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Linux/arch/m68k/mm/init.c

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  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 static inline void init_pointer_tables(void)
124 {
125 #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
126         int i;
127 
128         /* insert pointer tables allocated so far into the tablelist */
129         init_pointer_table((unsigned long)kernel_pg_dir);
130         for (i = 0; i < PTRS_PER_PGD; i++) {
131                 if (pgd_present(kernel_pg_dir[i]))
132                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
133         }
134 
135         /* insert also pointer table that we used to unmap the zero page */
136         if (zero_pgtable)
137                 init_pointer_table((unsigned long)zero_pgtable);
138 #endif
139 }
140 
141 void __init mem_init(void)
142 {
143         /* this will put all memory onto the freelists */
144         free_all_bootmem();
145         init_pointer_tables();
146         mem_init_print_info(NULL);
147 }
148 
149 #ifdef CONFIG_BLK_DEV_INITRD
150 void free_initrd_mem(unsigned long start, unsigned long end)
151 {
152         free_reserved_area((void *)start, (void *)end, -1, "initrd");
153 }
154 #endif
155 

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