efi_loader: Extract adding a conventional memory in separate routine

Adding a conventional memory region to the memory map may require ram_top
limitation and it can be also commonly used. Extract adding a conventional
memory to the memory map in a separate routine for generic use.
Signed-off-by: NAiden Park <aiden.park@intel.com>
Tested-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>

include/efi_loader.h

@@ -478,6 +478,10 @@ efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
 /* Adds a range into the EFI memory map */
 efi_status_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
 				bool overlap_only_ram);
+/* Adds a conventional range into the EFI memory map */
+efi_status_t efi_add_conventional_memory_map(u64 ram_start, u64 ram_end,
+					     u64 ram_top);
+
 /* Called by board init to initialize the EFI drivers */
 efi_status_t efi_driver_init(void);
 /* Called by board init to initialize the EFI memory map */

lib/efi_loader/efi_memory.c

@@ -655,6 +655,54 @@ efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
 	return EFI_SUCCESS;
 }
 
+/**
+ * efi_add_conventional_memory_map() - add a RAM memory area to the map
+ *
+ * @ram_start:		start address of a RAM memory area
+ * @ram_end:		end address of a RAM memory area
+ * @ram_top:		max address to be used as conventional memory
+ * Return:		status code
+ */
+efi_status_t efi_add_conventional_memory_map(u64 ram_start, u64 ram_end,
+					     u64 ram_top)
+{
+	u64 pages;
+
+	/* Remove partial pages */
+	ram_end &= ~EFI_PAGE_MASK;
+	ram_start = (ram_start + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
+
+	if (ram_end <= ram_start) {
+		/* Invalid mapping */
+		return EFI_INVALID_PARAMETER;
+	}
+
+	pages = (ram_end - ram_start) >> EFI_PAGE_SHIFT;
+
+	efi_add_memory_map(ram_start, pages,
+			   EFI_CONVENTIONAL_MEMORY, false);
+
+	/*
+	 * Boards may indicate to the U-Boot memory core that they
+	 * can not support memory above ram_top. Let's honor this
+	 * in the efi_loader subsystem too by declaring any memory
+	 * above ram_top as "already occupied by firmware".
+	 */
+	if (ram_top < ram_start) {
+		/* ram_top is before this region, reserve all */
+		efi_add_memory_map(ram_start, pages,
+				   EFI_BOOT_SERVICES_DATA, true);
+	} else if ((ram_top >= ram_start) && (ram_top < ram_end)) {
+		/* ram_top is inside this region, reserve parts */
+		pages = (ram_end - ram_top) >> EFI_PAGE_SHIFT;
+
+		efi_add_memory_map(ram_top, pages,
+				   EFI_BOOT_SERVICES_DATA, true);
+	}
+
+	return EFI_SUCCESS;
+}
+
 __weak void efi_add_known_memory(void)
 {
 	u64 ram_top = board_get_usable_ram_top(0) & ~EFI_PAGE_MASK;
@@ -672,42 +720,12 @@ __weak void efi_add_known_memory(void)
 
 	/* Add RAM */
 	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
-		u64 ram_end, ram_start, pages;
+		u64 ram_end, ram_start;
 
 		ram_start = (uintptr_t)map_sysmem(gd->bd->bi_dram[i].start, 0);
 		ram_end = ram_start + gd->bd->bi_dram[i].size;
 
-		/* Remove partial pages */
-		ram_end &= ~EFI_PAGE_MASK;
-		ram_start = (ram_start + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
-
-		if (ram_end <= ram_start) {
-			/* Invalid mapping, keep going. */
-			continue;
-		}
-
-		pages = (ram_end - ram_start) >> EFI_PAGE_SHIFT;
-
-		efi_add_memory_map(ram_start, pages,
-				   EFI_CONVENTIONAL_MEMORY, false);
-
-		/*
-		 * Boards may indicate to the U-Boot memory core that they
-		 * can not support memory above ram_top. Let's honor this
-		 * in the efi_loader subsystem too by declaring any memory
-		 * above ram_top as "already occupied by firmware".
-		 */
-		if (ram_top < ram_start) {
-			/* ram_top is before this region, reserve all */
-			efi_add_memory_map(ram_start, pages,
-					   EFI_BOOT_SERVICES_DATA, true);
-		} else if ((ram_top >= ram_start) && (ram_top < ram_end)) {
-			/* ram_top is inside this region, reserve parts */
-			pages = (ram_end - ram_top) >> EFI_PAGE_SHIFT;
-
-			efi_add_memory_map(ram_top, pages,
-					   EFI_BOOT_SERVICES_DATA, true);
-		}
+		efi_add_conventional_memory_map(ram_start, ram_end, ram_top);
 	}
 }