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         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 = alloc_bootmem_pages(PAGE_SIZE);
  97
  98         /*
  99          * Set up SFC/DFC registers (user data space).
 100          */
 101         set_fs (USER_DS);
 102
 103         zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
 104         free_area_init(zones_size);
 105 }
 106
 107 #endif /* CONFIG_MMU */
 108
 109 void free_initmem(void)
 110 {
 111 #ifndef CONFIG_MMU_SUN3
 112         free_initmem_default(-1);
 113 #endif /* CONFIG_MMU_SUN3 */
 114 }
 115
 116 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
 117 #define VECTORS &vectors[0]
 118 #else
 119 #define VECTORS _ramvec
 120 #endif
 121
 122 static inline void init_pointer_tables(void)
 123 {
 124 #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
 125         int i;
 126
 127         /* insert pointer tables allocated so far into the tablelist */
 128         init_pointer_table((unsigned long)kernel_pg_dir);
 129         for (i = 0; i < PTRS_PER_PGD; i++) {
 130                 if (pgd_present(kernel_pg_dir[i]))
 131                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
 132         }
 133
 134         /* insert also pointer table that we used to unmap the zero page */
 135         if (zero_pgtable)
 136                 init_pointer_table((unsigned long)zero_pgtable);
 137 #endif
 138 }
 139
 140 void __init mem_init(void)
 141 {
 142         /* this will put all memory onto the freelists */
 143         free_all_bootmem();
 144         init_pointer_tables();
 145         mem_init_print_info(NULL);
 146 }
 147
 148 #ifdef CONFIG_BLK_DEV_INITRD
 149 void free_initrd_mem(unsigned long start, unsigned long end)
 150 {
 151         free_reserved_area((void *)start, (void *)end, -1, "initrd");
 152 }
 153 #endif