diff options
Diffstat (limited to '')
| -rw-r--r-- | kernel/drivers.c | 2 | ||||
| -rw-r--r-- | kernel/drivers/pit.c | 23 |
2 files changed, 25 insertions, 0 deletions
diff --git a/kernel/drivers.c b/kernel/drivers.c index 04145db..15de4df 100644 --- a/kernel/drivers.c +++ b/kernel/drivers.c @@ -3,10 +3,12 @@ #include <comus/drivers/uart.h> #include <comus/drivers/pci.h> #include <comus/drivers/gpu.h> +#include <comus/drivers/pit.h> #include <comus/mboot.h> void drivers_init(void) { + pit_set_divider(100); // 1ms uart_init(); pci_init(); acpi_init(mboot_get_rsdp()); diff --git a/kernel/drivers/pit.c b/kernel/drivers/pit.c new file mode 100644 index 0000000..cb3c091 --- /dev/null +++ b/kernel/drivers/pit.c @@ -0,0 +1,23 @@ +#include <comus/asm.h> +#include <comus/drivers/pit.h> + +#define CHAN_0 0x40 +#define CHAN_1 0x41 +#define CHAN_2 0x42 +#define CMD 0x43 + +uint64_t ticks = 0; + +uint16_t pit_read_divider(void) { + uint16_t count = 0; + cli(); + outb(CMD, 0); // clear bits + count = inb(CHAN_0); // low byte + count |= inb(CHAN_0)<<8; // highbyte + return count; +} + +void pit_set_divider(uint16_t count) { + outb(CHAN_0, count & 0xFF); // low byte + outb(CHAN_0, (count & 0xFF00) >> 8); // high byte +} |