| 61 | } |
| 62 | |
| 63 | static void setup_preram_cache(struct region_device *cache_rdev) |
| 64 | { |
| 65 | if (CONFIG(NO_FMAP_CACHE)) |
| 66 | return; |
| 67 | |
| 68 | /* No need to use FMAP cache in SMM */ |
| 69 | if (ENV_SMM) |
| 70 | return; |
| 71 | |
| 72 | if (!ENV_ROMSTAGE_OR_BEFORE) { |
| 73 | /* We get here if ramstage makes an FMAP access before calling |
| 74 | cbmem_initialize(). We should avoid letting it come to that, |
| 75 | so print a warning. */ |
| 76 | print_once(BIOS_WARNING, |
| 77 | "WARNING: Post-RAM FMAP access too early for cache!\n"); |
| 78 | return; |
| 79 | } |
| 80 | |
| 81 | struct fmap *fmap = (struct fmap *)_fmap_cache; |
| 82 | if (!(ENV_INITIAL_STAGE)) { |
| 83 | /* NOTE: This assumes that the first stage will make |
| 84 | at least one FMAP access (usually from finding CBFS). */ |
| 85 | if (!verify_fmap(fmap)) |
| 86 | goto register_cache; |
| 87 | |
| 88 | /* This shouldn't happen, so no point providing a fallback path here. */ |
| 89 | die("FMAP cache corrupted?!\n"); |
| 90 | } |
| 91 | |
| 92 | /* In case we fail below, make sure the cache is invalid. */ |
| 93 | memset(fmap->signature, 0, sizeof(fmap->signature)); |
| 94 | |
| 95 | boot_device_init(); |
| 96 | const struct region_device *boot_rdev = boot_device_ro(); |
| 97 | if (!boot_rdev) |
| 98 | return; |
| 99 | |
| 100 | /* memlayout statically guarantees that the FMAP_CACHE is big enough. */ |
| 101 | if (rdev_readat(boot_rdev, fmap, FMAP_OFFSET, FMAP_SIZE) != FMAP_SIZE) |
| 102 | return; |
| 103 | if (verify_fmap(fmap)) |
| 104 | return; |
| 105 | report(fmap); |
| 106 | |
| 107 | register_cache: |
| 108 | rdev_chain_mem(cache_rdev, fmap, FMAP_SIZE); |
| 109 | } |
| 110 | |
| 111 | static int find_fmap_directory(struct region_device *fmrd) |
| 112 | { |
no test coverage detected