[linux.git] / arch / alpha / mm / numa.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/arch/alpha/mm/numa.c
 *
 *  DISCONTIGMEM NUMA alpha support.
 *
 *  Copyright (C) 2001 Andrea Arcangeli <[email protected]> SuSE
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/swap.h>
#include <linux/initrd.h>
#include <linux/pfn.h>
#include <linux/module.h>

#include <asm/hwrpb.h>
#include <asm/pgalloc.h>
#include <asm/sections.h>

pg_data_t node_data[MAX_NUMNODES];
EXPORT_SYMBOL(node_data);

#undef DEBUG_DISCONTIG
#ifdef DEBUG_DISCONTIG
#define DBGDCONT(args...) printk(args)
#else
#define DBGDCONT(args...)
#endif

#define for_each_mem_cluster(memdesc, _cluster, i)		\
	for ((_cluster) = (memdesc)->cluster, (i) = 0;		\
	     (i) < (memdesc)->numclusters; (i)++, (_cluster)++)

static void __init show_mem_layout(void)
{
	struct memclust_struct * cluster;
	struct memdesc_struct * memdesc;
	int i;

	/* Find free clusters, and init and free the bootmem accordingly.  */
	memdesc = (struct memdesc_struct *)
	  (hwrpb->mddt_offset + (unsigned long) hwrpb);

	printk("Raw memory layout:\n");
	for_each_mem_cluster(memdesc, cluster, i) {
		printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
		       i, cluster->usage, cluster->start_pfn,
		       cluster->start_pfn + cluster->numpages);
	}
}

static void __init
setup_memory_node(int nid, void *kernel_end)
{
	extern unsigned long mem_size_limit;
	struct memclust_struct * cluster;
	struct memdesc_struct * memdesc;
	unsigned long start_kernel_pfn, end_kernel_pfn;
	unsigned long bootmap_size, bootmap_pages, bootmap_start;
	unsigned long start, end;
	unsigned long node_pfn_start, node_pfn_end;
	unsigned long node_min_pfn, node_max_pfn;
	int i;
	unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
	int show_init = 0;

	/* Find the bounds of current node */
	node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
	node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
	
	/* Find free clusters, and init and free the bootmem accordingly.  */
	memdesc = (struct memdesc_struct *)
	  (hwrpb->mddt_offset + (unsigned long) hwrpb);

	/* find the bounds of this node (node_min_pfn/node_max_pfn) */
	node_min_pfn = ~0UL;
	node_max_pfn = 0UL;
	for_each_mem_cluster(memdesc, cluster, i) {
		/* Bit 0 is console/PALcode reserved.  Bit 1 is
		   non-volatile memory -- we might want to mark
		   this for later.  */
		if (cluster->usage & 3)
			continue;

		start = cluster->start_pfn;
		end = start + cluster->numpages;

		if (start >= node_pfn_end || end <= node_pfn_start)
			continue;

		if (!show_init) {
			show_init = 1;
			printk("Initializing bootmem allocator on Node ID %d\n", nid);
		}
		printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
		       i, cluster->usage, cluster->start_pfn,
		       cluster->start_pfn + cluster->numpages);

		if (start < node_pfn_start)
			start = node_pfn_start;
		if (end > node_pfn_end)
			end = node_pfn_end;

		if (start < node_min_pfn)
			node_min_pfn = start;
		if (end > node_max_pfn)
			node_max_pfn = end;
	}

	if (mem_size_limit && node_max_pfn > mem_size_limit) {
		static int msg_shown = 0;
		if (!msg_shown) {
			msg_shown = 1;
			printk("setup: forcing memory size to %ldK (from %ldK).\n",
			       mem_size_limit << (PAGE_SHIFT - 10),
			       node_max_pfn    << (PAGE_SHIFT - 10));
		}
		node_max_pfn = mem_size_limit;
	}

	if (node_min_pfn >= node_max_pfn)
		return;

	/* Update global {min,max}_low_pfn from node information. */
	if (node_min_pfn < min_low_pfn)
		min_low_pfn = node_min_pfn;
	if (node_max_pfn > max_low_pfn)
		max_pfn = max_low_pfn = node_max_pfn;

#if 0 /* we'll try this one again in a little while */
	/* Cute trick to make sure our local node data is on local memory */
	node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
#endif
	/* Quasi-mark the pg_data_t as in-use */
	node_min_pfn += node_datasz;
	if (node_min_pfn >= node_max_pfn) {
		printk(" not enough mem to reserve NODE_DATA");
		return;
	}
	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];

	printk(" Detected node memory:   start %8lu, end %8lu\n",
	       node_min_pfn, node_max_pfn);

	DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
	DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);

	/* Find the bounds of kernel memory.  */
	start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
	end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
	bootmap_start = -1;

	if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
		panic("kernel loaded out of ram");

	/* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
	   Note that we round this down, not up - node memory
	   has much larger alignment than 8Mb, so it's safe. */
	node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);

	/* We need to know how many physically contiguous pages
	   we'll need for the bootmap.  */
	bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);

	/* Now find a good region where to allocate the bootmap.  */
	for_each_mem_cluster(memdesc, cluster, i) {
		if (cluster->usage & 3)
			continue;

		start = cluster->start_pfn;
		end = start + cluster->numpages;

		if (start >= node_max_pfn || end <= node_min_pfn)
			continue;

		if (end > node_max_pfn)
			end = node_max_pfn;
		if (start < node_min_pfn)
			start = node_min_pfn;

		if (start < start_kernel_pfn) {
			if (end > end_kernel_pfn
			    && end - end_kernel_pfn >= bootmap_pages) {
				bootmap_start = end_kernel_pfn;
				break;
			} else if (end > start_kernel_pfn)
				end = start_kernel_pfn;
		} else if (start < end_kernel_pfn)
			start = end_kernel_pfn;
		if (end - start >= bootmap_pages) {
			bootmap_start = start;
			break;
		}
	}

	if (bootmap_start == -1)
		panic("couldn't find a contiguous place for the bootmap");

	/* Allocate the bootmap and mark the whole MM as reserved.  */
	bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
					 node_min_pfn, node_max_pfn);
	DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
		 bootmap_start, bootmap_size, bootmap_pages);

	/* Mark the free regions.  */
	for_each_mem_cluster(memdesc, cluster, i) {
		if (cluster->usage & 3)
			continue;

		start = cluster->start_pfn;
		end = cluster->start_pfn + cluster->numpages;

		if (start >= node_max_pfn || end <= node_min_pfn)
			continue;

		if (end > node_max_pfn)
			end = node_max_pfn;
		if (start < node_min_pfn)
			start = node_min_pfn;

		if (start < start_kernel_pfn) {
			if (end > end_kernel_pfn) {
				free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
					     (PFN_PHYS(start_kernel_pfn)
					      - PFN_PHYS(start)));
				printk(" freeing pages %ld:%ld\n",
				       start, start_kernel_pfn);
				start = end_kernel_pfn;
			} else if (end > start_kernel_pfn)
				end = start_kernel_pfn;
		} else if (start < end_kernel_pfn)
			start = end_kernel_pfn;
		if (start >= end)
			continue;

		free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
		printk(" freeing pages %ld:%ld\n", start, end);
	}

	/* Reserve the bootmap memory.  */
	reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start),
			bootmap_size, BOOTMEM_DEFAULT);
	printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));

	node_set_online(nid);
}

void __init
setup_memory(void *kernel_end)
{
	int nid;

	show_mem_layout();

	nodes_clear(node_online_map);

	min_low_pfn = ~0UL;
	max_low_pfn = 0UL;
	for (nid = 0; nid < MAX_NUMNODES; nid++)
		setup_memory_node(nid, kernel_end);

#ifdef CONFIG_BLK_DEV_INITRD
	initrd_start = INITRD_START;
	if (initrd_start) {
		extern void *move_initrd(unsigned long);

		initrd_end = initrd_start+INITRD_SIZE;
		printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
		       (void *) initrd_start, INITRD_SIZE);

		if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
			if (!move_initrd(PFN_PHYS(max_low_pfn)))
				printk("initrd extends beyond end of memory "
				       "(0x%08lx > 0x%p)\ndisabling initrd\n",
				       initrd_end,
				       phys_to_virt(PFN_PHYS(max_low_pfn)));
		} else {
			nid = kvaddr_to_nid(initrd_start);
			reserve_bootmem_node(NODE_DATA(nid),
					     virt_to_phys((void *)initrd_start),
					     INITRD_SIZE, BOOTMEM_DEFAULT);
		}
	}
#endif /* CONFIG_BLK_DEV_INITRD */
}

void __init paging_init(void)
{
	unsigned int    nid;
	unsigned long   zones_size[MAX_NR_ZONES] = {0, };
	unsigned long	dma_local_pfn;

