diff options
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/romstage_handoff.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/include/romstage_handoff.h b/src/include/romstage_handoff.h index 0cadfb551c..13dc9797bb 100644 --- a/src/include/romstage_handoff.h +++ b/src/include/romstage_handoff.h @@ -20,6 +20,8 @@ #define ROMSTAGE_HANDOFF_H #include <stdint.h> +#include <string.h> +#include <cbmem.h> /* It is the chipset's responsbility for maintaining the integrity of this * structure in CBMEM. For instance, if chipset code adds this structure @@ -31,5 +33,30 @@ struct romstage_handoff { uint32_t reserve_size; }; +#if defined(__PRE_RAM__) +/* The romstage_handoff_find_or_add() function provides the necessary logic + * for initializng the romstage_handoff structure in cbmem. Different components + * of the romstage may be responsible for setting up different fields. Therefore + * that same logic flow should be used for allocating and initializing the + * structure. A newly allocated structure will be memset to 0. */ +static inline struct romstage_handoff *romstage_handoff_find_or_add(void) +{ + struct romstage_handoff *handoff; + + /* cbmem_add() first does a find and uses the old location before the + * real add. However, it is important to know when the structure is not + * found so it can be initialized to 0. */ + handoff = cbmem_find(CBMEM_ID_ROMSTAGE_INFO); + + if (handoff == NULL) { + handoff = cbmem_add(CBMEM_ID_ROMSTAGE_INFO, sizeof(*handoff)); + if (handoff != NULL) + memset(handoff, 0, sizeof(*handoff)); + } + + return handoff; +} +#endif + #endif /* ROMSTAGE_HANDOFF_H */ |