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 #ifdef CONFIG_MMU 44 45 pg_data_t pg_data_map[MAX_NUMNODES]; 46 EXPORT_SYMBOL(pg_data_map); 47 48 int m68k_virt_to_node_shift; 49 50 #ifndef CONFIG_SINGLE_MEMORY_CHUNK 51 pg_data_t *pg_data_table[65]; 52 EXPORT_SYMBOL(pg_data_table); 53 #endif 54 55 void __init m68k_setup_node(int node) 56 { 57 #ifndef CONFIG_SINGLE_MEMORY_CHUNK 58 struct m68k_mem_info *info = m68k_memory + node; 59 int i, end; 60 61 i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift(); 62 end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift(); 63 for (; i <= end; i++) { 64 if (pg_data_table[i]) 65 pr_warn("overlap at %u for chunk %u\n", i, node); 66 pg_data_table[i] = pg_data_map + node; 67 } 68 #endif 69 node_set_online(node); 70 } 71 72 #else /* CONFIG_MMU */ 73 74 /* 75 * paging_init() continues the virtual memory environment setup which 76 * was begun by the code in arch/head.S. 77 * The parameters are pointers to where to stick the starting and ending 78 * addresses of available kernel virtual memory. 79 */ 80 void __init paging_init(void) 81 { 82 /* 83 * Make sure start_mem is page aligned, otherwise bootmem and 84 * page_alloc get different views of the world. 85 */ 86 unsigned long end_mem = memory_end & PAGE_MASK; 87 unsigned long zones_size[MAX_NR_ZONES] = { 0, }; 88 89 high_memory = (void *) end_mem; 90 91 empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 92 if (!empty_zero_page) 93 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 94 __func__, PAGE_SIZE, PAGE_SIZE); 95 96 /* 97 * Set up SFC/DFC registers (user data space). 98 */ 99 set_fs (USER_DS); 100 101 zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; 102 free_area_init(zones_size); 103 } 104 105 #endif /* CONFIG_MMU */ 106 107 void free_initmem(void) 108 { 109 #ifndef CONFIG_MMU_SUN3 110 free_initmem_default(-1); 111 #endif /* CONFIG_MMU_SUN3 */ 112 } 113 114 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) 115 #define VECTORS &vectors[0] 116 #else 117 #define VECTORS _ramvec 118 #endif 119 120 static inline void init_pointer_tables(void) 121 { 122 #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE) 123 int i, j; 124 125 /* insert pointer tables allocated so far into the tablelist */ 126 init_pointer_table(kernel_pg_dir, TABLE_PGD); 127 for (i = 0; i < PTRS_PER_PGD; i++) { 128 pud_t *pud = (pud_t *)&kernel_pg_dir[i]; 129 pmd_t *pmd_dir; 130 131 if (!pud_present(*pud)) 132 continue; 133 134 pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]); 135 init_pointer_table(pmd_dir, TABLE_PMD); 136 137 for (j = 0; j < PTRS_PER_PMD; j++) { 138 pmd_t *pmd = &pmd_dir[j]; 139 pte_t *pte_dir; 140 141 if (!pmd_present(*pmd)) 142 continue; 143 144 pte_dir = (pte_t *)__pmd_page(*pmd); 145 init_pointer_table(pte_dir, TABLE_PTE); 146 } 147 } 148 #endif 149 } 150 151 void __init mem_init(void) 152 { 153 /* this will put all memory onto the freelists */ 154 memblock_free_all(); 155 init_pointer_tables(); 156 mem_init_print_info(NULL); 157 } 158