4 files changed, 107 insertions, 2 deletions
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index a902e0cd6acf..08ad9b2e4e23 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -19,6 +19,19 @@ ramstage-y += ubsan.c
 CFLAGS_ramstage += -fsanitize=undefined
 endif
 
+decompressor-y += decompressor.c
+$(call src-to-obj,decompressor,$(dir)/decompressor.c): $(objcbfs)/bootblock.lz4
+$(call src-to-obj,decompressor,$(dir)/decompressor.c): CCACHE_EXTRAFILES=$(objcbfs)/bootblock.lz4
+# Must reset CCACHE_EXTRAFILES or make applies it transitively to dependencies.
+$(objcbfs)/bootblock.lz4: CCACHE_EXTRAFILES=
+
+decompressor-y += delay.c
+decompressor-$(CONFIG_GENERIC_GPIO_LIB) += gpio.c
+decompressor-y += memchr.c
+decompressor-y += memcmp.c
+decompressor-y += prog_ops.c
+decompressor-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
+
 ifneq ($(CONFIG_BOOTBLOCK_CUSTOM),y)
 bootblock-y += bootblock.c
 endif
@@ -216,11 +229,13 @@ romstage-y += bootmode.c
 ramstage-y += bootmode.c
 verstage-y += bootmode.c
 
+decompressor-y += halt.c
 bootblock-y += halt.c
 romstage-y += halt.c
 ramstage-y += halt.c
 smm-y += halt.c
 
+decompressor-y += reset.c
 bootblock-y += reset.c
 verstage-y += reset.c
 romstage-y += reset.c
@@ -248,6 +263,7 @@ postcar-$(CONFIG_GENERIC_UDELAY) += timer.c
 # Use program.ld for all the platforms which use C fo the bootblock.
 bootblock-$(CONFIG_C_ENVIRONMENT_BOOTBLOCK) += program.ld
 
+decompressor-y += program.ld
 postcar-y += program.ld
 romstage-y += program.ld
 ramstage-y += program.ld
diff --git a/src/lib/bootblock.c b/src/lib/bootblock.c
index 867f1b16e6b9..d74bebfe8324 100644
--- a/src/lib/bootblock.c
+++ b/src/lib/bootblock.c
@@ -70,3 +70,20 @@ void main(void)
 
 	bootblock_main_with_timestamp(base_timestamp, NULL, 0);
 }
+
+#if IS_ENABLED(CONFIG_COMPRESS_BOOTBLOCK)
+/*
+ * This is the bootblock entry point when it is run after a decompressor stage.
+ * For non-decompressor builds, _start is generally defined in architecture-
+ * specific assembly code. In decompressor builds that architecture
+ * initialization code already ran in the decompressor, so the bootblock can
+ * start straight into common code with a C environment.
+ */
+void _start(struct bootblock_arg *arg);
+void _start(struct bootblock_arg *arg)
+{
+	bootblock_main_with_timestamp(arg->base_timestamp, arg->timestamps,
+				      arg->num_timestamps);
+}
+
+#endif
diff --git a/src/lib/decompressor.c b/src/lib/decompressor.c
new file mode 100644
index 000000000000..7a5bf3b289d8
--- /dev/null
+++ b/src/lib/decompressor.c
@@ -0,0 +1,70 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <bootblock_common.h>
+#include <commonlib/compression.h>
+#include <delay.h>
+#include <program_loading.h>
+#include <symbols.h>
+
+extern u8 compressed_bootblock[];
+asm (
+	".pushsection .data.compressed_bootblock,\"a\",@progbits\n\t"
+	".type compressed_bootblock, %object\n\t"
+	".balign 8\n"
+	"compressed_bootblock:\n\t"
+	".incbin \"" __BUILD_DIR__ "/cbfs/" CONFIG_CBFS_PREFIX "/bootblock.lz4\"\n\t"
+	".size compressed_bootblock, . - compressed_bootblock\n\t"
+	".popsection\n\t"
+);
+
+struct bootblock_arg arg = {
+	.base_timestamp = 0,
+	.num_timestamps = 2,
+	.timestamps = {
+		{ .entry_id = TS_START_ULZ4F },
+		{ .entry_id = TS_END_ULZ4F },
+	},
+};
+
+struct prog prog_bootblock = {
+	.type = PROG_BOOTBLOCK,
+	.entry = (void *)_bootblock,
+	.arg = &arg,
+};
+
+__weak void decompressor_soc_init(void) { /* no-op */ }
+
+void main(void)
+{
+	init_timer();
+
+	if (IS_ENABLED(CONFIG_COLLECT_TIMESTAMPS))
+		arg.base_timestamp = timestamp_get();
+
+	decompressor_soc_init();
+
+	if (IS_ENABLED(CONFIG_COLLECT_TIMESTAMPS))
+		arg.timestamps[0].entry_stamp = timestamp_get();
+
+	size_t out_size = ulz4f(compressed_bootblock, _bootblock);
+	prog_segment_loaded((uintptr_t)_bootblock, out_size, SEG_FINAL);
+
+	if (IS_ENABLED(CONFIG_COLLECT_TIMESTAMPS))
+		arg.timestamps[1].entry_stamp = timestamp_get();
+
+	prog_run(&prog_bootblock);
+}
diff --git a/src/lib/program.ld b/src/lib/program.ld
index 668b29b18eb3..156b86255c1c 100644
--- a/src/lib/program.ld
+++ b/src/lib/program.ld
@@ -34,8 +34,10 @@
 	*(.rom.data);
 	*(.text._start);
 	*(.text.stage_entry);
-#if ENV_BOOTBLOCK && !(IS_ENABLED(CONFIG_ARCH_BOOTBLOCK_X86_32) || \
-		       IS_ENABLED(CONFIG_ARCH_BOOTBLOCK_X86_64))
+#if (ENV_DECOMPRESSOR || ENV_BOOTBLOCK && \
+		!IS_ENABLED(CONFIG_COMPRESS_BOOTBLOCK)) && \
+    !(IS_ENABLED(CONFIG_ARCH_BOOTBLOCK_X86_32) || \
+      IS_ENABLED(CONFIG_ARCH_BOOTBLOCK_X86_64))
 	KEEP(*(.id));
 #endif
 	*(.text);