diff --git a/src/include/bootmem.h b/src/include/bootmem.h
index 161f482e13..7503306167 100644
--- a/src/include/bootmem.h
+++ b/src/include/bootmem.h
@@ -70,6 +70,17 @@ void bootmem_dump_ranges(void);
 
 typedef bool (*range_action_t)(const struct range_entry *r, void *arg);
 
+/**
+ * Walk memory tables from OS point of view and call the provided function,
+ * for every region. The caller has to return false to break out of the loop any
+ * time, or return true to continue.
+ *
+ * @param action The function to call for each memory range.
+ * @param arg Pointer passed to function @action. Set to NULL if unused.
+ * @return true if the function 'action' returned false.
+ */
+bool bootmem_walk_os_mem(range_action_t action, void *arg);
+
 /**
  * Walk memory tables and call the provided function, for every region.
  * The caller has to return false to break out of the loop any time, or
diff --git a/src/lib/bootmem.c b/src/lib/bootmem.c
index ed45e0f384..7363a8b5cb 100644
--- a/src/lib/bootmem.c
+++ b/src/lib/bootmem.c
@@ -26,6 +26,7 @@
 static int initialized;
 static int table_written;
 static struct memranges bootmem;
+static struct memranges bootmem_os;
 
 static int bootmem_is_initialized(void)
 {
@@ -66,6 +67,17 @@ static uint32_t bootmem_to_lb_tag(const enum bootmem_type tag)
 	}
 }
 
+static void bootmem_convert_ranges(void)
+{
+	/**
+	 * Convert BM_MEM_RAMSTAGE and BM_MEM_PAYLOAD to BM_MEM_RAM and
+	 * merge ranges. The payload doesn't care about memory used by firmware.
+	 */
+	memranges_clone(&bootmem_os, &bootmem);
+	memranges_update_tag(&bootmem_os, BM_MEM_RAMSTAGE, BM_MEM_RAM);
+	memranges_update_tag(&bootmem_os, BM_MEM_PAYLOAD, BM_MEM_RAM);
+}
+
 static void bootmem_init(void)
 {
 	const unsigned long cacheable = IORESOURCE_CACHEABLE;
@@ -91,6 +103,8 @@ static void bootmem_init(void)
 
 	bootmem_arch_add_ranges();
 	bootmem_platform_add_ranges();
+
+	bootmem_convert_ranges();
 }
 
 void bootmem_add_range(uint64_t start, uint64_t size,
@@ -108,22 +122,13 @@ void bootmem_write_memory_table(struct lb_memory *mem)
 {
 	const struct range_entry *r;
 	struct lb_memory_range *lb_r;
-	struct memranges bm;
 
 	lb_r = &mem->map[0];
 
 	bootmem_init();
 	bootmem_dump_ranges();
 
-	/**
-	 * Convert BM_MEM_RAMSTAGE and BM_MEM_PAYLOAD to BM_MEM_RAM and
-	 * merge ranges. The payload doesn't care about memory used by firmware.
-	 */
-	memranges_clone(&bm, &bootmem);
-	memranges_update_tag(&bm, BM_MEM_RAMSTAGE, BM_MEM_RAM);
-	memranges_update_tag(&bm, BM_MEM_PAYLOAD, BM_MEM_RAM);
-
-	memranges_each_entry(r, &bm) {
+	memranges_each_entry(r, &bootmem_os) {
 		lb_r->start = pack_lb64(range_entry_base(r));
 		lb_r->size = pack_lb64(range_entry_size(r));
 		lb_r->type = bootmem_to_lb_tag(range_entry_tag(r));
@@ -132,8 +137,6 @@ void bootmem_write_memory_table(struct lb_memory *mem)
 		mem->size += sizeof(struct lb_memory_range);
 	}
 
-	memranges_teardown(&bm);
-
 	table_written = 1;
 }
 
@@ -180,6 +183,20 @@ void bootmem_dump_ranges(void)
 	}
 }
 
+bool bootmem_walk_os_mem(range_action_t action, void *arg)
+{
+	const struct range_entry *r;
+
+	assert(bootmem_is_initialized());
+
+	memranges_each_entry(r, &bootmem_os) {
+		if (!action(r, arg))
+			return true;
+	}
+
+	return false;
+}
+
 bool bootmem_walk(range_action_t action, void *arg)
 {
 	const struct range_entry *r;