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 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 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 static void __init print_vm_layout(void) 70 { 71 pr_info("virtual kernel memory layout:\n" 72 #ifdef CONFIG_KASAN 73 " kasan : 0x%08lx - 0x%08lx (%5lu MB)\n" 74 #endif 75 #ifdef CONFIG_MMU 76 " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n" 77 #endif 78 #ifdef CONFIG_HIGHMEM 79 " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 80 " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 81 #endif 82 " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n" 83 " .text : 0x%08lx - 0x%08lx (%5lu kB)\n" 84 " .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n" 85 " .data : 0x%08lx - 0x%08lx (%5lu kB)\n" 86 " .init : 0x%08lx - 0x%08lx (%5lu kB)\n" 87 " .bss : 0x%08lx - 0x%08lx (%5lu kB)\n", 88 #ifdef CONFIG_KASAN 89 KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE, 90 KASAN_SHADOW_SIZE >> 20, 91 #endif 92 #ifdef CONFIG_MMU 93 VMALLOC_START, VMALLOC_END, 94 (VMALLOC_END - VMALLOC_START) >> 20, 95 #ifdef CONFIG_HIGHMEM 96 PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, 97 (LAST_PKMAP*PAGE_SIZE) >> 10, 98 FIXADDR_START, FIXADDR_END, 99 (FIXADDR_END - FIXADDR_START) >> 10, 100 #endif 101 PAGE_OFFSET, PAGE_OFFSET + 102 (max_low_pfn - min_low_pfn) * PAGE_SIZE, 103 #else 104 min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, 105 #endif 106 ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20, 107 (unsigned long)_text, (unsigned long)_etext, 108 (unsigned long)(_etext - _text) >> 10, 109 (unsigned long)__start_rodata, (unsigned long)__end_rodata, 110 (unsigned long)(__end_rodata - __start_rodata) >> 10, 111 (unsigned long)_sdata, (unsigned long)_edata, 112 (unsigned long)(_edata - _sdata) >> 10, 113 (unsigned long)__init_begin, (unsigned long)__init_end, 114 (unsigned long)(__init_end - __init_begin) >> 10, 115 (unsigned long)__bss_start, (unsigned long)__bss_stop, 116 (unsigned long)(__bss_stop - __bss_start) >> 10); 117 } 118 119 void __init zones_init(void) 120 { 121 /* All pages are DMA-able, so we put them all in the DMA zone. */ 122 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 123 [ZONE_NORMAL] = max_low_pfn, 124 #ifdef CONFIG_HIGHMEM 125 [ZONE_HIGHMEM] = max_pfn, 126 #endif 127 }; 128 free_area_init(max_zone_pfn); 129 print_vm_layout(); 130 } 131 132 static void __init parse_memmap_one(char *p) 133 { 134 char *oldp; 135 unsigned long start_at, mem_size; 136 137 if (!p) 138 return; 139 140 oldp = p; 141 mem_size = memparse(p, &p); 142 if (p == oldp) 143 return; 144 145 switch (*p) { 146 case '@': 147 start_at = memparse(p + 1, &p); 148 memblock_add(start_at, mem_size); 149 break; 150 151 case '$': 152 start_at = memparse(p + 1, &p); 153 memblock_reserve(start_at, mem_size); 154 break; 155 156 case 0: 157 memblock_reserve(mem_size, -mem_size); 158 break; 159 160 default: 161 pr_warn("Unrecognized memmap syntax: %s\n", p); 162 break; 163 } 164 } 165 166 static int __init parse_memmap_opt(char *str) 167 { 168 while (str) { 169 char *k = strchr(str, ','); 170 171 if (k) 172 *k++ = 0; 173 174 parse_memmap_one(str); 175 str = k; 176 } 177 178 return 0; 179 } 180 early_param("memmap", parse_memmap_opt); 181 182 #ifdef CONFIG_MMU 183 static const pgprot_t protection_map[16] = { 184 [VM_NONE] = PAGE_NONE, 185 [VM_READ] = PAGE_READONLY, 186 [VM_WRITE] = PAGE_COPY, 187 [VM_WRITE | VM_READ] = PAGE_COPY, 188 [VM_EXEC] = PAGE_READONLY_EXEC, 189 [VM_EXEC | VM_READ] = PAGE_READONLY_EXEC, 190 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC, 191 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC, 192 [VM_SHARED] = PAGE_NONE, 193 [VM_SHARED | VM_READ] = PAGE_READONLY, 194 [VM_SHARED | VM_WRITE] = PAGE_SHARED, 195 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, 196 [VM_SHARED | VM_EXEC] = PAGE_READONLY_EXEC, 197 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_EXEC, 198 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC, 199 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC 200 }; 201 DECLARE_VM_GET_PAGE_PROT 202 #endif 203