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/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);