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authorAaron Durbin <adurbin@chromium.org>2013-02-08 17:28:04 -0600
committerStefan Reinauer <stefan.reinauer@coreboot.org>2013-03-21 22:28:28 +0100
commit8e4a355773cc64a89b3fc4d79981cfb02bda7e66 (patch)
tree01a9e6d5fc66568fd5c318e5edf17d47e73f65e8 /src/include
parent43e4a80a92bf00540e4d9b0734eb53f32044226f (diff)
downloadcoreboot-8e4a355773cc64a89b3fc4d79981cfb02bda7e66.tar.xz
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 <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/2792 Reviewed-by: Ronald G. Minnich <rminnich@gmail.com> Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@google.com>
Diffstat (limited to 'src/include')
-rw-r--r--src/include/cbmem.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/include/cbmem.h b/src/include/cbmem.h
index 0aa9b305d7..d0f0c9a5cc 100644
--- a/src/include/cbmem.h
+++ b/src/include/cbmem.h
@@ -28,7 +28,12 @@
#endif
#if CONFIG_HAVE_ACPI_RESUME
+#if CONFIG_RELOCATABLE_RAMSTAGE
+#define HIGH_MEMORY_SAVE 0
+#else
#define HIGH_MEMORY_SAVE (CONFIG_RAMTOP - CONFIG_RAMBASE)
+#endif
+
#define HIGH_MEMORY_SIZE (HIGH_MEMORY_SAVE + CONFIG_HIGH_SCRATCH_MEMORY_SIZE + HIGH_MEMORY_DEF_SIZE)
/* Delegation of resume backup memory so we don't have to