304 lines
7.1 KiB
C
304 lines
7.1 KiB
C
/*
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* Procedures for maintaining information about logical memory blocks.
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*
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* Peter Bergner, IBM Corp. June 2001.
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* Copyright (C) 2001 Peter Bergner.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <asm/types.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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#include <asm/lmb.h>
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#ifdef CONFIG_PPC32
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#include "mmu_decl.h" /* for __max_low_memory */
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#endif
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#undef DEBUG
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#ifdef DEBUG
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#include <asm/udbg.h>
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#define DBG(fmt...) udbg_printf(fmt)
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#else
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#define DBG(fmt...)
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#endif
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struct lmb lmb;
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void lmb_dump_all(void)
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{
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#ifdef DEBUG
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unsigned long i;
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DBG("lmb_dump_all:\n");
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DBG(" memory.cnt = 0x%lx\n", lmb.memory.cnt);
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DBG(" memory.size = 0x%lx\n", lmb.memory.size);
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for (i=0; i < lmb.memory.cnt ;i++) {
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DBG(" memory.region[0x%x].base = 0x%lx\n",
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i, lmb.memory.region[i].base);
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DBG(" .size = 0x%lx\n",
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lmb.memory.region[i].size);
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}
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DBG("\n reserved.cnt = 0x%lx\n", lmb.reserved.cnt);
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DBG(" reserved.size = 0x%lx\n", lmb.reserved.size);
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for (i=0; i < lmb.reserved.cnt ;i++) {
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DBG(" reserved.region[0x%x].base = 0x%lx\n",
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i, lmb.reserved.region[i].base);
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DBG(" .size = 0x%lx\n",
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lmb.reserved.region[i].size);
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}
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#endif /* DEBUG */
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}
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static unsigned long __init lmb_addrs_overlap(unsigned long base1,
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unsigned long size1, unsigned long base2, unsigned long size2)
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{
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return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
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}
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static long __init lmb_addrs_adjacent(unsigned long base1, unsigned long size1,
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unsigned long base2, unsigned long size2)
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{
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if (base2 == base1 + size1)
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return 1;
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else if (base1 == base2 + size2)
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return -1;
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return 0;
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}
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static long __init lmb_regions_adjacent(struct lmb_region *rgn,
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unsigned long r1, unsigned long r2)
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{
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unsigned long base1 = rgn->region[r1].base;
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unsigned long size1 = rgn->region[r1].size;
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unsigned long base2 = rgn->region[r2].base;
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unsigned long size2 = rgn->region[r2].size;
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return lmb_addrs_adjacent(base1, size1, base2, size2);
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}
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/* Assumption: base addr of region 1 < base addr of region 2 */
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static void __init lmb_coalesce_regions(struct lmb_region *rgn,
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unsigned long r1, unsigned long r2)
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{
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unsigned long i;
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rgn->region[r1].size += rgn->region[r2].size;
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for (i=r2; i < rgn->cnt-1; i++) {
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rgn->region[i].base = rgn->region[i+1].base;
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rgn->region[i].size = rgn->region[i+1].size;
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}
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rgn->cnt--;
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}
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/* This routine called with relocation disabled. */
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void __init lmb_init(void)
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{
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/* Create a dummy zero size LMB which will get coalesced away later.
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* This simplifies the lmb_add() code below...