	/*
	 * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
	 * in the NUMA model, for now we convert it to a pfn and
	 * we interpret this pfn as a local per-node information.
	 * This issue isn't very important since none of these machines
	 * have legacy ISA slots anyways.
	 */
	dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;

	for_each_online_node(nid) {
		bootmem_data_t *bdata = &bootmem_node_data[nid];
		unsigned long start_pfn = bdata->node_min_pfn;
		unsigned long end_pfn = bdata->node_low_pfn;

		if (dma_local_pfn >= end_pfn - start_pfn)
			zones_size[ZONE_DMA] = end_pfn - start_pfn;
		else {
			zones_size[ZONE_DMA] = dma_local_pfn;
			zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
		}
		node_set_state(nid, N_NORMAL_MEMORY);
		free_area_init_node(nid, zones_size, start_pfn, NULL);
	}

	/* Initialize the kernel's ZERO_PGE. */
	memset((void *)ZERO_PGE, 0, PAGE_SIZE);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/arch/alpha/mm/numa.c
	4	*
	5	* DISCONTIGMEM NUMA alpha support.
	6	*
	7	* Copyright (C) 2001 Andrea Arcangeli <[email protected]> SuSE
	8	*/
	9
1da177e4 LT	10	#include <linux/types.h>
	11	#include <linux/kernel.h>
	12	#include <linux/mm.h>
	13	#include <linux/bootmem.h>
	14	#include <linux/swap.h>
	15	#include <linux/initrd.h>
22a9835c	16	#include <linux/pfn.h>
cff52daf	17	#include <linux/module.h>
1da177e4 LT	18
	19	#include <asm/hwrpb.h>
	20	#include <asm/pgalloc.h>
f3beeb4a	21	#include <asm/sections.h>
1da177e4 LT	22
1da177e4 LT	23	pg_data_t node_data[MAX_NUMNODES];
cff52daf	24	EXPORT_SYMBOL(node_data);
1da177e4 LT	25
	26	#undef DEBUG_DISCONTIG
	27	#ifdef DEBUG_DISCONTIG
	28	#define DBGDCONT(args...) printk(args)
	29	#else
	30	#define DBGDCONT(args...)
	31	#endif
	32
fb26b3e6 RK	33	#define for_each_mem_cluster(memdesc, _cluster, i) \
	34	for ((_cluster) = (memdesc)->cluster, (i) = 0; \
	35	(i) < (memdesc)->numclusters; (i)++, (_cluster)++)
1da177e4 LT	36
	37	static void __init show_mem_layout(void)
	38	{
	39	struct memclust_struct * cluster;
	40	struct memdesc_struct * memdesc;
	41	int i;
	42
	43	/* Find free clusters, and init and free the bootmem accordingly. */
	44	memdesc = (struct memdesc_struct *)
	45	(hwrpb->mddt_offset + (unsigned long) hwrpb);
	46
	47	printk("Raw memory layout:\n");
	48	for_each_mem_cluster(memdesc, cluster, i) {
	49	printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
	50	i, cluster->usage, cluster->start_pfn,
	51	cluster->start_pfn + cluster->numpages);
	52	}
	53	}
	54
	55	static void __init
	56	setup_memory_node(int nid, void *kernel_end)
	57	{
	58	extern unsigned long mem_size_limit;
	59	struct memclust_struct * cluster;
	60	struct memdesc_struct * memdesc;
	61	unsigned long start_kernel_pfn, end_kernel_pfn;
	62	unsigned long bootmap_size, bootmap_pages, bootmap_start;
	63	unsigned long start, end;
	64	unsigned long node_pfn_start, node_pfn_end;
	65	unsigned long node_min_pfn, node_max_pfn;
	66	int i;
	67	unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
	68	int show_init = 0;
	69
	70	/* Find the bounds of current node */
	71	node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
	72	node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
	73
	74	/* Find free clusters, and init and free the bootmem accordingly. */
	75	memdesc = (struct memdesc_struct *)
	76	(hwrpb->mddt_offset + (unsigned long) hwrpb);
	77
	78	/* find the bounds of this node (node_min_pfn/node_max_pfn) */
	79	node_min_pfn = ~0UL;
	80	node_max_pfn = 0UL;
	81	for_each_mem_cluster(memdesc, cluster, i) {
	82	/* Bit 0 is console/PALcode reserved. Bit 1 is
	83	non-volatile memory -- we might want to mark
	84	this for later. */
	85	if (cluster->usage & 3)
	86	continue;
	87
	88	start = cluster->start_pfn;
	89	end = start + cluster->numpages;
