mirror of https://gitee.com/openkylin/linux.git
226 lines
6.6 KiB
C
226 lines
6.6 KiB
C
/*
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* linux/arch/cris/mm/init.c
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*
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* Copyright (C) 1995 Linus Torvalds
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* Copyright (C) 2000,2001 Axis Communications AB
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*
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* Authors: Bjorn Wesen (bjornw@axis.com)
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*
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* $Log: init.c,v $
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* Revision 1.11 2004/05/28 09:28:56 starvik
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* Calculation of loops_per_usec moved because initalization order has changed
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* in Linux 2.6.
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*
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* Revision 1.10 2004/05/14 07:58:05 starvik
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* Merge of changes from 2.4
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*
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* Revision 1.9 2003/07/04 08:27:54 starvik
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* Merge of Linux 2.5.74
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*
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* Revision 1.8 2003/04/09 05:20:48 starvik
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* Merge of Linux 2.5.67
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*
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* Revision 1.7 2003/01/22 06:48:38 starvik
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* Fixed warnings issued by GCC 3.2.1
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*
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* Revision 1.6 2002/12/11 14:44:48 starvik
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* Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/mm
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*
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* Revision 1.5 2002/11/18 07:37:37 starvik
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* Added cache bug workaround (from Linux 2.4)
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*
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* Revision 1.4 2002/11/13 15:40:24 starvik
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* Removed the page table cache stuff (as done in other archs)
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*
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* Revision 1.3 2002/11/05 06:45:13 starvik
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* Merge of Linux 2.5.45
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*
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* Revision 1.2 2001/12/18 13:35:22 bjornw
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* Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15).
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*
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* Revision 1.31 2001/11/13 16:22:00 bjornw
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* Skip calculating totalram and sharedram in si_meminfo
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*
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* Revision 1.30 2001/11/12 19:02:10 pkj
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* Fixed compiler warnings.
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*
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* Revision 1.29 2001/07/25 16:09:50 bjornw
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* val->sharedram will stay 0
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*
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* Revision 1.28 2001/06/28 16:30:17 bjornw
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* Oops. This needs to wait until 2.4.6 is merged
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*
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* Revision 1.27 2001/06/28 14:04:07 bjornw
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* Fill in sharedram
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*
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* Revision 1.26 2001/06/18 06:36:02 hp
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* Enable free_initmem of __init-type pages
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*
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* Revision 1.25 2001/06/13 00:02:23 bjornw
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* Use a separate variable to store the current pgd to avoid races in schedule
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*
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* Revision 1.24 2001/05/15 00:52:20 hp
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* Only map segment 0xa as seg if CONFIG_JULIETTE
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*
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* Revision 1.23 2001/04/04 14:35:40 bjornw
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* * Removed get_pte_slow and friends (2.4.3 change)
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* * Removed bad_pmd handling (2.4.3 change)
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*
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* Revision 1.22 2001/04/04 13:38:04 matsfg
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* Moved ioremap to a separate function instead
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*
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* Revision 1.21 2001/03/27 09:28:33 bjornw
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* ioremap used too early - lets try it in mem_init instead
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*
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* Revision 1.20 2001/03/23 07:39:21 starvik
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* Corrected according to review remarks
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*
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* Revision 1.19 2001/03/15 14:25:17 bjornw
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* More general shadow registers and ioremaped addresses for external I/O
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*
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* Revision 1.18 2001/02/23 12:46:44 bjornw
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* * 0xc was not CSE1; 0x8 is, same as uncached flash, so we move the uncached
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* flash during CRIS_LOW_MAP from 0xe to 0x8 so both the flash and the I/O
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* is mapped straight over (for !CRIS_LOW_MAP the uncached flash is still 0xe)
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*
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* Revision 1.17 2001/02/22 15:05:21 bjornw
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* Map 0x9 straight over during LOW_MAP to allow for memory mapped LEDs
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*
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* Revision 1.16 2001/02/22 15:02:35 bjornw
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* Map 0xc straight over during LOW_MAP to allow for memory mapped I/O
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*
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* Revision 1.15 2001/01/10 21:12:10 bjornw
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* loops_per_sec -> loops_per_jiffy
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*
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* Revision 1.14 2000/11/22 16:23:20 bjornw
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* Initialize totalhigh counters to 0 to make /proc/meminfo look nice.
