linux/arch/xtensa/mm/init.c
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   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
  40void __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
  70void __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
  82static 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
 113void __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        pr_info("virtual kernel memory layout:\n"
 123#ifdef CONFIG_KASAN
 124                "    kasan   : 0x%08lx - 0x%08lx  (%5lu MB)\n"
 125#endif
 126#ifdef CONFIG_MMU
 127                "    vmalloc : 0x%08lx - 0x%08lx  (%5lu MB)\n"
 128#endif
 129#ifdef CONFIG_HIGHMEM
 130                "    pkmap   : 0x%08lx - 0x%08lx  (%5lu kB)\n"
 131                "    fixmap  : 0x%08lx - 0x%08lx  (%5lu kB)\n"
 132#endif
 133                "    lowmem  : 0x%08lx - 0x%08lx  (%5lu MB)\n"
 134                "    .text   : 0x%08lx - 0x%08lx  (%5lu kB)\n"
 135                "    .rodata : 0x%08lx - 0x%08lx  (%5lu kB)\n"
 136                "    .data   : 0x%08lx - 0x%08lx  (%5lu kB)\n"
 137                "    .init   : 0x%08lx - 0x%08lx  (%5lu kB)\n"
 138                "    .bss    : 0x%08lx - 0x%08lx  (%5lu kB)\n",
 139#ifdef CONFIG_KASAN
 140                KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE,
 141                KASAN_SHADOW_SIZE >> 20,
 142#endif
 143#ifdef CONFIG_MMU
 144                VMALLOC_START, VMALLOC_END,
 145                (VMALLOC_END - VMALLOC_START) >> 20,
 146#ifdef CONFIG_HIGHMEM
 147                PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
 148                (LAST_PKMAP*PAGE_SIZE) >> 10,
 149                FIXADDR_START, FIXADDR_END,
 150                (FIXADDR_END - FIXADDR_START) >> 10,
 151#endif
 152                PAGE_OFFSET, PAGE_OFFSET +
 153                (max_low_pfn - min_low_pfn) * PAGE_SIZE,
 154#else
 155                min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE,
 156#endif
 157                ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20,
 158                (unsigned long)_text, (unsigned long)_etext,
 159                (unsigned long)(_etext - _text) >> 10,
 160                (unsigned long)__start_rodata, (unsigned long)__end_rodata,
 161                (unsigned long)(__end_rodata - __start_rodata) >> 10,
 162                (unsigned long)_sdata, (unsigned long)_edata,
 163                (unsigned long)(_edata - _sdata) >> 10,
 164                (unsigned long)__init_begin, (unsigned long)__init_end,
 165                (unsigned long)(__init_end - __init_begin) >> 10,
 166                (unsigned long)__bss_start, (unsigned long)__bss_stop,
 167                (unsigned long)(__bss_stop - __bss_start) >> 10);
 168}
 169
 170static void __init parse_memmap_one(char *p)
 171{
 172        char *oldp;
 173        unsigned long start_at, mem_size;
 174
 175        if (!p)
 176                return;
 177
 178        oldp = p;
 179        mem_size = memparse(p, &p);
 180        if (p == oldp)
 181                return;
 182
 183        switch (*p) {
 184        case '@':
 185                start_at = memparse(p + 1, &p);
 186                memblock_add(start_at, mem_size);
 187                break;
 188
 189        case '$':
 190                start_at = memparse(p + 1, &p);
 191                memblock_reserve(start_at, mem_size);
 192                break;
 193
 194        case 0:
 195                memblock_reserve(mem_size, -mem_size);
 196                break;
 197
 198        default:
 199                pr_warn("Unrecognized memmap syntax: %s\n", p);
 200                break;
 201        }
 202}
 203
 204static int __init parse_memmap_opt(char *str)
 205{
 206        while (str) {
 207                char *k = strchr(str, ',');
 208
 209                if (k)
 210                        *k++ = 0;
 211
 212                parse_memmap_one(str);
 213                str = k;
 214        }
 215
 216        return 0;
 217}
 218early_param("memmap", parse_memmap_opt);
 219
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