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| author | Patrick Rudolph <patrick.rudolph@9elements.com> | 2020-04-17 16:16:49 +0200 |
|---|---|---|
| committer | Michał Żygowski <michal.zygowski@3mdeb.com> | 2020-10-22 12:29:47 +0000 |
| commit | bc744f5893fc4d53275ed26dd8d968011c6a09c1 (patch) | |
| tree | fb283c9d57431020405a5404db04b425428f7709 /src/lib | |
| parent | a693fa06cd32da8239f820d833bb7a1bf55bf351 (diff) | |
| download | coreboot-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.c | 6 |
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); |