void kmain(multiboot_info_t* mbt, unsigned int magic)
{
if (magic != MULTIBOOT_BOOTLOADER_MAGIC)
return;
graphics_init();
/* Core modules */
gdt_init();
idt_init();
irq_init();
isr_init();
/* Kernel heap */
heap_init();
/* Drivers */
timer_init();
tasking_init();
keyboard_init();
/* Let the games begin */
set_interrupts(ENABLED);
kprintf("Running kernel tests...\n\n");
test_kmalloc_kfree();
test_list();
test_tasking();
kprintf("\nDone with kernel tests.\n");
for (;;);
}
void mutex_lock(mutex_t* m)
{
assert(m);
assert(m->waiting_queue);
uint8_t old_status = set_interrupts(DISABLED);
assert(!m->owner || m->owner != current_thread);
if (m->owner) {
list_enqueue(m->waiting_queue, current_thread);
thread_sleep();
} else {
m->owner = current_thread;
}
set_interrupts(old_status);
}
void main()
{
INT8 i;
UINT8 input;
UFIX16 amount;
amount.U16 = 0x0000U;
set_bkg_data(0, 42, roadTiles);
set_bkg_tiles(0, 0, 32, 32, roadGrid);
offsetIndex = 0;
for (i = 0; i < 80; i++)
{
roadOffset[i] = 0;
}
SPRITES_8x8;
SHOW_SPRITES;
SHOW_BKG;
HIDE_WIN;
LYC_REG = 0x07U;
STAT_REG = 0x20U;
set_interrupts(VBL_IFLAG | LCD_IFLAG);
add_LCD(HBLANK);
add_VBL(VBLANK);
enable_interrupts();
frameReady = 0;
while (1)
{
if (frameReady == 0)
{
input = joypad();
if (input & J_LEFT)
{
amount.U8.intp -= 10;
}
if (input & J_RIGHT)
{
amount.U8.intp += 10;
}
MoveHr(&amount);
frameReady = 1;
}
}
}
void mutex_unlock(mutex_t* m)
{
assert(m);
assert(m->waiting_queue);
thread_t* t = NULL;
uint8_t old_status = set_interrupts(DISABLED);
assert(m->owner == current_thread);
if (m->waiting_queue->length != 0) {
t = (thread_t*)list_dequeue(m->waiting_queue);
assert(t);
m->owner = t;
make_thread_ready(t);
} else {
m->owner = NULL;
}
set_interrupts(old_status);
}
void main()
{
/* Ensure mutual exclusion (not really necessary in this example)... */
disable_interrupts();
vbl_cnt = tim_cnt = 0;
add_VBL(vbl);
add_TIM(tim);
enable_interrupts();
/* Set TMA to divide clock by 0x100 */
TMA_REG = 0x00U;
/* Set clock to 4096 Hertz */
TAC_REG = 0x04U;
/* Handle VBL and TIM interrupts */
set_interrupts(VBL_IFLAG | TIM_IFLAG);
while(1) {
print_counter();
delay(1000UL);
}
}