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
  15 #include <asm/setup.h>
  16
  17 extern char _end[];
  18
  19 struct pglist_data *node_data[MAX_NUMNODES];
  20 static bootmem_data_t node_bdata[MAX_NUMNODES] __initdata;
  21
  22 pg_data_t m32r_node_data[MAX_NUMNODES];
  23
  24 /* Memory profile */
  25 typedef struct {
  26         unsigned long start_pfn;
  27         unsigned long pages;
  28         unsigned long holes;
  29         unsigned long free_pfn;
  30 } mem_prof_t;
  31 static mem_prof_t mem_prof[MAX_NUMNODES];
  32
  33 static void __init mem_prof_init(void)
  34 {
  35         unsigned long start_pfn, holes, free_pfn;
  36         const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
  37         unsigned long ul;
  38         mem_prof_t *mp;
  39
  40         /* Node#0 SDRAM */
  41         mp = &mem_prof[0];
  42         mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
  43         mp->pages = PFN_DOWN(CONFIG_MEMORY_SIZE);
  44         mp->holes = 0;
  45         mp->free_pfn = PFN_UP(__pa(_end));
  46
  47         /* Node#1 internal SRAM */
  48         mp = &mem_prof[1];
  49         start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
  50         holes = 0;
  51         if (start_pfn & (zone_alignment - 1)) {
  52                 ul = zone_alignment;
  53                 while (start_pfn >= ul)
  54                         ul += zone_alignment;
  55
  56                 start_pfn = ul - zone_alignment;
  57                 holes = free_pfn - start_pfn;
  58         }
  59
  60         mp->start_pfn = start_pfn;
  61         mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
  62         mp->holes = holes;
  63         mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
  64 }
  65
  66 unsigned long __init setup_memory(void)
  67 {
  68         unsigned long bootmap_size;
  69         unsigned long min_pfn;
  70         int nid;
  71         mem_prof_t *mp;
  72
  73         max_low_pfn = 0;
  74         min_low_pfn = -1;
  75
  76         mem_prof_init();
  77
  78         for (nid = 0 ; nid < numnodes ; nid++) {
  79                 mp = &mem_prof[nid];
  80                 NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
  81                 NODE_DATA(nid)->bdata = &node_bdata[nid];
  82                 min_pfn = mp->start_pfn;
  83                 max_pfn = mp->start_pfn + mp->pages;
  84                 bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
  85                         mp->start_pfn, max_pfn);
  86
  87                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
  88                         PFN_PHYS(mp->pages));
  89
  90                 reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
  91                         PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size);
  92
  93                 if (max_low_pfn < max_pfn)
  94                         max_low_pfn = max_pfn;
  95
  96                 if (min_low_pfn > min_pfn)
  97                         min_low_pfn = min_pfn;
  98         }
  99
 100 #ifdef CONFIG_BLK_DEV_INITRD
 101         if (LOADER_TYPE && INITRD_START) {
 102                 if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
 103                         reserve_bootmem_node(NODE_DATA(0), INITRD_START,
 104                                 INITRD_SIZE);
 105                         initrd_start = INITRD_START ?
 106                                 INITRD_START + PAGE_OFFSET : 0;
 107
 108                         initrd_end = initrd_start + INITRD_SIZE;
 109                         printk("initrd:start[%08lx],size[%08lx]\n",
 110                                 initrd_start, INITRD_SIZE);
 111                 } else {
 112                         printk("initrd extends beyond end of memory "
 113                                 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 114                                 INITRD_START + INITRD_SIZE,
 115                                 PFN_PHYS(max_low_pfn));
 116
 117                         initrd_start = 0;
 118                 }
 119         }
 120 #endif  /* CONFIG_BLK_DEV_INITRD */
 121
 122         return max_low_pfn;
 123 }
 124
 125 #define START_PFN(nid)  \
 126         (NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
 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         pgdat_list = NULL;
 138         for (nid = numnodes - 1 ; nid >= 0 ; nid--) {
 139                 NODE_DATA(nid)->pgdat_next = pgdat_list;
 140                 pgdat_list = NODE_DATA(nid);
 141         }
 142
 143         for (nid = 0 ; nid < numnodes ; nid++) {
 144                 mp = &mem_prof[nid];
 145                 for (i = 0 ; i < MAX_NR_ZONES ; i++) {
 146                         zones_size[i] = 0;
 147                         zholes_size[i] = 0;
 148                 }
 149                 start_pfn = START_PFN(nid);
 150                 low = MAX_LOW_PFN(nid);
 151                 zones_size[ZONE_DMA] = low - start_pfn;
 152                 zholes_size[ZONE_DMA] = mp->holes;
 153                 holes += zholes_size[ZONE_DMA];
 154
 155                 free_area_init_node(nid, NODE_DATA(nid), zones_size,
 156                         start_pfn, zholes_size);
 157         }
 158
 159         /*
 160          * For test
 161          *  Use all area of internal RAM.
 162          *  see __alloc_pages()
 163          */
 164         NODE_DATA(1)->node_zones->pages_min = 0;
 165         NODE_DATA(1)->node_zones->pages_low = 0;
 166         NODE_DATA(1)->node_zones->pages_high = 0;
 167
 168         return holes;
 169 }
 170