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*/
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lmb.memory.region[0].base = 0;
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lmb.memory.region[0].size = 0;
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lmb.memory.cnt = 1;
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/* Ditto. */
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lmb.reserved.region[0].base = 0;
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lmb.reserved.region[0].size = 0;
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lmb.reserved.cnt = 1;
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}
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/* This routine may be called with relocation disabled. */
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void __init lmb_analyze(void)
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{
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int i;
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lmb.memory.size = 0;
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for (i = 0; i < lmb.memory.cnt; i++)
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lmb.memory.size += lmb.memory.region[i].size;
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}
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/* This routine called with relocation disabled. */
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static long __init lmb_add_region(struct lmb_region *rgn, unsigned long base,
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unsigned long size)
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{
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unsigned long i, coalesced = 0;
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long adjacent;
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/* First try and coalesce this LMB with another. */
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for (i=0; i < rgn->cnt; i++) {
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unsigned long rgnbase = rgn->region[i].base;
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unsigned long rgnsize = rgn->region[i].size;
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adjacent = lmb_addrs_adjacent(base,size,rgnbase,rgnsize);
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if ( adjacent > 0 ) {
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rgn->region[i].base -= size;
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rgn->region[i].size += size;
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coalesced++;
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break;
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}
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else if ( adjacent < 0 ) {
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rgn->region[i].size += size;
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coalesced++;
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break;
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}
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}
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if ((i < rgn->cnt-1) && lmb_regions_adjacent(rgn, i, i+1) ) {
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lmb_coalesce_regions(rgn, i, i+1);
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coalesced++;
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}
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if (coalesced)
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return coalesced;
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if (rgn->cnt >= MAX_LMB_REGIONS)
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return -1;
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/* Couldn't coalesce the LMB, so add it to the sorted table. */
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for (i = rgn->cnt-1; i >= 0; i--) {
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if (base < rgn->region[i].base) {
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rgn->region[i+1].base = rgn->region[i].base;
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rgn->region[i+1].size = rgn->region[i].size;
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} else {
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rgn->region[i+1].base = base;
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rgn->region[i+1].size = size;
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break;
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}
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}
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rgn->cnt++;
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return 0;
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}
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/* This routine may be called with relocation disabled. */
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long __init lmb_add(unsigned long base, unsigned long size)
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{
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struct lmb_region *_rgn = &(lmb.memory);
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/* On pSeries LPAR systems, the first LMB is our RMO region. */
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if (base == 0)
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lmb.rmo_size = size;
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return lmb_add_region(_rgn, base, size);
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}
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long __init lmb_reserve(unsigned long base, unsigned long size)
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{
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struct lmb_region *_rgn = &(lmb.reserved);
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BUG_ON(0 == size);
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return lmb_add_region(_rgn, base, size);
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}
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long __init lmb_overlaps_region(struct lmb_region *rgn, unsigned long base,
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unsigned long size)
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{
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unsigned long i;
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for (i=0; i < rgn->cnt; i++) {
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unsigned long rgnbase = rgn->region[i].base;
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unsigned long rgnsize = rgn->region[i].size;
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if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) {
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break;
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}
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}
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return (i < rgn->cnt) ? i : -1;
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}
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unsigned long __init lmb_alloc(unsigned long size, unsigned long align)
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{
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return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE);
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}
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unsigned long __init lmb_alloc_base(unsigned long size, unsigned long align,
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unsigned long max_addr)
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{
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long i, j;
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unsigned long base = 0;
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BUG_ON(0 == size);
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#ifdef CONFIG_PPC32
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/* On 32-bit, make sure we allocate lowmem */
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if (max_addr == LMB_ALLOC_ANYWHERE)
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max_addr = __max_low_memory;
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#endif
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for (i = lmb.memory.cnt-1; i >= 0; i--) {
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unsigned long lmbbase = lmb.memory.region[i].base;
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unsigned long lmbsize = lmb.memory.region[i].size;
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if (max_addr == LMB_ALLOC_ANYWHERE)
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base = _ALIGN_DOWN(lmbbase + lmbsize - size, align);
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else if (lmbbase < max_addr) {
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base = min(lmbbase + lmbsize, max_addr);
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base = _ALIGN_DOWN(base - size, align);
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} else
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continue;
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while ((lmbbase <= base) &&
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((j = lmb_overlaps_region(&lmb.reserved, base, size)) >= 0) )
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base = _ALIGN_DOWN(lmb.reserved.region[j].base - size,
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align);
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if ((base != 0) && (lmbbase <= base))
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break;
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}
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if (i < 0)
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return 0;
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lmb_add_region(&lmb.reserved, base, size);
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return base;
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}
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/* You must call lmb_analyze() before this. */
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unsigned long __init lmb_phys_mem_size(void)
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{
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return lmb.memory.size;
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}
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unsigned long __init lmb_end_of_DRAM(void)
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{
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int idx = lmb.memory.cnt - 1;
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return (lmb.memory.region[idx].base + lmb.memory.region[idx].size);
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}
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/*
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* Truncate the lmb list to memory_limit if it's set
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* You must call lmb_analyze() after this.
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*/
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void __init lmb_enforce_memory_limit(unsigned long memory_limit)
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{
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unsigned long i, limit;
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if (! memory_limit)
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return;
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limit = memory_limit;
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for (i = 0; i < lmb.memory.cnt; i++) {
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if (limit > lmb.memory.region[i].size) {
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limit -= lmb.memory.region[i].size;
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continue;
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}
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lmb.memory.region[i].size = limit;
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lmb.memory.cnt = i + 1;
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break;
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}
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}
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