1 files changed, 110 insertions, 0 deletions
diff --git a/arm7/lib/src/OS_arena.c b/arm7/lib/src/OS_arena.c
new file mode 100644
index 00000000..516fc10b
--- /dev/null
+++ b/arm7/lib/src/OS_arena.c
@@ -0,0 +1,110 @@
+#include "function_target.h"
+#include "consts.h"
+#include "OS_arena.h"
+
+static BOOL OSi_Initialized = FALSE;
+
+extern void SDK_SUBPRIV_ARENA_LO(void);
+extern void SDK_WRAM_ARENA_LO(void);
+extern void SDK_IRQ_STACKSIZE(void);
+extern void SDK_SYS_STACKSIZE(void);
+
+ARM_FUNC void OS_InitArena(void)
+{
+    if (OSi_Initialized)
+    {
+        return;
+    }
+    OSi_Initialized = TRUE;
+
+    OS_SetArenaHi(OS_ARENA_MAIN_SUBPRIV, OS_GetInitArenaHi(OS_ARENA_MAIN_SUBPRIV));
+    OS_SetArenaLo(OS_ARENA_MAIN_SUBPRIV, OS_GetInitArenaLo(OS_ARENA_MAIN_SUBPRIV));
+
+    OS_SetArenaHi(OS_ARENA_WRAM_SUB, OS_GetInitArenaHi(OS_ARENA_WRAM_SUB));
+    OS_SetArenaLo(OS_ARENA_WRAM_SUB, OS_GetInitArenaLo(OS_ARENA_WRAM_SUB));
+
+    OS_SetArenaHi(OS_ARENA_WRAM_SUBPRIV, OS_GetInitArenaHi(OS_ARENA_WRAM_SUBPRIV));
+    OS_SetArenaLo(OS_ARENA_WRAM_SUBPRIV, OS_GetInitArenaLo(OS_ARENA_WRAM_SUBPRIV));
+}
+
+ARM_FUNC void* OS_GetArenaHi(OSArenaId id)
+{
+    return OSi_GetArenaInfo().hi[id];
+}
+
+ARM_FUNC void* OS_GetArenaLo(OSArenaId id)
+{
+    return OSi_GetArenaInfo().lo[id];
+}
+
+ARM_FUNC void* OS_GetInitArenaHi(OSArenaId id)
+{
+    switch (id) {
+        case OS_ARENA_MAIN_SUBPRIV:
+            return (void *)HW_MAIN_MEM_SUB_END;
+        case OS_ARENA_WRAM_SUB:
+            return (void *)HW_WRAM_END;
+        case OS_ARENA_WRAM_SUBPRIV:
+        {
+            u32 irqStackLo = (u32)HW_PRV_WRAM_IRQ_STACK_END - (s32)SDK_IRQ_STACKSIZE;
+            u32 sysStackLo = (u32)HW_PRV_WRAM;
+
+            if ((u32)SDK_WRAM_ARENA_LO > (u32)HW_PRV_WRAM)
+            {
+                sysStackLo = (u32)SDK_WRAM_ARENA_LO;
+            }
+
+            if (!(s32)SDK_SYS_STACKSIZE)
+            {
+                return (void *)sysStackLo;
+            }
+            else if ((s32)SDK_SYS_STACKSIZE < 0)
+            {
+                sysStackLo -= (s32)SDK_SYS_STACKSIZE;
+            }
+            else
+            {
+                sysStackLo = irqStackLo - (s32)SDK_SYS_STACKSIZE;
+            }
+
+            return (void *)sysStackLo;
+        }
+        default:
+            return NULL;
+    }
+}
+
+ARM_FUNC void* OS_GetInitArenaLo(OSArenaId id) {
+    switch (id) {
+        case OS_ARENA_MAIN_SUBPRIV:
+            return (void *)((u32)0x027fafcc); //todo SDK_SUBPRIV_ARENA_LO
+        case OS_ARENA_WRAM_SUB:
+        {
+            u32 wramSubLo = ((u32)SDK_WRAM_ARENA_LO);
+            if ((u32)HW_WRAM_END < (u32)wramSubLo)
+            {
+                wramSubLo = (u32)HW_WRAM_END;
+            }
+            return (void *)wramSubLo;
+        }
+        case OS_ARENA_WRAM_SUBPRIV:
+        {
+            u32 privWramLo = HW_PRV_WRAM;
+            if ((u32)SDK_WRAM_ARENA_LO > (u32)privWramLo)
+            {
+                privWramLo = (u32)SDK_WRAM_ARENA_LO;
+            }
+            return (void *)privWramLo;
+        }
+        default:
+            return NULL;
+    }
+}
+
+ARM_FUNC void OS_SetArenaHi(OSArenaId id, void* newHi) {
+    OSi_GetArenaInfo().hi[id] = newHi;
+}
+
+ARM_FUNC void OS_SetArenaLo(OSArenaId id, void* newLo) {
+    OSi_GetArenaInfo().lo[id] = newLo;
+}