Get the correct time

Makefile

@@ -61,7 +61,7 @@ INCLUDES	:=	source
 #---------------------------------------------------------------------------------
 CFLAGS		=	-g -ggdb -O3 -Wall -Wno-multichar -Wno-unused-parameter -Wextra $(MACHDEP) $(INCLUDE) -D_GNU_SOURCE
 CXXFLAGS	=	$(CFLAGS)
-LDFLAGS		=	-g -ggdb $(MACHDEP) -Wl,-Map,$(notdir $@).map,--section-start,.init=0x80B00000,-wrap,malloc,-wrap,free,-wrap,memalign,-wrap,calloc,-wrap,realloc,-wrap,malloc_usable_size
+LDFLAGS		=	-g -ggdb $(MACHDEP) -Wl,-Map,$(notdir $@).map,--section-start,.init=0x80B00000,-wrap,malloc,-wrap,free,-wrap,memalign,-wrap,calloc,-wrap,realloc,-wrap,malloc_usable_size,-wrap,time
 
 ifeq ($(BUILDMODE),channel)
 CFLAGS += -DFULLCHANNEL

source/utils/time.c

@@ -0,0 +1,96 @@
+/*
+	Time functions were changed within libogc in 2018.
+	Since then some Wii systems return the incorrect time.
+*/
+
+#include <ogc/conf.h>
+#include <ogc/exi.h>
+#include <time.h>
+
+static u32 getrtc(u32 *gctime)
+{
+	u32 ret = 0, time = 0, cmd = 0x20000000;
+
+	if (EXI_Lock(EXI_CHANNEL_0, EXI_DEVICE_1, NULL) == 0)
+		return 0;
+	if (EXI_Select(EXI_CHANNEL_0, EXI_DEVICE_1, EXI_SPEED8MHZ) == 0)
+	{
+		EXI_Unlock(EXI_CHANNEL_0);
+		return 0;
+	}
+
+	if (EXI_Imm(EXI_CHANNEL_0, &cmd, 4, EXI_WRITE, NULL) == 0)
+		ret |= 0x01;
+	if (EXI_Sync(EXI_CHANNEL_0) == 0)
+		ret |= 0x02;
+	if (EXI_Imm(EXI_CHANNEL_0, &time, 4, EXI_READ, NULL) == 0)
+		ret |= 0x04;
+	if (EXI_Sync(EXI_CHANNEL_0) == 0)
+		ret |= 0x08;
+	if (EXI_Deselect(EXI_CHANNEL_0) == 0)
+		ret |= 0x10;
+
+	EXI_Unlock(EXI_CHANNEL_0);
+	*gctime = time;
+	if (ret)
+		return 0;
+
+	return 1;
+}
+
+u32 SYS_GetRTC(u32 *gctime)
+{
+	u32 cnt = 0, ret = 0;
+	u32 time1, time2;
+
+	while (cnt < 16)
+	{
+		if (getrtc(&time1) == 0)
+			ret |= 0x01;
+		if (getrtc(&time2) == 0)
+			ret |= 0x02;
+		if (ret)
+			return 0;
+		if (time1 == time2)
+		{
+			*gctime = time1;
+			return 1;
+		}
+		cnt++;
+	}
+	return 0;
+}
+
+time_t __wrap_time(time_t *timer)
+{
+	u32 gctime = 0, bias = 0;
+
+	if (SYS_GetRTC((u32 *)&gctime) == 0)
+		return (time_t)0;
+	if (CONF_GetCounterBias(&bias) >= 0)
+		gctime += bias;
+	gctime += 946684800;
+	if (timer)
+		*timer = gctime;
+	return gctime;
+}
+
+/*
+// This function returns the wrong time on a Brazilian Wii (4.3U)
+// Reported by Walwii @ GBAtemp.net
+time_t __wrap_time(time_t *timer)
+{
+	time_t gctime;
+	u32 rtctime = 0, bias = 0;
+
+	if (SYS_GetRTC(&rtctime) == 0)
+		return (time_t)0;
+	gctime = rtctime;
+	if (CONF_GetCounterBias(&bias) >= 0)
+		gctime += bias;
+	gctime += 946684800;
+	if (timer)
+		*timer = gctime;
+	return gctime;
+}
+*/