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