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 if (pgd_present(kernel_pg_dir[i])) 134 init_pointer_table(__pgd_page(kernel_pg_dir[i])); 135 } 136 137 /* insert also pointer table that we used to unmap the zero page */ 138 if (zero_pgtable) 139 init_pointer_table((unsigned long)zero_pgtable); 140 #endif 141 } 142 143 void __init mem_init(void) 144 { 145 /* this will put all memory onto the freelists */ 146 memblock_free_all(); 147 init_pointer_tables(); 148 mem_init_print_info(NULL); 149 } 150 151 #ifdef CONFIG_BLK_DEV_INITRD 152 void free_initrd_mem(unsigned long start, unsigned long end) 153 { 154 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 155 } 156 #endif 157