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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 static bootmem_data_t node_bdata[MAX_NUMNODES] __initdata;
  24
  25 pg_data_t m32r_node_data[MAX_NUMNODES];
  26
  27 /* Memory profile */
  28 typedef struct {
  29         unsigned long start_pfn;
  30         unsigned long pages;
  31         unsigned long holes;
  32         unsigned long free_pfn;
  33 } mem_prof_t;
  34 static mem_prof_t mem_prof[MAX_NUMNODES];
  35
  36 static void __init mem_prof_init(void)
  37 {
  38         unsigned long start_pfn, holes, free_pfn;
  39         const unsigned long zone_alignment = 1UL << (MAX_ORDER - 1);
  40         unsigned long ul;
  41         mem_prof_t *mp;
  42
  43         /* Node#0 SDRAM */
  44         mp = &mem_prof[0];
  45         mp->start_pfn = PFN_UP(CONFIG_MEMORY_START);
  46         mp->pages = PFN_DOWN(CONFIG_MEMORY_SIZE);
  47         mp->holes = 0;
  48         mp->free_pfn = PFN_UP(__pa(_end));
  49
  50         /* Node#1 internal SRAM */
  51         mp = &mem_prof[1];
  52         start_pfn = free_pfn = PFN_UP(CONFIG_IRAM_START);
  53         holes = 0;
  54         if (start_pfn & (zone_alignment - 1)) {
  55                 ul = zone_alignment;
  56                 while (start_pfn >= ul)
  57                         ul += zone_alignment;
  58
  59                 start_pfn = ul - zone_alignment;
  60                 holes = free_pfn - start_pfn;
  61         }
  62
  63         mp->start_pfn = start_pfn;
  64         mp->pages = PFN_DOWN(CONFIG_IRAM_SIZE) + holes;
  65         mp->holes = holes;
  66         mp->free_pfn = PFN_UP(CONFIG_IRAM_START);
  67 }
  68
  69 unsigned long __init setup_memory(void)
  70 {
  71         unsigned long bootmap_size;
  72         unsigned long min_pfn;
  73         int nid;
  74         mem_prof_t *mp;
  75
  76         max_low_pfn = 0;
  77         min_low_pfn = -1;
  78
  79         mem_prof_init();
  80
  81         for_each_online_node(nid) {
  82                 mp = &mem_prof[nid];
  83                 NODE_DATA(nid)=(pg_data_t *)&m32r_node_data[nid];
  84                 NODE_DATA(nid)->bdata = &node_bdata[nid];
  85                 min_pfn = mp->start_pfn;
  86                 max_pfn = mp->start_pfn + mp->pages;
  87                 bootmap_size = init_bootmem_node(NODE_DATA(nid), mp->free_pfn,
  88                         mp->start_pfn, max_pfn);
  89
  90                 free_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
  91                         PFN_PHYS(mp->pages));
  92
  93                 reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
  94                         PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size);
  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);
 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%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         for_each_online_node(nid) {
 139                 mp = &mem_prof[nid];
 140                 for (i = 0 ; i < MAX_NR_ZONES ; i++) {
 141                         zones_size[i] = 0;
 142                         zholes_size[i] = 0;
 143                 }
 144                 start_pfn = START_PFN(nid);
 145                 low = MAX_LOW_PFN(nid);
 146                 zones_size[ZONE_DMA] = low - start_pfn;
 147                 zholes_size[ZONE_DMA] = mp->holes;
 148                 holes += zholes_size[ZONE_DMA];
 149
 150                 free_area_init_node(nid, NODE_DATA(nid), zones_size,
 151                         start_pfn, zholes_size);
 152         }
 153
 154         /*
 155          * For test
 156          *  Use all area of internal RAM.
 157          *  see __alloc_pages()
 158          */
 159         NODE_DATA(1)->node_zones->pages_min = 0;
 160         NODE_DATA(1)->node_zones->pages_low = 0;
 161         NODE_DATA(1)->node_zones->pages_high = 0;
 162
 163         return holes;
 164 }
 165