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_KASAN 104 " kasan : 0x%08lx - 0x%08lx (%5lu MB)\n" 105 #endif 106 #ifdef CONFIG_MMU 107 " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n" 108 #endif 109 #ifdef CONFIG_HIGHMEM 110 " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 111 " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 112 #endif 113 " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n", 114 #ifdef CONFIG_KASAN 115 KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE, 116 KASAN_SHADOW_SIZE >> 20, 117 #endif 118 #ifdef CONFIG_MMU 119 VMALLOC_START, VMALLOC_END, 120 (VMALLOC_END - VMALLOC_START) >> 20, 121 #ifdef CONFIG_HIGHMEM 122 PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, 123 (LAST_PKMAP*PAGE_SIZE) >> 10, 124 FIXADDR_START, FIXADDR_TOP, 125 (FIXADDR_TOP - FIXADDR_START) >> 10, 126 #endif 127 PAGE_OFFSET, PAGE_OFFSET + 128 (max_low_pfn - min_low_pfn) * PAGE_SIZE, 129 #else 130 min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, 131 #endif 132 ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20); 133 } 134 135 #ifdef CONFIG_BLK_DEV_INITRD 136 extern int initrd_is_mapped; 137 138 void free_initrd_mem(unsigned long start, unsigned long end) 139 { 140 if (initrd_is_mapped) 141 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 142 } 143 #endif 144 145 void free_initmem(void) 146 { 147 free_initmem_default(-1); 148 } 149 150 static void __init parse_memmap_one(char *p) 151 { 152 char *oldp; 153 unsigned long start_at, mem_size; 154 155 if (!p) 156 return; 157 158 oldp = p; 159 mem_size = memparse(p, &p); 160 if (p == oldp) 161 return; 162 163 switch (*p) { 164 case '@': 165 start_at = memparse(p + 1, &p); 166 memblock_add(start_at, mem_size); 167 break; 168 169 case '$': 170 start_at = memparse(p + 1, &p); 171 memblock_reserve(start_at, mem_size); 172 break; 173 174 case 0: 175 memblock_reserve(mem_size, -mem_size); 176 break; 177 178 default: 179 pr_warn("Unrecognized memmap syntax: %s\n", p); 180 break; 181 } 182 } 183 184 static int __init parse_memmap_opt(char *str) 185 { 186 while (str) { 187 char *k = strchr(str, ','); 188 189 if (k) 190 *k++ = 0; 191 192 parse_memmap_one(str); 193 str = k; 194 } 195 196 return 0; 197 } 198 early_param("memmap", parse_memmap_opt); 199