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