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#include <asm/sections.h>
  32
  33pgd_t swapper_pg_dir[1024];
  34
  35/*
  36 * Cache of MMU context last used.
  37 */
  38#ifndef CONFIG_SMP
  39unsigned long mmu_context_cache_dat;
  40#else
  41unsigned long mmu_context_cache_dat[NR_CPUS];
  42#endif
  43
  44/*
  45 * function prototype
  46 */
  47void __init paging_init(void);
  48void __init mem_init(void);
  49void free_initmem(void);
  50#ifdef CONFIG_BLK_DEV_INITRD
  51void free_initrd_mem(unsigned long, unsigned long);
  52#endif
  53
  54/* It'd be good if these lines were in the standard header file. */
  55#define START_PFN(nid)          (NODE_DATA(nid)->bdata->node_min_pfn)
  56#define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
  57
  58#ifndef CONFIG_DISCONTIGMEM
  59void __init zone_sizes_init(void)
  60{
  61        unsigned long  zones_size[MAX_NR_ZONES] = {0, };
  62        unsigned long  max_dma;
  63        unsigned long  low;
  64        unsigned long  start_pfn;
  65
  66#ifdef CONFIG_MMU
  67        start_pfn = START_PFN(0);
  68        max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
  69        low = MAX_LOW_PFN(0);
  70
  71        if (low < max_dma){
  72                zones_size[ZONE_DMA] = low - start_pfn;
  73                zones_size[ZONE_NORMAL] = 0;
  74        } else {
  75                zones_size[ZONE_DMA] = low - start_pfn;
  76                zones_size[ZONE_NORMAL] = low - max_dma;
  77        }
  78#else
  79        zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
  80        zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
  81        start_pfn = __MEMORY_START >> PAGE_SHIFT;
  82#endif /* CONFIG_MMU */
  83
  84        free_area_init_node(0, zones_size, start_pfn, 0);
  85}
  86#else   /* CONFIG_DISCONTIGMEM */
  87extern void zone_sizes_init(void);
  88#endif  /* CONFIG_DISCONTIGMEM */
  89
  90/*======================================================================*
  91 * paging_init() : sets up the page tables
  92 *======================================================================*/
  93void __init paging_init(void)
  94{
  95#ifdef CONFIG_MMU
  96        int  i;
  97        pgd_t *pg_dir;
  98
  99        /* We don't need kernel mapping as hardware support that. */
 100        pg_dir = swapper_pg_dir;
 101
 102        for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
 103                pgd_val(pg_dir[i]) = 0;
 104#endif /* CONFIG_MMU */
 105        zone_sizes_init();
 106}
 107
 108/*======================================================================*
 109 * mem_init() :
 110 * orig : arch/sh/mm/init.c
 111 *======================================================================*/
 112void __init mem_init(void)
 113{
 114#ifndef CONFIG_MMU
 115        extern unsigned long memory_end;
 116
 117        high_memory = (void *)(memory_end & PAGE_MASK);
 118#else
 119        high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
 120#endif /* CONFIG_MMU */
 121
 122        /* clear the zero-page */
 123        memset(empty_zero_page, 0, PAGE_SIZE);
 124
 125        set_max_mapnr(get_num_physpages());
 126        free_all_bootmem();
 127        mem_init_print_info(NULL);
 128}
 129
 130/*======================================================================*
 131 * free_initmem() :
 132 * orig : arch/sh/mm/init.c
 133 *======================================================================*/
 134void free_initmem(void)
 135{
 136        free_initmem_default(-1);
 137}
 138
 139#ifdef CONFIG_BLK_DEV_INITRD
 140/*======================================================================*
 141 * free_initrd_mem() :
 142 * orig : arch/sh/mm/init.c
 143 *======================================================================*/
 144void free_initrd_mem(unsigned long start, unsigned long end)
 145{
 146        free_reserved_area((void *)start, (void *)end, -1, "initrd");
 147}
 148#endif
 149