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 #ifdef CONFIG_ZONE_DMA32 32 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G, max_low_pfn)); 33 #endif 34 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 35 36 free_area_init_nodes(max_zone_pfns); 37 } 38 39 void setup_zero_page(void) 40 { 41 memset((void *)empty_zero_page, 0, PAGE_SIZE); 42 } 43 44 void __init paging_init(void) 45 { 46 setup_zero_page(); 47 local_flush_tlb_all(); 48 zone_sizes_init(); 49 } 50 51 void __init mem_init(void) 52 { 53 #ifdef CONFIG_FLATMEM 54 BUG_ON(!mem_map); 55 #endif /* CONFIG_FLATMEM */ 56 57 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 58 free_all_bootmem(); 59 60 mem_init_print_info(NULL); 61 } 62 63 void free_initmem(void) 64 { 65 free_initmem_default(0); 66 } 67 68 #ifdef CONFIG_BLK_DEV_INITRD 69 void free_initrd_mem(unsigned long start, unsigned long end) 70 { 71 } 72 #endif /* CONFIG_BLK_DEV_INITRD */ 73