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 #ifdef CONFIG_HIGHMEM 83 static void __init free_area_high(unsigned long pfn, unsigned long end) 84 { 85 for (; pfn < end; pfn++) 86 free_highmem_page(pfn_to_page(pfn)); 87 } 88 89 static void __init free_highpages(void) 90 { 91 unsigned long max_low = max_low_pfn; 92 struct memblock_region *mem, *res; 93 94 reset_all_zones_managed_pages(); 95 /* set highmem page free */ 96 for_each_memblock(memory, mem) { 97 unsigned long start = memblock_region_memory_base_pfn(mem); 98 unsigned long end = memblock_region_memory_end_pfn(mem); 99 100 /* Ignore complete lowmem entries */ 101 if (end <= max_low) 102 continue; 103 104 if (memblock_is_nomap(mem)) 105 continue; 106 107 /* Truncate partial highmem entries */ 108 if (start < max_low) 109 start = max_low; 110 111 /* Find and exclude any reserved regions */ 112 for_each_memblock(reserved, res) { 113 unsigned long res_start, res_end; 114 115 res_start = memblock_region_reserved_base_pfn(res); 116 res_end = memblock_region_reserved_end_pfn(res); 117 118 if (res_end < start) 119 continue; 120 if (res_start < start) 121 res_start = start; 122 if (res_start > end) 123 res_start = end; 124 if (res_end > end) 125 res_end = end; 126 if (res_start != start) 127 free_area_high(start, res_start); 128 start = res_end; 129 if (start == end) 130 break; 131 } 132 133 /* And now free anything which remains */ 134 if (start < end) 135 free_area_high(start, end); 136 } 137 } 138 #else 139 static void __init free_highpages(void) 140 { 141 } 142 #endif 143 144 /* 145 * Initialize memory pages. 146 */ 147 148 void __init mem_init(void) 149 { 150 free_highpages(); 151 152 max_mapnr = max_pfn - ARCH_PFN_OFFSET; 153 high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT); 154 155 free_all_bootmem(); 156 157 mem_init_print_info(NULL); 158 pr_info("virtual kernel memory layout:\n" 159 #ifdef CONFIG_KASAN 160 " kasan : 0x%08lx - 0x%08lx (%5lu MB)\n" 161 #endif 162 #ifdef CONFIG_MMU 163 " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n" 164 #endif 165 #ifdef CONFIG_HIGHMEM 166 " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 167 " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 168 #endif 169 " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n" 170 " .text : 0x%08lx - 0x%08lx (%5lu kB)\n" 171 " .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n" 172 " .data : 0x%08lx - 0x%08lx (%5lu kB)\n" 173 " .init : 0x%08lx - 0x%08lx (%5lu kB)\n" 174 " .bss : 0x%08lx - 0x%08lx (%5lu kB)\n", 175 #ifdef CONFIG_KASAN 176 KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE, 177 KASAN_SHADOW_SIZE >> 20, 178 #endif 179 #ifdef CONFIG_MMU 180 VMALLOC_START, VMALLOC_END, 181 (VMALLOC_END - VMALLOC_START) >> 20, 182 #ifdef CONFIG_HIGHMEM 183 PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, 184 (LAST_PKMAP*PAGE_SIZE) >> 10, 185 FIXADDR_START, FIXADDR_TOP, 186 (FIXADDR_TOP - FIXADDR_START) >> 10, 187 #endif 188 PAGE_OFFSET, PAGE_OFFSET + 189 (max_low_pfn - min_low_pfn) * PAGE_SIZE, 190 #else 191 min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, 192 #endif 193 ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20, 194 (unsigned long)_text, (unsigned long)_etext, 195 (unsigned long)(_etext - _text) >> 10, 196 (unsigned long)__start_rodata, (unsigned long)_sdata, 197 (unsigned long)(_sdata - __start_rodata) >> 10, 198 (unsigned long)_sdata, (unsigned long)_edata, 199 (unsigned long)(_edata - _sdata) >> 10, 200 (unsigned long)__init_begin, (unsigned long)__init_end, 201 (unsigned long)(__init_end - __init_begin) >> 10, 202 (unsigned long)__bss_start, (unsigned long)__bss_stop, 203 (unsigned long)(__bss_stop - __bss_start) >> 10); 204 } 205 206 #ifdef CONFIG_BLK_DEV_INITRD 207 extern int initrd_is_mapped; 208 209 void free_initrd_mem(unsigned long start, unsigned long end) 210 { 211 if (initrd_is_mapped) 212 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 213 } 214 #endif 215 216 void free_initmem(void) 217 { 218 free_initmem_default(-1); 219 } 220 221 static void __init parse_memmap_one(char *p) 222 { 223 char *oldp; 224 unsigned long start_at, mem_size; 225 226 if (!p) 227 return; 228 229 oldp = p; 230 mem_size = memparse(p, &p); 231 if (p == oldp) 232 return; 233 234 switch (*p) { 235 case '@': 236 start_at = memparse(p + 1, &p); 237 memblock_add(start_at, mem_size); 238 break; 239 240 case '$': 241 start_at = memparse(p + 1, &p); 242 memblock_reserve(start_at, mem_size); 243 break; 244 245 case 0: 246 memblock_reserve(mem_size, -mem_size); 247 break; 248 249 default: 250 pr_warn("Unrecognized memmap syntax: %s\n", p); 251 break; 252 } 253 } 254 255 static int __init parse_memmap_opt(char *str) 256 { 257 while (str) { 258 char *k = strchr(str, ','); 259 260 if (k) 261 *k++ = 0; 262 263 parse_memmap_one(str); 264 str = k; 265 } 266 267 return 0; 268 } 269 early_param("memmap", parse_memmap_opt); 270