dtc: implement labels on memory reserve slots

Allow a label to be placed on a memory reserve entry.
Change the parser to recognize and store them.  Emit
them when writing assembly output.

Signed-off-by: Milton Miller <miltonm@bga.com>

dtc-parser.y

@@ -92,11 +92,11 @@ memreserves:	memreserve memreserves {
 		}
 	;
 
-memreserve:	DT_MEMRESERVE DT_ADDR DT_ADDR ';' {
-			$$ = build_reserve_entry($2, $3, NULL);
+memreserve:	label DT_MEMRESERVE DT_ADDR DT_ADDR ';' {
+			$$ = build_reserve_entry($3, $4, $1);
 		}
-	|	DT_MEMRESERVE DT_ADDR '-' DT_ADDR ';' {
-			$$ = build_reserve_entry($2, $4 - $2 + 1, NULL);
+	|	label DT_MEMRESERVE DT_ADDR '-' DT_ADDR ';' {
+			$$ = build_reserve_entry($3, $5 - $3 + 1, $1);
 		}
 	;
 

flattree.c

@@ -497,6 +497,10 @@ void dt_to_asm(FILE *f, struct boot_info *bi, int version, int boot_cpuid_phys)
 	 * as it appears .quad isn't available in some assemblers.
 	 */
 	for (re = bi->reservelist; re; re = re->next) {
+		if (re->label) {
+			fprintf(f, "\t.globl\t%s\n", re->label);
+			fprintf(f, "%s:\n", re->label);
+		}
 		fprintf(f, "\t.long\t0x%08x\n\t.long\t0x%08x\n",
 			(unsigned int)(re->re.address >> 32),
 			(unsigned int)(re->re.address & 0xffffffff));