1 files changed, 35 insertions, 0 deletions
diff --git a/src/core/genome.h b/src/core/genome.h
new file mode 100644
index 0000000..9d0ff96
--- /dev/null
+++ b/src/core/genome.h
@@ -0,0 +1,35 @@
+/* the genome: the image a core boots, embedded into the core when it is
+   compiled. an image is a file of little-endian 64-bit words placed at GORG,
+   as written by zc0 or by src/tools/build.zc and checked by mkgenome. the
+   build keeps every image in build/, never in the tree.
+
+   GENOME_FILE names the image. it defaults to "genome.bin" (or
+   "lsp_genome.bin" with USE_LSP_GENOME) and is found next to this header,
+   then in the directories given with --embed-dir, so that option selects
+   which image a core carries. the file needs a compiler with c23
+   #embed (clang 19 or gcc 15 and later).
+
+   no libc here: the microcore includes this on bare metal. */
+#ifndef GENOME_H_INCLUDED
+#define GENOME_H_INCLUDED
+#include <stdint.h>
+#ifndef GENOME_FILE
+#ifdef USE_LSP_GENOME
+#define GENOME_FILE "lsp_genome.bin"
+#else
+#define GENOME_FILE "genome.bin"
+#endif
+#endif
+static const unsigned char genome_image[] = {
+#embed GENOME_FILE
+};
+/* the image's length in words */
+#define GLEN ((int)(sizeof genome_image / 8))
+/* word i of the image, independent of the host's byte order */
+static int64_t genome_word(int i)
+{
+	const unsigned char *b = genome_image + (long)i * 8;
+	return (int64_t)((uint64_t)b[0] | (uint64_t)b[1] << 8 | (uint64_t)b[2] << 16 | (uint64_t)b[3] << 24
+		| (uint64_t)b[4] << 32 | (uint64_t)b[5] << 40 | (uint64_t)b[6] << 48 | (uint64_t)b[7] << 56);
+}
+#endif