- Initial checkin of the freebios2 tree

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@784 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/stream/rom_stream.c

@@ -0,0 +1,58 @@
+#include <console/console.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stream/read_bytes.h>
+#include <string.h>
+
+
+#ifndef CONFIG_ROM_STREAM_START
+#define CONFIG_ROM_STREAM_START 0xffff0000UL
+#endif
+
+static const unsigned char *rom_start = (void *)CONFIG_ROM_STREAM_START;
+static const unsigned char *rom_end   = (void *)(CONFIG_ROM_STREAM_START + PAYLOAD_SIZE - 1);
+static const unsigned char *rom;
+
+int stream_init(void)
+{
+	rom = rom_start;
+
+	printk_spew("%6d:%s() - rom_stream: 0x%08lx - 0x%08lx\n"
+		__LINE__, __FUNCTION__,
+		(unsigned long)rom_start,
+		(unsigned long)rom_end);
+	return 0;
+}
+
+
+void stream_fini(void)
+{
+	return;
+}
+
+byte_offset_t stream_skip(byte_offset_t count)
+{
+	byte_offset_t bytes;
+	bytes = count;
+	if ((rom + bytes) > rom_end) {
+		printk_warning("%6d:%s() - overflowed source buffer\n",
+			__LINE__, __FUNCTION__);
+		bytes = 0;
+		if (rom <= rom_end) {
+			bytes = (rom_end - rom) + 1;
+		}
+	}
+	rom += bytes;
+	return bytes;
+}
+
+byte_offset_t stream_read(void *vdest, byte_offset_t count)
+{
+	unsigned char *dest = vdest;
+	const unsigned char *src = rom;
+	byte_offset_t bytes;
+
+	bytes = stream_skip(count);
+	memcpy(dest, src, bytes);
+	return bytes;
+}