1 files changed, 63 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/mmzone.h b/arch/parisc/include/asm/mmzone.h
new file mode 100644
index 000000000..fafa3893f
--- /dev/null
+++ b/arch/parisc/include/asm/mmzone.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _PARISC_MMZONE_H
+#define _PARISC_MMZONE_H
+
+#define MAX_PHYSMEM_RANGES 8 /* Fix the size for now (current known max is 3) */
+
+#ifdef CONFIG_DISCONTIGMEM
+
+extern int npmem_ranges;
+
+struct node_map_data {
+    pg_data_t pg_data;
+};
+
+extern struct node_map_data node_data[];
+
+#define NODE_DATA(nid)          (&node_data[nid].pg_data)
+
+/* We have these possible memory map layouts:
+ * Astro: 0-3.75, 67.75-68, 4-64
+ * zx1: 0-1, 257-260, 4-256
+ * Stretch (N-class): 0-2, 4-32, 34-xxx
+ */
+
+/* Since each 1GB can only belong to one region (node), we can create
+ * an index table for pfn to nid lookup; each entry in pfnnid_map 
+ * represents 1GB, and contains the node that the memory belongs to. */
+
+#define PFNNID_SHIFT (30 - PAGE_SHIFT)
+#define PFNNID_MAP_MAX  512     /* support 512GB */
+extern signed char pfnnid_map[PFNNID_MAP_MAX];
+
+#ifndef CONFIG_64BIT
+#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
+#else
+/* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
+#define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
+#endif
+
+static inline int pfn_to_nid(unsigned long pfn)
+{
+	unsigned int i;
+
+	if (unlikely(pfn_is_io(pfn)))
+		return 0;
+
+	i = pfn >> PFNNID_SHIFT;
+	BUG_ON(i >= ARRAY_SIZE(pfnnid_map));
+
+	return pfnnid_map[i];
+}
+
+static inline int pfn_valid(int pfn)
+{
+	int nid = pfn_to_nid(pfn);
+
+	if (nid >= 0)
+		return (pfn < node_end_pfn(nid));
+	return 0;
+}
+
+#endif
+#endif /* _PARISC_MMZONE_H */