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authorAaron Durbin <adurbin@chromium.org>2013-02-08 17:15:53 -0600
committerRonald G. Minnich <rminnich@gmail.com>2013-03-21 18:04:56 +0100
commitcddcc80048ab963f96d13575a3f63070cf6d7c14 (patch)
tree02c3ac7fdb82bc9eda29aff90dbf88e00c145079 /src/arch
parenta1db81b47a74ce53b8403eed28876efccf0bcefe (diff)
coreboot: introduce romstage_handoff structure
The romstage_handoff structure is intended to be a way for romstage and ramstage to communicate with one another instead of using sideband signals such as stuffing magic values in pci config or memory scratch space. Initially this structure just contains a single region that indicates to ramstage that it should reserve a memory region used by the romstage. Ramstage looks for a romstage_handoff structure in cbmem with an id of CBMEM_ID_ROMSTAGE_INFO. If found, it will honor reserving the region defined in the romstage_handoff structure. Change-Id: I9274ea5124e9bd6584f6977d8280b7e9292251f0 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/2791 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/x86/boot/coreboot_table.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/src/arch/x86/boot/coreboot_table.c b/src/arch/x86/boot/coreboot_table.c
index ab0f7ef821..463f723097 100644
--- a/src/arch/x86/boot/coreboot_table.c
+++ b/src/arch/x86/boot/coreboot_table.c
@@ -31,6 +31,7 @@
#include <stdlib.h>
#include <cbfs.h>
#include <cbmem.h>
+#include <romstage_handoff.h>
#if CONFIG_USE_OPTION_TABLE
#include <option_table.h>
#endif
@@ -591,6 +592,23 @@ static void add_lb_reserved(struct lb_memory *mem)
lb_add_rsvd_range, mem);
}
+static void add_romstage_resources(struct lb_memory *mem)
+{
+ struct romstage_handoff *handoff;
+
+ /* Reserve memory requested to be reserved from romstage. */
+ handoff = cbmem_find(CBMEM_ID_ROMSTAGE_INFO);
+
+ if (handoff == NULL)
+ return;
+
+ if (handoff->reserve_size == 0)
+ return;
+
+ lb_add_memory_range(mem, LB_MEM_RESERVED, handoff->reserve_base,
+ handoff->reserve_size);
+}
+
unsigned long write_coreboot_table(
unsigned long low_table_start, unsigned long low_table_end,
unsigned long rom_table_start, unsigned long rom_table_end)
@@ -658,6 +676,8 @@ unsigned long write_coreboot_table(
/* Add reserved regions */
add_lb_reserved(mem);
+ add_romstage_resources(mem);
+
lb_dump_memory_ranges(mem);
/* Note: