patch-2.3.30 linux/include/linux/mmzone.h

• Lines: 116
• Date: Mon Dec 6 17:22:07 1999
• Orig file: v2.3.29/linux/include/linux/mmzone.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.29/linux/include/linux/mmzone.h linux/include/linux/mmzone.h
@@ -0,0 +1,115 @@
+#ifndef _LINUX_MMZONE_H
+#define _LINUX_MMZONE_H
+
+#ifdef __KERNEL__
+#ifndef __ASSEMBLY__
+
+#include <linux/config.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+
+/*
+ * Free memory management - zoned buddy allocator.
+ */
+
+#if CONFIG_AP1000
+/* the AP+ needs to allocate 8MB contiguous, aligned chunks of ram
+   for the ring buffers */
+#define MAX_ORDER 12
+#else
+#define MAX_ORDER 10
+#endif
+
+typedef struct free_area_struct {
+	struct list_head free_list;
+	unsigned int * map;
+} free_area_t;
+
+typedef struct zone_struct {
+	/*
+	 * Commonly accessed fields:
+	 */
+	spinlock_t lock;
+	unsigned long offset;
+	unsigned long free_pages;
+	int low_on_memory;
+	unsigned long pages_low, pages_high;
+
+	/*
+	 * free areas of different sizes
+	 */
+	free_area_t free_area[MAX_ORDER];
+
+	/*
+	 * rarely used fields:
+	 */
+	char * name;
+	unsigned long size;
+} zone_t;
+
+#define ZONE_DMA		0
+#define ZONE_NORMAL		1
+#define ZONE_HIGHMEM		2
+#define MAX_NR_ZONES		3
+
+/*
+ * One allocation request operates on a zonelist. A zonelist
+ * is a list of zones, the first one is the 'goal' of the
+ * allocation, the other zones are fallback zones, in decreasing
+ * priority.
+ *
+ * Right now a zonelist takes up less than a cacheline. We never
+ * modify it apart from boot-up, and only a few indices are used,
+ * so despite the zonelist table being relatively big, the cache
+ * footprint of this construct is very small.
+ */
+typedef struct zonelist_struct {
+	zone_t * zones [MAX_NR_ZONES+1]; // NULL delimited
+	int gfp_mask;
+} zonelist_t;
+
+#define NR_GFPINDEX		0x100
+
+struct bootmem_data;
+typedef struct pglist_data {
+	zone_t node_zones[MAX_NR_ZONES];
+	zonelist_t node_zonelists[NR_GFPINDEX];
+	struct page *node_mem_map;
+	unsigned long *valid_addr_bitmap;
+	struct bootmem_data *bdata;
+} pg_data_t;
+
+extern int numnodes;
+
+#ifndef CONFIG_DISCONTIGMEM
+
+extern pg_data_t contig_page_data;
+
+#define NODE_DATA(nid)		(&contig_page_data)
+#define NODE_MEM_MAP(nid)	mem_map
+
+#else /* !CONFIG_DISCONTIGMEM */
+
+#include <asm/mmzone.h>
+
+#endif /* !CONFIG_DISCONTIGMEM */
+
+#define MAP_ALIGN(x)	((((x) % sizeof(mem_map_t)) == 0) ? (x) : ((x) + \
+		sizeof(mem_map_t) - ((x) % sizeof(mem_map_t))))
+
+#ifdef CONFIG_DISCONTIGMEM
+
+#define LOCAL_MAP_NR(kvaddr) \
+	(((unsigned long)(kvaddr)-LOCAL_BASE_ADDR((kvaddr))) >> PAGE_SHIFT)
+#define MAP_NR(kaddr)	(LOCAL_MAP_NR((kaddr)) + \
+		(((unsigned long)ADDR_TO_MAPBASE((kaddr)) - PAGE_OFFSET) / \
+		sizeof(mem_map_t)))
+#define kern_addr_valid(addr)	((KVADDR_TO_NID((unsigned long)addr) >= \
+	numnodes) ? 0 : (test_bit(LOCAL_MAP_NR((addr)), \
+	NODE_DATA(KVADDR_TO_NID((unsigned long)addr))->valid_addr_bitmap)))
+
+#endif /* CONFIG_DISCONTIGMEM */
+
+#endif /* !__ASSEMBLY__ */
+#endif /* __KERNEL__ */
+#endif /* _LINUX_MMZONE_H */