1 /* 2 * linux/arch/m68k/mm/init.c 3 * 4 * Copyright (C) 1995 Hamish Macdonald 5 * 6 * Contains common initialization routines, specific init code moved 7 * to motorola.c and sun3mmu.c 8 */ 9 10 #include <linux/module.h> 11 #include <linux/signal.h> 12 #include <linux/sched.h> 13 #include <linux/mm.h> 14 #include <linux/swap.h> 15 #include <linux/kernel.h> 16 #include <linux/string.h> 17 #include <linux/types.h> 18 #include <linux/init.h> 19 #include <linux/bootmem.h> 20 #include <linux/gfp.h> 21 22 #include <asm/setup.h> 23 #include <asm/uaccess.h> 24 #include <asm/page.h> 25 #include <asm/pgalloc.h> 26 #include <asm/system.h> 27 #include <asm/machdep.h> 28 #include <asm/io.h> 29 #ifdef CONFIG_ATARI 30 #include <asm/atari_stram.h> 31 #endif 32 #include <asm/sections.h> 33 #include <asm/tlb.h> 34 35 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 36 37 pg_data_t pg_data_map[MAX_NUMNODES]; 38 EXPORT_SYMBOL(pg_data_map); 39 40 int m68k_virt_to_node_shift; 41 42 #ifndef CONFIG_SINGLE_MEMORY_CHUNK 43 pg_data_t *pg_data_table[65]; 44 EXPORT_SYMBOL(pg_data_table); 45 #endif 46 47 void __init m68k_setup_node(int node) 48 { 49 #ifndef CONFIG_SINGLE_MEMORY_CHUNK 50 struct mem_info *info = m68k_memory + node; 51 int i, end; 52 53 i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift(); 54 end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift(); 55 for (; i <= end; i++) { 56 if (pg_data_table[i]) 57 printk("overlap at %u for chunk %u\n", i, node); 58 pg_data_table[i] = pg_data_map + node; 59 } 60 #endif 61 pg_data_map[node].bdata = bootmem_node_data + node; 62 node_set_online(node); 63 } 64 65 66 /* 67 * ZERO_PAGE is a special page that is used for zero-initialized 68 * data and COW. 69 */ 70 71 void *empty_zero_page; 72 EXPORT_SYMBOL(empty_zero_page); 73 74 extern void init_pointer_table(unsigned long ptable); 75 76 /* References to section boundaries */ 77 78 extern pmd_t *zero_pgtable; 79 80 void __init mem_init(void) 81 { 82 pg_data_t *pgdat; 83 int codepages = 0; 84 int datapages = 0; 85 int initpages = 0; 86 int i; 87 88 #ifdef CONFIG_ATARI 89 if (MACH_IS_ATARI) 90 atari_stram_mem_init_hook(); 91 #endif 92 93 /* this will put all memory onto the freelists */ 94 totalram_pages = num_physpages = 0; 95 for_each_online_pgdat(pgdat) { 96 num_physpages += pgdat->node_present_pages; 97 98 totalram_pages += free_all_bootmem_node(pgdat); 99 for (i = 0; i < pgdat->node_spanned_pages; i++) { 100 struct page *page = pgdat->node_mem_map + i; 101 char *addr = page_to_virt(page); 102 103 if (!PageReserved(page)) 104 continue; 105 if (addr >= _text && 106 addr < _etext) 107 codepages++; 108 else if (addr >= __init_begin && 109 addr < __init_end) 110 initpages++; 111 else 112 datapages++; 113 } 114 } 115 116 #ifndef CONFIG_SUN3 117 /* insert pointer tables allocated so far into the tablelist */ 118 init_pointer_table((unsigned long)kernel_pg_dir); 119 for (i = 0; i < PTRS_PER_PGD; i++) { 120 if (pgd_present(kernel_pg_dir[i])) 121 init_pointer_table(__pgd_page(kernel_pg_dir[i])); 122 } 123 124 /* insert also pointer table that we used to unmap the zero page */ 125 if (zero_pgtable) 126 init_pointer_table((unsigned long)zero_pgtable); 127 #endif 128 129 printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n", 130 nr_free_pages() << (PAGE_SHIFT-10), 131 totalram_pages << (PAGE_SHIFT-10), 132 codepages << (PAGE_SHIFT-10), 133 datapages << (PAGE_SHIFT-10), 134 initpages << (PAGE_SHIFT-10)); 135 } 136 137 #ifdef CONFIG_BLK_DEV_INITRD 138 void free_initrd_mem(unsigned long start, unsigned long end) 139 { 140 int pages = 0; 141 for (; start < end; start += PAGE_SIZE) { 142 ClearPageReserved(virt_to_page(start)); 143 init_page_count(virt_to_page(start)); 144 free_page(start); 145 totalram_pages++; 146 pages++; 147 } 148 printk ("Freeing initrd memory: %dk freed\n", pages); 149 } 150 #endif 151