1 files changed, 58 insertions, 0 deletions
diff --git a/machine/finisher.c b/machine/finisher.c
new file mode 100644
index 0000000..d113096
--- /dev/null
+++ b/machine/finisher.c
@@ -0,0 +1,58 @@
+#include <string.h>
+#include "finisher.h"
+#include "fdt.h"
+
+volatile uint32_t* finisher;
+
+void finisher_exit(uint16_t code)
+{
+  if (!finisher) return;
+  if (code == 0) {
+    *finisher = FINISHER_PASS;
+  } else {
+    *finisher = code << 16 | FINISHER_FAIL;
+  }
+}
+
+struct finisher_scan
+{
+  int compat;
+  uint64_t reg;
+};
+
+static void finisher_open(const struct fdt_scan_node *node, void *extra)
+{
+  struct finisher_scan *scan = (struct finisher_scan *)extra;
+  memset(scan, 0, sizeof(*scan));
+}
+
+static void finisher_prop(const struct fdt_scan_prop *prop, void *extra)
+{
+  struct finisher_scan *scan = (struct finisher_scan *)extra;
+  if (!strcmp(prop->name, "compatible") && !strcmp((const char*)prop->value, "sifive,test0")) {
+    scan->compat = 1;
+  } else if (!strcmp(prop->name, "reg")) {
+    fdt_get_address(prop->node->parent, prop->value, &scan->reg);
+  }
+}
+
+static void finisher_done(const struct fdt_scan_node *node, void *extra)
+{
+  struct finisher_scan *scan = (struct finisher_scan *)extra;
+  if (!scan->compat || !scan->reg || finisher) return;
+  finisher = (uint32_t*)(uintptr_t)scan->reg;
+}
+
+void query_finisher(uintptr_t fdt)
+{
+  struct fdt_cb cb;
+  struct finisher_scan scan;
+
+  memset(&cb, 0, sizeof(cb));
+  cb.open = finisher_open;
+  cb.prop = finisher_prop;
+  cb.done = finisher_done;
+  cb.extra = &scan;
+
+  fdt_scan(fdt, &cb);
+}