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 void __init arch_zone_limits_init(unsigned long *max_zone_pfns) 44 { 45 max_zone_pfns[ZONE_DMA] = PFN_DOWN(memblock_end_of_DRAM()); 46 } 47 48 #ifdef CONFIG_MMU 49 50 int m68k_virt_to_node_shift; 51 52 void __init m68k_setup_node(int node) 53 { 54 node_set_online(node); 55 } 56 57 #else /* CONFIG_MMU */ 58 59 /* 60 * paging_init() continues the virtual memory environment setup which 61 * was begun by the code in arch/head.S. 62 * The parameters are pointers to where to stick the starting and ending 63 * addresses of available kernel virtual memory. 64 */ 65 void __init paging_init(void) 66 { 67 /* 68 * Make sure start_mem is page aligned, otherwise bootmem and 69 * page_alloc get different views of the world. 70 */ 71 unsigned long end_mem = memory_end & PAGE_MASK; 72 73 high_memory = (void *) end_mem; 74 75 empty_zero_page = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 76 } 77 78 #endif /* CONFIG_MMU */ 79 80 void free_initmem(void) 81 { 82 #ifndef CONFIG_MMU_SUN3 83 free_initmem_default(-1); 84 #endif /* CONFIG_MMU_SUN3 */ 85 } 86 87 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) 88 #define VECTORS &vectors[0] 89 #else 90 #define VECTORS _ramvec 91 #endif 92 93 static inline void init_pointer_tables(void) 94 { 95 #if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE) 96 int i, j; 97 98 /* insert pointer tables allocated so far into the tablelist */ 99 init_pointer_table(kernel_pg_dir, TABLE_PGD); 100 for (i = 0; i < PTRS_PER_PGD; i++) { 101 pud_t *pud = (pud_t *)&kernel_pg_dir[i]; 102 pmd_t *pmd_dir; 103 104 if (!pud_present(*pud)) 105 continue; 106 107 pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]); 108 init_pointer_table(pmd_dir, TABLE_PMD); 109 110 for (j = 0; j < PTRS_PER_PMD; j++) { 111 pmd_t *pmd = &pmd_dir[j]; 112 pte_t *pte_dir; 113 114 if (!pmd_present(*pmd)) 115 continue; 116 117 pte_dir = (pte_t *)pmd_page_vaddr(*pmd); 118 init_pointer_table(pte_dir, TABLE_PTE); 119 } 120 } 121 #endif 122 } 123 124 void __init mem_init(void) 125 { 126 init_pointer_tables(); 127 } 128