From e8a76b2f6b53d99640ceb2850bf4e45118b923f1 Mon Sep 17 00:00:00 2001 From: Ada Christine Date: Sun, 13 Feb 2022 18:47:58 +0000 Subject: rudimentary irq and timer support --- kc/core/pit8253.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 kc/core/pit8253.c (limited to 'kc/core/pit8253.c') diff --git a/kc/core/pit8253.c b/kc/core/pit8253.c new file mode 100644 index 0000000..75e0467 --- /dev/null +++ b/kc/core/pit8253.c @@ -0,0 +1,36 @@ +#include "pit8253.h" +#include "pic8259.h" +#include "port.h" + +#define PIT8253_DATA0 0x40 +#define PIT8253_CMD 0x43 + +#define SEL_CHANNEL0 0x0 +#define ACC_LOHI 0x30 +#define MODE_RATE 0x04 +#define BIN_COUNT 0x0 + +#define CONFIG_CHANNEL_0 (SEL_CHANNEL0|ACC_LOHI|MODE_RATE|BIN_COUNT) + +void pit8253_init(void) +{ + outb(PIT8253_CMD, CONFIG_CHANNEL_0); + outb(PIT8253_DATA0, 0xff); + outb(PIT8253_DATA0, 0xff); + + pic8259_irq_unmask(0); +} + +void pit8253_start(void) +{ +} + +void pit8253_stop(void) +{ +} + +void pit8253_set_hz(uint16_t hz) +{ + (void)hz; +} + -- cgit v1.3.1-1-g115d