arch/m68k/mm/init.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/m68k/mm/init.c
   4  *
   5  *  Copyright (C) 1995  Hamish Macdonald
   6  *
   7  *  Contains common initialization routines, specific init code moved
   8  *  to motorola.c and sun3mmu.c
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/signal.h>
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <linux/swap.h>
  16 #include <linux/kernel.h>
  17 #include <linux/string.h>
  18 #include <linux/types.h>
  19 #include <linux/init.h>
  20 #include <linux/bootmem.h>
  21 #include <linux/gfp.h>
  22
  23 #include <asm/setup.h>
  24 #include <linux/uaccess.h>
  25 #include <asm/page.h>
  26 #include <asm/pgalloc.h>
  27 #include <asm/traps.h>
  28 #include <asm/machdep.h>
  29 #include <asm/io.h>
  30 #ifdef CONFIG_ATARI
  31 #include <asm/atari_stram.h>
  32 #endif
  33 #include <asm/sections.h>
  34 #include <asm/tlb.h>
  35
  36 /*
  37  * ZERO_PAGE is a special page that is used for zero-initialized
  38  * data and COW.
  39  */
  40 void *empty_zero_page;
  41 EXPORT_SYMBOL(empty_zero_page);
  42
  43 #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
  44 extern void init_pointer_table(unsigned long ptable);
  45 extern pmd_t *zero_pgtable;
  46 #endif
  47
  48 #ifdef CONFIG_MMU
  49
  50 pg_data_t pg_data_map[MAX_NUMNODES];
  51 EXPORT_SYMBOL(pg_data_map);
  52
  53 int m68k_virt_to_node_shift;
  54
  55 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
  56 pg_data_t *pg_data_table[65];
  57 EXPORT_SYMBOL(pg_data_table);
  58 #endif
  59
  60 void __init m68k_setup_node(int node)
  61 {
  62 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
  63         struct m68k_mem_info *info = m68k_memory + node;
  64         int i, end;
  65
  66         i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
  67         end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
  68         for (; i <= end; i++) {
  69                 if (pg_data_table[i])
  70                         pr_warn("overlap at %u for chunk %u\n", i, node);
  71                 pg_data_table[i] = pg_data_map + node;
  72         }
  73 #endif
  74         pg_data_map[node].bdata = bootmem_node_data + node;
  75         node_set_online(node);
  76 }
  77
  78 #else /* CONFIG_MMU */
  79
  80 /*
  81  * paging_init() continues the virtual memory environment setup which
  82  * was begun by the code in arch/head.S.
  83  * The parameters are pointers to where to stick the starting and ending
  84  * addresses of available kernel virtual memory.
  85  */
  86 void __init paging_init(void)
  87 {
  88         /*
  89          * Make sure start_mem is page aligned, otherwise bootmem and
  90          * page_alloc get different views of the world.
  91          */
  92         unsigned long end_mem = memory_end & PAGE_MASK;
  93         unsigned long zones_size[MAX_NR_ZONES] = { 0, };
  94
  95         high_memory = (void *) end_mem;
  96
  97         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
  98
  99         /*
 100          * Set up SFC/DFC registers (user data space).
 101          */
 102         set_fs (USER_DS);
 103
 104         zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
 105         free_area_init(zones_size);
 106 }
 107
 108 #endif /* CONFIG_MMU */
 109
 110 void free_initmem(void)
 111 {
 112 #ifndef CONFIG_MMU_SUN3
 113         free_initmem_default(-1);
 114 #endif /* CONFIG_MMU_SUN3 */
 115 }
 116
 117 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
 118 #define VECTORS &vectors[0]
 119 #else
 120 #define VECTORS _ramvec
 121 #endif
 122
 123 void __init print_memmap(void)
 124 {
 125 #define UL(x) ((unsigned long) (x))
 126 #define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
 127 #define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
 128 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
 129
 130         pr_notice("Virtual kernel memory layout:\n"
 131                 "    vector  : 0x%08lx - 0x%08lx   (%4ld KiB)\n"
 132                 "    kmap    : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
 133                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
 134                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
 135                 "      .init : 0x%p" " - 0x%p" "   (%4d KiB)\n"
 136                 "      .text : 0x%p" " - 0x%p" "   (%4d KiB)\n"
 137                 "      .data : 0x%p" " - 0x%p" "   (%4d KiB)\n"
 138                 "      .bss  : 0x%p" " - 0x%p" "   (%4d KiB)\n",
 139                 MLK(VECTORS, VECTORS + 256),
 140                 MLM(KMAP_START, KMAP_END),
 141                 MLM(VMALLOC_START, VMALLOC_END),
 142                 MLM(PAGE_OFFSET, (unsigned long)high_memory),
 143                 MLK_ROUNDUP(__init_begin, __init_end),
 144                 MLK_ROUNDUP(_stext, _etext),
 145                 MLK_ROUNDUP(_sdata, _edata),
 146                 MLK_ROUNDUP(__bss_start, __bss_stop));
 147 }
 148
 149 static inline void init_pointer_tables(void)
 150 {
 151 #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 152         int i;
 153
 154         /* insert pointer tables allocated so far into the tablelist */
 155         init_pointer_table((unsigned long)kernel_pg_dir);
 156         for (i = 0; i < PTRS_PER_PGD; i++) {
 157                 if (pgd_present(kernel_pg_dir[i]))
 158                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
 159         }
 160
 161         /* insert also pointer table that we used to unmap the zero page */
 162         if (zero_pgtable)
 163                 init_pointer_table((unsigned long)zero_pgtable);
 164 #endif
 165 }
 166
 167 void __init mem_init(void)
 168 {
 169         /* this will put all memory onto the freelists */
 170         free_all_bootmem();
 171         init_pointer_tables();
 172         mem_init_print_info(NULL);
 173         print_memmap();
 174 }
 175
 176 #ifdef CONFIG_BLK_DEV_INITRD
 177 void free_initrd_mem(unsigned long start, unsigned long end)
 178 {
 179         free_reserved_area((void *)start, (void *)end, -1, "initrd");
 180 }
 181 #endif