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-rw-r--r--src/stream/rom_stream.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/src/stream/rom_stream.c b/src/stream/rom_stream.c
new file mode 100644
index 0000000000..20b7686c84
--- /dev/null
+++ b/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;
+}