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