Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *  linux/arch/alpha/mm/numa.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  DISCONTIGMEM NUMA alpha support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *  Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/initrd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/pfn.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/hwrpb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) pg_data_t node_data[MAX_NUMNODES];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) EXPORT_SYMBOL(node_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #undef DEBUG_DISCONTIG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #ifdef DEBUG_DISCONTIG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define DBGDCONT(args...) printk(args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define DBGDCONT(args...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define for_each_mem_cluster(memdesc, _cluster, i)		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	for ((_cluster) = (memdesc)->cluster, (i) = 0;		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	     (i) < (memdesc)->numclusters; (i)++, (_cluster)++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static void __init show_mem_layout(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct memclust_struct * cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	struct memdesc_struct * memdesc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	/* Find free clusters, and init and free the bootmem accordingly.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	memdesc = (struct memdesc_struct *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	  (hwrpb->mddt_offset + (unsigned long) hwrpb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	printk("Raw memory layout:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	for_each_mem_cluster(memdesc, cluster, i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		       i, cluster->usage, cluster->start_pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		       cluster->start_pfn + cluster->numpages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static void __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) setup_memory_node(int nid, void *kernel_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	extern unsigned long mem_size_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	struct memclust_struct * cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	struct memdesc_struct * memdesc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	unsigned long start_kernel_pfn, end_kernel_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	unsigned long start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	unsigned long node_pfn_start, node_pfn_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	unsigned long node_min_pfn, node_max_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	int show_init = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	/* Find the bounds of current node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	/* Find free clusters, and init and free the bootmem accordingly.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	memdesc = (struct memdesc_struct *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	  (hwrpb->mddt_offset + (unsigned long) hwrpb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	/* find the bounds of this node (node_min_pfn/node_max_pfn) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	node_min_pfn = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	node_max_pfn = 0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	for_each_mem_cluster(memdesc, cluster, i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		/* Bit 0 is console/PALcode reserved.  Bit 1 is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		   non-volatile memory -- we might want to mark
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		   this for later.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		if (cluster->usage & 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		start = cluster->start_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		end = start + cluster->numpages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		if (start >= node_pfn_end || end <= node_pfn_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		if (!show_init) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			show_init = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			printk("Initializing bootmem allocator on Node ID %d\n", nid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		       i, cluster->usage, cluster->start_pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		       cluster->start_pfn + cluster->numpages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		if (start < node_pfn_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			start = node_pfn_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		if (end > node_pfn_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			end = node_pfn_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		if (start < node_min_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			node_min_pfn = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		if (end > node_max_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			node_max_pfn = end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (mem_size_limit && node_max_pfn > mem_size_limit) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		static int msg_shown = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		if (!msg_shown) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			msg_shown = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			printk("setup: forcing memory size to %ldK (from %ldK).\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			       mem_size_limit << (PAGE_SHIFT - 10),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			       node_max_pfn    << (PAGE_SHIFT - 10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		node_max_pfn = mem_size_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (node_min_pfn >= node_max_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	/* Update global {min,max}_low_pfn from node information. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (node_min_pfn < min_low_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		min_low_pfn = node_min_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (node_max_pfn > max_low_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		max_pfn = max_low_pfn = node_max_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) #if 0 /* we'll try this one again in a little while */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	/* Cute trick to make sure our local node data is on local memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	printk(" Detected node memory:   start %8lu, end %8lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	       node_min_pfn, node_max_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	/* Find the bounds of kernel memory.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		panic("kernel loaded out of ram");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	memblock_add_node(PFN_PHYS(node_min_pfn),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			  (node_max_pfn - node_min_pfn) << PAGE_SHIFT, nid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	/* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	   Note that we round this down, not up - node memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	   has much larger alignment than 8Mb, so it's safe. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	NODE_DATA(nid)->node_start_pfn = node_min_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	NODE_DATA(nid)->node_present_pages = node_max_pfn - node_min_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	node_set_online(nid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) void __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) setup_memory(void *kernel_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	unsigned long kernel_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	int nid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	show_mem_layout();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	nodes_clear(node_online_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	min_low_pfn = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	max_low_pfn = 0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	for (nid = 0; nid < MAX_NUMNODES; nid++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		setup_memory_node(nid, kernel_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	kernel_size = virt_to_phys(kernel_end) - KERNEL_START_PHYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	memblock_reserve(KERNEL_START_PHYS, kernel_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) #ifdef CONFIG_BLK_DEV_INITRD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	initrd_start = INITRD_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	if (initrd_start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		extern void *move_initrd(unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		initrd_end = initrd_start+INITRD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		       (void *) initrd_start, INITRD_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			if (!move_initrd(PFN_PHYS(max_low_pfn)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 				printk("initrd extends beyond end of memory "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 				       "(0x%08lx > 0x%p)\ndisabling initrd\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 				       initrd_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 				       phys_to_virt(PFN_PHYS(max_low_pfn)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			nid = kvaddr_to_nid(initrd_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 			memblock_reserve(virt_to_phys((void *)initrd_start),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 					 INITRD_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) #endif /* CONFIG_BLK_DEV_INITRD */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) void __init paging_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	unsigned long   max_zone_pfn[MAX_NR_ZONES] = {0, };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	unsigned long	dma_local_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	 * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	 * in the NUMA model, for now we convert it to a pfn and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	 * we interpret this pfn as a local per-node information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	 * This issue isn't very important since none of these machines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	 * have legacy ISA slots anyways.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	max_zone_pfn[ZONE_DMA] = dma_local_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	max_zone_pfn[ZONE_NORMAL] = max_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	free_area_init(max_zone_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	/* Initialize the kernel's ZERO_PGE. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	memset((void *)ZERO_PGE, 0, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }