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