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/signal.h> 11 #include <linux/sched.h> 12 #include <linux/mm.h> 13 #include <linux/swap.h> 14 #include <linux/kernel.h> 15 #include <linux/string.h> 16 #include <linux/types.h> 17 #include <linux/init.h> 18 #include <linux/bootmem.h> 19 20 #include <asm/setup.h> 21 #include <asm/uaccess.h> 22 #include <asm/page.h> 23 #include <asm/pgalloc.h> 24 #include <asm/system.h> 25 #include <asm/machdep.h> 26 #include <asm/io.h> 27 #ifdef CONFIG_ATARI 28 #include <asm/atari_stram.h> 29 #endif 30 #include <asm/tlb.h> 31 32 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 33 34 /* 35 * ZERO_PAGE is a special page that is used for zero-initialized 36 * data and COW. 37 */ 38 39 void *empty_zero_page; 40 41 void show_mem(void) 42 { 43 unsigned long i; 44 int free = 0, total = 0, reserved = 0, shared = 0; 45 int cached = 0; 46 47 printk("\nMem-info:\n"); 48 show_free_areas(); 49 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 50 i = max_mapnr; 51 while (i-- > 0) { 52 total++; 53 if (PageReserved(mem_map+i)) 54 reserved++; 55 else if (PageSwapCache(mem_map+i)) 56 cached++; 57 else if (!page_count(mem_map+i)) 58 free++; 59 else 60 shared += page_count(mem_map+i) - 1; 61 } 62 printk("%d pages of RAM\n",total); 63 printk("%d free pages\n",free); 64 printk("%d reserved pages\n",reserved); 65 printk("%d pages shared\n",shared); 66 printk("%d pages swap cached\n",cached); 67 } 68 69 extern void init_pointer_table(unsigned long ptable); 70 71 /* References to section boundaries */ 72 73 extern char _text, _etext, _edata, __bss_start, _end; 74 extern char __init_begin, __init_end; 75 76 extern pmd_t *zero_pgtable; 77 78 void __init mem_init(void) 79 { 80 int codepages = 0; 81 int datapages = 0; 82 int initpages = 0; 83 unsigned long tmp; 84 #ifndef CONFIG_SUN3 85 int i; 86 #endif 87 88 max_mapnr = num_physpages = (((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT); 89 90 #ifdef CONFIG_ATARI 91 if (MACH_IS_ATARI) 92 atari_stram_mem_init_hook(); 93 #endif 94 95 /* this will put all memory onto the freelists */ 96 totalram_pages = free_all_bootmem(); 97 98 for (tmp = PAGE_OFFSET ; tmp < (unsigned long)high_memory; tmp += PAGE_SIZE) { 99 if (PageReserved(virt_to_page(tmp))) { 100 if (tmp >= (unsigned long)&_text 101 && tmp < (unsigned long)&_etext) 102 codepages++; 103 else if (tmp >= (unsigned long) &__init_begin 104 && tmp < (unsigned long) &__init_end) 105 initpages++; 106 else 107 datapages++; 108 continue; 109 } 110 } 111 112 #ifndef CONFIG_SUN3 113 /* insert pointer tables allocated so far into the tablelist */ 114 init_pointer_table((unsigned long)kernel_pg_dir); 115 for (i = 0; i < PTRS_PER_PGD; i++) { 116 if (pgd_present(kernel_pg_dir[i])) 117 init_pointer_table(__pgd_page(kernel_pg_dir[i])); 118 } 119 120 /* insert also pointer table that we used to unmap the zero page */ 121 if (zero_pgtable) 122 init_pointer_table((unsigned long)zero_pgtable); 123 #endif 124 125 printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n", 126 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), 127 max_mapnr << (PAGE_SHIFT-10), 128 codepages << (PAGE_SHIFT-10), 129 datapages << (PAGE_SHIFT-10), 130 initpages << (PAGE_SHIFT-10)); 131 } 132 133 #ifdef CONFIG_BLK_DEV_INITRD 134 void free_initrd_mem(unsigned long start, unsigned long end) 135 { 136 int pages = 0; 137 for (; start < end; start += PAGE_SIZE) { 138 ClearPageReserved(virt_to_page(start)); 139 init_page_count(virt_to_page(start)); 140 free_page(start); 141 totalram_pages++; 142 pages++; 143 } 144 printk ("Freeing initrd memory: %dk freed\n", pages); 145 } 146 #endif 147