[PATCH] ia64 uncached alloc

[mirror_ubuntu-artful-kernel.git] / arch / ia64 / kernel / efi.c

diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index 4a3b1aac43e737e4082d36eb5eee0846628fc73a..179f230816edf52dd57a990a188465455d1f73fa 100644 (file)
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -409,6 +409,38 @@ efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
        }
 }
 
+/*
+ * Walk the EFI memory map to pull out leftover pages in the lower
+ * memory regions which do not end up in the regular memory map and
+ * stick them into the uncached allocator
+ *
+ * The regular walk function is significantly more complex than the
+ * uncached walk which means it really doesn't make sense to try and
+ * marge the two.
+ */
+void __init
+efi_memmap_walk_uc (efi_freemem_callback_t callback)
+{
+       void *efi_map_start, *efi_map_end, *p;
+       efi_memory_desc_t *md;
+       u64 efi_desc_size, start, end;
+
+       efi_map_start = __va(ia64_boot_param->efi_memmap);
+       efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
+       efi_desc_size = ia64_boot_param->efi_memdesc_size;
+
+       for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
+               md = p;
+               if (md->attribute == EFI_MEMORY_UC) {
+                       start = PAGE_ALIGN(md->phys_addr);
+                       end = PAGE_ALIGN((md->phys_addr+(md->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK);
+                       if ((*callback)(start, end, NULL) < 0)
+                               return;
+               }
+       }
+}
+
+
 /*
  * Look for the PAL_CODE region reported by EFI and maps it using an
  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor