From ead73689db79fecc3e17215d100ab52ce4377657 Mon Sep 17 00:00:00 2001
From: Stefan Reinauer <stepan@openbios.org>
Date: Tue, 2 May 2006 12:05:13 +0000
Subject: add automatic payload compression method to LinuxBIOS

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2288 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
---
 src/stream/Config.lb     |  5 +++
 src/stream/rom_stream.c  |  4 +--
 src/stream/zrom_stream.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 91 insertions(+), 2 deletions(-)
 create mode 100644 src/stream/zrom_stream.c

(limited to 'src/stream')

diff --git a/src/stream/Config.lb b/src/stream/Config.lb
index b146c0451e..46c2dc7f08 100644
--- a/src/stream/Config.lb
+++ b/src/stream/Config.lb
@@ -1,3 +1,4 @@
+uses CONFIG_COMPRESSED_ROM_STREAM
 uses CONFIG_ROM_STREAM
 uses CONFIG_IDE_STREAM
 uses CONFIG_FS_STREAM
@@ -7,6 +8,10 @@ if CONFIG_ROM_STREAM
   object rom_stream.o
 end
 
+if CONFIG_COMPRESSED_ROM_STREAM
+  object zrom_stream.o
+end
+
 if CONFIG_IDE_STREAM
   default CONFIG_IDE=1
   object ide_stream.o
diff --git a/src/stream/rom_stream.c b/src/stream/rom_stream.c
index 7a662d019e..1127be0b8a 100644
--- a/src/stream/rom_stream.c
+++ b/src/stream/rom_stream.c
@@ -18,8 +18,8 @@
  */
 
 /*XXXXXXXXXXXXXX */
-/*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_start = (unsigned char *)CONFIG_ROM_STREAM_START;
+/*static const */unsigned char *rom_end   = (unsigned char *)(CONFIG_ROM_STREAM_START + PAYLOAD_SIZE - 1);
 /*XXXXXXXXXXXXXX */
 static const unsigned char *rom;
 
diff --git a/src/stream/zrom_stream.c b/src/stream/zrom_stream.c
new file mode 100644
index 0000000000..39da619a04
--- /dev/null
+++ b/src/stream/zrom_stream.c
@@ -0,0 +1,84 @@
+#include <console/console.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stream/read_bytes.h>
+#include <string.h>
+
+// include generic nrv2b 
+#include "../lib/nrv2b.c"
+
+#ifndef CONFIG_ROM_STREAM_START
+#define CONFIG_ROM_STREAM_START 0xffff0000UL
+#endif
+
+unsigned char *rom_start = (unsigned char *)CONFIG_ROM_STREAM_START;
+unsigned char *rom_end = (unsigned char *)(CONFIG_ROM_STREAM_START + PAYLOAD_SIZE - 1);;
+
+extern unsigned char _heap, _eheap;
+
+static const unsigned char *rom;
+
+int stream_init(void)
+{
+	unsigned long compressed_rom_start=rom_start; 
+	unsigned long compressed_rom_end=rom_end; 
+	unsigned int len;
+	
+	len=*(unsigned int *)compressed_rom_start; // LE only for now
+
+	printk_debug (" compressed rom stream: 0x%08lx - 0x%08lx\n",
+				compressed_rom_start, compressed_rom_end);
+
+	rom_start = &_eheap;
+	rom_end = rom_start + len; // LE only for now
+#if 0
+	{
+	int i;
+	for (i=0; i<512; i++) {
+		if( i%16==0) printk_spew("\n%04x :", i);
+		printk_spew(" %02x", *(unsigned char *)(compressed_rom_start+i));
+	}
+	}
+#endif
+	printk_debug(" rom stream: 0x%08lx - 0x%08lx\n", (unsigned long) 
+			rom_start, (unsigned long) rom_end);
+
+	printk_debug("Uncompressing...");
+	unrv2b((uint8_t *) compressed_rom_start, (uint8_t *)rom_start);
+	printk_debug(" done.\n");
+	
+	rom = rom_start;
+
+	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(" overflowed source buffer\n");
+		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;
+}
-- 
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