/* Functions related to both serial console output/intput device driver */
static int init(void* device, void* data) {
if(serial_enabled)
return 0; // Already enabled
if((port_in8(SERIAL_IO_ADDR + 0x05) == 0xFF)
&& (port_in8(SERIAL_IO_ADDR + 0x06) == 0xFF)) {
serial_enabled = false;
return -1;
}
/* Disable interrupts. */
port_out8(SERIAL_IO_ADDR + 0x01, 0);
/* Assert RTS and DTR. */
port_out8(SERIAL_IO_ADDR + 0x04, 3);
/* Set the Line control register to user divisor latch. */
uint8_t reg = port_in8(SERIAL_IO_ADDR + 0x03);
port_out8(SERIAL_IO_ADDR + 0x03, reg | 0x80);
/* Set the divisor latch for speed. */
int speed = SERIAL_SPEED; // Full speed
uint16_t divisor = 115200 / speed;
port_out8(SERIAL_IO_ADDR + 0x00, divisor & 0xFF);
port_out8(SERIAL_IO_ADDR + 0x01, divisor >> 8);
/* Restore the previous value of the divisor. *
* And set 8 bits per character */
port_out8(SERIAL_IO_ADDR + 0x03, (reg & ~0x80));
serial_enabled = true;
return 0;
}
/* Functions related to serial console output device driver */
static void serial_putchar(uint8_t ch) {
while((port_in8(SERIAL_IO_ADDR + 0x05) & 0x20) == 0); // Wait till empty
port_out8(SERIAL_IO_ADDR, ch);
if(ch == '\n')
serial_putchar('\r');
}
void apic_activate() {
// Disable PIT
#define PIT_FREQUENCY 1193180
#define PIT_COUNTER0 0x40
#define PIT_COUNTER1 0x41
#define PIT_COUNTER2 0x42
#define PIT_COMMAND 0x43
#define PIT_CHANNEL0 0x00
#define PIT_CHANNEL1 0x40
#define PIT_CHANNEL2 0x60
#define PIT_LATCH 0x00
#define PIT_LOW 0x10
#define PIT_HIGH 0x20
#define PIT_LOWHIGH 0x30
#define PIT_MODE0 0x00
#define PIT_MODE1 0x02
#define PIT_MODE2 0x04
#define PIT_MODE3 0x06
#define PIT_MODE4 0x08
#define PIT_MODE5 0x0a
#define PIT_MODE6 0x0c
#define PIT_MODE7 0x0e
#define PIT_BIN 0x00
#define PIT_BCD 0x01
port_out8(PIT_COMMAND, PIT_CHANNEL0 | PIT_LOWHIGH | PIT_MODE0 | PIT_BIN);
uint16_t interval = 0;
port_out8(PIT_COUNTER0, (interval >> 0) & 0xff);
port_out8(PIT_COUNTER0, (interval >> 8) & 0xff);
// Disable PIC(mask all)
#define PIC_MASTER_PORT2 0x21
#define PIC_SLAVE_PORT2 0xa1
port_out8(PIC_MASTER_PORT2, 0xff);
port_out8(PIC_SLAVE_PORT2, 0xff);
printf("\tActivate local APICs...\n");
void _apic_activate();
_apic_activate();
}
static void vga_move_cursor(uint_t row,
uint_t column)
{
uint_t position;
/* assert(row >= 0); */
assert(row < VGA_ROWS);
/* assert(column >= 0); */
assert(column < VGA_COLUMNS);
position = (row * VGA_COLUMNS + column);
port_out8(VGA_COMMAND_PORT, VGA_SET_CURSOR_HIGH);
port_out8(VGA_DATA_PORT, (position >> 8));
port_out8(VGA_COMMAND_PORT, VGA_SET_CURSOR_LOW);
port_out8(VGA_DATA_PORT, (position & 0xFF));
}
// 0xff0000: hour, 0xff00: minute, 0xff: second
static uint32_t rtc_time() {
uint32_t result = 0;
uint32_t tmp;
port_out8(RTC_ADDRESS, RTC_ADDR_HOUR);
tmp = port_in8(RTC_DATA);
result |= BCD(tmp) << 16;
port_out8(RTC_ADDRESS, RTC_ADDR_MINUTE);
tmp = port_in8(RTC_DATA);
result |= BCD(tmp) << 8;
port_out8(RTC_ADDRESS, RTC_ADDR_SECOND);
tmp = port_in8(RTC_DATA);
result |= BCD(tmp) << 0;
return result;
}
// 0xff000000: year, 0xff0000: month, 0xff00: day of month, 0xff: day of week
static uint32_t rtc_date() {
uint32_t result = 0;
uint32_t tmp;
port_out8(RTC_ADDRESS, RTC_ADDR_YEAR);
tmp = port_in8(RTC_DATA);
result |= BCD(tmp) << 24;
port_out8(RTC_ADDRESS, RTC_ADDR_MONTH);
tmp = port_in8(RTC_DATA);
result |= BCD(tmp) << 16;
port_out8(RTC_ADDRESS, RTC_ADDR_DATE);
tmp = port_in8(RTC_DATA);
result |= BCD(tmp) << 8;
port_out8(RTC_ADDRESS, RTC_ADDR_WEEK);
tmp = port_in8(RTC_DATA);
result |= BCD(tmp) << 0;
return result;
}
int vga_init(void)
{
assert(!initialized);
vga.base = (uint8_t *) VGA_BASE;
vga.row = 0;
vga.column = 0;
/*
* NOTE:
* Set the first scan line for the cursor, and the blinking
* mode. First scan line is 11, so that we have a visible
* cursor.
*/
port_out8(VGA_COMMAND_PORT, VGA_SET_CURSOR_START);
port_out8(VGA_DATA_PORT, ((0x2 << 5) | 11));
vga_clear();
initialized = 1;
return 1;
}
