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 static bootmem_data_t __initdata bootmem_data[MAX_NUMNODES]; 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 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_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 73 void show_mem(void) 74 { 75 pg_data_t *pgdat; 76 int free = 0, total = 0, reserved = 0, shared = 0; 77 int cached = 0; 78 int i; 79 80 printk("\nMem-info:\n"); 81 show_free_areas(); 82 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 83 for_each_online_pgdat(pgdat) { 84 for (i = 0; i < pgdat->node_spanned_pages; i++) { 85 struct page *page = pgdat->node_mem_map + i; 86 total++; 87 if (PageReserved(page)) 88 reserved++; 89 else if (PageSwapCache(page)) 90 cached++; 91 else if (!page_count(page)) 92 free++; 93 else 94 shared += page_count(page) - 1; 95 } 96 } 97 printk("%d pages of RAM\n",total); 98 printk("%d free pages\n",free); 99 printk("%d reserved pages\n",reserved); 100 printk("%d pages shared\n",shared); 101 printk("%d pages swap cached\n",cached); 102 } 103 104 extern void init_pointer_table(unsigned long ptable); 105 106 /* References to section boundaries */ 107 108 extern char _text[], _etext[]; 109 extern char __init_begin[], __init_end[]; 110 111 extern pmd_t *zero_pgtable; 112 113 void __init mem_init(void) 114 { 115 pg_data_t *pgdat; 116 int codepages = 0; 117 int datapages = 0; 118 int initpages = 0; 119 int i; 120 121 #ifdef CONFIG_ATARI 122 if (MACH_IS_ATARI) 123 atari_stram_mem_init_hook(); 124 #endif 125 126 /* this will put all memory onto the freelists */ 127 totalram_pages = num_physpages = 0; 128 for_each_online_pgdat(pgdat) { 129 num_physpages += pgdat->node_present_pages; 130 131 totalram_pages += free_all_bootmem_node(pgdat); 132 for (i = 0; i < pgdat->node_spanned_pages; i++) { 133 struct page *page = pgdat->node_mem_map + i; 134 char *addr = page_to_virt(page); 135 136 if (!PageReserved(page)) 137 continue; 138 if (addr >= _text && 139 addr < _etext) 140 codepages++; 141 else if (addr >= __init_begin && 142 addr < __init_end) 143 initpages++; 144 else 145 datapages++; 146 } 147 } 148 149 #ifndef CONFIG_SUN3 150 /* insert pointer tables allocated so far into the tablelist */ 151 init_pointer_table((unsigned long)kernel_pg_dir); 152 for (i = 0; i < PTRS_PER_PGD; i++) { 153 if (pgd_present(kernel_pg_dir[i])) 154 init_pointer_table(__pgd_page(kernel_pg_dir[i])); 155 } 156 157 /* insert also pointer table that we used to unmap the zero page */ 158 if (zero_pgtable) 159 init_pointer_table((unsigned long)zero_pgtable); 160 #endif 161 162 printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n", 163 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), 164 totalram_pages << (PAGE_SHIFT-10), 165 codepages << (PAGE_SHIFT-10), 166 datapages << (PAGE_SHIFT-10), 167 initpages << (PAGE_SHIFT-10)); 168 } 169 170 #ifdef CONFIG_BLK_DEV_INITRD 171 void free_initrd_mem(unsigned long start, unsigned long end) 172 { 173 int pages = 0; 174 for (; start < end; start += PAGE_SIZE) { 175 ClearPageReserved(virt_to_page(start)); 176 init_page_count(virt_to_page(start)); 177 free_page(start); 178 totalram_pages++; 179 pages++; 180 } 181 printk ("Freeing initrd memory: %dk freed\n", pages); 182 } 183 #endif 184