer discovered at 0x%x\n", (unsigned int)fb_info->framebuffer_addr);
+    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);
+
+    if (mmap_tag) // memmap debug print
+    {
+	puts("[kernel] found memory map tag by multiboot2\n");
+	struct multiboot_mmap_entry *mmap = mmap_tag->entries;
+
+	while ((uint8_t*) mmap < tags + mmap_tag->size)
+	{
+		
+		if (mmap->addr != 0)
+		{
+			/*
+			serial_printf(3, "base addr=0x%x%x, length=0x%x%x, type=%u",
+				(uint32_t) (mmap->addr >> 32),
+				(uint32_t) (mmap->addr & 0xFFFFFFFF),
+				(uint32_t) (mmap->len >> 32),
+				(uint32_t) (mmap->len & 0xFFFFFFFF),
+				mmap->type);
+			*/
+		}
+
+		mmap = (struct multiboot_mmap_entry*) ((uint8_t*)mmap + mmap_tag->entry_size);
+	}
+    }
+
+    if (initrd_module) {
+	initrd_addr = initrd_module->mod_start;
+
+	uint32_t initrd_start = initrd_module->mod_start;
+	uint32_t initrd_end = initrd_module->mod_end;
+	uint32_t initrd_size = initrd_end - initrd_start;
+
+	printf("[kernel] TAR initrd module found at 0x%x, size=%u bytes\n", initrd_start, initrd_size);
+
+    } else {
+	puts("[kernel] TAR initrd module not found\n");
+    }
+
+    init_serial();
+    gdt_install();
+    idt_install();
+    isr_install();
+    irq_install();
+    __asm__ __volatile__("sti");
+
+    init_alloc();
+
+    timer_install();
+    printf("Nothing to do, halting...");
+    asm("hlt");
+}