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/initrd.h>
  29 #include <linux/mm.h>
  30 #include <linux/module.h>
  31 #include <linux/pfn.h>
  32 #include <linux/proc_fs.h>
  33 #include <linux/string.h>
  34 #include <linux/swap.h>
  35
  36 #include <asm/bootinfo.h>
  37 #include <asm/page.h>
  38 #include <asm/sections.h>
  39
  40 #include <asm/mips-boards/prom.h>
  41
  42 #warning FIXME: use sdram control regs and/or autodetection
  43 static int __init memsize(void)
  44 {
  45         char *memsize_str;
  46         unsigned int result;
  47         char cmdline[CL_SIZE], *ptr;
  48
  49         /* Check the command line first for a memsize directive */
  50         strcpy(cmdline, arcs_cmdline);
  51         ptr = strstr(cmdline, "memsize=");
  52         if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
  53                 ptr = strstr(ptr, " memsize=");
  54
  55         if (ptr) {
  56                 result = memparse(ptr + 8, &ptr);
  57         } else {
  58                 /* otherwise look in the environment */
  59                 memsize_str = prom_getenv("memsize");
  60                 if (!memsize_str) {
  61                         prom_printf("memsize not set in boot prom, set to default (8Mb)\n");
  62                         result = 0x00800000;
  63                 } else {
  64                         result = simple_strtol(memsize_str, NULL, 0);
  65                 }
  66         }
  67
  68         return result;
  69 }
  70
  71 extern unsigned long __initramfs_start, __initramfs_end;
  72
  73 #ifdef CONFIG_NEED_MULTIPLE_NODES
  74 static bootmem_data_t node_bootmem_data;
  75 pg_data_t __node_data[1] = {
  76         {
  77                 .bdata = &node_bootmem_data
  78         },
  79 };
  80 EXPORT_SYMBOL(__node_data);
  81
  82 unsigned long max_mapnr;
  83 struct page *mem_map;
  84 EXPORT_SYMBOL(max_mapnr);
  85 EXPORT_SYMBOL(mem_map);
  86
  87 static unsigned long setup_zero_pages(void)
  88 {
  89         unsigned int order = 3;
  90         unsigned long size;
  91         struct page *page;
  92
  93         empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
  94         if (!empty_zero_page)
  95                 panic("Oh boy, that early out of memory?");
  96
  97         page = virt_to_page(empty_zero_page);
  98         split_page(page, order);
  99         while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) {
 100                 SetPageReserved(page);
 101                 page++;
 102         }
 103
 104         size = PAGE_SIZE << order;
 105         zero_page_mask = (size - 1) & PAGE_MASK;
 106
 107         return 1UL << order;
 108 }
 109
 110 extern void pagetable_init(void);
 111
 112 void __init paging_init(void)
 113 {
 114         unsigned long zones_size[MAX_NR_ZONES] = { 0, };
 115
 116         pagetable_init();
 117
 118         zones_size[ZONE_DMA] = max_low_pfn - min_low_pfn;
 119
 120         free_area_init_node(0, NODE_DATA(0), zones_size, ARCH_PFN_OFFSET, NULL);
 121 }
 122
 123 static struct kcore_list kcore_mem, kcore_vmalloc;
 124
 125 void __init mem_init(void)
 126 {
 127         unsigned long codesize, reservedpages, datasize, initsize;
 128         unsigned long tmp, ram;
 129         unsigned long kernel_start, kernel_end;
 130
 131         kernel_start = PFN_DOWN(CPHYSADDR((unsigned long)&_text));
 132         kernel_end = PFN_UP(CPHYSADDR((unsigned long)&_end));
 133         for (tmp = min_low_pfn + 1; tmp < kernel_start; tmp++) {
 134                 ClearPageReserved(pfn_to_page(tmp));
 135                 init_page_count(pfn_to_page(tmp));
 136                 free_page((unsigned long)__va(tmp << PAGE_SHIFT));
 137         }
 138
 139         totalram_pages += free_all_bootmem();
 140         totalram_pages -= setup_zero_pages();   /* Setup zeroed pages.  */
 141
 142         reservedpages = ram = 0;
 143         for (tmp = min_low_pfn; tmp <= max_low_pfn; tmp++) {
 144                 ram++;
 145                 if (PageReserved(pfn_to_page(tmp)))
 146                         if ((tmp < kernel_start) || (tmp > kernel_end))
 147                                 reservedpages++;
 148         }
 149         num_physpages = ram;
 150
 151         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 152         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 153         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 154
 155         kclist_add(&kcore_mem, __va(min_low_pfn),
 156                    (max_low_pfn - min_low_pfn) << PAGE_SHIFT);
 157         kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
 158                    VMALLOC_END - VMALLOC_START);
 159
 160         printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
 161                "%ldk reserved, %ldk data, %ldk init)\n",
 162                (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
 163                ram << (PAGE_SHIFT-10),
 164                codesize >> 10,
 165                reservedpages << (PAGE_SHIFT-10),
 166                datasize >> 10,
 167                initsize >> 10);
 168 }
 169 #endif
 170
 171 void __init prom_meminit(void)
 172 {
 173 #ifdef CONFIG_NEED_MULTIPLE_NODES
 174         unsigned long kernel_start, kernel_end;
 175         unsigned long pages, free_pages;
 176         unsigned long bootmap_size;
 177 #endif
 178
 179 #ifdef CONFIG_BLK_DEV_INITRD
 180         initrd_start = (unsigned long)&__initramfs_start;
 181         initrd_end = (unsigned long)&__initramfs_end;
 182 #endif
 183
 184         pages = memsize() >> PAGE_SHIFT;
 185         add_memory_region(ARCH_PFN_OFFSET << PAGE_SHIFT, pages <<
 186                           PAGE_SHIFT, BOOT_MEM_RAM);
 187
 188 #ifdef CONFIG_NEED_MULTIPLE_NODES
 189         kernel_start = PFN_DOWN(CPHYSADDR((unsigned long)&_text));
 190         kernel_end = PFN_UP(CPHYSADDR((unsigned long)&_end));
 191         min_low_pfn = ARCH_PFN_OFFSET;
 192         max_low_pfn = ARCH_PFN_OFFSET + pages;
 193         max_mapnr = max_low_pfn;
 194         free_pages = pages - (kernel_end - min_low_pfn);
 195         bootmap_size = init_bootmem_node(NODE_DATA(0), kernel_end,
 196                                          ARCH_PFN_OFFSET, max_low_pfn);
 197
 198         free_bootmem(PFN_PHYS(kernel_end), free_pages << PAGE_SHIFT);
 199         memory_present(0, min_low_pfn, max_low_pfn);
 200         reserve_bootmem(PFN_PHYS(kernel_end), bootmap_size);
 201         mem_map = NODE_DATA(0)->node_mem_map;
 202 #endif
 203 }
 204
 205 unsigned long __init prom_free_prom_memory(void)
 206 {
 207 /*      return freed;
 208 */
 209         return 0;
 210 }