Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / asm-generic / memory_model.h

diff --git a/kernel/include/asm-generic/memory_model.h b/kernel/include/asm-generic/memory_model.h
new file mode 100644 (file)
index 0000000..14909b0
--- /dev/null
+++ b/kernel/include/asm-generic/memory_model.h
@@ -0,0 +1,77 @@
+#ifndef __ASM_MEMORY_MODEL_H
+#define __ASM_MEMORY_MODEL_H
+
+#ifndef __ASSEMBLY__
+
+#if defined(CONFIG_FLATMEM)
+
+#ifndef ARCH_PFN_OFFSET
+#define ARCH_PFN_OFFSET                (0UL)
+#endif
+
+#elif defined(CONFIG_DISCONTIGMEM)
+
+#ifndef arch_pfn_to_nid
+#define arch_pfn_to_nid(pfn)   pfn_to_nid(pfn)
+#endif
+
+#ifndef arch_local_page_offset
+#define arch_local_page_offset(pfn, nid)       \
+       ((pfn) - NODE_DATA(nid)->node_start_pfn)
+#endif
+
+#endif /* CONFIG_DISCONTIGMEM */
+
+/*
+ * supports 3 memory models.
+ */
+#if defined(CONFIG_FLATMEM)
+
+#define __pfn_to_page(pfn)     (mem_map + ((pfn) - ARCH_PFN_OFFSET))
+#define __page_to_pfn(page)    ((unsigned long)((page) - mem_map) + \
+                                ARCH_PFN_OFFSET)
+#elif defined(CONFIG_DISCONTIGMEM)
+
+#define __pfn_to_page(pfn)                     \
+({     unsigned long __pfn = (pfn);            \
+       unsigned long __nid = arch_pfn_to_nid(__pfn);  \
+       NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
+})
+
+#define __page_to_pfn(pg)                                              \
+({     const struct page *__pg = (pg);                                 \
+       struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg));     \
+       (unsigned long)(__pg - __pgdat->node_mem_map) +                 \
+        __pgdat->node_start_pfn;                                       \
+})
+
+#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
+
+/* memmap is virtually contiguous.  */
+#define __pfn_to_page(pfn)     (vmemmap + (pfn))
+#define __page_to_pfn(page)    (unsigned long)((page) - vmemmap)
+
+#elif defined(CONFIG_SPARSEMEM)
+/*
+ * Note: section's mem_map is encoded to reflect its start_pfn.
+ * section[i].section_mem_map == mem_map's address - start_pfn;
+ */
+#define __page_to_pfn(pg)                                      \
+({     const struct page *__pg = (pg);                         \
+       int __sec = page_to_section(__pg);                      \
+       (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \
+})
+
+#define __pfn_to_page(pfn)                             \
+({     unsigned long __pfn = (pfn);                    \
+       struct mem_section *__sec = __pfn_to_section(__pfn);    \
+       __section_mem_map_addr(__sec) + __pfn;          \
+})
+#endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
+
+#define page_to_pfn __page_to_pfn
+#define pfn_to_page __pfn_to_page
+
+#endif /* __ASSEMBLY__ */
+
+#endif