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Linux/arch/frv/mm/init.c

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  1 /* init.c: memory initialisation for FRV
  2  *
  3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  *
 11  * Derived from:
 12  *  - linux/arch/m68knommu/mm/init.c
 13  *    - Copyright (C) 1998  D. Jeff Dionne <jeff@lineo.ca>, Kenneth Albanowski <kjahds@kjahds.com>,
 14  *    - Copyright (C) 2000  Lineo, Inc.  (www.lineo.com)
 15  *  - linux/arch/m68k/mm/init.c
 16  *    - Copyright (C) 1995  Hamish Macdonald
 17  */
 18 
 19 #include <linux/signal.h>
 20 #include <linux/sched.h>
 21 #include <linux/pagemap.h>
 22 #include <linux/gfp.h>
 23 #include <linux/swap.h>
 24 #include <linux/mm.h>
 25 #include <linux/kernel.h>
 26 #include <linux/string.h>
 27 #include <linux/types.h>
 28 #include <linux/bootmem.h>
 29 #include <linux/highmem.h>
 30 #include <linux/module.h>
 31 
 32 #include <asm/setup.h>
 33 #include <asm/segment.h>
 34 #include <asm/page.h>
 35 #include <asm/pgtable.h>
 36 #include <asm/mmu_context.h>
 37 #include <asm/virtconvert.h>
 38 #include <asm/sections.h>
 39 #include <asm/tlb.h>
 40 
 41 #undef DEBUG
 42 
 43 /*
 44  * BAD_PAGE is the page that is used for page faults when linux
 45  * is out-of-memory. Older versions of linux just did a
 46  * do_exit(), but using this instead means there is less risk
 47  * for a process dying in kernel mode, possibly leaving a inode
 48  * unused etc..
 49  *
 50  * BAD_PAGETABLE is the accompanying page-table: it is initialized
 51  * to point to BAD_PAGE entries.
 52  *
 53  * ZERO_PAGE is a special page that is used for zero-initialized
 54  * data and COW.
 55  */
 56 static unsigned long empty_bad_page_table;
 57 static unsigned long empty_bad_page;
 58 
 59 unsigned long empty_zero_page;
 60 EXPORT_SYMBOL(empty_zero_page);
 61 
 62 /*****************************************************************************/
 63 /*
 64  * paging_init() continues the virtual memory environment setup which
 65  * was begun by the code in arch/head.S.
 66  * The parameters are pointers to where to stick the starting and ending
 67  * addresses  of available kernel virtual memory.
 68  */
 69 void __init paging_init(void)
 70 {
 71         unsigned long zones_size[MAX_NR_ZONES] = {0, };
 72 
 73         /* allocate some pages for kernel housekeeping tasks */
 74         empty_bad_page_table    = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
 75         empty_bad_page          = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
 76         empty_zero_page         = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
 77 
 78         memset((void *) empty_zero_page, 0, PAGE_SIZE);
 79 
 80 #ifdef CONFIG_HIGHMEM
 81         if (get_num_physpages() - num_mappedpages) {
 82                 pgd_t *pge;
 83                 pud_t *pue;
 84                 pmd_t *pme;
 85 
 86                 pkmap_page_table = alloc_bootmem_pages(PAGE_SIZE);
 87 
 88                 pge = swapper_pg_dir + pgd_index_k(PKMAP_BASE);
 89                 pue = pud_offset(pge, PKMAP_BASE);
 90                 pme = pmd_offset(pue, PKMAP_BASE);
 91                 __set_pmd(pme, virt_to_phys(pkmap_page_table) | _PAGE_TABLE);
 92         }
 93 #endif
 94 
 95         /* distribute the allocatable pages across the various zones and pass them to the allocator
 96          */
 97         zones_size[ZONE_NORMAL]  = max_low_pfn - min_low_pfn;
 98 #ifdef CONFIG_HIGHMEM
 99         zones_size[ZONE_HIGHMEM] = get_num_physpages() - num_mappedpages;
100 #endif
101 
102         free_area_init(zones_size);
103 
104 #ifdef CONFIG_MMU
105         /* initialise init's MMU context */
106         init_new_context(&init_task, &init_mm);
107 #endif
108 
109 } /* end paging_init() */
110 
111 /*****************************************************************************/
112 /*
113  *
114  */
115 void __init mem_init(void)
116 {
117         unsigned long code_size = _etext - _stext;
118 
119         /* this will put all low memory onto the freelists */
120         free_all_bootmem();
121 #if defined(CONFIG_MMU) && defined(CONFIG_HIGHMEM)
122         {
123                 unsigned long pfn;
124 
125                 for (pfn = get_num_physpages() - 1;
126                      pfn >= num_mappedpages; pfn--)
127                         free_highmem_page(&mem_map[pfn]);
128         }
129 #endif
130 
131         mem_init_print_info(NULL);
132         if (rom_length > 0 && rom_length >= code_size)
133                 printk("Memory available:  %luKiB/%luKiB ROM\n",
134                         (rom_length - code_size) >> 10, rom_length >> 10);
135 } /* end mem_init() */
136 
137 /*****************************************************************************/
138 /*
139  * free the memory that was only required for initialisation
140  */
141 void free_initmem(void)
142 {
143 #if defined(CONFIG_RAMKERNEL) && !defined(CONFIG_PROTECT_KERNEL)
144         free_initmem_default(-1);
145 #endif
146 } /* end free_initmem() */
147 
148 /*****************************************************************************/
149 /*
150  * free the initial ramdisk memory
151  */
152 #ifdef CONFIG_BLK_DEV_INITRD
153 void __init free_initrd_mem(unsigned long start, unsigned long end)
154 {
155         free_reserved_area((void *)start, (void *)end, -1, "initrd");
156 } /* end free_initrd_mem() */
157 #endif
158 

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