target/linux/ar7-2.6/files/arch/mips/ar7/memory.c

   1 /*
   2  * $Id$
   3  *
   4  * Copyright (C) 2007 OpenWrt.org
   5  *
   6  * Based on arch/mips/mm/init.c
   7  * Copyright (C) 1994 - 2000 Ralf Baechle
   8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9  * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
  10  * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  25  */
  26 #include <linux/bootmem.h>
  27 #include <linux/init.h>
  28 #include <linux/mm.h>
  29 #include <linux/module.h>
  30 #include <linux/pfn.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/string.h>
  33 #include <linux/swap.h>
  34
  35 #include <asm/bootinfo.h>
  36 #include <asm/page.h>
  37 #include <asm/sections.h>
  38
  39 #include <asm/mips-boards/prom.h>
  40
  41 static int __init memsize(void)
  42 {
  43         u32 size = (64 << 20);
  44         volatile u32 *addr = (u32 *)KSEG1ADDR(0x14000000 + size - 4);
  45         u32 *kernel_end = (u32 *)KSEG1ADDR(CPHYSADDR((u32)&_end));
  46
  47         while (addr > kernel_end) {
  48                 *addr = (u32)addr;
  49                 size >>= 1;
  50                 addr -= size >> 2;
  51         }
  52
  53         do {
  54                 addr += size >> 2;
  55                 if (*addr != (u32)addr)
  56                         break;
  57                 size <<= 1;
  58         } while (size < (64 << 20));
  59
  60         return size;
  61 }
  62
  63 #ifdef CONFIG_NEED_MULTIPLE_NODES
  64 static bootmem_data_t node_bootmem_data;
  65 pg_data_t __node_data[1] = {
  66         {
  67                 .bdata = &node_bootmem_data
  68         },
  69 };
  70 EXPORT_SYMBOL(__node_data);
  71
  72 unsigned long max_mapnr;
  73 struct page *mem_map;
  74 EXPORT_SYMBOL(max_mapnr);
  75 EXPORT_SYMBOL(mem_map);
  76
  77 static unsigned long setup_zero_pages(void)
  78 {
  79         unsigned int order = 3;
  80         unsigned long size;
  81         struct page *page;
  82
  83         empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
  84         if (!empty_zero_page)
  85                 panic("Oh boy, that early out of memory?");
  86
  87         page = virt_to_page(empty_zero_page);
  88         split_page(page, order);
  89         while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) {
  90                 SetPageReserved(page);
  91                 page++;
  92         }
  93
  94         size = PAGE_SIZE << order;
  95         zero_page_mask = (size - 1) & PAGE_MASK;
  96
  97         return 1UL << order;
  98 }
  99
 100 extern void pagetable_init(void);
 101
 102 void __init paging_init(void)
 103 {
 104         unsigned long zones_size[MAX_NR_ZONES] = { 0, };
 105
 106         pagetable_init();
 107
 108         zones_size[ZONE_DMA] = max_low_pfn - min_low_pfn;
 109
 110         free_area_init_node(0, NODE_DATA(0), zones_size, ARCH_PFN_OFFSET, NULL);
 111 }
 112
 113 static struct kcore_list kcore_mem, kcore_vmalloc;
 114
 115 void __init mem_init(void)
 116 {
 117         unsigned long codesize, reservedpages, datasize, initsize;
 118         unsigned long tmp, ram;
 119         unsigned long kernel_start, kernel_end;
 120
 121         kernel_start = PFN_DOWN(CPHYSADDR((unsigned long)&_text));
 122         kernel_end = PFN_UP(CPHYSADDR((unsigned long)&_end));
 123         for (tmp = min_low_pfn + 1; tmp < kernel_start; tmp++) {
 124                 ClearPageReserved(pfn_to_page(tmp));
 125                 init_page_count(pfn_to_page(tmp));
 126                 free_page((unsigned long)__va(tmp << PAGE_SHIFT));
 127         }
 128
 129         totalram_pages += free_all_bootmem();
 130         totalram_pages -= setup_zero_pages();   /* Setup zeroed pages.  */
 131
 132         reservedpages = ram = 0;
 133         for (tmp = min_low_pfn; tmp <= max_low_pfn; tmp++) {
 134                 ram++;
 135                 if (PageReserved(pfn_to_page(tmp)))
 136                         if ((tmp < kernel_start) || (tmp > kernel_end))
 137                                 reservedpages++;
 138         }
 139         num_physpages = ram;
 140
 141         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 142         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 143         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 144
 145         kclist_add(&kcore_mem, __va(min_low_pfn),
 146                    (max_low_pfn - min_low_pfn) << PAGE_SHIFT);
 147         kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
 148                    VMALLOC_END - VMALLOC_START);
 149
 150         printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
 151                "%ldk reserved, %ldk data, %ldk init)\n",
 152                (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
 153                ram << (PAGE_SHIFT-10),
 154                codesize >> 10,
 155                reservedpages << (PAGE_SHIFT-10),
 156                datasize >> 10,
 157                initsize >> 10);
 158 }
 159 #endif
 160
 161 void __init prom_meminit(void)
 162 {
 163         unsigned long pages;
 164 #ifdef CONFIG_NEED_MULTIPLE_NODES
 165         unsigned long kernel_start, kernel_end;
 166         unsigned long free_pages;
 167         unsigned long bootmap_size;
 168 #endif
 169
 170         pages = memsize() >> PAGE_SHIFT;
 171         add_memory_region(ARCH_PFN_OFFSET << PAGE_SHIFT, pages <<
 172                           PAGE_SHIFT, BOOT_MEM_RAM);
 173
 174 #ifdef CONFIG_NEED_MULTIPLE_NODES
 175         kernel_start = PFN_DOWN(CPHYSADDR((unsigned long)&_text));
 176         kernel_end = PFN_UP(CPHYSADDR((unsigned long)&_end));
 177         min_low_pfn = ARCH_PFN_OFFSET;
 178         max_low_pfn = ARCH_PFN_OFFSET + pages;
 179         max_mapnr = max_low_pfn;
 180         free_pages = pages - (kernel_end - min_low_pfn);
 181         bootmap_size = init_bootmem_node(NODE_DATA(0), kernel_end,
 182                                          ARCH_PFN_OFFSET, max_low_pfn);
 183
 184         free_bootmem(PFN_PHYS(kernel_end), free_pages << PAGE_SHIFT);
 185         memory_present(0, min_low_pfn, max_low_pfn);
 186         reserve_bootmem(PFN_PHYS(kernel_end), bootmap_size);
 187         mem_map = NODE_DATA(0)->node_mem_map;
 188 #endif
 189 }
 190
 191 void __init prom_free_prom_memory(void)
 192 {
 193         return;
 194 }