From 5bf562688e3738d347a51a72967e29836f8be65a Mon Sep 17 00:00:00 2001
From: retro-wertz <retro-wertz@users.noreply.github.com>
Date: Sun, 10 Mar 2019 22:19:59 +0800
Subject: [PATCH] Fix memcard2 still detected by games when its supposed to be
 disabled

---
 frontend/libretro.c   | 19 +++++++++++--------
 libpcsxcore/psxbios.c | 27 +++++++++++++++++++++++++--
 libpcsxcore/sio.c     |  6 ++++++
 libpcsxcore/sio.h     |  1 +
 4 files changed, 43 insertions(+), 10 deletions(-)

diff --git a/frontend/libretro.c b/frontend/libretro.c
index 7eb8480d..838e4491 100644
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -819,7 +819,7 @@ void retro_cheat_set(unsigned index, bool enabled, const char *code)
 	// cheat funcs are destructive, need a copy..
 	strncpy(buf, code, sizeof(buf));
 	buf[sizeof(buf) - 1] = 0;
-	
+
 	//Prepare buffered cheat for PCSX's AddCheat fucntion.
 	int cursor=0;
 	int nonhexdec=0;
@@ -833,7 +833,7 @@ void retro_cheat_set(unsigned index, bool enabled, const char *code)
 		}
 		cursor++;
 	}
-	
+
 
 	if (index < NumCheats)
 		ret = EditCheat(index, "", buf);
@@ -1581,7 +1581,7 @@ static void update_variables(bool in_flight)
    }
    else{
       //not yet running
-      
+
       //bootlogo display hack
       if (found_bios) {
          var.value = "NULL";
@@ -1881,9 +1881,12 @@ static int init_memcards(void)
 	struct retro_variable var = { .key="pcsx_rearmed_memcard2", .value=NULL };
 	static const char CARD2_FILE[] = "pcsx-card2.mcd";
 
-	McdDisable[0] = 0;
-	// Disable memcard 2 by default
-	McdDisable[1] = 1;
+	// Memcard2 will be handled and is re-enabled if needed using core
+	// operations.
+	// Memcard1 is handled by libretro, doing this will set core to
+	// skip file io operations for memcard1 like SaveMcd
+	snprintf(Config.Mcd1, sizeof(Config.Mcd1), "none");
+	snprintf(Config.Mcd2, sizeof(Config.Mcd2), "none");
 	init_memcard(Mcd1Data);
 	// Memcard 2 is managed by the emulator on the filesystem,
 	// There is no need to initialize Mcd2Data like Mcd1Data.
@@ -1987,7 +1990,7 @@ void retro_init(void)
    psxUnmapHook = pl_vita_munmap;
 #endif
 	ret = emu_core_preinit();
-#ifdef _3DS 
+#ifdef _3DS
    /* emu_core_preinit sets the cpu to dynarec */
    if(!__ctr_svchax)
       Config.Cpu = CPU_INTERPRETER;
@@ -2007,7 +2010,7 @@ void retro_init(void)
 #else
 	vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
 #endif
-  
+
 	vout_buf_ptr = vout_buf;
 
 	loadPSXBios();
diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index d5ed7253..a6846017 100644
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -26,6 +26,7 @@
 #include "psxbios.h"
 #include "psxhw.h"
 #include "gpu.h"
+#include "sio.h"
 #include <zlib.h>
 
 #undef SysPrintf
@@ -261,7 +262,7 @@ static int CardState = -1;
 static TCB Thread[8];
 static int CurThread = 0;
 static FileDesc FDesc[32];
-static u32 card_active_chan;
+static u32 card_active_chan = 0;
 
 boolean hleSoftCall = FALSE;
 
@@ -1271,14 +1272,35 @@ void psxBios_SetMem() { // 9f
 }
 
 void psxBios__card_info() { // ab
+	u8 ret, port;
 #ifdef PSXBIOS_LOG
 	PSXBIOS_LOG("psxBios_%s: %x\n", biosA0n[0xab], a0);
 #endif
 
 	card_active_chan = a0;
+	port = card_active_chan >> 4;
+
+	switch (port) {
+	case 0x0:
+	case 0x1:
+		ret = 0x2;
+		if (McdDisable[port & 1])
+			ret = 0x8;
+		break;
+	default:
+#ifdef PSXBIOS_LOG
+		PSXBIOS_LOG("psxBios_%s: UNKNOWN PORT 0x%x\n", biosA0n[0xab], card_active_chan);
+#endif
+		ret = 0x11;
+		break;
+	}
+
+	if (McdDisable[0] && McdDisable[1])
+		ret = 0x8;
 
 //	DeliverEvent(0x11, 0x2); // 0xf0000011, 0x0004
-	DeliverEvent(0x81, 0x2); // 0xf4000001, 0x0004
+//	DeliverEvent(0x81, 0x2); // 0xf4000001, 0x0004
+	DeliverEvent(0x81, ret); // 0xf4000001, 0x0004
 
 	v0 = 1; pc0 = ra;
 }
@@ -2643,6 +2665,7 @@ void psxBiosInit() {
 	CardState = -1;
 	CurThread = 0;
 	memset(FDesc, 0, sizeof(FDesc));
+	card_active_chan = 0;
 
 	psxMu32ref(0x0150) = SWAPu32(0x160);
 	psxMu32ref(0x0154) = SWAPu32(0x320);
diff --git a/libpcsxcore/sio.c b/libpcsxcore/sio.c
index d251fa74..c2390bf0 100644
--- a/libpcsxcore/sio.c
+++ b/libpcsxcore/sio.c
@@ -423,6 +423,12 @@ void LoadMcd(int mcd, char *str) {
 	}
 
 	McdDisable[mcd - 1] = 0;
+#ifdef HAVE_LIBRETRO
+	// memcard1 is handled by libretro
+	if (mcd == 1)
+		return;
+#endif
+
 	if (str == NULL || strcmp(str, "none") == 0) {
 		McdDisable[mcd - 1] = 1;
 		return;
diff --git a/libpcsxcore/sio.h b/libpcsxcore/sio.h
index eff1746a..a554c2bb 100644
--- a/libpcsxcore/sio.h
+++ b/libpcsxcore/sio.h
@@ -34,6 +34,7 @@ extern "C" {
 #define MCD_SIZE	(1024 * 8 * 16)
 
 extern char Mcd1Data[MCD_SIZE], Mcd2Data[MCD_SIZE];
+extern char McdDisable[2];
 
 void sioWrite8(unsigned char value);
 void sioWriteStat16(unsigned short value);
-- 
2.39.5