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
  33 pgd_t swapper_pg_dir[1024];
  34
  35 /*
  36  * Cache of MMU context last used.
  37  */
  38 #ifndef CONFIG_SMP
  39 unsigned long mmu_context_cache_dat;
  40 #else
  41 unsigned long mmu_context_cache_dat[NR_CPUS];
  42 #endif
  43
  44 /*
  45  * function prototype
  46  */
  47 void __init paging_init(void);
  48 void __init mem_init(void);
  49 void free_initmem(void);
  50 #ifdef CONFIG_BLK_DEV_INITRD
  51 void 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
  59 void __init zone_sizes_init(void)
  60 {
  61         unsigned long  zones_size[MAX_NR_ZONES] = {0, };
  62         unsigned long  start_pfn;
  63
  64 #ifdef CONFIG_MMU
  65         {
  66                 unsigned long  low;
  67                 unsigned long  max_dma;
  68
  69                 start_pfn = START_PFN(0);
  70                 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
  71                 low = MAX_LOW_PFN(0);
  72
  73                 if (low < max_dma) {
  74                         zones_size[ZONE_DMA] = low - start_pfn;
  75                         zones_size[ZONE_NORMAL] = 0;
  76                 } else {
  77                         zones_size[ZONE_DMA] = low - start_pfn;
  78                         zones_size[ZONE_NORMAL] = low - max_dma;
  79                 }
  80         }
  81 #else
  82         zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
  83         zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
  84         start_pfn = __MEMORY_START >> PAGE_SHIFT;
  85 #endif /* CONFIG_MMU */
  86
  87         free_area_init_node(0, zones_size, start_pfn, 0);
  88 }
  89 #else   /* CONFIG_DISCONTIGMEM */
  90 extern void zone_sizes_init(void);
  91 #endif  /* CONFIG_DISCONTIGMEM */
  92
  93 /*======================================================================*
  94  * paging_init() : sets up the page tables
  95  *======================================================================*/
  96 void __init paging_init(void)
  97 {
  98 #ifdef CONFIG_MMU
  99         int  i;
 100         pgd_t *pg_dir;
 101
 102         /* We don't need kernel mapping as hardware support that. */
 103         pg_dir = swapper_pg_dir;
 104
 105         for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
 106                 pgd_val(pg_dir[i]) = 0;
 107 #endif /* CONFIG_MMU */
 108         zone_sizes_init();
 109 }
 110
 111 /*======================================================================*
 112  * mem_init() :
 113  * orig : arch/sh/mm/init.c
 114  *======================================================================*/
 115 void __init mem_init(void)
 116 {
 117 #ifndef CONFIG_MMU
 118         extern unsigned long memory_end;
 119
 120         high_memory = (void *)(memory_end & PAGE_MASK);
 121 #else
 122         high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
 123 #endif /* CONFIG_MMU */
 124
 125         /* clear the zero-page */
 126         memset(empty_zero_page, 0, PAGE_SIZE);
 127
 128         set_max_mapnr(get_num_physpages());
 129         free_all_bootmem();
 130         mem_init_print_info(NULL);
 131 }
 132
 133 /*======================================================================*
 134  * free_initmem() :
 135  * orig : arch/sh/mm/init.c
 136  *======================================================================*/
 137 void free_initmem(void)
 138 {
 139         free_initmem_default(-1);
 140 }
 141
 142 #ifdef CONFIG_BLK_DEV_INITRD
 143 /*======================================================================*
 144  * free_initrd_mem() :
 145  * orig : arch/sh/mm/init.c
 146  *======================================================================*/
 147 void free_initrd_mem(unsigned long start, unsigned long end)
 148 {
 149         free_reserved_area((void *)start, (void *)end, -1, "initrd");
 150 }
 151 #endif