aedrix-kernel/kernel/init.c

/*
    Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>

    This file is part of Aedrix.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <atags.h>
#include <console.h>
#include <framebuffer.h>
#include <kmalloc.h>
#include <print.h>
#include <mm.h>
#include <mmu.h>
#include <types.h>

#include <drivers/fb.h>
#include <drivers/serial.h>


extern uint32 early_initcalls_start, early_initcalls_end;
extern uint32 initcalls_start, initcalls_end;

void init_earlyinitcalls() {
	void (**initcall)();
	for (initcall = (void (**)()) &early_initcalls_start; initcall < (void (**)())&early_initcalls_end; initcall++)
		(*initcall)();
}

void init_initcalls() {
	void (**initcall)();
	for (initcall = (void (**)()) &initcalls_start; initcall < (void (**)())&initcalls_end; initcall++)
		(*initcall)();
}
struct fb console_fb;

void print_console_logo() {
	print("      _            _      _\n");
	print("     / \\   ___  __| |_ __(_)_  __\n");
	print("    / _ \\ / _ \\/ _` | '__| \\ \\/ /\n");
	print("   / ___ \\  __/ (_| | |  | |>  <\n");
	print("  /_/   \\_\\___|\\__,_|_|  |_/_/\\_\\\n\n");
	print("  Copyright (C) 2012 - Aaron Lindsay\n\n\n");
}

void video_console_init(void) {
	struct fb_dev *fbdev = fb_first_device();
	int ret;

	if (!fbdev) {
		print("Error: No framebuffer-capable device registered.");
		return;
	}

	ret = fbdev->init(&console_fb, 16);
	if (ret) {
		print("Error: Failed to initialize framebuffer device.");
		return;
	}

	if ((console_init(&console_fb)))
		return;

	print_register_func(&console_putc);
	print_console_logo();

	print("Initialized video console on %s.\n", fbdev->name);
}

void serial_console_init() {
	struct serial_dev *sdev = serial_first_device();

	if (!sdev)
		return;

	print_register_func_early(sdev->putc);
	print("Initialized serial console on %s\n", sdev->name);
}

//Forward declarations of non-initcall initializations that are only needed
//once, and only here
void serial_init();
void kmalloc_init();

int main(void) {
	char *lower, *upper;
	struct atag *atags;

	//setup MMU
	mmu_reinit();

	/* Initialize the serial subsystem before
	 * init_earlyinitcalls(), because console drivers get
	 * initialized here so as to have an output console as
	 * early as possible, and we don't want those
	 * initializations to fail. */
	serial_init();
	init_earlyinitcalls();
	serial_console_init();

	//setup memory subsystems
	mm_init();
	kmalloc_init();

	if (atags_first_mem_region(&atags)) {
		print("Error: atags must contain at least one memory region\n");
		return -1;
	}

	do {
		lower = (char *)atags->data.mem.start;
		upper = lower + atags->data.mem.size - 1;
		print("atags: physical memory at %x-%x\n", lower, upper);
		declare_memory_region(lower, upper);
	} while (!atags_next_mem_region(&atags));

	init_initcalls();

	video_console_init();

	return 0;
}