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-rw-r--r--include/asm-x86_64/dma.h11
-rw-r--r--include/asm-x86_64/proto.h2
-rw-r--r--include/linux/gfp.h11
-rw-r--r--include/linux/mmzone.h16
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
/*
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