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   1 /*
   2  *  linux/arch/m32r/mm/init.c
   3  *
   4  *  Copyright (c) 2001, 2002  Hitoshi Yamamoto
   5  *
   6  *  Some code taken from sh version.
   7  *    Copyright (C) 1999  Niibe Yutaka
   8  *    Based on linux/arch/i386/mm/init.c:
   9  *      Copyright (C) 1995  Linus Torvalds
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mm.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/swap.h>
  18 #include <linux/highmem.h>
  19 #include <linux/bitops.h>
  20 #include <linux/nodemask.h>
  21 #include <linux/pfn.h>
  22 #include <asm/types.h>
  23 #include <asm/processor.h>
  24 #include <asm/page.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/pgalloc.h>
  27 #include <asm/mmu_context.h>
  28 #include <asm/setup.h>
  29 #include <asm/tlb.h>
  30
  31 /* References to section boundaries */
  32 extern char _text, _etext, _edata;
  33 extern char __init_begin, __init_end;
  34
  35 pgd_t swapper_pg_dir[1024];
  36
  37 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  38
  39 void show_mem(void)
  40 {
  41         int total = 0, reserved = 0;
  42         int shared = 0, cached = 0;
  43         int highmem = 0;
  44         struct page *page;
  45         pg_data_t *pgdat;
  46         unsigned long i;
  47
  48         printk("Mem-info:\n");
  49         show_free_areas();
  50         printk("Free swap:       %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
  51         for_each_online_pgdat(pgdat) {
  52                 unsigned long flags;
  53                 pgdat_resize_lock(pgdat, &flags);
  54                 for (i = 0; i < pgdat->node_spanned_pages; ++i) {
  55                         page = pgdat_page_nr(pgdat, i);
  56                         total++;
  57                         if (PageHighMem(page))
  58                                 highmem++;
  59                         if (PageReserved(page))
  60                                 reserved++;
  61                         else if (PageSwapCache(page))
  62                                 cached++;
  63                         else if (page_count(page))
  64                                 shared += page_count(page) - 1;
  65                 }
  66                 pgdat_resize_unlock(pgdat, &flags);
  67         }
  68         printk("%d pages of RAM\n", total);
  69         printk("%d pages of HIGHMEM\n",highmem);
  70         printk("%d reserved pages\n",reserved);
  71         printk("%d pages shared\n",shared);
  72         printk("%d pages swap cached\n",cached);
  73 }
  74
  75 /*
  76  * Cache of MMU context last used.
  77  */
  78 #ifndef CONFIG_SMP
  79 unsigned long mmu_context_cache_dat;
  80 #else
  81 unsigned long mmu_context_cache_dat[NR_CPUS];
  82 #endif
  83 static unsigned long hole_pages;
  84
  85 /*
  86  * function prototype
  87  */
  88 void __init paging_init(void);
  89 void __init mem_init(void);
  90 void free_initmem(void);
  91 #ifdef CONFIG_BLK_DEV_INITRD
  92 void free_initrd_mem(unsigned long, unsigned long);
  93 #endif
  94
  95 /* It'd be good if these lines were in the standard header file. */
  96 #define START_PFN(nid)          (NODE_DATA(nid)->bdata->node_min_pfn)
  97 #define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
  98
  99 #ifndef CONFIG_DISCONTIGMEM
 100 unsigned long __init zone_sizes_init(void)
 101 {
 102         unsigned long  zones_size[MAX_NR_ZONES] = {0, };
 103         unsigned long  max_dma;
 104         unsigned long  low;
 105         unsigned long  start_pfn;
 106
 107 #ifdef CONFIG_MMU
 108         start_pfn = START_PFN(0);
 109         max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 110         low = MAX_LOW_PFN(0);
 111
 112         if (low < max_dma){
 113                 zones_size[ZONE_DMA] = low - start_pfn;
 114                 zones_size[ZONE_NORMAL] = 0;
 115         } else {
 116                 zones_size[ZONE_DMA] = low - start_pfn;
 117                 zones_size[ZONE_NORMAL] = low - max_dma;
 118         }
 119 #else
 120         zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
 121         zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
 122         start_pfn = __MEMORY_START >> PAGE_SHIFT;
 123 #endif /* CONFIG_MMU */
 124
 125         free_area_init_node(0, zones_size, start_pfn, 0);
 126
 127         return 0;
 128 }
 129 #else   /* CONFIG_DISCONTIGMEM */
 130 extern unsigned long zone_sizes_init(void);
 131 #endif  /* CONFIG_DISCONTIGMEM */
 132
 133 /*======================================================================*
