1 files changed, 102 insertions, 0 deletions

diff --git a/include/asm-parisc/mmzone.h b/include/asm-parisc/mmzone.h
new file mode 100644
index 000000000000..928bf50c4693
--- /dev/null
+++ b/include/asm-parisc/mmzone.h
@@ -0,0 +1,102 @@
+#ifndef _PARISC_MMZONE_H
+#define _PARISC_MMZONE_H
+
+#ifdef CONFIG_DISCONTIGMEM
+
+#define MAX_PHYSMEM_RANGES 8 /* Fix the size for now (current known max is 3) */
+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)
+
+/*
+ * Given a kernel address, find the home node of the underlying memory.
+ */
+#define kvaddr_to_nid(kaddr)    pfn_to_nid(__pa(kaddr) >> PAGE_SHIFT)
+
+#define node_mem_map(nid)       (NODE_DATA(nid)->node_mem_map)
+#define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
+#define node_end_pfn(nid)                                               \
+({                                                                      \
+        pg_data_t *__pgdat = NODE_DATA(nid);                            \
+        __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
+})
+#define node_localnr(pfn, nid)          ((pfn) - node_start_pfn(nid))
+
+#define local_mapnr(kvaddr)                                             \
+({                                                                      \
+        unsigned long __pfn = __pa(kvaddr) >> PAGE_SHIFT;               \
+        (__pfn - node_start_pfn(pfn_to_nid(__pfn)));                    \
+})
+
+#define pfn_to_page(pfn)                                                \
+({                                                                      \
+        unsigned long __pfn = (pfn);                                    \
+        int __node  = pfn_to_nid(__pfn);                                \
+        &node_mem_map(__node)[node_localnr(__pfn,__node)];              \
+})
+
+#define page_to_pfn(pg)                                                 \
+({                                                                      \
+        struct page *__page = pg;                                       \
+        struct zone *__zone = page_zone(__page);                        \
+        BUG_ON(__zone == NULL);                                         \
+        (unsigned long)(__page - __zone->zone_mem_map)                  \
+                + __zone->zone_start_pfn;                               \
+})
+
+/* 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 unsigned char pfnnid_map[PFNNID_MAP_MAX];
+
+#ifndef __LP64__
+#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;
+        unsigned char r;
+
+        if (unlikely(pfn_is_io(pfn)))
+                return 0;
+
+        i = pfn >> PFNNID_SHIFT;
+        BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
+        r = pfnnid_map[i];
+        BUG_ON(r == 0xff);
+
+        return (int)r;
+}
+
+static inline int pfn_valid(int pfn)
+{
+        int nid = pfn_to_nid(pfn);
+
+        if (nid >= 0)
+                return (pfn < node_end_pfn(nid));
+        return 0;
+}
+
+#else /* !CONFIG_DISCONTIGMEM */
+#define MAX_PHYSMEM_RANGES      1 
+#endif
+#endif /* _PARISC_MMZONE_H */