	90
	91	if (start >= node_pfn_end \|\| end <= node_pfn_start)
	92	continue;
	93
	94	if (!show_init) {
	95	show_init = 1;
	96	printk("Initializing bootmem allocator on Node ID %d\n", nid);
	97	}
	98	printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
	99	i, cluster->usage, cluster->start_pfn,
100	cluster->start_pfn + cluster->numpages);
101
102	if (start < node_pfn_start)
103	start = node_pfn_start;
104	if (end > node_pfn_end)
105	end = node_pfn_end;
106
107	if (start < node_min_pfn)
108	node_min_pfn = start;
109	if (end > node_max_pfn)
110	node_max_pfn = end;
111	}
112
113	if (mem_size_limit && node_max_pfn > mem_size_limit) {
114	static int msg_shown = 0;
115	if (!msg_shown) {
116	msg_shown = 1;
117	printk("setup: forcing memory size to %ldK (from %ldK).\n",
118	mem_size_limit << (PAGE_SHIFT - 10),
119	node_max_pfn << (PAGE_SHIFT - 10));
120	}
121	node_max_pfn = mem_size_limit;
122	}
123
124	if (node_min_pfn >= node_max_pfn)
125	return;
126
127	/* Update global {min,max}_low_pfn from node information. */
128	if (node_min_pfn < min_low_pfn)
129	min_low_pfn = node_min_pfn;
130	if (node_max_pfn > max_low_pfn)
131	max_pfn = max_low_pfn = node_max_pfn;
132
1da177e4 LT	133	#if 0 /* we'll try this one again in a little while */
	134	/* Cute trick to make sure our local node data is on local memory */
	135	node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
	136	#endif
	137	/* Quasi-mark the pg_data_t as in-use */
	138	node_min_pfn += node_datasz;
	139	if (node_min_pfn >= node_max_pfn) {
	140	printk(" not enough mem to reserve NODE_DATA");
	141	return;
	142	}
b61bfa3c	143	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
1da177e4 LT	144
	145	printk(" Detected node memory: start %8lu, end %8lu\n",
	146	node_min_pfn, node_max_pfn);
	147
	148	DBGDCONT(" DISCONTIG: node_data[%d] is at 0x%p\n", nid, NODE_DATA(nid));
	149	DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
	150
	151	/* Find the bounds of kernel memory. */
	152	start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
	153	end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
	154	bootmap_start = -1;
	155
	156	if (!nid && (node_max_pfn < end_kernel_pfn \|\| node_min_pfn > start_kernel_pfn))
	157	panic("kernel loaded out of ram");
	158
	159	/* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
	160	Note that we round this down, not up - node memory
	161	has much larger alignment than 8Mb, so it's safe. */
	162	node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
	163
	164	/* We need to know how many physically contiguous pages
	165	we'll need for the bootmap. */
	166	bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
	167
	168	/* Now find a good region where to allocate the bootmap. */
	169	for_each_mem_cluster(memdesc, cluster, i) {
	170	if (cluster->usage & 3)
	171	continue;
	172
	173	start = cluster->start_pfn;
	174	end = start + cluster->numpages;
	175
	176	if (start >= node_max_pfn \|\| end <= node_min_pfn)
	177	continue;
	178
	179	if (end > node_max_pfn)
	180	end = node_max_pfn;
	181	if (start < node_min_pfn)
	182	start = node_min_pfn;
	183
	184	if (start < start_kernel_pfn) {
	185	if (end > end_kernel_pfn
	186	&& end - end_kernel_pfn >= bootmap_pages) {
	187	bootmap_start = end_kernel_pfn;
	188	break;
	189	} else if (end > start_kernel_pfn)
	190	end = start_kernel_pfn;
	191	} else if (start < end_kernel_pfn)
	192	start = end_kernel_pfn;
	193	if (end - start >= bootmap_pages) {
	194	bootmap_start = start;
	195	break;
	196	}
	197	}
	198
	199	if (bootmap_start == -1)
af901ca1	200	panic("couldn't find a contiguous place for the bootmap");
1da177e4 LT	201
	202	/* Allocate the bootmap and mark the whole MM as reserved. */
	203	bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
	204	node_min_pfn, node_max_pfn);