 134  * paging_init() : sets up the page tables
 135  *======================================================================*/
 136 void __init paging_init(void)
 137 {
 138 #ifdef CONFIG_MMU
 139         int  i;
 140         pgd_t *pg_dir;
 141
 142         /* We don't need kernel mapping as hardware support that. */
 143         pg_dir = swapper_pg_dir;
 144
 145         for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
 146                 pgd_val(pg_dir[i]) = 0;
 147 #endif /* CONFIG_MMU */
 148         hole_pages = zone_sizes_init();
 149 }
 150
 151 int __init reservedpages_count(void)
 152 {
 153         int reservedpages, nid, i;
 154
 155         reservedpages = 0;
 156         for_each_online_node(nid) {
 157                 unsigned long flags;
 158                 pgdat_resize_lock(NODE_DATA(nid), &flags);
 159                 for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
 160                         if (PageReserved(nid_page_nr(nid, i)))
 161                                 reservedpages++;
 162                 pgdat_resize_unlock(NODE_DATA(nid), &flags);
 163         }
 164
 165         return reservedpages;
 166 }
 167
 168 /*======================================================================*
 169  * mem_init() :
 170  * orig : arch/sh/mm/init.c
 171  *======================================================================*/
 172 void __init mem_init(void)
 173 {
 174         int codesize, reservedpages, datasize, initsize;
 175         int nid;
 176 #ifndef CONFIG_MMU
 177         extern unsigned long memory_end;
 178 #endif
 179
 180         num_physpages = 0;
 181         for_each_online_node(nid)
 182                 num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
 183
 184         num_physpages -= hole_pages;
 185
 186 #ifndef CONFIG_DISCONTIGMEM
 187         max_mapnr = num_physpages;
 188 #endif  /* CONFIG_DISCONTIGMEM */
 189
 190 #ifdef CONFIG_MMU
 191         high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
 192 #else
 193         high_memory = (void *)(memory_end & PAGE_MASK);
 194 #endif /* CONFIG_MMU */
 195
 196         /* clear the zero-page */
 197         memset(empty_zero_page, 0, PAGE_SIZE);
 198
 199         /* this will put all low memory onto the freelists */
 200         for_each_online_node(nid)
 201                 totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
 202
 203         reservedpages = reservedpages_count() - hole_pages;
 204         codesize = (unsigned long) &_etext - (unsigned long)&_text;
 205         datasize = (unsigned long) &_edata - (unsigned long)&_etext;
 206         initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
 207
 208         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 209                 "%dk reserved, %dk data, %dk init)\n",
 210                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
 211                 num_physpages << (PAGE_SHIFT-10),
 212                 codesize >> 10,
 213                 reservedpages << (PAGE_SHIFT-10),
 214                 datasize >> 10,
 215                 initsize >> 10);
 216 }
 217
 218 /*======================================================================*
 219  * free_initmem() :
 220  * orig : arch/sh/mm/init.c
 221  *======================================================================*/
 222 void free_initmem(void)
 223 {
 224         unsigned long addr;
 225
 226         addr = (unsigned long)(&__init_begin);
 227         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 228                 ClearPageReserved(virt_to_page(addr));
 229                 init_page_count(virt_to_page(addr));
 230                 free_page(addr);
 231                 totalram_pages++;
 232         }
 233         printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
 234           (int)(&__init_end - &__init_begin) >> 10);
 235 }
 236
 237 #ifdef CONFIG_BLK_DEV_INITRD
 238 /*======================================================================*
 239  * free_initrd_mem() :
 240  * orig : arch/sh/mm/init.c
 241  *======================================================================*/
 242 void free_initrd_mem(unsigned long start, unsigned long end)
 243 {
 244         unsigned long p;
 245         for (p = start; p < end; p += PAGE_SIZE) {
 246                 ClearPageReserved(virt_to_page(p));
 247                 init_page_count(virt_to_page(p));
 248                 free_page(p);
 249                 totalram_pages++;
 250         }
 251         printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 252 }
 253 #endif