4 files changed, 31 insertions, 9 deletions

diff --git a/include/asm-x86_64/dma.h b/include/asm-x86_64/dma.h
index 16fa3a064d0c..6f2a817b6a7c 100644
--- a/include/asm-x86_64/dma.h
+++ b/include/asm-x86_64/dma.h
@@ -72,8 +72,15 @@
 
 #define MAX_DMA_CHANNELS        8
 
-/* The maximum address that we can perform a DMA transfer to on this platform */
-#define MAX_DMA_ADDRESS      (PAGE_OFFSET+0x1000000)
+
+/* 16MB ISA DMA zone */
+#define MAX_DMA_PFN   ((16*1024*1024) >> PAGE_SHIFT)
+
+/* 4GB broken PCI/AGP hardware bus master zone */
+#define MAX_DMA32_PFN ((4UL*1024*1024*1024) >> PAGE_SHIFT)
+
+/* Compat define for old dma zone */
+#define MAX_DMA_ADDRESS ((unsigned long)__va(MAX_DMA_PFN << PAGE_SHIFT))
 
 /* 8237 DMA controllers */
 #define IO_DMA1_BASE    0x00    /* 8 bit slave DMA, channels 0..3 */
diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h
index dbb37b0adb43..c251152a0658 100644
--- a/include/asm-x86_64/proto.h
+++ b/include/asm-x86_64/proto.h
@@ -22,6 +22,8 @@ extern void mtrr_bp_init(void);
 #define mtrr_bp_init() do {} while (0)
 #endif
 extern void init_memory_mapping(unsigned long start, unsigned long end);
+extern void size_zones(unsigned long *z, unsigned long *h,
+                        unsigned long start_pfn, unsigned long end_pfn);
 
 extern void system_call(void); 
 extern int kernel_syscall(void);
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index c3779432a723..4351e6bb5a79 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -14,6 +14,13 @@ struct vm_area_struct;
 /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low two bits) */
 #define __GFP_DMA       ((__force gfp_t)0x01u)
 #define __GFP_HIGHMEM   ((__force gfp_t)0x02u)
+#ifdef CONFIG_DMA_IS_DMA32
+#define __GFP_DMA32     ((__force gfp_t)0x01)   /* ZONE_DMA is ZONE_DMA32 */
+#elif BITS_PER_LONG < 64
+#define __GFP_DMA32     ((__force gfp_t)0x00)   /* ZONE_NORMAL is ZONE_DMA32 */
+#else
+#define __GFP_DMA32     ((__force gfp_t)0x04)   /* Has own ZONE_DMA32 */
+#endif
 
 /*
  * Action modifiers - doesn't change the zoning
@@ -64,6 +71,10 @@ struct vm_area_struct;
 
 #define GFP_DMA         __GFP_DMA
 
+/* 4GB DMA on some platforms */
+#define GFP_DMA32       __GFP_DMA32
+
+
 #define gfp_zone(mask) ((__force int)((mask) & (__force gfp_t)GFP_ZONEMASK))
 
 /*
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index f5fa3082fd6a..da7a829f8561 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -71,10 +71,11 @@ struct per_cpu_pageset {
 #endif
 
 #define ZONE_DMA                0
-#define ZONE_NORMAL             1
-#define ZONE_HIGHMEM            2
+#define ZONE_DMA32              1
+#define ZONE_NORMAL             2
+#define ZONE_HIGHMEM            3
 
-#define MAX_NR_ZONES            3       /* Sync this with ZONES_SHIFT */
+#define MAX_NR_ZONES            4       /* Sync this with ZONES_SHIFT */
 #define ZONES_SHIFT             2       /* ceil(log2(MAX_NR_ZONES)) */
 
 
@@ -108,9 +109,10 @@ struct per_cpu_pageset {
 
 /*
  * On machines where it is needed (eg PCs) we divide physical memory
- * into multiple physical zones. On a PC we have 3 zones:
+ * into multiple physical zones. On a PC we have 4 zones:
  *
  * ZONE_DMA       < 16 MB       ISA DMA capable memory
+ * ZONE_DMA32        0 MB       Empty
  * ZONE_NORMAL  16-896 MB       direct mapped by the kernel
  * ZONE_HIGHMEM  > 896 MB       only page cache and user processes
  */
@@ -455,10 +457,10 @@ extern struct pglist_data contig_page_data;
 
 #if BITS_PER_LONG == 32 || defined(ARCH_HAS_ATOMIC_UNSIGNED)
 /*
- * with 32 bit page->flags field, we reserve 8 bits for node/zone info.
- * there are 3 zones (2 bits) and this leaves 8-2=6 bits for nodes.
+ * with 32 bit page->flags field, we reserve 9 bits for node/zone info.
+ * there are 4 zones (3 bits) and this leaves 9-3=6 bits for nodes.
  */
-#define FLAGS_RESERVED          8
+#define FLAGS_RESERVED          9
 
 #elif BITS_PER_LONG == 64
 /*