aedrix-kernel/kernel/start_kernel.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 <kmalloc.h>
#include <mmu.h>
#include <mm.h>
#include <print.h>
#include <devices/pi_mini_uart.h>

#include <devices/bcm2835_videocore.h>
#include <framebuffer.h>
#include <console.h>

struct fb myfb;

void video(void) {
	unsigned int x, y;
	bcm2835_videocore_init(&myfb, 16);

	for (y = 0; y < myfb.height; y++)
		for (x = 0; x < myfb.width; x++)
			fb_write_pixel(&myfb, x, y, 0x3f, 0x0, 0x6f);

	console_init(&myfb);
}

void test_mm() {
	struct page *p, *q;

	print("\ntest_mm():\n");

	p = mm_get_free_pages(0);
	if (p)
		print("%x, %x\n", p, p->address);
	else
		print("Error: failed to allocate memory for p\n");

	q = mm_get_free_pages(4);
	if (q)
		print("%x, %x\n", q, q->address);
	else
		print("Error: failed to allocate memory for q\n");

	mm_put_free_pages(p);
	mm_put_free_pages(q);

	q = mm_get_free_pages(1);
	if (q)
		print("%x, %x\n", q, q->address);
	else
		print("Error: failed to allocate memory for q\n");

	p = mm_get_free_pages(0);
	if (p)
		print("%x, %x\n", p, p->address);
	else
		print("Error: failed to allocate memory for p\n");
	mm_put_free_pages(p);
	mm_put_free_pages(q);

}

void test_kmalloc() {
	void *a, *b, *c, *d;

	print("\ntest_kmalloc():\n");

	a = kmalloc(4);
	print("a: %x\n", a);
	b = kmalloc(13);
	print("b: %x\n", b);
	c = kmalloc(4);
	print("c: %x\n", c);
	d = kmalloc(25);
	print("d: %x\n", d);

	kfree(c);
	kfree(b);
	kfree(a);
	kfree(d);

	a = kmalloc(13);
	print("a: %x\n", a);
	b = kmalloc(4);
	print("b: %x\n", b);
	c = kmalloc(25);
	print("c: %x\n", c);
	d = kmalloc(7);
	print("d: %x\n", d);
}

void test_memory() {
	test_mm();
	test_kmalloc();
}

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

	//setup MMU
	mmu_reinit();

	//initialize the serial console
	mini_uart_init();
	print_init(&mini_uart_putc);

	//setup memory
	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;
		declare_memory_region(lower, upper);
	} while (!atags_next_mem_region(&atags));

	test_memory();

	video();

	return 0;
}