efi: Use the generic efi.memmap instead of 'memmap'

[firefly-linux-kernel-4.4.55.git] / drivers / firmware / efi / efi.c

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index d7a9160008d362275cb0c5a62722b80b7d1ec324..16c4928e36af143caccf54f3a4c4c83affb178f0 100644 (file)
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -607,3 +607,36 @@ char * __init efi_md_typeattr_format(char *buf, size_t size,
                         attr & EFI_MEMORY_UC      ? "UC"  : "");
        return buf;
 }
+
+/*
+ * efi_mem_attributes - lookup memmap attributes for physical address
+ * @phys_addr: the physical address to lookup
+ *
+ * Search in the EFI memory map for the region covering
+ * @phys_addr. Returns the EFI memory attributes if the region
+ * was found in the memory map, 0 otherwise.
+ *
+ * Despite being marked __weak, most architectures should *not*
+ * override this function. It is __weak solely for the benefit
+ * of ia64 which has a funky EFI memory map that doesn't work
+ * the same way as other architectures.
+ */
+u64 __weak efi_mem_attributes(unsigned long phys_addr)
+{
+       struct efi_memory_map *map;
+       efi_memory_desc_t *md;
+       void *p;
+
+       if (!efi_enabled(EFI_MEMMAP))
+               return 0;
+
+       map = efi.memmap;
+       for (p = map->map; p < map->map_end; p += map->desc_size) {
+               md = p;
+               if ((md->phys_addr <= phys_addr) &&
+                   (phys_addr < (md->phys_addr +
+                   (md->num_pages << EFI_PAGE_SHIFT))))
+                       return md->attribute;
+       }
+       return 0;
+}