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-map-ops.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 40void __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 memblock_reserve(0, PHYS_OFFSET ? PHYS_OFFSET : 1); 49 50 early_init_fdt_scan_reserved_mem(); 51 52 if (!memblock_phys_mem_size()) 53 panic("No memory found!\n"); 54 55 min_low_pfn = PFN_UP(memblock_start_of_DRAM()); 56 min_low_pfn = max(min_low_pfn, PFN_UP(PHYS_OFFSET)); 57 max_pfn = PFN_DOWN(memblock_end_of_DRAM()); 58 max_low_pfn = min(max_pfn, MAX_LOW_PFN); 59 60 early_memtest((phys_addr_t)min_low_pfn << PAGE_SHIFT, 61 (phys_addr_t)max_low_pfn << PAGE_SHIFT); 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 70void __init zones_init(void) 71{ 72 /* All pages are DMA-able, so we put them all in the DMA zone. */ 73 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 74 [ZONE_NORMAL] = max_low_pfn, 75#ifdef CONFIG_HIGHMEM 76 [ZONE_HIGHMEM] = max_pfn, 77#endif 78 }; 79 free_area_init(max_zone_pfn); 80} 81 82static void __init free_highpages(void) 83{ 84#ifdef CONFIG_HIGHMEM 85 unsigned long max_low = max_low_pfn; 86 phys_addr_t range_start, range_end; 87 u64 i; 88 89 /* set highmem page free */ 90 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, 91 &range_start, &range_end, NULL) { 92 unsigned long start = PFN_UP(range_start); 93 unsigned long end = PFN_DOWN(range_end); 94 95 /* Ignore complete lowmem entries */ 96 if (end <= max_low) 97 continue; 98 99 /* Truncate partial highmem entries */ 100 if (start < max_low) 101 start = max_low; 102 103 for (; start < end; start++) 104 free_highmem_page(pfn_to_page(start)); 105 } 106#endif 107} 108 109/* 110 * Initialize memory pages. 111 */ 112 113void __init mem_init(void) 114{ 115 free_highpages(); 116 117 max_mapnr = max_pfn - ARCH_PFN_OFFSET; 118 high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT); 119 120 memblock_free_all(); 121 122 mem_init_print_info(NULL); 123 pr_info("virtual kernel memory layout:\n" 124#ifdef CONFIG_KASAN 125 " kasan : 0x%08lx - 0x%08lx (%5lu MB)\n" 126#endif 127#ifdef CONFIG_MMU 128 " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n" 129#endif 130#ifdef CONFIG_HIGHMEM 131 " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 132 " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 133#endif 134 " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n" 135 " .text : 0x%08lx - 0x%08lx (%5lu kB)\n" 136 " .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n" 137 " .data : 0x%08lx - 0x%08lx (%5lu kB)\n" 138 " .init : 0x%08lx - 0x%08lx (%5lu kB)\n" 139 " .bss : 0x%08lx - 0x%08lx (%5lu kB)\n", 140#ifdef CONFIG_KASAN 141 KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE, 142 KASAN_SHADOW_SIZE >> 20, 143#endif 144#ifdef CONFIG_MMU 145 VMALLOC_START, VMALLOC_END, 146 (VMALLOC_END - VMALLOC_START) >> 20, 147#ifdef CONFIG_HIGHMEM 148 PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, 149 (LAST_PKMAP*PAGE_SIZE) >> 10, 150 FIXADDR_START, FIXADDR_TOP, 151 (FIXADDR_TOP - FIXADDR_START) >> 10, 152#endif 153 PAGE_OFFSET, PAGE_OFFSET + 154 (max_low_pfn - min_low_pfn) * PAGE_SIZE, 155#else 156 min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, 157#endif 158 ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20, 159 (unsigned long)_text, (unsigned long)_etext, 160 (unsigned long)(_etext - _text) >> 10, 161 (unsigned long)__start_rodata, (unsigned long)__end_rodata, 162 (unsigned long)(__end_rodata - __start_rodata) >> 10, 163 (unsigned long)_sdata, (unsigned long)_edata, 164 (unsigned long)(_edata - _sdata) >> 10, 165 (unsigned long)__init_begin, (unsigned long)__init_end, 166 (unsigned long)(__init_end - __init_begin) >> 10, 167 (unsigned long)__bss_start, (unsigned long)__bss_stop, 168 (unsigned long)(__bss_stop - __bss_start) >> 10); 169} 170 171static void __init parse_memmap_one(char *p) 172{ 173 char *oldp; 174 unsigned long start_at, mem_size; 175 176 if (!p) 177 return; 178 179 oldp = p; 180 mem_size = memparse(p, &p); 181 if (p == oldp) 182 return; 183 184 switch (*p) { 185 case '@': 186 start_at = memparse(p + 1, &p); 187 memblock_add(start_at, mem_size); 188 break; 189 190 case '$': 191 start_at = memparse(p + 1, &p); 192 memblock_reserve(start_at, mem_size); 193 break; 194 195 case 0: 196 memblock_reserve(mem_size, -mem_size); 197 break; 198 199 default: 200 pr_warn("Unrecognized memmap syntax: %s\n", p); 201 break; 202 } 203} 204 205static int __init parse_memmap_opt(char *str) 206{ 207 while (str) { 208 char *k = strchr(str, ','); 209 210 if (k) 211 *k++ = 0; 212 213 parse_memmap_one(str); 214 str = k; 215 } 216 217 return 0; 218} 219early_param("memmap", parse_memmap_opt); 220