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 " .text : 0x%08lx - 0x%08lx (%5lu kB)\n" 115 " .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n" 116 " .data : 0x%08lx - 0x%08lx (%5lu kB)\n" 117 " .init : 0x%08lx - 0x%08lx (%5lu kB)\n" 118 " .bss : 0x%08lx - 0x%08lx (%5lu kB)\n", 119 #ifdef CONFIG_KASAN 120 KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE, 121 KASAN_SHADOW_SIZE >> 20, 122 #endif 123 #ifdef CONFIG_MMU 124 VMALLOC_START, VMALLOC_END, 125 (VMALLOC_END - VMALLOC_START) >> 20, 126 #ifdef CONFIG_HIGHMEM 127 PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, 128 (LAST_PKMAP*PAGE_SIZE) >> 10, 129 FIXADDR_START, FIXADDR_TOP, 130 (FIXADDR_TOP - FIXADDR_START) >> 10, 131 #endif 132 PAGE_OFFSET, PAGE_OFFSET + 133 (max_low_pfn - min_low_pfn) * PAGE_SIZE, 134 #else 135 min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, 136 #endif 137 ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20, 138 (unsigned long)_text, (unsigned long)_etext, 139 (unsigned long)(_etext - _text) >> 10, 140 (unsigned long)__start_rodata, (unsigned long)_sdata, 141 (unsigned long)(_sdata - __start_rodata) >> 10, 142 (unsigned long)_sdata, (unsigned long)_edata, 143 (unsigned long)(_edata - _sdata) >> 10, 144 (unsigned long)__init_begin, (unsigned long)__init_end, 145 (unsigned long)(__init_end - __init_begin) >> 10, 146 (unsigned long)__bss_start, (unsigned long)__bss_stop, 147 (unsigned long)(__bss_stop - __bss_start) >> 10); 148 } 149 150 #ifdef CONFIG_BLK_DEV_INITRD 151 extern int initrd_is_mapped; 152 153 void free_initrd_mem(unsigned long start, unsigned long end) 154 { 155 if (initrd_is_mapped) 156 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 157 } 158 #endif 159 160 void free_initmem(void) 161 { 162 free_initmem_default(-1); 163 } 164 165 static void __init parse_memmap_one(char *p) 166 { 167 char *oldp; 168 unsigned long start_at, mem_size; 169 170 if (!p) 171 return; 172 173 oldp = p; 174 mem_size = memparse(p, &p); 175 if (p == oldp) 176 return; 177 178 switch (*p) { 179 case '@': 180 start_at = memparse(p + 1, &p); 181 memblock_add(start_at, mem_size); 182 break; 183 184 case '$': 185 start_at = memparse(p + 1, &p); 186 memblock_reserve(start_at, mem_size); 187 break; 188 189 case 0: 190 memblock_reserve(mem_size, -mem_size); 191 break; 192 193 default: 194 pr_warn("Unrecognized memmap syntax: %s\n", p); 195 break; 196 } 197 } 198 199 static int __init parse_memmap_opt(char *str) 200 { 201 while (str) { 202 char *k = strchr(str, ','); 203 204 if (k) 205 *k++ = 0; 206 207 parse_memmap_one(str); 208 str = k; 209 } 210 211 return 0; 212 } 213 early_param("memmap", parse_memmap_opt); 214