413 lines
8.7 KiB
C
413 lines
8.7 KiB
C
/*
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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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* Copyright (C) 2014 Cadence Design Systems 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/gfp.h>
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#include <linux/highmem.h>
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#include <linux/swap.h>
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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 <asm/bootparam.h>
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#include <asm/page.h>
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#include <asm/sections.h>
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#include <asm/sysmem.h>
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struct sysmem_info sysmem __initdata;
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static void __init sysmem_dump(void)
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{
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unsigned i;
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pr_debug("Sysmem:\n");
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for (i = 0; i < sysmem.nr_banks; ++i)
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pr_debug(" 0x%08lx - 0x%08lx (%ldK)\n",
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sysmem.bank[i].start, sysmem.bank[i].end,
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(sysmem.bank[i].end - sysmem.bank[i].start) >> 10);
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}
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/*
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* Find bank with maximal .start such that bank.start <= start
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*/
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static inline struct meminfo * __init find_bank(unsigned long start)
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{
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unsigned i;
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struct meminfo *it = NULL;
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for (i = 0; i < sysmem.nr_banks; ++i)
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if (sysmem.bank[i].start <= start)
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it = sysmem.bank + i;
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else
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break;
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return it;
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}
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/*
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* Move all memory banks starting at 'from' to a new place at 'to',
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* adjust nr_banks accordingly.
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* Both 'from' and 'to' must be inside the sysmem.bank.
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*
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* Returns: 0 (success), -ENOMEM (not enough space in the sysmem.bank).
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*/
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static int __init move_banks(struct meminfo *to, struct meminfo *from)
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{
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unsigned n = sysmem.nr_banks - (from - sysmem.bank);
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if (to > from && to - from + sysmem.nr_banks > SYSMEM_BANKS_MAX)
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return -ENOMEM;
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if (to != from)
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memmove(to, from, n * sizeof(struct meminfo));
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sysmem.nr_banks += to - from;
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return 0;
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}
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/*
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* Add new bank to sysmem. Resulting sysmem is the union of bytes of the
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* original sysmem and the new bank.
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*
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* Returns: 0 (success), < 0 (error)
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*/
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int __init add_sysmem_bank(unsigned long start, unsigned long end)
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{
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unsigned i;
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struct meminfo *it = NULL;
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unsigned long sz;
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unsigned long bank_sz = 0;
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if (start == end ||
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(start < end) != (PAGE_ALIGN(start) < (end & PAGE_MASK))) {
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pr_warn("Ignoring small memory bank 0x%08lx size: %ld bytes\n",
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start, end - start);
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return -EINVAL;
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}
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start = PAGE_ALIGN(start);
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end &= PAGE_MASK;
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sz = end - start;
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it = find_bank(start);
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if (it)
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bank_sz = it->end - it->start;
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if (it && bank_sz >= start - it->start) {
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if (end - it->start > bank_sz)
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it->end = end;
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else
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return 0;
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} else {
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if (!it)
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it = sysmem.bank;
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else
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++it;
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if (it - sysmem.bank < sysmem.nr_banks &&
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it->start - start <= sz) {
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it->start = start;
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if (it->end - it->start < sz)
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it->end = end;
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else
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return 0;
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} else {
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if (move_banks(it + 1, it) < 0) {
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pr_warn("Ignoring memory bank 0x%08lx size %ld bytes\n",
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start, end - start);
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return -EINVAL;
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}
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it->start = start;
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it->end = end;
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return 0;
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}
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}
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sz = it->end - it->start;
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for (i = it + 1 - sysmem.bank; i < sysmem.nr_banks; ++i)
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if (sysmem.bank[i].start - it->start <= sz) {
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if (sz < sysmem.bank[i].end - it->start)
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it->end = sysmem.bank[i].end;
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} else {
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break;
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}
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move_banks(it + 1, sysmem.bank + i);
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return 0;
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}
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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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* If must_exist is set and a part of the region being reserved does not exist
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* memory map is not altered.
