arch/xtensa/mm/init.c

   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
  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 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
  82 static 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
 113 void __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_END,
 151                 (FIXADDR_END - 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
 171 static 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
 205 static 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 }
 219 early_param("memmap", parse_memmap_opt);