efi_loader: Add mem-mapped for fallback

[oweals/u-boot.git] / lib / efi_loader / efi_device_path.c

diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 5d5c3b346467d3b2ddcfb3d38c09ee7ba91f7437..f6e368e029bdf37a768d54b9291c104fda8a30db 100644 (file)
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -538,6 +538,30 @@ struct efi_device_path *efi_dp_from_eth(void)
 }
 #endif
 
+/* Construct a device-path for memory-mapped image */
+struct efi_device_path *efi_dp_from_mem(uint32_t memory_type,
+                                       uint64_t start_address,
+                                       uint64_t end_address)
+{
+       struct efi_device_path_memory *mdp;
+       void *buf, *start;
+
+       start = buf = dp_alloc(sizeof(*mdp) + sizeof(END));
+
+       mdp = buf;
+       mdp->dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
+       mdp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MEMORY;
+       mdp->dp.length = sizeof(*mdp);
+       mdp->memory_type = memory_type;
+       mdp->start_address = start_address;
+       mdp->end_address = end_address;
+       buf = &mdp[1];
+
+       *((struct efi_device_path *)buf) = END;
+
+       return start;
+}
+
 /*
  * Helper to split a full device path (containing both device and file
  * parts) into it's constituent parts.