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/memblock.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         node_set_online(node);
  75 }
  76
  77 #else /* CONFIG_MMU */
  78
  79 /*
  80  * paging_init() continues the virtual memory environment setup which
  81  * was begun by the code in arch/head.S.
  82  * The parameters are pointers to where to stick the starting and ending
  83  * addresses of available kernel virtual memory.
  84  */
  85 void __init paging_init(void)
  86 {
  87         /*
  88          * Make sure start_mem is page aligned, otherwise bootmem and
  89          * page_alloc get different views of the world.
  90          */
  91         unsigned long end_mem = memory_end & PAGE_MASK;
  92         unsigned long zones_size[MAX_NR_ZONES] = { 0, };
  93
  94         high_memory = (void *) end_mem;
  95
  96         empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
  97         if (!empty_zero_page)
  98                 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
  99                       __func__, PAGE_SIZE, PAGE_SIZE);
 100
 101         /*
 102          * Set up SFC/DFC registers (user data space).
 103          */
 104         set_fs (USER_DS);
 105
 106         zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
 107         free_area_init(zones_size);
 108 }
 109
 110 #endif /* CONFIG_MMU */
 111
 112 void free_initmem(void)
 113 {
 114 #ifndef CONFIG_MMU_SUN3
 115         free_initmem_default(-1);
 116 #endif /* CONFIG_MMU_SUN3 */
 117 }
 118
 119 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
 120 #define VECTORS &vectors[0]
 121 #else
 122 #define VECTORS _ramvec
 123 #endif
 124
 125 static inline void init_pointer_tables(void)
 126 {
 127 #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 128         int i;
 129
 130         /* insert pointer tables allocated so far into the tablelist */
 131         init_pointer_table((unsigned long)kernel_pg_dir);
 132         for (i = 0; i < PTRS_PER_PGD; i++) {
 133                 pud_t *pud = (pud_t *)(&kernel_pg_dir[i]);
 134
 135                 if (pud_present(*pud))
 136                         init_pointer_table(pgd_page_vaddr(kernel_pg_dir[i]));
 137         }
 138
 139         /* insert also pointer table that we used to unmap the zero page */
 140         if (zero_pgtable)
 141                 init_pointer_table((unsigned long)zero_pgtable);
 142 #endif
 143 }
 144
 145 void __init mem_init(void)
 146 {
 147         /* this will put all memory onto the freelists */
 148         memblock_free_all();
 149         init_pointer_tables();
 150         mem_init_print_info(NULL);
 151 }