Calculate the boot timestamp in UNIX time for further usage

kernel/src/arch/Timer.cpp

@@ -1,8 +1,58 @@
 #include "arch/Timer.h"
+#include "arch/Serial.h"
+#include "boot/bootboot.h"
+#include <Result.h>
 
 static u64 timer_ticks = 0;
 static u64 boot_timestamp;
 
+static int isleap(int year)
+{
+    return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
+}
+
+static int make_yday(int year, int month)
+{
+    static const short int upto[12] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
+    int yd;
+
+    yd = upto[month - 1];
+    if (month > 2 && isleap(year)) yd++;
+    return yd;
+}
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_16
+static u64 broken_down_to_unix(u64 year, u64 yday, u64 hour, u64 min, u64 sec)
+{
+    return sec + min * 60 + hour * 3600 + yday * 86400 + (year - 70) * 31536000 + ((year - 69) / 4) * 86400 -
+           ((year - 1) / 100) * 86400 + ((year + 299) / 400) * 86400;
+}
+
+// The bootloader encodes the date and time in Binary-Coded Decimal (BCD), which represents decimal digits using
+// hexadecimal digits. For example, BCD 0x22 is 22 in decimal.
+// https://gitlab.com/bztsrc/bootboot/-/blob/master/bootboot_spec_1st_ed.pdf, page 15.
+static int bcd_number_to_decimal(int num)
+{
+    return ((num >> 4) * 10) + (num & 0xf);
+}
+
+static u64 bootloader_time_to_unix(u8 boottime[8])
+{
+    int year = bcd_number_to_decimal(boottime[0]) * 100 + bcd_number_to_decimal(boottime[1]);
+    int month = bcd_number_to_decimal(boottime[2]);
+    int day = bcd_number_to_decimal(boottime[3]);
+    int hour = bcd_number_to_decimal(boottime[4]);
+    int minute = bcd_number_to_decimal(boottime[5]);
+    int second = bcd_number_to_decimal(boottime[6]);
+    // "The last byte can store 1/100th second precision, but in lack of support on most platforms, it is 0x00".
+    // Therefore, let's not rely on it.
+    Serial::printf("Current time: %.2d/%.2d/%d %.2d:%.2d:%.2d UTC\n", day, month, year, hour, minute, second)
+        .release_value();
+    return broken_down_to_unix(year - 1900, make_yday(year, month) + (day - 1), hour, minute, second);
+}
+
+extern BOOTBOOT bootboot;
+
 namespace Timer
 {
     void tick()
@@ -75,6 +125,7 @@ namespace Timer
 
     void init()
     {
+        boot_timestamp = bootloader_time_to_unix(bootboot.datetime);
         arch_init();
     }
 }

luna/String.cpp

@@ -2,19 +2,19 @@
 
 extern "C"
 {
-    void* memcpy(void* dest, const void* src, size_t n)
+    void* memcpy(void* dest, const void* src, usize n)
     {
-        for (size_t i = 0; i < n; ++i) { *((u8*)dest + i) = *((const u8*)src + i); }
+        for (usize i = 0; i < n; ++i) { *((u8*)dest + i) = *((const u8*)src + i); }
         return dest;
     }
 
-    void* memset(void* buf, int c, size_t n)
+    void* memset(void* buf, int c, usize n)
     {
-        for (size_t i = 0; i < n; ++i) { *((u8*)buf + i) = (u8)c; }
+        for (usize i = 0; i < n; ++i) { *((u8*)buf + i) = (u8)c; }
         return buf;
     }
 
-    int memcmp(const void* a, const void* b, size_t n)
+    int memcmp(const void* a, const void* b, usize n)
     {
         if (!n) return 0;
         const u8* ap = (const u8*)a;
@@ -27,7 +27,7 @@ extern "C"
         return *ap - *bp;
     }
 
-    void* memmove(void* dest, const void* src, size_t n)
+    void* memmove(void* dest, const void* src, usize n)
     {
         if (dest == src) return dest;
         if (dest > src)
@@ -37,7 +37,7 @@ extern "C"
         return dest;
     }
 
-    size_t strlen(const char* str)
+    usize strlen(const char* str)
     {
         const char* i = str;
         for (; *i; ++i)

luna/String.h

@@ -3,9 +3,9 @@
 
 extern "C"
 {
-    void* memcpy(void* dest, const void* src, size_t n);
+    void* memcpy(void* dest, const void* src, usize n);
-    void* memset(void* buf, int c, size_t n);
+    void* memset(void* buf, int c, usize n);
-    int memcmp(const void* a, const void* b, size_t n);
+    int memcmp(const void* a, const void* b, usize n);
-    void* memmove(void* dest, const void* src, size_t n);
+    void* memmove(void* dest, const void* src, usize n);
-    size_t strlen(const char* str);
+    usize strlen(const char* str);
 }

tools/check-formatting.sh

@@ -5,6 +5,7 @@ source $(dirname $0)/env.sh
 cd $LUNA_ROOT
 
 SOURCES=($(find kernel/src -type f | grep -v "\.asm"))
+SOURCES+=($(find luna -type f | grep -v "CMakeLists.txt"))
 
 ALL_OK=1
 

tools/replace-stdint.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+set -e
+source $(dirname $0)/env.sh
+
+cd $LUNA_ROOT
+
+SOURCES=($(find kernel/src -type f | grep -v "\.asm" | grep -v "bootboot.h"))
+SOURCES+=($(find luna -type f | grep -v "CMakeLists.txt" | grep -v "Types.h" | grep -v "PlacementNew.h"))
+
+for f in ${SOURCES[@]}
+do
+    sed -i 's/uint8_t/u8/g' $f
+    sed -i 's/uint16_t/u16/g' $f
+    sed -i 's/uint32_t/u32/g' $f
+    sed -i 's/uint64_t/u64/g' $f
+
+    sed -i 's/int8_t/i8/g' $f
+    sed -i 's/int16_t/i16/g' $f
+    sed -i 's/int32_t/i32/g' $f
+    sed -i 's/int64_t/i64/g' $f
+
+    sed -i 's/size_t/usize/g' $f
+    sed -i 's/ssize_t/isize/g' $f
+done

tools/run-clang-format.sh

@@ -6,6 +6,7 @@ source $(dirname $0)/env.sh
 cd $LUNA_ROOT
 
 SOURCES=($(find kernel/src -type f | grep -v "\.asm"))
+SOURCES+=($(find luna -type f | grep -v "CMakeLists.txt"))
 
 for f in ${SOURCES[@]}
 do