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 21 #include <asm/setup.h> 22 #include <asm/uaccess.h> 23 #include <asm/page.h> 24 #include <asm/pgalloc.h> 25 #include <asm/system.h> 26 #include <asm/machdep.h> 27 #include <asm/io.h> 28 #ifdef CONFIG_ATARI 29 #include <asm/atari_stram.h> 30 #endif 31 #include <asm/tlb.h> 32 33 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 34 35 pg_data_t pg_data_map[MAX_NUMNODES]; 36 EXPORT_SYMBOL(pg_data_map); 37 38 int m68k_virt_to_node_shift; 39 40 #ifndef CONFIG_SINGLE_MEMORY_CHUNK 41 pg_data_t *pg_data_table[65]; 42 EXPORT_SYMBOL(pg_data_table); 43 #endif 44 45 void __init m68k_setup_node(int node) 46 { 47 #ifndef CONFIG_SINGLE_MEMORY_CHUNK 48 struct mem_info *info = m68k_memory + node; 49 int i, end; 50 51 i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift(); 52 end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift(); 53 for (; i <= end; i++) { 54 if (pg_data_table[i]) 55 printk("overlap at %u for chunk %u\n", i, node); 56 pg_data_table[i] = pg_data_map + node; 57 } 58 #endif 59 pg_data_map[node].bdata = bootmem_node_data + node; 60 node_set_online(node); 61 } 62 63 64 /* 65 * ZERO_PAGE is a special page that is used for zero-initialized 66 * data and COW. 67 */ 68 69 void *empty_zero_page; 70 EXPORT_SYMBOL(empty_zero_page); 71 72 extern void init_pointer_table(unsigned long ptable); 73 74 /* References to section boundaries */ 75 76 extern char _text[], _etext[]; 77 extern char __init_begin[], __init_end[]; 78 79 extern pmd_t *zero_pgtable; 80 81 void __init mem_init(void) 82 { 83 pg_data_t *pgdat; 84 int codepages = 0; 85 int datapages = 0; 86 int initpages = 0; 87 int i; 88 89 #ifdef CONFIG_ATARI 90 if (MACH_IS_ATARI) 91 atari_stram_mem_init_hook(); 92 #endif 93 94 /* this will put all memory onto the freelists */ 95 totalram_pages = num_physpages = 0; 96 for_each_online_pgdat(pgdat) { 97 num_physpages += pgdat->node_present_pages; 98 99 totalram_pages += free_all_bootmem_node(pgdat); 100 for (i = 0; i < pgdat->node_spanned_pages; i++) { 101 struct page *page = pgdat->node_mem_map + i; 102 char *addr = page_to_virt(page); 103 104 if (!PageReserved(page)) 105 continue; 106 if (addr >= _text && 107 addr < _etext) 108 codepages++; 109 else if (addr >= __init_begin && 110 addr < __init_end) 111 initpages++; 112 else 113 datapages++; 114 } 115 } 116 117 #ifndef CONFIG_SUN3 118 /* insert pointer tables allocated so far into the tablelist */ 119 init_pointer_table((unsigned long)kernel_pg_dir); 120 for (i = 0; i < PTRS_PER_PGD; i++) { 121 if (pgd_present(kernel_pg_dir[i])) 122 init_pointer_table(__pgd_page(kernel_pg_dir[i])); 123 } 124 125 /* insert also pointer table that we used to unmap the zero page */ 126 if (zero_pgtable) 127 init_pointer_table((unsigned long)zero_pgtable); 128 #endif 129 130 printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n", 131 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), 132 totalram_pages << (PAGE_SHIFT-10), 133 codepages << (PAGE_SHIFT-10), 134 datapages << (PAGE_SHIFT-10), 135 initpages << (PAGE_SHIFT-10)); 136 } 137 138 #ifdef CONFIG_BLK_DEV_INITRD 139 void free_initrd_mem(unsigned long start, unsigned long end) 140 { 141 int pages = 0; 142 for (; start < end; start += PAGE_SIZE) { 143 ClearPageReserved(virt_to_page(start)); 144 init_page_count(virt_to_page(start)); 145 free_page(start); 146 totalram_pages++; 147 pages++; 148 } 149 printk ("Freeing initrd memory: %dk freed\n", pages); 150 } 151 #endif 152