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