arch/m32r/mm/init.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/m32r/mm/init.c
   4  *
   5  *  Copyright (c) 2001, 2002  Hitoshi Yamamoto
   6  *
   7  *  Some code taken from sh version.
   8  *    Copyright (C) 1999  Niibe Yutaka
   9  *    Based on linux/arch/i386/mm/init.c:
  10  *      Copyright (C) 1995  Linus Torvalds
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/mm.h>
  16 #include <linux/pagemap.h>
  17 #include <linux/bootmem.h>
  18 #include <linux/swap.h>
  19 #include <linux/highmem.h>
  20 #include <linux/bitops.h>
  21 #include <linux/nodemask.h>
  22 #include <linux/pfn.h>
  23 #include <linux/gfp.h>
  24 #include <asm/types.h>
  25 #include <asm/processor.h>
  26 #include <asm/page.h>
  27 #include <asm/pgtable.h>
  28 #include <asm/pgalloc.h>
  29 #include <asm/mmu_context.h>
  30 #include <asm/setup.h>
  31 #include <asm/tlb.h>
  32 #include <asm/sections.h>
  33
  34 pgd_t swapper_pg_dir[1024];
  35
  36 /*
  37  * Cache of MMU context last used.
  38  */
  39 #ifndef CONFIG_SMP
  40 unsigned long mmu_context_cache_dat;
  41 #else
  42 unsigned long mmu_context_cache_dat[NR_CPUS];
  43 #endif
  44
  45 /*
  46  * function prototype
  47  */
  48 void __init paging_init(void);
  49 void __init mem_init(void);
  50 void free_initmem(void);
  51 #ifdef CONFIG_BLK_DEV_INITRD
  52 void free_initrd_mem(unsigned long, unsigned long);
  53 #endif
  54
  55 /* It'd be good if these lines were in the standard header file. */
  56 #define START_PFN(nid)          (NODE_DATA(nid)->bdata->node_min_pfn)
  57 #define MAX_LOW_PFN(nid)        (NODE_DATA(nid)->bdata->node_low_pfn)
  58
  59 #ifndef CONFIG_DISCONTIGMEM
  60 void __init zone_sizes_init(void)
  61 {
  62         unsigned long  zones_size[MAX_NR_ZONES] = {0, };
  63         unsigned long  start_pfn;
  64
  65 #ifdef CONFIG_MMU
  66         {
  67                 unsigned long  low;
  68                 unsigned long  max_dma;
  69
  70                 start_pfn = START_PFN(0);
  71                 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
  72                 low = MAX_LOW_PFN(0);
  73
  74                 if (low < max_dma) {
  75                         zones_size[ZONE_DMA] = low - start_pfn;
  76                         zones_size[ZONE_NORMAL] = 0;
  77                 } else {
  78                         zones_size[ZONE_DMA] = low - start_pfn;
  79                         zones_size[ZONE_NORMAL] = low - max_dma;
  80                 }
  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 #else   /* CONFIG_DISCONTIGMEM */
  91 extern void zone_sizes_init(void);
  92 #endif  /* CONFIG_DISCONTIGMEM */
  93
  94 /*======================================================================*
  95  * paging_init() : sets up the page tables
  96  *======================================================================*/
  97 void __init paging_init(void)
  98 {
  99 #ifdef CONFIG_MMU
 100         int  i;
 101         pgd_t *pg_dir;
 102
 103         /* We don't need kernel mapping as hardware support that. */
 104         pg_dir = swapper_pg_dir;
 105
 106         for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
 107                 pgd_val(pg_dir[i]) = 0;
 108 #endif /* CONFIG_MMU */
 109         zone_sizes_init();
 110 }
 111
 112 /*======================================================================*
 113  * mem_init() :
 114  * orig : arch/sh/mm/init.c
 115  *======================================================================*/
 116 void __init mem_init(void)
 117 {
 118 #ifndef CONFIG_MMU
 119         extern unsigned long memory_end;
 120
 121         high_memory = (void *)(memory_end & PAGE_MASK);
 122 #else
 123         high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
 124 #endif /* CONFIG_MMU */
 125
 126         /* clear the zero-page */
 127         memset(empty_zero_page, 0, PAGE_SIZE);
 128
 129         set_max_mapnr(get_num_physpages());
 130         free_all_bootmem();
 131         mem_init_print_info(NULL);
 132 }
 133
 134 /*======================================================================*
 135  * free_initmem() :
 136  * orig : arch/sh/mm/init.c
 137  *======================================================================*/
 138 void free_initmem(void)
 139 {
 140         free_initmem_default(-1);
 141 }
 142
 143 #ifdef CONFIG_BLK_DEV_INITRD
 144 /*======================================================================*
 145  * free_initrd_mem() :
 146  * orig : arch/sh/mm/init.c
 147  *======================================================================*/
 148 void free_initrd_mem(unsigned long start, unsigned long end)
 149 {
 150         free_reserved_area((void *)start, (void *)end, -1, "initrd");
 151 }
 152 #endif