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