src/drivers/rtc.c

@@ -0,0 +1,64 @@
+// Real-time clock driver implementation for better PRNG
+// Author: xamidev
+// Licensed under the Unlicense. See the repo below.
+// https://github.com/xamidev/blankos
+
+#include <stdint.h>
+#include "rtc.h"
+#include "../kernel/io.h"
+#include "../libc/stdio.h"
+
+uint8_t rtc_read_register(uint8_t reg)
+{
+	outb(0x70, reg);
+	return inb(0x71);
+}
+
+uint8_t bcd_to_bin(uint8_t bcd)
+{
+	return ((bcd/16)*10) + (bcd%16);
+}
+
+int rtc_is_updating()
+{
+	outb(0x70, 0x0A);
+	return (inb(0x71) & 0x80);
+}
+
+void rtc_read_time(rtc_time_t *time)
+{
+	while (rtc_is_updating());
+
+	time->seconds = rtc_read_register(0x00);
+	time->minutes = rtc_read_register(0x02);
+	time->hours = rtc_read_register(0x04);
+	time->day = rtc_read_register(0x06);
+	time->month = rtc_read_register(0x07);
+	time->year = rtc_read_register(0x08);
+
+	outb(0x70, 0x0B);
+	uint8_t registerB = inb(0x71);
+
+	if (!(registerB & 0x04))
+	{
+		time->seconds = bcd_to_bin(time->seconds);
+		time->minutes = bcd_to_bin(time->minutes);
+		time->hours = bcd_to_bin(time->hours);
+		time->day = bcd_to_bin(time->day);
+		time->month = bcd_to_bin(time->month);
+		time->year = bcd_to_bin(time->year);
+	}
+}
+
+void print_time(const rtc_time_t *time)
+{
+	printf("%02d/%02d/%02d %02d:%02d:%02d\n", time->day, time->month, time->year, time->hours, time->minutes, time->seconds);
+}
+
+long time_seed()
+{
+	rtc_time_t* time = {0};
+	rtc_read_time(time);
+	
+	return time->day + time->month + time->year + time->hours + time->minutes + time->seconds;	
+}

src/drivers/rtc.h

@@ -0,0 +1,23 @@
+// Real-time clock driver implementation header for better PRNG
+// Author: xamidev
+// Licensed under the Unlicense. See the repo below.
+// https://github.com/xamidev/blankos
+
+#ifndef RTC_H
+#define RTC_H
+
+typedef struct
+{
+	uint8_t seconds;
+	uint8_t minutes;
+	uint8_t hours;
+	uint8_t day;
+	uint8_t month;
+	uint8_t year;
+} rtc_time_t;
+
+void rtc_read_time(rtc_time_t *time);
+long time_seed();
+void print_time(const rtc_time_t *time);
+
+#endif

src/kernel/shell.c

@@ -9,6 +9,7 @@
 #include "../programs/programs.h"
 #include "../libc/crypto.h"
 #include <stdint.h>
+#include "../drivers/rtc.h"
 
 #define BUFFER_SIZE 256
 #define MAX_COMMANDS 16
@@ -19,7 +20,7 @@
 char* ascii_title =
 "\n"
 "----------------------------------------------\n"
-"Blank OS version 0.3.71-dev\n"
+"Blank OS version 0.3.84-alpha\n"
 "Author: @xamidev - star the repo for a cookie!\n"
 "----------------------------------------------\n"
 "\n";
@@ -28,15 +29,23 @@ char* motd[] =
 {
 	"Now in 2D!",
 	"Supercalifragilisticexpialidocious!",
-	"Tylko jedno w głowie mam!",
+	"Tylko jedno w glowie mam!",
 };
 int motd_size = sizeof(motd)/sizeof(motd[0]);
 
 void splash()
-{ // Change that seed to something RTC-related (need RTC driver)
+{ 
-	int random = randint(global_ticks);
+	int random = randint(time_seed());
 	char* motd_pick = motd[random%motd_size];
 	cowsay(motd_pick, red, black);
+	colorputs("        blankOS 0.3.84-alpha", red, black);
+	puts("\n");
+	
+
+	puts("        Time: ");
+	rtc_time_t time;
+	rtc_read_time(&time);
+	print_time(&time);
 	puts("\n");
 }