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