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/traps.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 /* 36 * ZERO_PAGE is a special page that is used for zero-initialized 37 * data and COW. 38 */ 39 void *empty_zero_page; 40 EXPORT_SYMBOL(empty_zero_page); 41 42 #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE) 43 extern void init_pointer_table(unsigned long ptable); 44 extern pmd_t *zero_pgtable; 45 #endif 46 47 #ifdef CONFIG_MMU 48 49 pg_data_t pg_data_map[MAX_NUMNODES]; 50 EXPORT_SYMBOL(pg_data_map); 51 52 int m68k_virt_to_node_shift; 53 54 #ifndef CONFIG_SINGLE_MEMORY_CHUNK 55 pg_data_t *pg_data_table[65]; 56 EXPORT_SYMBOL(pg_data_table); 57 #endif 58 59 void __init m68k_setup_node(int node) 60 { 61 #ifndef CONFIG_SINGLE_MEMORY_CHUNK 62 struct mem_info *info = m68k_memory + node; 63 int i, end; 64 65 i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift(); 66 end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift(); 67 for (; i <= end; i++) { 68 if (pg_data_table[i]) 69 printk("overlap at %u for chunk %u\n", i, node); 70 pg_data_table[i] = pg_data_map + node; 71 } 72 #endif 73 pg_data_map[node].bdata = bootmem_node_data + node; 74 node_set_online(node); 75 } 76 77 #else /* CONFIG_MMU */ 78 79 /* 80 * paging_init() continues the virtual memory environment setup which 81 * was begun by the code in arch/head.S. 82 * The parameters are pointers to where to stick the starting and ending 83 * addresses of available kernel virtual memory. 84 */ 85 void __init paging_init(void) 86 { 87 /* 88 * Make sure start_mem is page aligned, otherwise bootmem and 89 * page_alloc get different views of the world. 90 */ 91 unsigned long end_mem = memory_end & PAGE_MASK; 92 unsigned long zones_size[MAX_NR_ZONES] = { 0, }; 93 94 high_memory = (void *) end_mem; 95 96 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); 97 memset(empty_zero_page, 0, PAGE_SIZE); 98 99 /* 100 * Set up SFC/DFC registers (user data space). 101 */ 102 set_fs (USER_DS); 103 104 zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; 105 free_area_init(zones_size); 106 } 107 108 #endif /* CONFIG_MMU */ 109 110 void free_initmem(void) 111 { 112 #ifndef CONFIG_MMU_SUN3 113 unsigned long addr; 114 115 addr = (unsigned long) __init_begin; 116 for (; addr < ((unsigned long) __init_end); addr += PAGE_SIZE) { 117 ClearPageReserved(virt_to_page(addr)); 118 init_page_count(virt_to_page(addr)); 119 free_page(addr); 120 totalram_pages++; 121 } 122 pr_notice("Freeing unused kernel memory: %luk freed (0x%x - 0x%x)\n", 123 (addr - (unsigned long) __init_begin) >> 10, 124 (unsigned int) __init_begin, (unsigned int) __init_end); 125 #endif /* CONFIG_MMU_SUN3 */ 126 } 127 128 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) 129 #define VECTORS &vectors[0] 130 #else 131 #define VECTORS _ramvec 132 #endif 133 134 void __init print_memmap(void) 135 { 136 #define UL(x) ((unsigned long) (x)) 137 #define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10 138 #define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20 139 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024) 140 141 pr_notice("Virtual kernel memory layout:\n" 142 " vector : 0x%08lx - 0x%08lx (%4ld KiB)\n" 143 " kmap : 0x%08lx - 0x%08lx (%4ld MiB)\n" 144 " vmalloc : 0x%08lx - 0x%08lx (%4ld MiB)\n" 145 " lowmem : 0x%08lx - 0x%08lx (%4ld MiB)\n" 146 " .init : 0x%p" " - 0x%p" " (%4d KiB)\n" 147 " .text : 0x%p" " - 0x%p" " (%4d KiB)\n" 148 " .data : 0x%p" " - 0x%p" " (%4d KiB)\n" 149 " .bss : 0x%p" " - 0x%p" " (%4d KiB)\n", 150 MLK(VECTORS, VECTORS + 256), 151 MLM(KMAP_START, KMAP_END), 152 MLM(VMALLOC_START, VMALLOC_END), 153 MLM(PAGE_OFFSET, (unsigned long)high_memory), 154 MLK_ROUNDUP(__init_begin, __init_end), 155 MLK_ROUNDUP(_stext, _etext), 156 MLK_ROUNDUP(_sdata, _edata), 157 MLK_ROUNDUP(__bss_start, __bss_stop)); 158 } 159 160 void __init mem_init(void) 161 { 162 pg_data_t *pgdat; 163 int codepages = 0; 164 int datapages = 0; 165 int initpages = 0; 166 int i; 167 168 /* this will put all memory onto the freelists */ 169 totalram_pages = num_physpages = 0; 170 for_each_online_pgdat(pgdat) { 171 num_physpages += pgdat->node_present_pages; 172 173 totalram_pages += free_all_bootmem_node(pgdat); 174 for (i = 0; i < pgdat->node_spanned_pages; i++) { 175 struct page *page = pgdat->node_mem_map + i; 176 char *addr = page_to_virt(page); 177 178 if (!PageReserved(page)) 179 continue; 180 if (addr >= _text && 181 addr < _etext) 182 codepages++; 183 else if (addr >= __init_begin && 184 addr < __init_end) 185 initpages++; 186 else 187 datapages++; 188 } 189 } 190 191 #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE) 192 /* insert pointer tables allocated so far into the tablelist */ 193 init_pointer_table((unsigned long)kernel_pg_dir); 194 for (i = 0; i < PTRS_PER_PGD; i++) { 195 if (pgd_present(kernel_pg_dir[i])) 196 init_pointer_table(__pgd_page(kernel_pg_dir[i])); 197 } 198 199 /* insert also pointer table that we used to unmap the zero page */ 200 if (zero_pgtable) 201 init_pointer_table((unsigned long)zero_pgtable); 202 #endif 203 204 pr_info("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n", 205 nr_free_pages() << (PAGE_SHIFT-10), 206 totalram_pages << (PAGE_SHIFT-10), 207 codepages << (PAGE_SHIFT-10), 208 datapages << (PAGE_SHIFT-10), 209 initpages << (PAGE_SHIFT-10)); 210 print_memmap(); 211 } 212 213 #ifdef CONFIG_BLK_DEV_INITRD 214 void free_initrd_mem(unsigned long start, unsigned long end) 215 { 216 int pages = 0; 217 for (; start < end; start += PAGE_SIZE) { 218 ClearPageReserved(virt_to_page(start)); 219 init_page_count(virt_to_page(start)); 220 free_page(start); 221 totalram_pages++; 222 pages++; 223 } 224 pr_notice("Freeing initrd memory: %dk freed\n", 225 pages << (PAGE_SHIFT - 10)); 226 } 227 #endif 228