From 7b75929b9415646b25d9211975556f5466024a94 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Tue, 11 Jul 2023 01:19:58 +0300
Subject: [PATCH] some openbios support

slowboot isn't working yet, doesn't work at all with lightrec,
openbios-fastboot doesn't work with ari64
---
 frontend/libretro.c     |  6 ------
 frontend/menu.c         |  7 ++++---
 libpcsxcore/misc.c      | 26 ++++++++++++++++----------
 libpcsxcore/misc.h      |  3 +++
 libpcsxcore/psxcommon.c |  1 +
 libpcsxcore/psxcommon.h |  4 +---
 libpcsxcore/r3000a.c    | 15 +++++++++++++--
 7 files changed, 38 insertions(+), 24 deletions(-)

diff --git a/frontend/libretro.c b/frontend/libretro.c
index 84baeda8..5acaba8b 100644
--- a/frontend/libretro.c
+++ b/frontend/libretro.c
@@ -2708,12 +2708,6 @@ void retro_run(void)
    {
       rebootemu = 0;
       SysReset();
-      if (!Config.HLE && !Config.SlowBoot)
-      {
-         // skip BIOS logos
-         psxRegs.pc = psxRegs.GPR.n.ra;
-      }
-      return;
    }
 
    print_internal_fps();
diff --git a/frontend/menu.c b/frontend/menu.c
index 9ca87c60..f78d3d26 100644
--- a/frontend/menu.c
+++ b/frontend/menu.c
@@ -2011,9 +2011,6 @@ static int reset_game(void)
 	ClosePlugins();
 	OpenPlugins();
 	SysReset();
-	if (CheckCdrom() != -1) {
-		LoadCdrom();
-	}
 	return 0;
 }
 
@@ -2042,13 +2039,17 @@ static int reload_plugins(const char *cdimg)
 
 static int run_bios(void)
 {
+	boolean origSlowBoot = Config.SlowBoot;
+
 	if (bios_sel == 0)
 		return -1;
 
 	ready_to_go = 0;
 	if (reload_plugins(NULL) != 0)
 		return -1;
+	Config.SlowBoot = 1;
 	SysReset();
+	Config.SlowBoot = origSlowBoot;
 
 	ready_to_go = 1;
 	return 0;
diff --git a/libpcsxcore/misc.c b/libpcsxcore/misc.c
index 57d3959f..022ad6d9 100644
--- a/libpcsxcore/misc.c
+++ b/libpcsxcore/misc.c
@@ -22,6 +22,7 @@
 */
 
 #include <stddef.h>
+#include <assert.h>
 #include "misc.h"
 #include "cdrom.h"
 #include "mdec.h"
@@ -154,7 +155,7 @@ static const unsigned int gpu_data_def[] = {
 	0x02000000, 0x00000000, 0x01ff03ff,
 };
 
-static void fake_bios_gpu_setup(void)
+void BiosLikeGPUSetup()
 {
 	int i;
 
@@ -177,6 +178,14 @@ static void SetBootRegs(u32 pc, u32 gp, u32 sp)
 	psxCpu->Notify(R3000ACPU_NOTIFY_AFTER_LOAD, NULL);
 }
 
+void BiosBootBypass() {
+	assert(psxRegs.pc == 0x80030000);
+
+	// skip BIOS logos and region check
+	psxCpu->Notify(R3000ACPU_NOTIFY_BEFORE_SAVE, NULL);
+	psxRegs.pc = psxRegs.GPR.n.ra;
+}
+
 int LoadCdrom() {
 	EXE_HEADER tmpHead;
 	struct iso_directory_record *dir;
@@ -184,15 +193,10 @@ int LoadCdrom() {
 	u8 mdir[4096];
 	char exename[256];
 
