LXR linux/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 */
  33extern char _text, _etext, _edata;
  34extern char __init_begin, __init_end;
  35
  36pgd_t swapper_pg_dir[1024];
  37
  38/*
  39 * Cache of MMU context last used.
  40 */
  41#ifndef CONFIG_SMP
  42unsigned long mmu_context_cache_dat;
  43#else
  44unsigned long mmu_context_cache_dat[NR_CPUS];
  45#endif
  46static unsigned long hole_pages;
  47
  48/*
  49 * function prototype
  50 */
  51void __init paging_init(void);
  52void __init mem_init(void);
  53void free_initmem(void);
  54#ifdef CONFIG_BLK_DEV_INITRD
  55void 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
  63unsigned 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 */
  93extern unsigned long zone_sizes_init(void);
  94#endif  /* CONFIG_DISCONTIGMEM */
  95
  96/*======================================================================*
  97 * paging_init() : sets up the page tables
  98 *======================================================================*/
  99void __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
 114int __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 *======================================================================*/
 135void __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 *======================================================================*/
 185void 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 *======================================================================*/
 205void 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
 217