From 211a6e931805bfa4962de0dc4aaa40aebdb6b513 Mon Sep 17 00:00:00 2001
From: Ruslan Isaev <ubijca16@gmail.com>
Date: Sun, 16 Mar 2025 13:26:38 +0300
Subject: [PATCH] start implementing time utils

---
 include/utils.h |  2 ++
 src/utils.c     | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/include/utils.h b/include/utils.h
index 9599006..e0c117e 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -4,6 +4,8 @@
 
 uint8 inportb(uint16 _port);
 void outportb(uint16 _port, uint8 _data);
+uint8_t get_rtc(uint8_t reg);
+void get_fancy_datetime();
 
 #define inb inportb
 #define outb outportb
diff --git a/src/utils.c b/src/utils.c
index 9294b01..05709bb 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -12,3 +12,24 @@ void outportb(uint16 _port, uint8 _data)
 {
 	__asm__ __volatile__ ("outb %1, %0" : : "dN" (_port), "a" (_data));
 }
+
+uint8_t get_rtc(uint8_t reg)
+{
+        uint8_t nmi_disable_bit = 0;
+        outb(0x70, (nmi_disable_bit << 7) | reg);
+        uint8_t result = inb(0x71);
+
+        return result;
+}
+
+void get_fancy_datetime()
+{
+        uint8_t century = get_rtc(0x32);
+        uint8_t year = get_rtc(0x09);
+        uint8_t month = get_rtc(0x08);
+        uint8_t day_of_month = get_rtc(0x07);
+        uint8_t hour = get_rtc(0x04);
+        uint8_t minute = get_rtc(0x02);
+        uint8_t second = get_rtc(0x00);
+        printf("%X-%X-%X%X %X:%X:%X\n", day_of_month, month, century, year, hour, minute, second);
+}