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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 (success)
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* < 0 (error)
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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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struct meminfo *it;
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struct meminfo *rm = NULL;
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unsigned long sz;
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unsigned long bank_sz = 0;
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start = start & PAGE_MASK;
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end = PAGE_ALIGN(end);
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sz = end - start;
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if (!sz)
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return -EINVAL;
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it = find_bank(start);
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if (it)
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bank_sz = it->end - it->start;
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if ((!it || end - it->start > bank_sz) && must_exist) {
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pr_warn("mem_reserve: [0x%0lx, 0x%0lx) not in any region!\n",
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start, end);
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return -EINVAL;
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}
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if (it && start - it->start <= bank_sz) {
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if (start == it->start) {
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if (end - it->start < bank_sz) {
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it->start = end;
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return 0;
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} else {
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rm = it;
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}
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} else {
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it->end = start;
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if (end - it->start < bank_sz)
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return add_sysmem_bank(end,
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it->start + bank_sz);
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++it;
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}
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}
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if (!it)
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it = sysmem.bank;
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for (; it < sysmem.bank + sysmem.nr_banks; ++it) {
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if (it->end - start <= sz) {
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if (!rm)
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rm = it;
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} else {
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if (it->start - start < sz)
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it->start = end;
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break;
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}
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}
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if (rm)
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move_banks(rm, it);
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return 0;
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}
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/*
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* Initialize the bootmem system and give it all low 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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sysmem_dump();
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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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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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/* Find an area to use for the bootmem bitmap. */
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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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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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bootmap_size = init_bootmem_node(NODE_DATA(0),
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bootmap_start >> PAGE_SHIFT,
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min_low_pfn,
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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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if (sysmem.bank[i].start >> PAGE_SHIFT < max_low_pfn) {
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unsigned long end = min(max_low_pfn << PAGE_SHIFT,
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sysmem.bank[i].end);
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free_bootmem(sysmem.bank[i].start,
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end - sysmem.bank[i].start);
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}
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}
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}
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void __init zones_init(void)
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{
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/* All pages are DMA-able, so we put them all in the DMA zone. */
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unsigned long zones_size[MAX_NR_ZONES] = {
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[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET,
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#ifdef CONFIG_HIGHMEM
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[ZONE_HIGHMEM] = max_pfn - max_low_pfn,
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#endif
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};
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free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
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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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#ifdef CONFIG_HIGHMEM
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unsigned long tmp;
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reset_all_zones_managed_pages();
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for (tmp = max_low_pfn; tmp < max_pfn; tmp++)
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free_highmem_page(pfn_to_page(tmp));
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#endif
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max_mapnr = max_pfn - ARCH_PFN_OFFSET;
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high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT);
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free_all_bootmem();
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mem_init_print_info(NULL);
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pr_info("virtual kernel memory layout:\n"
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#ifdef CONFIG_HIGHMEM
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" pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
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" fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
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#endif
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" vmalloc : 0x%08x - 0x%08x (%5u MB)\n"
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" lowmem : 0x%08x - 0x%08lx (%5lu MB)\n",
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#ifdef CONFIG_HIGHMEM
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PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
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(LAST_PKMAP*PAGE_SIZE) >> 10,
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FIXADDR_START, FIXADDR_TOP,
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(FIXADDR_TOP - FIXADDR_START) >> 10,
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#endif
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VMALLOC_START, VMALLOC_END,
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(VMALLOC_END - VMALLOC_START) >> 20,
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PAGE_OFFSET, PAGE_OFFSET +
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(max_low_pfn - min_low_pfn) * PAGE_SIZE,
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((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20);
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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_area((void *)start, (void *)end, -1, "initrd");
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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_initmem_default(-1);
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}
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static void __init parse_memmap_one(char *p)
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{
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char *oldp;
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unsigned long start_at, mem_size;
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if (!p)
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return;
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oldp = p;
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mem_size = memparse(p, &p);
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if (p == oldp)
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return;
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switch (*p) {
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case '@':
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start_at = memparse(p + 1, &p);
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add_sysmem_bank(start_at, start_at + mem_size);
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break;
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case '$':
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start_at = memparse(p + 1, &p);
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mem_reserve(start_at, start_at + mem_size, 0);
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break;
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case 0:
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mem_reserve(mem_size, 0, 0);
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break;
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default:
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pr_warn("Unrecognized memmap syntax: %s\n", p);
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break;
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}
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}
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static int __init parse_memmap_opt(char *str)
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{
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while (str) {
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char *k = strchr(str, ',');
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if (k)
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*k++ = 0;
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parse_memmap_one(str);
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str = k;
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}
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return 0;
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}
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early_param("memmap", parse_memmap_opt);
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