Initial commit

arm9/source/core/Environment.cpp

@@ -0,0 +1,64 @@
+#include <nds.h>
+#include "picoAgbAdapter.h"
+#include "Environment.h"
+
+u32 Environment::_flags;
+
+static bool detectIsNitroEmulator()
+{
+    u32 agbMemoryAddress = *(vu32*)0x027FFF7C;
+    if (agbMemoryAddress < 0x08000000 || agbMemoryAddress >= 0x0A000000)
+        return false;
+    u32 monitorRomLoadAddress = *(vu32*)0x027FFF68;
+    if (monitorRomLoadAddress < 0x02000000 || monitorRomLoadAddress >= 0x02800000)
+        return false;
+    return true;
+}
+
+static bool detectNocashPrintSuppport()
+{
+    vu8* identifier = (vu8*)0x04FFFA00;
+    // melon ds only seems to implement this for 8 bit reads
+    u32 nocashIdentifier = identifier[0] | (identifier[1] << 8) | (identifier[2] << 16) | (identifier[3] << 24);
+    return nocashIdentifier == 0x67246F6E // no$g
+        || nocashIdentifier == 0x6F6C656D; // melo
+}
+
+static bool detectPicoAgbAdapter()
+{
+    REG_EXMEMCNT &= ~0xFF;
+    return PICO_AGB_IDENTIFIER == PICO_AGB_IDENTIFIER_VALUE;
+}
+
+void Environment::Initialize()
+{
+    _flags = ENVIRONMENT_FLAGS_NONE;
+    if (isDSiMode())
+    {
+        _flags |= ENVIRONMENT_FLAGS_DSI_MODE;
+    }
+    else
+    {
+        if (detectIsNitroEmulator())
+        {
+            _flags |= ENVIRONMENT_FLAGS_IS_NITRO_EMULATOR;
+            _flags |= ENVIRONMENT_FLAGS_JTAG_SEMIHOSTING;
+
+            REG_EXMEMCNT &= ~0xFF;
+
+            u32 agbMemoryAddress = *(vu32*)0x027FFF7C;
+            if (*(vu32*)(agbMemoryAddress + 0x100) == 0x44495349) //ISID
+                _flags |= ENVIRONMENT_FLAGS_AGB_SEMIHOSTING;
+        }
+        else
+        {
+            if (detectPicoAgbAdapter())
+                _flags |= ENVIRONMENT_FLAGS_PICO_AGB_ADAPTER;
+        }
+    }
+    if (!(_flags & ENVIRONMENT_FLAGS_IS_NITRO_EMULATOR))
+    {
+        if (detectNocashPrintSuppport())
+            _flags |= ENVIRONMENT_FLAGS_NOCASH_PRINT;
+    }
+}