From 8e4a355773cc64a89b3fc4d79981cfb02bda7e66 Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Fri, 8 Feb 2013 17:28:04 -0600 Subject: coreboot: introduce CONFIG_RELOCATABLE_RAMSTAGE This patch adds an option to build the ramstage as a reloctable binary. It uses the rmodule library for the relocation. The main changes consist of the following: 1. The ramstage is loaded just under the cmbem space. 2. Payloads cannot be loaded over where ramstage is loaded. If a payload is attempted to load where the relocatable ramstage resides the load is aborted. 3. The memory occupied by the ramstage is reserved from the OS's usage using the romstage_handoff structure stored in cbmem. This region is communicated to ramstage by an CBMEM_ID_ROMSTAGE_INFO entry in cbmem. 4. There is no need to reserve cbmem space for the OS controlled memory for the resume path because the ramsage region has been reserved in #3. 5. Since no memory needs to be preserved in the wake path, the loading and begin of execution of a elf payload is straight forward. Change-Id: Ia66cf1be65c29fa25ca7bd9ea6c8f11d7eee05f5 Signed-off-by: Aaron Durbin Reviewed-on: http://review.coreboot.org/2792 Reviewed-by: Ronald G. Minnich Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/lib/Makefile.inc | 1 + 1 file changed, 1 insertion(+) (limited to 'src/lib/Makefile.inc') diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc index d08ee7a4e0..97baaa2be0 100644 --- a/src/lib/Makefile.inc +++ b/src/lib/Makefile.inc @@ -110,6 +110,7 @@ $(obj)/lib/uart8250.smm.o : $(OPTION_TABLE_H) ifeq ($(CONFIG_RELOCATABLE_MODULES),y) ramstage-y += rmodule.c +romstage-$(CONFIG_RELOCATABLE_RAMSTAGE) += rmodule.c RMODULE_LDSCRIPT := $(src)/lib/rmodule.ld RMODULE_LDFLAGS := -nostartfiles -shared -z defs -nostdlib -Bsymbolic -T $(RMODULE_LDSCRIPT) -- cgit v1.2.3