Added time RTC library

kernel/libc/Makefile

@@ -1,4 +1,4 @@
-OBJS = stdio.o string.o assert.o
+OBJS = stdio.o string.o assert.o time.o
 
 CC = i686-elf-gcc # cross-compiler
 CFLAGS = -m32 -fno-stack-protector -ffreestanding -Wall -Wextra -Werror -g -c
@@ -7,4 +7,4 @@ CFLAGS = -m32 -fno-stack-protector -ffreestanding -Wall -Wextra -Werror -g -c
 all:${OBJS}
 
 %.o: %.c
-	$(CC) $(CFLAGS) $< -o $@
+	$(CC) $(CFLAGS) $< -o $@

kernel/libc/assert.h

@@ -1,7 +1,7 @@
 /**************************************
- *          iceOS Kernel              *
+ *          VulcanOS Kernel           *
  * Developed by Marco 'icebit' Cetica * 
- *            (c) 2019                *
+ *            (c) 2019-2021           *
  *       Released under GPLv3         *
  * https://github.com/ice-bit/iceOS   *
  ***************************************/
@@ -18,4 +18,4 @@
 extern void panic(const char *message, const char *file, uint32_t line);
 extern void panic_assert(const char *file, uint32_t line, const char *desc);
 
-#endif
+#endif

kernel/libc/stdio.h

@@ -1,11 +1,10 @@
 /**************************************
- *          iceOS Kernel              *
+ *          VulcanOS Kernel           *
  * Developed by Marco 'icebit' Cetica * 
- *            (c) 2019                *
+ *            (c) 2019-2021           *
  *       Released under GPLv3         *
  * https://github.com/ice-bit/iceOS   *
  ***************************************/
-
 #ifndef _STDIO_H_
 #define _STDIO_H_
 
@@ -17,4 +16,4 @@ int printf(const char *format, ...);
 int printf_color(const char *format, uint8_t fg, uint8_t bg); // Only for string for now
 void puts(const char *buf);
 
-#endif
+#endif

kernel/libc/string.h

@@ -1,11 +1,10 @@
 /**************************************
- *          iceOS Kernel              *
+ *          VulcanOS Kernel           *
  * Developed by Marco 'icebit' Cetica * 
- *            (c) 2019                *
+ *            (c) 2019-2021           *
  *       Released under GPLv3         *
  * https://github.com/ice-bit/iceOS   *
  ***************************************/
-
 #ifndef _STRING_H_
 #define _STRING_H_
 

kernel/libc/time.c

@@ -0,0 +1,38 @@
+#include "time.h"
+#include "../drivers/ports.h"
+
+// Check whether CMOS is updated or not
+static uint8_t is_cmos_updated() {
+    outb(CMOS_ADDRESS, 0x0A);
+    
+    return (inb(CMOS_DATA) & 0x80);
+}
+
+// Get CMOS register's status
+static uint8_t reg_status(int32_t reg) {
+    outb(CMOS_ADDRESS, reg);
+    
+    return inb(CMOS_DATA);
+}
+
+
+time_t cmos_reader() {
+    while(is_cmos_updated()); // Wait until the CMOS is being updated
+    
+    time_t tm;
+
+    tm.second = BCD_CONVERTER(reg_status(TIME_R_SECOND));
+    tm.minute = BCD_CONVERTER(reg_status(TIME_R_MINUTE));
+    tm.hour = BCD_CONVERTER(reg_status(TIME_R_HOUR));
+    tm.day = BCD_CONVERTER(reg_status(TIME_R_DAY));
+    tm.month = BCD_CONVERTER(reg_status(TIME_R_MONTH));
+    tm.year = BCD_CONVERTER(reg_status(TIME_R_YEAR));
+
+    return tm;
+}
+
+uint32_t get_time(uint32_t field) {
+    while(is_cmos_updated()); // Wait the CMOS is being updated
+
+    return BCD_CONVERTER(reg_status(field));
+}

kernel/libc/time.h

@@ -0,0 +1,42 @@
+/**************************************
+ *          VulcanOS Kernel           *
+ * Developed by Marco 'icebit' Cetica * 
+ *            (c) 2019-2021           *
+ *       Released under GPLv3         *
+ * https://github.com/ice-bit/iceOS   *
+ ***************************************/
+/* Get time reading the RTC(real time clock) CMOS on the motherboard */
+#ifndef TIME_H
+#define TIME_H
+
+#include <stdint.h>
+
+// Define RTC field registers
+#define TIME_R_YEAR 0x09
+#define TIME_R_MONTH 0x08
+#define TIME_R_DAY 0x07
+#define TIME_R_HOUR 0x06
+#define TIME_R_MINUTE 0x05
+#define TIME_R_SECOND 0x04
+//#define TIME_R_CENTURY 0x32 
+
+// Define RTC address
+#define CMOS_ADDRESS 0x70
+#define CMOS_DATA 0x71
+
+// Convert BCD encoed values to binary
+#define BCD_CONVERTER(n) ((n / 16) * 10 + (n & 0xF))
+
+typedef struct {
+    uint8_t second;
+    uint8_t minute;
+    uint8_t hour;
+    uint8_t day;
+    uint8_t month;
+    uint8_t year;
+} time_t;
+
+time_t cmos_reader();
+uint32_t get_time(uint32_t field);
+
+#endif