/**
* @brief Raises processor execution level.
*
* @note This function must be called in an interrupt-safe environment.
*/
PUBLIC unsigned processor_raise(unsigned irqlvl)
{
unsigned old_irqlvl;
old_irqlvl = curr_proc->irqlvl;
pic_mask(int_masks[curr_proc->irqlvl = irqlvl]);
return (old_irqlvl);
}
static void pic_setup(unsigned irq, unsigned long flags)
{
if ((flags & HWIRQ_HIGH) || (flags & HWIRQ_LOW))
debug("Level triggered irqs aren't supported\n");
if (flags & HWIRQ_DISABLED)
pic_mask(irq);
else
pic_unmask(irq);
}
void pic_init(void)
{
/* ICW1 */
outb(PIC1_PORT_A, PIC1_ICW1);
outb(PIC2_PORT_A, PIC2_ICW1);
/* ICW2 */
outb(PIC1_PORT_B, PIC1_ICW2);
outb(PIC2_PORT_B, PIC2_ICW2);
/* ICW3 */
outb(PIC1_PORT_B, PIC1_ICW3);
outb(PIC2_PORT_B, PIC2_ICW3);
/* ICW4 */
outb(PIC1_PORT_B, PIC1_ICW4);
outb(PIC2_PORT_B, PIC2_ICW4);
pic_mask(0xEC, 0xFF);
}
void
_start (void)
{
// debugging
/*
volatile char xxx = 0;
while (xxx == 0)
asm volatile ("pause" ::: "memory");
//*/
// clear BSS:
memset (&_section_bss_start[0], 0,
&_section_bss_end[0] - &_section_bss_start[0]);
videoram_cls (COLOR_NORMAL);
// some welcoming information:
videoram_printf ("\n Welcome to \e%c chaOS! \n\n", COLOR_ERROR);
put_cpu_info ();
put_memory_map ();
if (!nx_bit_present ())
{
videoram_puts (" Your CPU does not support the NX bit! \n", COLOR_ERROR);
khalt ();
}
init_subsystem ("interrupt handling", &interrupts_init, NULL);
videoram_puts ("Running a syscall test: ", COLOR_NORMAL);
if (syscall_test ())
videoram_put_right (" ok ", COLOR_INFO);
else
{
videoram_put_right (" FAIL ", COLOR_ERROR);
khalt ();
}
init_subsystem ("PIC", &pic_init, NULL);
pit_set_handler (pic_handler_fun);
pic_mask (~PIC_MASK_PIT);
videoram_puts ("Setting CPU standards", COLOR_NORMAL);
cr0_set_reset (CR0_WP|CR0_NE, CR0_MP|CR0_EM|CR0_NE|CR0_AM|CR0_CD|CR0_NW);
msr_set_reset (MSR_EFER, EFER_NXE, 0);
videoram_put_right (" ok ", COLOR_INFO);
init_subsystem ("paging", &paging_init, NULL);
videoram_puts ("Enabling interrupts", COLOR_NORMAL);
asm volatile ("sti");
videoram_put_right (" ok ", COLOR_INFO);
init_subsystem ("real-time clock", &rtc_init, NULL);
init_subsystem ("timeout handler", &timeout_init, NULL);
init_subsystem ("random number generator", &random_init, NULL);
init_subsystem ("frame allocator", &frame_allocator_init, NULL);
init_subsystem ("Interrupt timer (33Hz)", &pit_init_33hz, NULL);
pic_mask (~0);
init_subsystem ("PS/2 keyboard", &keyboard_init, NULL);
init_subsystem ("PS/2 mouse", &mouse_init, NULL);
init_subsystem ("keypress handler", &keypress_handler_init, NULL);
ENSURE (keypress_handler_set_keymap (KEYMAP_QWERTZ_DE_DE));
// TODO: initialize more subsystems
put_welcoming_message ();
// TODO: do something
for (;;)
{
int c = keypress_handler_getc ();
if (!c)
break;
if (c < 128 && c != 127)
videoram_printf ("C: <%c>\n", c);
}
khalt ();
}
/**
* @brief Drops processor execution level.
*
* @note This function must be called in an interrupt-safe environment.
*/
PUBLIC void processor_drop(unsigned irqlvl)
{
pic_mask(int_masks[curr_proc->irqlvl = irqlvl]);
}
/**
* @brief Reloads the processor execution level.
*
* @note This function must be called in an interrupt-safe environment.
*/
PUBLIC void processor_reload(void)
{
pic_mask(int_masks[curr_proc->irqlvl]);
}
