release/src-rt-6.x.4708/linux/linux-2.6.36/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/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 extern unsigned long memory_start;
  36 extern unsigned long memory_end;
  37
  38 static void __init mem_prof_init(void)
  39 {
  40         unsigned long start_pfn, holes, free_pfn;
  41         const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
  42         unsigned long ul;
  43         mem_prof_t *mp;
  44
  45         /* Node#0 SDRAM */
  46         mp = &mem_prof[0];
  47         mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
  48         mp->pages = PFN_DOWN(memory_end - memory_start);
  49         mp->holes = 0;
  50         mp->free_pfn = PFN_UP(__pa(_end));
  51
  52         /* Node#1 internal SRAM */
  53         mp = &mem_prof[1];
  54         start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
  55         holes = 0;
  56         if (start_pfn & (zone_alignment - 1)) {
  57                 ul = zone_alignment;
  58                 while (start_pfn >= ul)
  59                         ul += zone_alignment;
  60
  61                 start_pfn = ul - zone_alignment;
  62                 holes = free_pfn - start_pfn;
  63         }
  64
  65         mp->start_pfn = start_pfn;
  66         mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
  67         mp->holes = holes;
  68         mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
  69 }
  70
  71 unsigned long __init setup_memory(void)
  72 {
  73         unsigned long bootmap_size;
  74         unsigned long min_pfn;
  75         int nid;
  76         mem_prof_t *mp;
  77
  78         max_low_pfn = 0;
  79         min_low_pfn = -1;
  80
  81         mem_prof_init();
  82
  83         for_each_online_node(nid) {
  84                 mp = &mem_prof[nid];
  85                 NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
  86                 NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
  87                 min_pfn = mp->start_pfn;
  88                 max_pfn = mp->start_pfn + mp->pages;
  89                 bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
  90                         mp->start_pfn, max_pfn);
  91
  92                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
  93                         PFN_PHYS(mp->pages));
  94
  95                 reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
  96                         PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size,
  97                         BOOTMEM_DEFAULT);
  98
  99                 if (max_low_pfn < max_pfn)
 100                         max_low_pfn = max_pfn;
 101
 102                 if (min_low_pfn > min_pfn)
 103                         min_low_pfn = min_pfn;
 104         }
 105
 106 #ifdef CONFIG_BLK_DEV_INITRD
 107         if (LOADER_TYPE && INITRD_START) {
 108                 if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
 109                         reserve_bootmem_node(NODE_DATA(0), INITRD_START,
 110                                 INITRD_SIZE, BOOTMEM_DEFAULT);
 111                         initrd_start = INITRD_START + PAGE_OFFSET;
 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%08llx)\ndisabling initrd\n",
 118                                 INITRD_START + INITRD_SIZE,
 119                                 (unsigned long long)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)          (NODE_DATA(nid)->bdata->node_min_pfn)
 130 #define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
 131
 132 unsigned long __init zone_sizes_init(void)
 133 {
 134         unsigned long zones_size[MAX_NR_ZONES], zholes_size[MAX_NR_ZONES];
 135         unsigned long low, start_pfn;
 136         unsigned long holes = 0;
 137         int nid, i;
 138         mem_prof_t *mp;
 139
 140         for_each_online_node(nid) {
 141                 mp = &mem_prof[nid];
 142                 for (i = 0 ; i < MAX_NR_ZONES ; i++) {
 143                         zones_size[i] = 0;
 144                         zholes_size[i] = 0;
 145                 }
 146                 start_pfn = START_PFN(nid);
 147                 low = MAX_LOW_PFN(nid);
 148                 zones_size[ZONE_DMA] = low - start_pfn;
 149                 zholes_size[ZONE_DMA] = mp->holes;
 150                 holes += zholes_size[ZONE_DMA];
 151
 152                 free_area_init_node(nid, zones_size, start_pfn, zholes_size);
 153         }
 154
 155         /*
 156          * For test
 157          *  Use all area of internal RAM.
 158          *  see __alloc_pages()
 159          */
 160         NODE_DATA(1)->node_zones->watermark[WMARK_MIN] = 0;
 161         NODE_DATA(1)->node_zones->watermark[WMARK_LOW] = 0;
 162         NODE_DATA(1)->node_zones->watermark[WMARK_HIGH] = 0;
 163
 164         return holes;
 165 }