[PATCH RFC 05/14] efi: stub: add additional types of memory

[Caleb Connolly]

U-Boot itself might be mapped as LOADER_CODE, there's also no reason not
to make additional pages accessible to the OS. This fixes an issue where
U-Boot can't run EFI apps because it gets relocated somewhere outside of
its own memory map.

Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
---
 lib/efi/efi_info.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/lib/efi/efi_info.c b/lib/efi/efi_info.c
index 3fa594b34b42..3754c913b54d 100644
--- a/lib/efi/efi_info.c
+++ b/lib/efi/efi_info.c
@@ -120,8 +120,28 @@ int of_populate_from_efi(struct device_node *root)
 
 	return ret;
 }
 
+static bool efi_mem_type_is_usable(u32 type)
+{
+	switch (type) {
+	case EFI_CONVENTIONAL_MEMORY:
+	case EFI_LOADER_DATA:
+	case EFI_LOADER_CODE:
+	case EFI_BOOT_SERVICES_CODE:
+		return true;
+	case EFI_RESERVED_MEMORY_TYPE:
+	case EFI_UNUSABLE_MEMORY:
+	case EFI_UNACCEPTED_MEMORY_TYPE:
+	case EFI_RUNTIME_SERVICES_DATA:
+	case EFI_MMAP_IO:
+	case EFI_MMAP_IO_PORT:
+	case EFI_PERSISTENT_MEMORY_TYPE:
+	default:
+		return false;
+	}
+}
+
 int dram_init_banksize_from_efi(void)
 {
 	struct efi_mem_desc *desc, *end;
 	struct efi_entry_memmap *map;
@@ -142,10 +162,9 @@ int dram_init_banksize_from_efi(void)
 		/*
 		 * We only use conventional memory and ignore
 		 * anything less than 1MB.
 		 */
-		if (desc->type != EFI_CONVENTIONAL_MEMORY ||
-		    (desc->num_pages << EFI_PAGE_SHIFT) < 1 << 20)
+		if (!efi_mem_type_is_usable(desc->type) || (desc->num_pages << EFI_PAGE_SHIFT) < 1 << 20)
 			continue;
 		gd->bd->bi_dram[num_banks].start = desc->physical_start;
 		gd->bd->bi_dram[num_banks].size = desc->num_pages <<
 			EFI_PAGE_SHIFT;

-- 
2.47.0