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*
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* Revision 1.13 2000/11/21 16:37:51 bjornw
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* Temporarily disable initmem freeing
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*
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* Revision 1.12 2000/11/21 13:55:07 bjornw
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* Use CONFIG_CRIS_LOW_MAP for the low VM map instead of explicit CPU type
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*
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* Revision 1.11 2000/10/06 12:38:22 bjornw
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* Cast empty_bad_page correctly (should really be of * type from the start..
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*
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* Revision 1.10 2000/10/04 16:53:57 bjornw
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* Fix memory-map due to LX features
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*
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* Revision 1.9 2000/09/13 15:47:49 bjornw
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* Wrong count in reserved-pages loop
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*
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* Revision 1.8 2000/09/13 14:35:10 bjornw
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* 2.4.0-test8 added a new arg to free_area_init_node
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*
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* Revision 1.7 2000/08/17 15:35:55 bjornw
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* 2.4.0-test6 removed MAP_NR and inserted virt_to_page
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*
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*
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*/
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <asm/tlb.h>
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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unsigned long empty_zero_page;
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extern char _stext, _edata, _etext; /* From linkerscript */
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extern char __init_begin, __init_end;
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void
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show_mem(void)
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{
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int i,free = 0,total = 0,cached = 0, reserved = 0, nonshared = 0;
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int shared = 0;
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printk("\nMem-info:\n");
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show_free_areas();
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printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
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i = max_mapnr;
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while (i-- > 0) {
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total++;
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if (PageReserved(mem_map+i))
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reserved++;
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else if (PageSwapCache(mem_map+i))
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cached++;
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else if (!page_count(mem_map+i))
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free++;
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else if (page_count(mem_map+i) == 1)
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nonshared++;
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else
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shared += page_count(mem_map+i) - 1;
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}
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printk("%d pages of RAM\n",total);
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printk("%d free pages\n",free);
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printk("%d reserved pages\n",reserved);
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printk("%d pages nonshared\n",nonshared);
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printk("%d pages shared\n",shared);
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printk("%d pages swap cached\n",cached);
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}
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void __init
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mem_init(void)
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{
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int codesize, reservedpages, datasize, initsize;
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unsigned long tmp;
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if(!mem_map)
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BUG();
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/* max/min_low_pfn was set by setup.c
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* now we just copy it to some other necessary places...
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*
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* high_memory was also set in setup.c
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*/
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max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
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/* this will put all memory onto the freelists */
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totalram_pages = free_all_bootmem();
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reservedpages = 0;
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for (tmp = 0; tmp < max_mapnr; tmp++) {
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/*
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* Only count reserved RAM pages
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*/
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if (PageReserved(mem_map + tmp))
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reservedpages++;
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}
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codesize = (unsigned long) &_etext - (unsigned long) &_stext;
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datasize = (unsigned long) &_edata - (unsigned long) &_etext;
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initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
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printk(KERN_INFO
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"Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, "
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"%dk init)\n" ,
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(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
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max_mapnr << (PAGE_SHIFT-10),
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codesize >> 10,
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reservedpages << (PAGE_SHIFT-10),
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datasize >> 10,
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initsize >> 10
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);
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}
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/* free the pages occupied by initialization code */
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void
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free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long)(&__init_begin);
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for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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set_page_count(virt_to_page(addr), 1);
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free_page(addr);
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totalram_pages++;
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}
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printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n",
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(unsigned long)((&__init_end - &__init_begin) >> 10));
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}
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