1 /* 2 * Copyright (C) 2012 Regents of the University of California 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation, version 2. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/init.h> 15 #include <linux/mm.h> 16 #include <linux/bootmem.h> 17 #include <linux/initrd.h> 18 #include <linux/memblock.h> 19 #include <linux/swap.h> 20 #include <linux/sizes.h> 21 22 #include <asm/tlbflush.h> 23 #include <asm/sections.h> 24 #include <asm/pgtable.h> 25 #include <asm/io.h> 26 27 static void __init zone_sizes_init(void) 28 { 29 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; 30 31 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G, max_low_pfn)); 32 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 33 34 free_area_init_nodes(max_zone_pfns); 35 } 36 37 void setup_zero_page(void) 38 { 39 memset((void *)empty_zero_page, 0, PAGE_SIZE); 40 } 41 42 void __init paging_init(void) 43 { 44 setup_zero_page(); 45 local_flush_tlb_all(); 46 zone_sizes_init(); 47 } 48 49 void __init mem_init(void) 50 { 51 #ifdef CONFIG_FLATMEM 52 BUG_ON(!mem_map); 53 #endif /* CONFIG_FLATMEM */ 54 55 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 56 free_all_bootmem(); 57 58 mem_init_print_info(NULL); 59 } 60 61 void free_initmem(void) 62 { 63 free_initmem_default(0); 64 } 65 66 #ifdef CONFIG_BLK_DEV_INITRD 67 void free_initrd_mem(unsigned long start, unsigned long end) 68 { 69 } 70 #endif /* CONFIG_BLK_DEV_INITRD */ 71