-	// not the best place to do it, but since BIOS boot logo killer
-	// is just below, do it here
-	fake_bios_gpu_setup();
-
-	if (!Config.HLE && !Config.SlowBoot) {
-		// skip BIOS logos
-		psxCpu->Notify(R3000ACPU_NOTIFY_BEFORE_SAVE, NULL);
-		psxRegs.pc = psxRegs.GPR.n.ra;
-		return 0;
+	if (!Config.HLE) {
+		if (!BiosBooted) return 0;              // custom BIOS
+		if (psxRegs.pc != 0x80030000) return 0; // BiosBootBypass'ed
+		if (Config.SlowBoot) return 0;
 	}
 
 	time[0] = itob(0); time[1] = itob(2); time[2] = itob(0x10);
@@ -210,6 +214,7 @@ int LoadCdrom() {
 	if (GetCdromFile(mdir, time, "SYSTEM.CNF;1") == -1) {
 		// if SYSTEM.CNF is missing, start an existing PSX.EXE
 		if (GetCdromFile(mdir, time, "PSX.EXE;1") == -1) return -1;
+		strcpy(exename, "PSX.EXE;1");
 
 		READTRACK();
 	}
@@ -243,6 +248,7 @@ int LoadCdrom() {
 
 	memcpy(&tmpHead, buf + 12, sizeof(EXE_HEADER));
 
+	SysPrintf("manual booting '%s'\n", exename);
 	SetBootRegs(SWAP32(tmpHead.pc0), SWAP32(tmpHead.gp0), SWAP32(tmpHead.s_addr));
 
 	tmpHead.t_size = SWAP32(tmpHead.t_size);
diff --git a/libpcsxcore/misc.h b/libpcsxcore/misc.h
index ae3fc81f..da99885a 100644
--- a/libpcsxcore/misc.h
+++ b/libpcsxcore/misc.h
@@ -56,6 +56,9 @@ typedef struct {
 extern char CdromId[10];
 extern char CdromLabel[33];
 
+void BiosLikeGPUSetup();
+void BiosBootBypass();
+
 int LoadCdrom();
 int LoadCdromFile(const char *filename, EXE_HEADER *head);
 int CheckCdrom();
diff --git a/libpcsxcore/psxcommon.c b/libpcsxcore/psxcommon.c
index 8313304c..fcc3debf 100644
--- a/libpcsxcore/psxcommon.c
+++ b/libpcsxcore/psxcommon.c
@@ -26,6 +26,7 @@
 
 PcsxConfig Config;
 boolean NetOpened = FALSE;
+boolean BiosBooted = FALSE;
 
 int Log = 0;
 FILE *emuLog = NULL;
diff --git a/libpcsxcore/psxcommon.h b/libpcsxcore/psxcommon.h
index b621326c..67a0ae08 100644
--- a/libpcsxcore/psxcommon.h
+++ b/libpcsxcore/psxcommon.h
@@ -150,13 +150,11 @@ typedef struct {
 		boolean cdr_read_timing;
 		boolean gpu_slow_list_walking;
 	} hacks;
-#ifdef _WIN32
-	char Lang[256];
-#endif
 } PcsxConfig;
 
 extern PcsxConfig Config;
 extern boolean NetOpened;
+extern boolean BiosBooted;
 
 struct PcsxSaveFuncs {
 	void *(*open)(const char *name, const char *mode);
diff --git a/libpcsxcore/r3000a.c b/libpcsxcore/r3000a.c
index 8b7cfbf7..53a5ebac 100644
--- a/libpcsxcore/r3000a.c
+++ b/libpcsxcore/r3000a.c
@@ -67,8 +67,14 @@ void psxReset() {
 	psxHwReset();
 	psxBiosInit();
 
-	if (!Config.HLE)
+	BiosLikeGPUSetup(); // a bit of a hack but whatever
+
+	BiosBooted = FALSE;
+	if (!Config.HLE) {
 		psxExecuteBios();
+		if (psxRegs.pc == 0x80030000 && !Config.SlowBoot)
+			BiosBootBypass();
+	}
 
 #ifdef EMU_LOG
 	EMU_LOG("*BIOS END*\n");
@@ -237,7 +243,12 @@ void psxJumpTest() {
 }
 
 void psxExecuteBios() {
-	while (psxRegs.pc != 0x80030000)
+	int i;
+	for (i = 0; psxRegs.pc != 0x80030000 && i < 5000000; i++)
 		psxCpu->ExecuteBlock();
+	if (psxRegs.pc == 0x80030000)
+		BiosBooted = TRUE;
+	else
+		SysPrintf("BIOS boot timeout - custom BIOS?\n");
 }
 
-- 
2.39.5