	205	DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
	206	bootmap_start, bootmap_size, bootmap_pages);
	207
	208	/* Mark the free regions. */
	209	for_each_mem_cluster(memdesc, cluster, i) {
	210	if (cluster->usage & 3)
	211	continue;
	212
	213	start = cluster->start_pfn;
	214	end = cluster->start_pfn + cluster->numpages;
	215
	216	if (start >= node_max_pfn \|\| end <= node_min_pfn)
	217	continue;
	218
	219	if (end > node_max_pfn)
	220	end = node_max_pfn;
	221	if (start < node_min_pfn)
	222	start = node_min_pfn;
	223
	224	if (start < start_kernel_pfn) {
	225	if (end > end_kernel_pfn) {
	226	free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
	227	(PFN_PHYS(start_kernel_pfn)
	228	- PFN_PHYS(start)));
	229	printk(" freeing pages %ld:%ld\n",
	230	start, start_kernel_pfn);
	231	start = end_kernel_pfn;
	232	} else if (end > start_kernel_pfn)
	233	end = start_kernel_pfn;
	234	} else if (start < end_kernel_pfn)
	235	start = end_kernel_pfn;
	236	if (start >= end)
	237	continue;
	238
	239	free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
	240	printk(" freeing pages %ld:%ld\n", start, end);
	241	}
	242
	243	/* Reserve the bootmap memory. */
72a7fe39 BW	244	reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start),
72a7fe39 BW	245	bootmap_size, BOOTMEM_DEFAULT);
1da177e4 LT	246	printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
	247
	248	node_set_online(nid);
	249	}
	250
	251	void __init
	252	setup_memory(void *kernel_end)
	253	{
	254	int nid;
	255
	256	show_mem_layout();
	257
	258	nodes_clear(node_online_map);
	259
	260	min_low_pfn = ~0UL;
	261	max_low_pfn = 0UL;
	262	for (nid = 0; nid < MAX_NUMNODES; nid++)
	263	setup_memory_node(nid, kernel_end);
	264
	265	#ifdef CONFIG_BLK_DEV_INITRD
	266	initrd_start = INITRD_START;
	267	if (initrd_start) {
	268	extern void *move_initrd(unsigned long);
	269
	270	initrd_end = initrd_start+INITRD_SIZE;
	271	printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
	272	(void *) initrd_start, INITRD_SIZE);
	273
	274	if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
	275	if (!move_initrd(PFN_PHYS(max_low_pfn)))
	276	printk("initrd extends beyond end of memory "
	277	"(0x%08lx > 0x%p)\ndisabling initrd\n",
	278	initrd_end,
	279	phys_to_virt(PFN_PHYS(max_low_pfn)));
	280	} else {
	281	nid = kvaddr_to_nid(initrd_start);
	282	reserve_bootmem_node(NODE_DATA(nid),
	283	virt_to_phys((void *)initrd_start),
72a7fe39	284	INITRD_SIZE, BOOTMEM_DEFAULT);
1da177e4 LT	285	}
	286	}
	287	#endif /* CONFIG_BLK_DEV_INITRD */
	288	}
	289
	290	void __init paging_init(void)
	291	{
	292	unsigned int nid;
	293	unsigned long zones_size[MAX_NR_ZONES] = {0, };
	294	unsigned long dma_local_pfn;
	295
	296	/*
	297	* The old global MAX_DMA_ADDRESS per-arch API doesn't fit
	298	* in the NUMA model, for now we convert it to a pfn and
	299	* we interpret this pfn as a local per-node information.
	300	* This issue isn't very important since none of these machines
	301	* have legacy ISA slots anyways.
	302	*/
	303	dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	304
	305	for_each_online_node(nid) {
b61bfa3c	306	bootmem_data_t *bdata = &bootmem_node_data[nid];
3560e249	307	unsigned long start_pfn = bdata->node_min_pfn;
b61bfa3c	308	unsigned long end_pfn = bdata->node_low_pfn;
1da177e4 LT	309
	310	if (dma_local_pfn >= end_pfn - start_pfn)
	311	zones_size[ZONE_DMA] = end_pfn - start_pfn;
	312	else {
	313	zones_size[ZONE_DMA] = dma_local_pfn;
	314	zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
	315	}
ad8b4b28	316	node_set_state(nid, N_NORMAL_MEMORY);
9109fb7b	317	free_area_init_node(nid, zones_size, start_pfn, NULL);
1da177e4 LT	318	}
	319
	320	/* Initialize the kernel's ZERO_PGE. */
	321	memset((void *)ZERO_PGE, 0, PAGE_SIZE);
	322	}