From 449ead1141466c59bb48c242520d58eb8567b318 Mon Sep 17 00:00:00 2001
From: plutoo <plutoo@univor.se>
Date: Sat, 6 Sep 2014 21:07:26 +0200
Subject: [PATCH] os: Added osGetTime().

---
 libctru/include/3ds/os.h |  1 +
 libctru/source/os.c      | 31 +++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/libctru/include/3ds/os.h b/libctru/include/3ds/os.h
index c267590..92e6483 100644
--- a/libctru/include/3ds/os.h
+++ b/libctru/include/3ds/os.h
@@ -7,3 +7,4 @@ u32 osConvertVirtToPhys(u32 vaddr);
 const char* osStrError(u32 error);
 u32 osGetFirmVersion();
 u32 osGetKernelVersion();
+u64 osGetTime();
diff --git a/libctru/source/os.c b/libctru/source/os.c
index f09bf24..84431bf 100644
--- a/libctru/source/os.c
+++ b/libctru/source/os.c
@@ -1,5 +1,21 @@
 #include <3ds.h>
 
+#define TICKS_PER_MSEC 268123.480
+
+typedef struct {
+	u64 date_time;
+	u64 update_tick;
+	//...
+} datetime_t;
+
+static volatile u32* __datetime_selector =
+	(u32*) 0x1FF81000;
+static volatile datetime_t* __datetime1 =
+	(datetime_t*) 0x1FF81020;
+static volatile datetime_t* __datetime2 =
+	(datetime_t*) 0x1FF81040;
+
+
 u32 osConvertVirtToPhys(u32 vaddr)
 {
 	if(vaddr >= 0x14000000 && vaddr < 0x1c000000)
@@ -13,6 +29,21 @@ u32 osConvertVirtToPhys(u32 vaddr)
 	return 0;
 }
 
+// Returns number of milliseconds since 1st Jan 1900 00:00.
+u64 osGetTime() {
+	volatile datetime_t* dt;
+
+	switch(*__datetime_selector & 1) {
+	case 0:
+		dt = __datetime1;
+	case 1:
+		dt = __datetime2;
+	}
+
+	u64 offset = (svcGetSystemTick() - dt->update_tick) / TICKS_PER_MSEC;
+	return dt->date_time + offset;
+}
+
 u32 osGetFirmVersion() {
 	return (*(u32*)0x1FF80000) & ~0xFF;
 }