arch/m32r/mm/discontig.c

   1 /*
   2  *  linux/arch/m32r/mm/discontig.c
   3  *
   4  *  Discontig memory support
   5  *
   6  *  Copyright (c) 2003  Hitoshi Yamamoto
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/mm.h>
  11 #include <linux/bootmem.h>
  12 #include <linux/mmzone.h>
  13 #include <linux/initrd.h>
  14 #include <linux/nodemask.h>
  15 #include <linux/module.h>
  16 #include <linux/pfn.h>
  17
  18 #include <asm/setup.h>
  19
  20 extern char _end[];
  21
  22 struct pglist_data *node_data[MAX_NUMNODES];
  23 EXPORT_SYMBOL(node_data);
  24 static bootmem_data_t node_bdata[MAX_NUMNODES] __initdata;
  25
  26 pg_data_t m32r_node_data[MAX_NUMNODES];
  27
  28 /* Memory profile */
  29 typedef struct {
  30         unsigned long start_pfn;
  31         unsigned long pages;
  32         unsigned long holes;
  33         unsigned long free_pfn;
  34 } mem_prof_t;
  35 static mem_prof_t mem_prof[MAX_NUMNODES];
  36
  37 static void __init mem_prof_init(void)
  38 {
  39         unsigned long start_pfn, holes, free_pfn;
  40         const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
  41         unsigned long ul;
  42         mem_prof_t *mp;
  43
  44         /* Node#0 SDRAM */
  45         mp = &mem_prof[0];
  46         mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
  47         mp->pages = PFN_DOWN(CONFIG_MEMORY_SIZE);
  48         mp->holes = 0;
  49         mp->free_pfn = PFN_UP(__pa(_end));
  50
  51         /* Node#1 internal SRAM */
  52         mp = &mem_prof[1];
  53         start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
  54         holes = 0;
  55         if (start_pfn & (zone_alignment - 1)) {
  56                 ul = zone_alignment;
  57                 while (start_pfn >= ul)
  58                         ul += zone_alignment;
  59
  60                 start_pfn = ul - zone_alignment;
  61                 holes = free_pfn - start_pfn;
  62         }
  63
  64         mp->start_pfn = start_pfn;
  65         mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
  66         mp->holes = holes;
  67         mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
  68 }
  69
  70 unsigned long __init setup_memory(void)
  71 {
  72         unsigned long bootmap_size;
  73         unsigned long min_pfn;
  74         int nid;
  75         mem_prof_t *mp;
  76
  77         max_low_pfn = 0;
  78         min_low_pfn = -1;
  79
  80         mem_prof_init();
  81
  82         for_each_online_node(nid) {
  83                 mp = &mem_prof[nid];
  84                 NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
  85                 NODE_DATA(nid)->bdata = &node_bdata[nid];
  86                 min_pfn = mp->start_pfn;
  87                 max_pfn = mp->start_pfn + mp->pages;
  88                 bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
  89                         mp->start_pfn, max_pfn);
  90
  91                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
  92                         PFN_PHYS(mp->pages));
  93
  94                 reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
  95                         PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size);
  96
  97                 if (max_low_pfn < max_pfn)
  98                         max_low_pfn = max_pfn;
  99
 100                 if (min_low_pfn > min_pfn)
 101                         min_low_pfn = min_pfn;
 102         }
 103
 104 #ifdef CONFIG_BLK_DEV_INITRD
 105         if (LOADER_TYPE && INITRD_START) {
 106                 if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
 107                         reserve_bootmem_node(NODE_DATA(0), INITRD_START,
 108                                 INITRD_SIZE);
 109                         initrd_start = INITRD_START ?
 110                                 INITRD_START + PAGE_OFFSET : 0;
 111
 112                         initrd_end = initrd_start + INITRD_SIZE;
 113                         printk("initrd:start[%08lx],size[%08lx]\n",
 114                                 initrd_start, INITRD_SIZE);
 115                 } else {
 116                         printk("initrd extends beyond end of memory "
 117                                 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 118                                 INITRD_START + INITRD_SIZE,
 119                                 PFN_PHYS(max_low_pfn));
 120
 121                         initrd_start = 0;
 122                 }
 123         }
 124 #endif  /* CONFIG_BLK_DEV_INITRD */
 125
 126         return max_low_pfn;
 127 }
 128
 129 #define START_PFN(nid)  \
 130         (NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
 131 #define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
 132
 133 unsigned long __init zone_sizes_init(void)
 134 {
 135         unsigned long zones_size[MAX_NR_ZONES], zholes_size[MAX_NR_ZONES];
 136         unsigned long low, start_pfn;
 137         unsigned long holes = 0;
 138         int nid, i;
 139         mem_prof_t *mp;
 140
 141         for_each_online_node(nid) {
 142                 mp = &mem_prof[nid];
 143                 for (i = 0 ; i < MAX_NR_ZONES ; i++) {
 144                         zones_size[i] = 0;
 145                         zholes_size[i] = 0;
 146                 }
 147                 start_pfn = START_PFN(nid);
 148                 low = MAX_LOW_PFN(nid);
 149                 zones_size[ZONE_DMA] = low - start_pfn;
 150                 zholes_size[ZONE_DMA] = mp->holes;
 151                 holes += zholes_size[ZONE_DMA];
 152
 153                 free_area_init_node(nid, NODE_DATA(nid), zones_size,
 154                         start_pfn, zholes_size);
 155         }
 156
 157         /*
 158          * For test
 159          *  Use all area of internal RAM.
 160          *  see __alloc_pages()
 161          */
 162         NODE_DATA(1)->node_zones->pages_min = 0;
 163         NODE_DATA(1)->node_zones->pages_low = 0;
 164         NODE_DATA(1)->node_zones->pages_high = 0;
 165
 166         return holes;
 167 }
 168