1 files changed, 40 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 8b6f7a99cce2..eb23ac92abb9 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -559,6 +559,35 @@ void __init early_init_dt_setup_initrd_arch(unsigned long start,
 }
 #endif
 
+static void __init early_reserve_mem_dt(void)
+{
+        unsigned long i, len, dt_root;
+        const __be32 *prop;
+
+        dt_root = of_get_flat_dt_root();
+
+        prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
+
+        if (!prop)
+                return;
+
+        DBG("Found new-style reserved-ranges\n");
+
+        /* Each reserved range is an (address,size) pair, 2 cells each,
+         * totalling 4 cells per range. */
+        for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
+                u64 base, size;
+
+                base = of_read_number(prop + (i * 4) + 0, 2);
+                size = of_read_number(prop + (i * 4) + 2, 2);
+
+                if (size) {
+                        DBG("reserving: %llx -> %llx\n", base, size);
+                        memblock_reserve(base, size);
+                }
+        }
+}
+
 static void __init early_reserve_mem(void)
 {
         u64 base, size;
@@ -574,12 +603,16 @@ static void __init early_reserve_mem(void)
         self_size = initial_boot_params->totalsize;
         memblock_reserve(self_base, self_size);
 
+        /* Look for the new "reserved-regions" property in the DT */
+        early_reserve_mem_dt();
+
 #ifdef CONFIG_BLK_DEV_INITRD
-        /* then reserve the initrd, if any */
-        if (initrd_start && (initrd_end > initrd_start))
+        /* Then reserve the initrd, if any */
+        if (initrd_start && (initrd_end > initrd_start)) {
                 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
                         _ALIGN_UP(initrd_end, PAGE_SIZE) -
                         _ALIGN_DOWN(initrd_start, PAGE_SIZE));
+        }
 #endif /* CONFIG_BLK_DEV_INITRD */
 
 #ifdef CONFIG_PPC32
@@ -591,6 +624,8 @@ static void __init early_reserve_mem(void)
                 u32 base_32, size_32;
                 u32 *reserve_map_32 = (u32 *)reserve_map;
 
+                DBG("Found old 32-bit reserve map\n");
+
                 while (1) {
                         base_32 = *(reserve_map_32++);
                         size_32 = *(reserve_map_32++);
@@ -605,6 +640,9 @@ static void __init early_reserve_mem(void)
                 return;
         }
 #endif
+        DBG("Processing reserve map\n");
+
+        /* Handle the reserve map in the fdt blob if it exists */
         while (1) {
                 base = *(reserve_map++);
                 size = *(reserve_map++);