arch/m32r/mm/init.c

   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 /* $Id$ */
  13
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/mm.h>
  17 #include <linux/pagemap.h>
  18 #include <linux/bootmem.h>
  19 #include <linux/swap.h>
  20 #include <linux/highmem.h>
  21 #include <asm/types.h>
  22 #include <asm/processor.h>
  23 #include <asm/bitops.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_pgdat(pgdat) {
  52                 for (i = 0; i < pgdat->node_spanned_pages; ++i) {
  53                         page = pgdat->node_mem_map + i;
  54                         total++;
  55                         if (PageHighMem(page))
  56                                 highmem++;
  57                         if (PageReserved(page))
  58                                 reserved++;
  59                         else if (PageSwapCache(page))
  60                                 cached++;
  61                         else if (page_count(page))
  62                                 shared += page_count(page) - 1;
  63                 }
  64         }
  65         printk("%d pages of RAM\n", total);
  66         printk("%d pages of HIGHMEM\n",highmem);
  67         printk("%d reserved pages\n",reserved);
  68         printk("%d pages shared\n",shared);
  69         printk("%d pages swap cached\n",cached);
  70 }
  71
  72 /*
  73  * Cache of MMU context last used.
  74  */
  75 #ifndef CONFIG_SMP
  76 unsigned long mmu_context_cache_dat;
  77 #else
  78 unsigned long mmu_context_cache_dat[NR_CPUS];
  79 #endif
  80 static unsigned long hole_pages;
  81
  82 /*
  83  * function prototype
  84  */
  85 void __init paging_init(void);
  86 void __init mem_init(void);
  87 void free_initmem(void);
  88 #ifdef CONFIG_BLK_DEV_INITRD
  89 void free_initrd_mem(unsigned long, unsigned long);
  90 #endif
  91
  92 /* It'd be good if these lines were in the standard header file. */
  93 #define START_PFN(nid)  \
  94         (NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
  95 #define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
  96
  97 #ifndef CONFIG_DISCONTIGMEM
  98 unsigned long __init zone_sizes_init(void)
  99 {
 100         unsigned long  zones_size[MAX_NR_ZONES] = {0, 0, 0};
 101         unsigned long  max_dma;
 102         unsigned long  low;
 103         unsigned long  start_pfn;
 104
 105 #ifdef CONFIG_MMU
 106         start_pfn = START_PFN(0);
 107         max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 108         low = MAX_LOW_PFN(0);
 109
 110         if (low < max_dma){
 111                 zones_size[ZONE_DMA] = low - start_pfn;
 112                 zones_size[ZONE_NORMAL] = 0;
 113         } else {
 114                 zones_size[ZONE_DMA] = low - start_pfn;
 115                 zones_size[ZONE_NORMAL] = low - max_dma;
 116         }
 117 #else
 118         zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
 119         zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
 120         start_pfn = __MEMORY_START >> PAGE_SHIFT;
 121 #endif /* CONFIG_MMU */
 122
 123         free_area_init_node(0, NODE_DATA(0), zones_size, start_pfn, 0);
 124
 125         mem_map = contig_page_data.node_mem_map;
 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 (nid = 0 ; nid < numnodes ; nid++)
 157                 for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
 158                         if (PageReserved(NODE_DATA(nid)->node_mem_map + i))
 159                                 reservedpages++;
 160
 161         return reservedpages;
 162 }
 163
 164 /*======================================================================*
 165  * mem_init() :
 166  * orig : arch/sh/mm/init.c
 167  *======================================================================*/
 168 void __init mem_init(void)
 169 {
 170         int codesize, reservedpages, datasize, initsize;
 171         int nid;
 172 #ifndef CONFIG_MMU
 173         extern unsigned long memory_end;
 174 #endif
 175
 176         num_physpages = 0;
 177         for (nid = 0 ; nid < numnodes ; nid++)
 178                 num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
 179
 180         num_physpages -= hole_pages;
 181
 182 #ifndef CONFIG_DISCONTIGMEM
 183         max_mapnr = num_physpages;
 184 #endif  /* CONFIG_DISCONTIGMEM */
 185
 186 #ifdef CONFIG_MMU
 187         high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
 188 #else
 189         high_memory = (void *)(memory_end & PAGE_MASK);
 190 #endif /* CONFIG_MMU */
 191
 192         /* clear the zero-page */
 193         memset(empty_zero_page, 0, PAGE_SIZE);
 194
 195         /* this will put all low memory onto the freelists */
 196         for (nid = 0 ; nid < numnodes ; nid++)
 197                 totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
 198
 199         reservedpages = reservedpages_count() - hole_pages;
 200         codesize = (unsigned long) &_etext - (unsigned long)&_text;
 201         datasize = (unsigned long) &_edata - (unsigned long)&_etext;
 202         initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
 203
 204         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 205                 "%dk reserved, %dk data, %dk init)\n",
 206                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
 207                 num_physpages << (PAGE_SHIFT-10),
 208                 codesize >> 10,
 209                 reservedpages << (PAGE_SHIFT-10),
 210                 datasize >> 10,
 211                 initsize >> 10);
 212 }
 213
 214 /*======================================================================*
 215  * free_initmem() :
 216  * orig : arch/sh/mm/init.c
 217  *======================================================================*/
 218 void free_initmem(void)
 219 {
 220         unsigned long addr;
 221
 222         addr = (unsigned long)(&__init_begin);
 223         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 224                 ClearPageReserved(virt_to_page(addr));
 225                 set_page_count(virt_to_page(addr), 1);
 226                 free_page(addr);
 227                 totalram_pages++;
 228         }
 229         printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
 230           (int)(&__init_end - &__init_begin) >> 10);
 231 }
 232
 233 #ifdef CONFIG_BLK_DEV_INITRD
 234 /*======================================================================*
 235  * free_initrd_mem() :
 236  * orig : arch/sh/mm/init.c
 237  *======================================================================*/
 238 void free_initrd_mem(unsigned long start, unsigned long end)
 239 {
 240         unsigned long p;
 241         for (p = start; p < end; p += PAGE_SIZE) {
 242                 ClearPageReserved(virt_to_page(p));
 243                 set_page_count(virt_to_page(p), 1);
 244                 free_page(p);
 245                 totalram_pages++;
 246         }
 247         printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 248 }
 249 #endif
 250