First versions

2 files changed, 74 insertions, 0 deletions

diff --git a/src/core/image.c b/src/core/image.c
new file mode 100644
index 00000000..31ea9557
--- /dev/null
+++ b/src/core/image.c
@@ -0,0 +1,49 @@
+#include "buffer.h"
+#include "image.h"
+
+static struct image images_start[0] __image_start;
+static struct image images_end[0] __image_end;
+
+/*
+ * Identify the image format
+ *
+ */
+static struct image * identify_image ( struct buffer *buffer ) {
+	struct image_header header;
+	int header_len = sizeof ( header );
+	off_t len;
+	struct image *image;
+	
+	/* Copy first (up to) 512 bytes of image to easily-accessible
+	 * buffer.
+	 */
+	len = buffer->fill;
+	copy_from_phys ( &header, buffer->start,
+			 len < header_len ? len : header_len );
+	
+	for ( image = images_start ; image < images_end ; image++ ) {
+		if ( image->probe ( &header, len ) )
+			return image;
+	}
+	
+	return NULL;
+}
+
+/*
+ * Boot a loaded image
+ *
+ */
+int boot_image ( struct buffer *buffer ) {
+	struct image *image;
+
+	image = identify_image ( buffer );
+	if ( ! image ) {
+		DBG ( "IMAGE could not identify image format\n" );
+		return 0;
+	}
+
+	DBG ( "IMAGE found %s image (length %d)\n",
+	      image->name, buffer->fill );
+
+	return image->boot ( buffer->start, buffer->fill );
+}
diff --git a/src/include/image.h b/src/include/image.h
new file mode 100644
index 00000000..e8a34b34
--- /dev/null
+++ b/src/include/image.h
@@ -0,0 +1,25 @@
+#ifndef IMAGE_H
+#define IMAGE_H
+
+#include "stdint.h"
+#include "io.h"
+#include "tables.h"
+
+#define IMAGE_HEADER_SIZE 512
+
+struct image_header {
+	char data[IMAGE_HEADER_SIZE];
+};
+
+struct image {
+	char *name;
+	int ( * probe ) ( struct image_header *header, off_t len );
+	int ( * boot ) ( physaddr_t start, off_t len );
+};
+
+#define __image_start		__table_start(image)
+#define __image			__table(image,01)
+#define __default_image		__table(image,02)
+#define __image_end		__table_end(image)
+
+#endif /* IMAGE_H */