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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/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
  16 #include <asm/setup.h>
  17
  18 extern char _end[];
  19
  20 struct pglist_data *node_data[MAX_NUMNODES];
  21 static bootmem_data_t node_bdata[MAX_NUMNODES] __initdata;
  22
  23 pg_data_t m32r_node_data[MAX_NUMNODES];
  24
  25 /* Memory profile */
  26 typedef struct {
  27         unsigned long start_pfn;
  28         unsigned long pages;
  29         unsigned long holes;
  30         unsigned long free_pfn;
  31 } mem_prof_t;
  32 static mem_prof_t mem_prof[MAX_NUMNODES];
  33
  34 static void __init mem_prof_init(void)
  35 {
  36         unsigned long start_pfn, holes, free_pfn;
  37         const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
  38         unsigned long ul;
  39         mem_prof_t *mp;
  40
  41         /* Node#0 SDRAM */
  42         mp = &mem_prof[0];
  43         mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
  44         mp->pages = PFN_DOWN(CONFIG_MEMORY_SIZE);
  45         mp->holes = 0;
  46         mp->free_pfn = PFN_UP(__pa(_end));
  47
  48         /* Node#1 internal SRAM */
  49         mp = &mem_prof[1];
  50         start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
  51         holes = 0;
  52         if (start_pfn & (zone_alignment - 1)) {
  53                 ul = zone_alignment;
  54                 while (start_pfn >= ul)
  55                         ul += zone_alignment;
  56
  57                 start_pfn = ul - zone_alignment;
  58                 holes = free_pfn - start_pfn;
  59         }
  60
  61         mp->start_pfn = start_pfn;
  62         mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
  63         mp->holes = holes;
  64         mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
  65 }
  66
  67 unsigned long __init setup_memory(void)
  68 {
  69         unsigned long bootmap_size;
  70         unsigned long min_pfn;
  71         int nid;
  72         mem_prof_t *mp;
  73
  74         max_low_pfn = 0;
  75         min_low_pfn = -1;
  76
  77         mem_prof_init();
  78
  79         for_each_online_node(nid) {
  80                 mp = &mem_prof[nid];
  81                 NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
  82                 NODE_DATA(nid)->bdata = &node_bdata[nid];
  83                 min_pfn = mp->start_pfn;
  84                 max_pfn = mp->start_pfn + mp->pages;
  85                 bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
  86                         mp->start_pfn, max_pfn);
  87
  88                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
  89                         PFN_PHYS(mp->pages));
  90
  91                 reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
  92                         PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size);
  93
  94                 if (max_low_pfn < max_pfn)
  95                         max_low_pfn = max_pfn;
  96
  97                 if (min_low_pfn > min_pfn)
  98                         min_low_pfn = min_pfn;
  99         }
 100
 101 #ifdef CONFIG_BLK_DEV_INITRD
 102         if (LOADER_TYPE && INITRD_START) {
 103                 if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
 104                         reserve_bootmem_node(NODE_DATA(0), INITRD_START,
 105                                 INITRD_SIZE);
 106                         initrd_start = INITRD_START ?
 107                                 INITRD_START + PAGE_OFFSET : 0;
 108
 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%08lx)\ndisabling initrd\n",
 115                                 INITRD_START + INITRD_SIZE,
 116                                 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)  \
 127         (NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
 128 #define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
 129
 130 unsigned long __init zone_sizes_init(void)
 131 {
 132         unsigned long zones_size[MAX_NR_ZONES], zholes_size[MAX_NR_ZONES];
 133         unsigned long low, start_pfn;
 134         unsigned long holes = 0;
 135         int nid, i;
 136         mem_prof_t *mp;
 137
 138         pgdat_list = NULL;
 139         for (nid = num_online_nodes() - 1 ; nid >= 0 ; nid--) {
 140                 NODE_DATA(nid)->pgdat_next = pgdat_list;
 141                 pgdat_list = NODE_DATA(nid);
 142         }
 143
 144         for_each_online_node(nid) {
 145                 mp = &mem_prof[nid];
 146                 for (i = 0 ; i < MAX_NR_ZONES ; i++) {
 147                         zones_size[i] = 0;
 148                         zholes_size[i] = 0;
 149                 }
 150                 start_pfn = START_PFN(nid);
 151                 low = MAX_LOW_PFN(nid);
 152                 zones_size[ZONE_DMA] = low - start_pfn;
 153                 zholes_size[ZONE_DMA] = mp->holes;
 154                 holes += zholes_size[ZONE_DMA];
 155
 156                 free_area_init_node(nid, NODE_DATA(nid), zones_size,
 157                         start_pfn, zholes_size);
 158         }
 159
 160         /*
 161          * For test
 162          *  Use all area of internal RAM.
 163          *  see __alloc_pages()
 164          */
 165         NODE_DATA(1)->node_zones->pages_min = 0;
 166         NODE_DATA(1)->node_zones->pages_low = 0;
 167         NODE_DATA(1)->node_zones->pages_high = 0;
 168
 169         return holes;
 170 }
 171