1 /* 2 * arch/xtensa/mm/init.c 3 * 4 * Derived from MIPS, PPC. 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 * 10 * Copyright (C) 2001 - 2005 Tensilica Inc. 11 * Copyright (C) 2014 - 2016 Cadence Design Systems Inc. 12 * 13 * Chris Zankel <chris@zankel.net> 14 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> 15 * Marc Gauthier 16 * Kevin Chea 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/errno.h> 21 #include <linux/bootmem.h> 22 #include <linux/gfp.h> 23 #include <linux/highmem.h> 24 #include <linux/swap.h> 25 #include <linux/mman.h> 26 #include <linux/nodemask.h> 27 #include <linux/mm.h> 28 #include <linux/of_fdt.h> 29 #include <linux/dma-contiguous.h> 30 31 #include <asm/bootparam.h> 32 #include <asm/page.h> 33 #include <asm/sections.h> 34 #include <asm/sysmem.h> 35 36 /* 37 * Initialize the bootmem system and give it all low memory we have available. 38 */ 39 40 void __init bootmem_init(void) 41 { 42 /* Reserve all memory below PHYS_OFFSET, as memory 43 * accounting doesn't work for pages below that address. 44 * 45 * If PHYS_OFFSET is zero reserve page at address 0: 46 * successfull allocations should never return NULL. 47 */ 48 if (PHYS_OFFSET) 49 memblock_reserve(0, PHYS_OFFSET); 50 else 51 memblock_reserve(0, 1); 52 53 early_init_fdt_scan_reserved_mem(); 54 55 if (!memblock_phys_mem_size()) 56 panic("No memory found!\n"); 57 58 min_low_pfn = PFN_UP(memblock_start_of_DRAM()); 59 min_low_pfn = max(min_low_pfn, PFN_UP(PHYS_OFFSET)); 60 max_pfn = PFN_DOWN(memblock_end_of_DRAM()); 61 max_low_pfn = min(max_pfn, MAX_LOW_PFN); 62 63 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 64 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 65 66 memblock_dump_all(); 67 } 68 69 70 void __init zones_init(void) 71 { 72 /* All pages are DMA-able, so we put them all in the DMA zone. */ 73 unsigned long zones_size[MAX_NR_ZONES] = { 74 [ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET, 75 #ifdef CONFIG_HIGHMEM 76 [ZONE_HIGHMEM] = max_pfn - max_low_pfn, 77 #endif 78 }; 79 free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL); 80 } 81 82 /* 83 * Initialize memory pages. 84 */ 85 86 void __init mem_init(void) 87 { 88 #ifdef CONFIG_HIGHMEM 89 unsigned long tmp; 90 91 reset_all_zones_managed_pages(); 92 for (tmp = max_low_pfn; tmp < max_pfn; tmp++) 93 free_highmem_page(pfn_to_page(tmp)); 94 #endif 95 96 max_mapnr = max_pfn - ARCH_PFN_OFFSET; 97 high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT); 98 99 free_all_bootmem(); 100 101 mem_init_print_info(NULL); 102 pr_info("virtual kernel memory layout:\n" 103 #ifdef CONFIG_HIGHMEM 104 " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 105 " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 106 #endif 107 #ifdef CONFIG_MMU 108 " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n" 109 #endif 110 " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n", 111 #ifdef CONFIG_HIGHMEM 112 PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, 113 (LAST_PKMAP*PAGE_SIZE) >> 10, 114 FIXADDR_START, FIXADDR_TOP, 115 (FIXADDR_TOP - FIXADDR_START) >> 10, 116 #endif 117 #ifdef CONFIG_MMU 118 VMALLOC_START, VMALLOC_END, 119 (VMALLOC_END - VMALLOC_START) >> 20, 120 PAGE_OFFSET, PAGE_OFFSET + 121 (max_low_pfn - min_low_pfn) * PAGE_SIZE, 122 #else 123 min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, 124 #endif 125 ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20); 126 } 127 128 #ifdef CONFIG_BLK_DEV_INITRD 129 extern int initrd_is_mapped; 130 131 void free_initrd_mem(unsigned long start, unsigned long end) 132 { 133 if (initrd_is_mapped) 134 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 135 } 136 #endif 137 138 void free_initmem(void) 139 { 140 free_initmem_default(-1); 141 } 142 143 static void __init parse_memmap_one(char *p) 144 { 145 char *oldp; 146 unsigned long start_at, mem_size; 147 148 if (!p) 149 return; 150 151 oldp = p; 152 mem_size = memparse(p, &p); 153 if (p == oldp) 154 return; 155 156 switch (*p) { 157 case '@': 158 start_at = memparse(p + 1, &p); 159 memblock_add(start_at, mem_size); 160 break; 161 162 case '$': 163 start_at = memparse(p + 1, &p); 164 memblock_reserve(start_at, mem_size); 165 break; 166 167 case 0: 168 memblock_reserve(mem_size, -mem_size); 169 break; 170 171 default: 172 pr_warn("Unrecognized memmap syntax: %s\n", p); 173 break; 174 } 175 } 176 177 static int __init parse_memmap_opt(char *str) 178 { 179 while (str) { 180 char *k = strchr(str, ','); 181 182 if (k) 183 *k++ = 0; 184 185 parse_memmap_one(str); 186 str = k; 187 } 188 189 return 0; 190 } 191 early_param("memmap", parse_memmap_opt); 192