[PATCH v3 4/6] efi: mm: Extract function to add memory regions

[Patrick Steinhardt <ps@pks.im>]

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In preparation of support for runtime-allocating additional memory
region, this patch extracts the function to retrieve the EFI memory map
and add a subset of it to GRUB's own memory regions.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 grub-core/kern/efi/mm.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
index 4d276bc87..cfc6a67fc 100644
--- a/grub-core/kern/efi/mm.c
+++ b/grub-core/kern/efi/mm.c
@@ -504,7 +504,7 @@ add_memory_regions (grub_efi_memory_descriptor_t *memory_map,
 
       addr = grub_efi_allocate_pages_real (start, pages,
 					   GRUB_EFI_ALLOCATE_ADDRESS,
-					   GRUB_EFI_LOADER_CODE);      
+					   GRUB_EFI_LOADER_CODE);
       if (! addr)
 	grub_fatal ("cannot allocate conventional memory %p with %u pages",
 		    (void *) ((grub_addr_t) start),
@@ -556,8 +556,8 @@ print_memory_map (grub_efi_memory_descriptor_t *memory_map,
 }
 #endif
 
-void
-grub_efi_mm_init (void)
+static grub_err_t
+grub_efi_mm_add_regions (grub_efi_uint64_t required_bytes)
 {
   grub_efi_memory_descriptor_t *memory_map;
   grub_efi_memory_descriptor_t *memory_map_end;
@@ -570,7 +570,7 @@ grub_efi_mm_init (void)
   /* Prepare a memory region to store two memory maps.  */
   memory_map = grub_efi_allocate_any_pages (2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
   if (! memory_map)
-    grub_fatal ("cannot allocate memory");
+    return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate memory");
 
   /* Obtain descriptors for available memory.  */
   map_size = MEMORY_MAP_SIZE;
@@ -588,14 +588,14 @@ grub_efi_mm_init (void)
 
       memory_map = grub_efi_allocate_any_pages (2 * BYTES_TO_PAGES (map_size));
       if (! memory_map)
-	grub_fatal ("cannot allocate memory");
+	return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate memory");
 
       mm_status = grub_efi_get_memory_map (&map_size, memory_map, 0,
 					   &desc_size, 0);
     }
 
   if (mm_status < 0)
-    grub_fatal ("cannot get memory map");
+    return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot get memory map");
 
   memory_map_end = NEXT_MEMORY_DESCRIPTOR (memory_map, map_size);
 
@@ -610,7 +610,7 @@ grub_efi_mm_init (void)
 
   /* Allocate memory regions for GRUB's memory management.  */
   add_memory_regions (filtered_memory_map, desc_size,
-		      filtered_memory_map_end, BYTES_TO_PAGES (DEFAULT_HEAP_SIZE));
+		      filtered_memory_map_end, BYTES_TO_PAGES (required_bytes));
 
 #if 0
   /* For debug.  */
@@ -628,6 +628,15 @@ grub_efi_mm_init (void)
   /* Release the memory maps.  */
   grub_efi_free_pages ((grub_addr_t) memory_map,
 		       2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
+
+  return GRUB_ERR_NONE;
+}
+
+void
+grub_efi_mm_init (void)
+{
+  if (grub_efi_mm_add_regions (DEFAULT_HEAP_SIZE) != GRUB_ERR_NONE)
+    grub_fatal ("%s", grub_errmsg);
 }
 
 #if defined (__aarch64__) || defined (__arm__) || defined (__riscv)
-- 
2.32.0


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