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/memblock.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 early_memtest((phys_addr_t)min_low_pfn << PAGE_SHIFT, 64 (phys_addr_t)max_low_pfn << PAGE_SHIFT); 65 66 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 67 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 68 69 memblock_dump_all(); 70 } 71 72 73 void __init zones_init(void) 74 { 75 /* All pages are DMA-able, so we put them all in the DMA zone. */ 76 unsigned long zones_size[MAX_NR_ZONES] = { 77 [ZONE_NORMAL] = max_low_pfn - ARCH_PFN_OFFSET, 78 #ifdef CONFIG_HIGHMEM 79 [ZONE_HIGHMEM] = max_pfn - max_low_pfn, 80 #endif 81 }; 82 free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL); 83 } 84 85 #ifdef CONFIG_HIGHMEM 86 static void __init free_area_high(unsigned long pfn, unsigned long end) 87 { 88 for (; pfn < end; pfn++) 89 free_highmem_page(pfn_to_page(pfn)); 90 } 91 92 static void __init free_highpages(void) 93 { 94 unsigned long max_low = max_low_pfn; 95 struct memblock_region *mem, *res; 96 97 reset_all_zones_managed_pages(); 98 /* set highmem page free */ 99 for_each_memblock(memory, mem) { 100 unsigned long start = memblock_region_memory_base_pfn(mem); 101 unsigned long end = memblock_region_memory_end_pfn(mem); 102 103 /* Ignore complete lowmem entries */ 104 if (end <= max_low) 105 continue; 106 107 if (memblock_is_nomap(mem)) 108 continue; 109 110 /* Truncate partial highmem entries */ 111 if (start < max_low) 112 start = max_low; 113 114 /* Find and exclude any reserved regions */ 115 for_each_memblock(reserved, res) { 116 unsigned long res_start, res_end; 117 118 res_start = memblock_region_reserved_base_pfn(res); 119 res_end = memblock_region_reserved_end_pfn(res); 120 121 if (res_end < start) 122 continue; 123 if (res_start < start) 124 res_start = start; 125 if (res_start > end) 126 res_start = end; 127 if (res_end > end) 128 res_end = end; 129 if (res_start != start) 130 free_area_high(start, res_start); 131 start = res_end; 132 if (start == end) 133 break; 134 } 135 136 /* And now free anything which remains */ 137 if (start < end) 138 free_area_high(start, end); 139 } 140 } 141 #else 142 static void __init free_highpages(void) 143 { 144 } 145 #endif 146 147 /* 148 * Initialize memory pages. 149 */ 150 151 void __init mem_init(void) 152 { 153 free_highpages(); 154 155 max_mapnr = max_pfn - ARCH_PFN_OFFSET; 156 high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT); 157 158 memblock_free_all(); 159 160 mem_init_print_info(NULL); 161 pr_info("virtual kernel memory layout:\n" 162 #ifdef CONFIG_KASAN 163 " kasan : 0x%08lx - 0x%08lx (%5lu MB)\n" 164 #endif 165 #ifdef CONFIG_MMU 166 " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n" 167 #endif 168 #ifdef CONFIG_HIGHMEM 169 " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 170 " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 171 #endif 172 " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n" 173 " .text : 0x%08lx - 0x%08lx (%5lu kB)\n" 174 " .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n" 175 " .data : 0x%08lx - 0x%08lx (%5lu kB)\n" 176 " .init : 0x%08lx - 0x%08lx (%5lu kB)\n" 177 " .bss : 0x%08lx - 0x%08lx (%5lu kB)\n", 178 #ifdef CONFIG_KASAN 179 KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE, 180 KASAN_SHADOW_SIZE >> 20, 181 #endif 182 #ifdef CONFIG_MMU 183 VMALLOC_START, VMALLOC_END, 184 (VMALLOC_END - VMALLOC_START) >> 20, 185 #ifdef CONFIG_HIGHMEM 186 PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, 187 (LAST_PKMAP*PAGE_SIZE) >> 10, 188 FIXADDR_START, FIXADDR_TOP, 189 (FIXADDR_TOP - FIXADDR_START) >> 10, 190 #endif 191 PAGE_OFFSET, PAGE_OFFSET + 192 (max_low_pfn - min_low_pfn) * PAGE_SIZE, 193 #else 194 min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, 195 #endif 196 ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20, 197 (unsigned long)_text, (unsigned long)_etext, 198 (unsigned long)(_etext - _text) >> 10, 199 (unsigned long)__start_rodata, (unsigned long)_sdata, 200 (unsigned long)(_sdata - __start_rodata) >> 10, 201 (unsigned long)_sdata, (unsigned long)_edata, 202 (unsigned long)(_edata - _sdata) >> 10, 203 (unsigned long)__init_begin, (unsigned long)__init_end, 204 (unsigned long)(__init_end - __init_begin) >> 10, 205 (unsigned long)__bss_start, (unsigned long)__bss_stop, 206 (unsigned long)(__bss_stop - __bss_start) >> 10); 207 } 208 209 #ifdef CONFIG_BLK_DEV_INITRD 210 extern int initrd_is_mapped; 211 212 void free_initrd_mem(unsigned long start, unsigned long end) 213 { 214 if (initrd_is_mapped) 215 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 216 } 217 #endif 218 219 void free_initmem(void) 220 { 221 free_initmem_default(-1); 222 } 223 224 static void __init parse_memmap_one(char *p) 225 { 226 char *oldp; 227 unsigned long start_at, mem_size; 228 229 if (!p) 230 return; 231 232 oldp = p; 233 mem_size = memparse(p, &p); 234 if (p == oldp) 235 return; 236 237 switch (*p) { 238 case '@': 239 start_at = memparse(p + 1, &p); 240 memblock_add(start_at, mem_size); 241 break; 242 243 case '$': 244 start_at = memparse(p + 1, &p); 245 memblock_reserve(start_at, mem_size); 246 break; 247 248 case 0: 249 memblock_reserve(mem_size, -mem_size); 250 break; 251 252 default: 253 pr_warn("Unrecognized memmap syntax: %s\n", p); 254 break; 255 } 256 } 257 258 static int __init parse_memmap_opt(char *str) 259 { 260 while (str) { 261 char *k = strchr(str, ','); 262 263 if (k) 264 *k++ = 0; 265 266 parse_memmap_one(str); 267 str = k; 268 } 269 270 return 0; 271 } 272 early_param("memmap", parse_memmap_opt); 273