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/config.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 /* 36 * ZERO_PAGE is a special page that is used for zero-initialized 37 * data and COW. 38 */ 39 40 void *empty_zero_page; 41 42 void show_mem(void) 43 { 44 unsigned long i; 45 int free = 0, total = 0, reserved = 0, shared = 0; 46 int cached = 0; 47 48 printk("\nMem-info:\n"); 49 show_free_areas(); 50 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 51 i = max_mapnr; 52 while (i-- > 0) { 53 total++; 54 if (PageReserved(mem_map+i)) 55 reserved++; 56 else if (PageSwapCache(mem_map+i)) 57 cached++; 58 else if (!page_count(mem_map+i)) 59 free++; 60 else 61 shared += page_count(mem_map+i) - 1; 62 } 63 printk("%d pages of RAM\n",total); 64 printk("%d free pages\n",free); 65 printk("%d reserved pages\n",reserved); 66 printk("%d pages shared\n",shared); 67 printk("%d pages swap cached\n",cached); 68 } 69 70 extern void init_pointer_table(unsigned long ptable); 71 72 /* References to section boundaries */ 73 74 extern char _text, _etext, _edata, __bss_start, _end; 75 extern char __init_begin, __init_end; 76 77 extern pmd_t *zero_pgtable; 78 79 void __init mem_init(void) 80 { 81 int codepages = 0; 82 int datapages = 0; 83 int initpages = 0; 84 unsigned long tmp; 85 #ifndef CONFIG_SUN3 86 int i; 87 #endif 88 89 max_mapnr = num_physpages = (((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT); 90 91 #ifdef CONFIG_ATARI 92 if (MACH_IS_ATARI) 93 atari_stram_mem_init_hook(); 94 #endif 95 96 /* this will put all memory onto the freelists */ 97 totalram_pages = free_all_bootmem(); 98 99 for (tmp = PAGE_OFFSET ; tmp < (unsigned long)high_memory; tmp += PAGE_SIZE) { 100 if (PageReserved(virt_to_page(tmp))) { 101 if (tmp >= (unsigned long)&_text 102 && tmp < (unsigned long)&_etext) 103 codepages++; 104 else if (tmp >= (unsigned long) &__init_begin 105 && tmp < (unsigned long) &__init_end) 106 initpages++; 107 else 108 datapages++; 109 continue; 110 } 111 } 112 113 #ifndef CONFIG_SUN3 114 /* insert pointer tables allocated so far into the tablelist */ 115 init_pointer_table((unsigned long)kernel_pg_dir); 116 for (i = 0; i < PTRS_PER_PGD; i++) { 117 if (pgd_present(kernel_pg_dir[i])) 118 init_pointer_table(__pgd_page(kernel_pg_dir[i])); 119 } 120 121 /* insert also pointer table that we used to unmap the zero page */ 122 if (zero_pgtable) 123 init_pointer_table((unsigned long)zero_pgtable); 124 #endif 125 126 printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n", 127 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), 128 max_mapnr << (PAGE_SHIFT-10), 129 codepages << (PAGE_SHIFT-10), 130 datapages << (PAGE_SHIFT-10), 131 initpages << (PAGE_SHIFT-10)); 132 } 133 134 #ifdef CONFIG_BLK_DEV_INITRD 135 void free_initrd_mem(unsigned long start, unsigned long end) 136 { 137 int pages = 0; 138 for (; start < end; start += PAGE_SIZE) { 139 ClearPageReserved(virt_to_page(start)); 140 set_page_count(virt_to_page(start), 1); 141 free_page(start); 142 totalram_pages++; 143 pages++; 144 } 145 printk ("Freeing initrd memory: %dk freed\n", pages); 146 } 147 #endif 148