If a disk has an EFI system partition (ESP) then it can be used to locate the boot files. Add a function to find the ESP.
Signed-off-by: Mayuresh Chitale mchitale@ventanamicro.com Reviewed-by: Heinrich Schuchardt heinrich.schuchardt@canonical.com --- Changes in v3: - Fix part_get_esp signature and header in part.h
disk/part.c | 16 ++++++++++++++++ include/part.h | 13 +++++++++++++ 2 files changed, 29 insertions(+)
diff --git a/disk/part.c b/disk/part.c index 36b88205eca..6b1fbc18637 100644 --- a/disk/part.c +++ b/disk/part.c @@ -848,3 +848,19 @@ int part_get_bootable(struct blk_desc *desc)
return 0; } + +int part_get_esp(struct blk_desc *desc) +{ + struct disk_partition info; + int p; + + for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) { + int ret; + + ret = part_get_info(desc, p, &info); + if (!ret && (info.bootable & PART_EFI_SYSTEM_PARTITION)) + return p; + } + + return 0; +} diff --git a/include/part.h b/include/part.h index db34bc6bb7d..1aa6fe44ffb 100644 --- a/include/part.h +++ b/include/part.h @@ -690,6 +690,14 @@ int part_get_type_by_name(const char *name); */ int part_get_bootable(struct blk_desc *desc);
+/** + * part_get_esp() - Find the EFI system partition + * + * @desc: Block-device descriptor + * Return: the EFI system partition, or 0 if there is none + */ +int part_get_esp(struct blk_desc *desc); + #else static inline int part_driver_get_count(void) { return 0; } @@ -700,6 +708,11 @@ static inline struct part_driver *part_driver_get_first(void) static inline bool part_get_bootable(struct blk_desc *desc) { return false; }
+static inline int part_get_esp(struct blk_desc *desc) +{ + return 0; +} + #endif /* CONFIG_PARTITIONS */
#endif /* _PART_H */