2005-06-24 07:01:24 +02:00
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/*
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* arch/xtensa/mm/init.c
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*
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* Derived from MIPS, PPC.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2005 Tensilica Inc.
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*
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* Chris Zankel <chris@zankel.net>
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* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
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* Marc Gauthier
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* Kevin Chea
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/bootmem.h>
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#include <linux/swap.h>
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2007-08-22 19:14:51 +02:00
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#include <linux/mman.h>
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#include <linux/nodemask.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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2005-06-24 07:01:24 +02:00
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#include <asm/bootparam.h>
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#include <asm/page.h>
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/* References to section boundaries */
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extern char _ftext, _etext, _fdata, _edata, _rodata_end;
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extern char __init_begin, __init_end;
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/*
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* mem_reserve(start, end, must_exist)
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*
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* Reserve some memory from the memory pool.
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*
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* Parameters:
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* start Start of region,
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* end End of region,
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* must_exist Must exist in memory pool.
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*
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* Returns:
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* 0 (memory area couldn't be mapped)
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* -1 (success)
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*/
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int __init mem_reserve(unsigned long start, unsigned long end, int must_exist)
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{
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int i;
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if (start == end)
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return 0;
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start = start & PAGE_MASK;
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end = PAGE_ALIGN(end);
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for (i = 0; i < sysmem.nr_banks; i++)
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if (start < sysmem.bank[i].end
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&& end >= sysmem.bank[i].start)
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break;
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if (i == sysmem.nr_banks) {
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if (must_exist)
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printk (KERN_WARNING "mem_reserve: [0x%0lx, 0x%0lx) "
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"not in any region!\n", start, end);
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return 0;
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}
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if (start > sysmem.bank[i].start) {
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if (end < sysmem.bank[i].end) {
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/* split entry */
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if (sysmem.nr_banks >= SYSMEM_BANKS_MAX)
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panic("meminfo overflow\n");
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sysmem.bank[sysmem.nr_banks].start = end;
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sysmem.bank[sysmem.nr_banks].end = sysmem.bank[i].end;
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sysmem.nr_banks++;
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}
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sysmem.bank[i].end = start;
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} else {
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if (end < sysmem.bank[i].end)
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sysmem.bank[i].start = end;
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else {
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/* remove entry */
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sysmem.nr_banks--;
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sysmem.bank[i].start = sysmem.bank[sysmem.nr_banks].start;
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sysmem.bank[i].end = sysmem.bank[sysmem.nr_banks].end;
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}
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}
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return -1;
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}
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/*
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* Initialize the bootmem system and give it all the memory we have available.
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*/
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void __init bootmem_init(void)
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{
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unsigned long pfn;
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unsigned long bootmap_start, bootmap_size;
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int i;
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max_low_pfn = max_pfn = 0;
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min_low_pfn = ~0;
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for (i=0; i < sysmem.nr_banks; i++) {
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pfn = PAGE_ALIGN(sysmem.bank[i].start) >> PAGE_SHIFT;
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if (pfn < min_low_pfn)
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min_low_pfn = pfn;
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pfn = PAGE_ALIGN(sysmem.bank[i].end - 1) >> PAGE_SHIFT;
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if (pfn > max_pfn)
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max_pfn = pfn;
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}
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if (min_low_pfn > max_pfn)
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panic("No memory found!\n");
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2006-12-10 11:18:48 +01:00
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max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ?
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max_pfn : MAX_MEM_PFN >> PAGE_SHIFT;
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2005-06-24 07:01:24 +02:00
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/* Find an area to use for the bootmem bitmap. */
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2009-03-04 16:21:29 +01:00
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bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn);
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bootmap_size <<= PAGE_SHIFT;
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2005-06-24 07:01:24 +02:00
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bootmap_start = ~0;
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for (i=0; i<sysmem.nr_banks; i++)
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if (sysmem.bank[i].end - sysmem.bank[i].start >= bootmap_size) {
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bootmap_start = sysmem.bank[i].start;
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break;
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}
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if (bootmap_start == ~0UL)
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panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
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/* Reserve the bootmem bitmap area */
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mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1);
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2009-03-04 16:21:29 +01:00
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bootmap_size = init_bootmem_node(NODE_DATA(0),
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2005-06-24 07:01:24 +02:00
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bootmap_start >> PAGE_SHIFT,
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2009-03-04 16:21:29 +01:00
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min_low_pfn,
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2005-06-24 07:01:24 +02:00
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max_low_pfn);
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/* Add all remaining memory pieces into the bootmem map */
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for (i=0; i<sysmem.nr_banks; i++)
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free_bootmem(sysmem.bank[i].start,
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sysmem.bank[i].end - sysmem.bank[i].start);
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}
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2009-03-04 16:21:31 +01:00
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void __init zones_init(void)
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2005-06-24 07:01:24 +02:00
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{
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unsigned long zones_size[MAX_NR_ZONES];
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int i;
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/* All pages are DMA-able, so we put them all in the DMA zone. */
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2009-03-04 16:21:30 +01:00
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zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET;
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2005-06-24 07:01:24 +02:00
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for (i = 1; i < MAX_NR_ZONES; i++)
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zones_size[i] = 0;
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#ifdef CONFIG_HIGHMEM
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zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn;
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#endif
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2009-03-04 16:21:30 +01:00
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free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
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2005-06-24 07:01:24 +02:00
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}
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/*
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* Initialize memory pages.
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*/
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void __init mem_init(void)
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{
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unsigned long codesize, reservedpages, datasize, initsize;
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unsigned long highmemsize, tmp, ram;
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2009-03-04 16:21:30 +01:00
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max_mapnr = num_physpages = max_low_pfn - ARCH_PFN_OFFSET;
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high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
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2005-06-24 07:01:24 +02:00
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highmemsize = 0;
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2005-09-23 06:44:23 +02:00
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#ifdef CONFIG_HIGHMEM
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2005-06-24 07:01:24 +02:00
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#error HIGHGMEM not implemented in init.c
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#endif
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totalram_pages += free_all_bootmem();
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reservedpages = ram = 0;
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2009-03-04 16:21:30 +01:00
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for (tmp = 0; tmp < max_mapnr; tmp++) {
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2005-06-24 07:01:24 +02:00
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ram++;
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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) &_ftext;
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datasize = (unsigned long) &_edata - (unsigned long) &_fdata;
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initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
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printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, "
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"%ldk data, %ldk init %ldk highmem)\n",
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2009-09-22 02:02:36 +02:00
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nr_free_pages() << (PAGE_SHIFT-10),
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2005-06-24 07:01:24 +02:00
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ram << (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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highmemsize >> 10);
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}
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void
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free_reserved_mem(void *start, void *end)
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{
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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2006-03-22 09:08:40 +01:00
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init_page_count(virt_to_page(start));
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2005-06-24 07:01:24 +02:00
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free_page((unsigned long)start);
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totalram_pages++;
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}
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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extern int initrd_is_mapped;
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (initrd_is_mapped) {
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free_reserved_mem((void*)start, (void*)end);
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printk ("Freeing initrd memory: %ldk freed\n",(end-start)>>10);
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}
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}
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#endif
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void free_initmem(void)
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{
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free_reserved_mem(&__init_begin, &__init_end);
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printk("Freeing unused kernel memory: %dk freed\n",
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(&__init_end - &__init_begin) >> 10);
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}
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