From 411b1a3d7dcc8c1d265bea77e4b2527909482db7 Mon Sep 17 00:00:00 2001
From: Lephe <sebastien.michelland@protonmail.com>
Date: Mon, 24 Feb 2025 19:41:28 +0100
Subject: [PATCH] kernel: get arenas from MPM load info

---
 src/kernel/kernel.c | 33 ++++++++++++++++++++++++++++++++-
 src/kernel/kernel.h |  4 +++-
 src/kernel/start.c  | 16 ++++++++--------
 3 files changed, 43 insertions(+), 10 deletions(-)

diff --git a/src/kernel/kernel.c b/src/kernel/kernel.c
index 7ef15eb..dffd482 100644
--- a/src/kernel/kernel.c
+++ b/src/kernel/kernel.c
@@ -33,13 +33,17 @@ uint8_t *gint_driver_flags = NULL;
 /* Top of the stack */
 void *gint_stack_top = NULL;
 
+u32 *gint_load_info = NULL;
+
 //---
 //	Initialization and unloading
 //---
 
 /* kinit(): Install and start gint */
-void kinit(void)
+void kinit(u32 *load_info)
 {
+	gint_load_info = load_info;
+
 	/* Figure out which CASIOWIN API to use based on the OS type. */
 	#if GINT_OS_CG
 	char *version = (void *)0x80020020;
@@ -134,6 +138,33 @@ void kinit(void)
 	}
 	#endif
 
+	/* Create arenas in locations provided by loader */
+	#if GINT_OS_CG
+	u32 load_arena_start = 0;
+	char const *names[4] = { "_ld1", "_ld2", "_ld3", "_ld4" };
+	int count = 0;
+	for(int i = 0; load_info && load_info[i] && count < 4; i += 2)
+	{
+		if(load_info[i] == 0x00000010)
+			load_arena_start = load_info[i+1];
+		else if(load_info[i] == 0x00000011 && load_arena_start)
+		{
+			u32 load_arena_end = load_info[i+1];
+			kmalloc_arena_t *arena = kmalloc(sizeof *arena, NULL);
+			if(arena)
+			{
+				arena->name = names[count];
+				arena->is_default = true;
+				arena->start = (void *)load_arena_start;
+				arena->end = (void *)load_arena_end;
+				kmalloc_init_arena(arena, true);
+				kmalloc_add_arena(arena);
+			}
+			load_arena_start = 0;
+		}
+	}
+	#endif
+
 	/* Allocate world buffers for the OS and for gint */
 	gint_world_os = gint_world_alloc();
 	gint_world_addin = gint_world_alloc();
diff --git a/src/kernel/kernel.h b/src/kernel/kernel.h
index a5b5952..717345b 100644
--- a/src/kernel/kernel.h
+++ b/src/kernel/kernel.h
@@ -5,6 +5,8 @@
 #ifndef GINT_CORE_KERNEL
 #define GINT_CORE_KERNEL
 
+#include <gint/defs/types.h>
+
 /* gint_load_onchip_sections(): Initialize on-chip memory sections */
 void gint_load_onchip_sections(void);
 
@@ -13,7 +15,7 @@ void gint_load_onchip_sections(void);
 void gint_copy_vram(void);
 
 /* kinit(): Install and start gint */
-void kinit(void);
+void kinit(u32 *load_info);
 
 /* kquit(): Quit gint and give back control to the system */
 void kquit(void);
diff --git a/src/kernel/start.c b/src/kernel/start.c
index 5159a92..bd0fc9e 100644
--- a/src/kernel/start.c
+++ b/src/kernel/start.c
@@ -109,7 +109,7 @@ void gint_load_onchip_sections(void)
 	}
 }
 
-static int start2(int isappli, int optnum)
+static int start2(int load_type, u32 *load_info)
 {
 	/* We are currently in a dynamic userspace mapping of an add-in run
 	   from the storage memory. We are running in privileged mode with one
@@ -174,8 +174,11 @@ static int start2(int isappli, int optnum)
 	}
 	#endif
 
-	/* Install gint, switch VBR and initialize drivers */
-	kinit();
+	/* Install gint, switch VBR and initialize drivers. If loading information
+	   was provided, pass it on. */
+	if(load_type == 0x4d504d30 /* 'MPM0' */ && !((u32)load_info & 3)) {}
+	else load_info = NULL;
+	kinit(load_info);
 
 	/* We are now running on our own in kernel mode. Since we have taken
 	   control of interrupts, pretty much any interaction with the system
@@ -190,9 +193,6 @@ static int start2(int isappli, int optnum)
 	   what it wants in exit() after main() finishes executing */
 	if(!setjmp(gint_exitbuf)) {
 		callarray(&bctors, &ectors);
-		// TODO: record isappli and optnum in globals
-		(void)isappli;
-		(void)optnum;
 		exit(main());
 	}
 	else {
@@ -211,11 +211,11 @@ static int start2(int isappli, int optnum)
 }
 
 GSECTION(".text.entry")
-int start(int isappli, int optnum)
+int start(int load_type, u32 *load_info)
 {
 	int rc;
 	while(1) {
-		rc = start2(isappli, optnum);
+		rc = start2(load_type, load_info);
 		if(!gint_restart) break;
 		gint_osmenu_native();
 	}