m68k: discontinuous memory support

Fix support for discontinuous memory

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 41 insertions, 11 deletions

diff --git a/include/asm-m68k/page.h b/include/asm-m68k/page.h
index 7650b99dcae..9e6d0d6debd 100644
--- a/include/asm-m68k/page.h
+++ b/include/asm-m68k/page.h
@@ -121,7 +121,6 @@ extern unsigned long m68k_memoffset;
 #ifndef CONFIG_SUN3
 
 #define WANT_PAGE_VIRTUAL
-#ifdef CONFIG_SINGLE_MEMORY_CHUNK
 
 static inline unsigned long ___pa(void *vaddr)
 {
@@ -133,7 +132,7 @@ static inline unsigned long ___pa(void *vaddr)
                 : "0" (vaddr), "i" (m68k_fixup_memoffset));
         return paddr;
 }
-#define __pa(vaddr)    ___pa((void *)(vaddr))
+#define __pa(vaddr)     ___pa((void *)(vaddr))
 static inline void *__va(unsigned long paddr)
 {
         void *vaddr;
@@ -145,11 +144,6 @@ static inline void *__va(unsigned long paddr)
         return vaddr;
 }
 
-#else
-#define __pa(vaddr)             virt_to_phys((void *)(vaddr))
-#define __va(paddr)             phys_to_virt((unsigned long)(paddr))
-#endif
-
 #else   /* !CONFIG_SUN3 */
 /* This #define is a horrible hack to suppress lots of warnings. --m */
 #define __pa(x) ___pa((unsigned long)(x))
@@ -184,11 +178,47 @@ static inline void *__va(unsigned long x)
 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 
-#define virt_to_page(kaddr)     (mem_map + (((unsigned long)(kaddr)-PAGE_OFFSET) >> PAGE_SHIFT))
-#define page_to_virt(page)      ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
+extern int m68k_virt_to_node_shift;
+
+#ifdef CONFIG_SINGLE_MEMORY_CHUNK
+#define __virt_to_node(addr)    (&pg_data_map[0])
+#else
+extern struct pglist_data *pg_data_table[];
+
+static inline __attribute_const__ int __virt_to_node_shift(void)
+{
+        int shift;
+
+        asm (
+                "1:     moveq   #0,%0\n"
+                m68k_fixup(%c1, 1b)
+                : "=d" (shift)
+                : "i" (m68k_fixup_vnode_shift));
+        return shift;
+}
+
+#define __virt_to_node(addr)    (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
+#endif
 
-#define pfn_to_page(pfn)        virt_to_page(pfn_to_virt(pfn))
-#define page_to_pfn(page)       virt_to_pfn(page_to_virt(page))
+#define virt_to_page(addr) ({                                           \
+        pfn_to_page(virt_to_pfn(addr));                                 \
+})
+#define page_to_virt(page) ({                                           \
+        pfn_to_virt(page_to_pfn(page));                                 \
+})
+
+#define pfn_to_page(pfn) ({                                             \
+        unsigned long __pfn = (pfn);                                    \
+        struct pglist_data *pgdat;                                      \
+        pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));      \
+        pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);          \
+})
+#define page_to_pfn(_page) ({                                           \
+        struct page *__p = (_page);                                     \
+        struct pglist_data *pgdat;                                      \
+        pgdat = &pg_data_map[page_to_nid(__p)];                         \
+        ((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;          \
+})
 
 #define virt_addr_valid(kaddr)  ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
 #define pfn_valid(pfn)          virt_addr_valid(pfn_to_virt(pfn))