Add Switch.version.emummc to determine if Atmosphère is running fro…

…m emuMMC or sysMMC
TooTallNate · Jun 24, 2024 · b526c8e · b526c8e
1 parent 1b5d56e
commit b526c8e
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diff --git a/.changeset/red-rocks-teach.md b/.changeset/red-rocks-teach.md
@@ -0,0 +1,5 @@
+---
+"nxjs-runtime": patch
+---
+
+Add `Switch.version.emummc` to determine if Atmosphère is running from emuMMC or sysMMC
diff --git a/packages/runtime/src/switch.ts b/packages/runtime/src/switch.ts
@@ -31,6 +31,10 @@ export interface Versions {
 	 */
 	ams: string | undefined;
 	cairo: string;
+	/**
+	 * `true` if the Switch is running Atmosphère from emuMMC, `false` if running sysMMC, or `undefined` if not running Atmosphère.
+	 */
+	emummc: boolean | undefined;
 	freetype2: string;
 	harfbuzz: string;
 	hos: string;

diff --git a/source/main.c b/source/main.c
@@ -452,6 +452,29 @@ static JSValue nx_version_get_ams(JSContext *ctx, JSValueConst this_val, int arg
 	return JS_NewString(ctx, version_str);
 }
 
+static JSValue nx_version_get_emummc(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv)
+{
+	if (!hosversionIsAtmosphere())
+	{
+		return JS_UNDEFINED;
+	}
+
+	nx_context_t *nx_ctx = JS_GetContextOpaque(ctx);
+	if (!nx_ctx->spl_initialized)
+	{
+		nx_ctx->spl_initialized = true;
+		splInitialize();
+	}
+
+	u64 is_emummc;
+	Result rc = splGetConfig((SplConfigItem)65007, &is_emummc);
+	if (R_FAILED(rc))
+	{
+		return nx_throw_libnx_error(ctx, rc, "splGetConfig(ExosphereEmummcType)");
+	}
+	return JS_NewBool(ctx, is_emummc ? true : false);
+}
+
 int nx_module_set_import_meta(JSContext *ctx, JSValueConst func_val,
 							  const char *url, JS_BOOL is_main)
 {
@@ -632,6 +655,7 @@ int main(int argc, char *argv[])
 	JSValue version_obj = JS_NewObject(ctx);
 	NX_DEF_GET_(version_obj, "ams", nx_version_get_ams, JS_PROP_C_W_E);
 	JS_SetPropertyStr(ctx, version_obj, "cairo", JS_NewString(ctx, cairo_version_string()));
+	NX_DEF_GET_(version_obj, "emummc", nx_version_get_emummc, JS_PROP_C_W_E);
 	JS_SetPropertyStr(ctx, version_obj, "freetype2", JS_NewString(ctx, FREETYPE_VERSION_STR));
 	JS_SetPropertyStr(ctx, version_obj, "harfbuzz", JS_NewString(ctx, HB_VERSION_STRING));
 	u32 hos_version = hosversionGet();