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authorPatrick Rudolph <patrick.rudolph@9elements.com>2020-04-17 16:16:49 +0200
committerMichał Żygowski <michal.zygowski@3mdeb.com>2020-10-22 12:29:47 +0000
commitbc744f5893fc4d53275ed26dd8d968011c6a09c1 (patch)
treefb283c9d57431020405a5404db04b425428f7709 /src/lib
parenta693fa06cd32da8239f820d833bb7a1bf55bf351 (diff)
downloadcoreboot-bc744f5893fc4d53275ed26dd8d968011c6a09c1.tar.xz
drivers/smmstore: Implement SMMSTORE version 2
SMMSTORE version 2 is a complete redesign of the current driver. It is not backwards-compatible with version 1, and only one version can be used at a time. Key features: * Uses a fixed communication buffer instead of writing to arbitrary memory addresses provided by untrusted ring0 code. * Gives the caller full control over the used data format. * Splits the store into smaller chunks to allow fault tolerant updates. * Doesn't provide feedback about the actual read/written bytes, just returns error or success in registers. * Returns an error if the requested operation would overflow the communication buffer. Separate the SMMSTORE into 64 KiB blocks that can individually be read/written/erased. To be used by payloads that implement a FaultTolerant Variable store like TianoCore. The implementation has been tested against EDK2 master. An example EDK2 implementation can be found here: https://github.com/9elements/edk2-1/commit/eb1127744a3a5d5c8ac4e8eb76f07e79c736dbe2 Change-Id: I25e49d184135710f3e6dd1ad3bed95de950fe057 Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Signed-off-by: Christian Walter <christian.walter@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/40520 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com> Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Diffstat (limited to 'src/lib')
-rw-r--r--src/lib/coreboot_table.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/lib/coreboot_table.c b/src/lib/coreboot_table.c
index 9148405879..857f5a52c3 100644
--- a/src/lib/coreboot_table.c
+++ b/src/lib/coreboot_table.c
@@ -20,6 +20,8 @@
#include <spi_flash.h>
#include <security/vboot/misc.h>
#include <security/vboot/vbnv_layout.h>
+#include <smmstore.h>
+
#if CONFIG(USE_OPTION_TABLE)
#include <option_table.h>
#endif
@@ -548,6 +550,10 @@ static uintptr_t write_coreboot_table(uintptr_t rom_table_end)
add_cbmem_pointers(head);
+ /* SMMSTORE v2 */
+ if (CONFIG(SMMSTORE_V2))
+ lb_smmstorev2(head);
+
/* Add board-specific table entries, if any. */
lb_board(head);