bc744f5893
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:
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| .. | ||
| arm/arch | ||
| arm64/arch | ||
| arpa | ||
| pci | ||
| storage | ||
| sys | ||
| udc | ||
| usb | ||
| x86/arch | ||
| archive.h | ||
| assert.h | ||
| cbfs.h | ||
| cbfs_core.h | ||
| cbfs_ram.h | ||
| cbgfx.h | ||
| compiler.h | ||
| coreboot_tables.h | ||
| ctype.h | ||
| die.h | ||
| endian.h | ||
| errno.h | ||
| exception.h | ||
| fmap_serialized.h | ||
| fpmath.h | ||
| gdb.h | ||
| getopt.h | ||
| inttypes.h | ||
| ipchksum.h | ||
| kconfig.h | ||
| keycodes.h | ||
| libpayload.h | ||
| limits.h | ||
| lz4.h | ||
| lzma.h | ||
| malloc.h | ||
| multiboot_tables.h | ||
| panel.h | ||
| pci.h | ||
| queue.h | ||
| stdarg.h | ||
| stddef.h | ||
| stdint.h | ||
| stdio.h | ||
| stdlib.h | ||
| string.h | ||
| strings.h | ||
| sysinfo.h | ||
| term.h | ||
| time.h | ||
| unistd.h | ||
| video_console.h | ||