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![Kumar Gala](/assets/img/avatar_default.png)
Introduce the LMB lib used on PPC in the kernel as a clean way to manage the memory spaces used by various boot images and structures. This code will allow us to simplify the code in bootm and its support functions. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
281 lines
6.6 KiB
C
281 lines
6.6 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 <common.h>
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#include <lmb.h>
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#define LMB_ALLOC_ANYWHERE 0
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void lmb_dump_all(struct lmb *lmb)
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{
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#ifdef DEBUG
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unsigned long i;
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debug("lmb_dump_all:\n");
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debug(" memory.cnt = 0x%lx\n", lmb->memory.cnt);
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debug(" memory.size = 0x%08x\n", lmb->memory.size);
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for (i=0; i < lmb->memory.cnt ;i++) {
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debug(" memory.reg[0x%x].base = 0x%08x\n", i,
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lmb->memory.region[i].base);
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debug(" .size = 0x%08x\n",
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lmb->memory.region[i].size);
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}
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debug("\n reserved.cnt = 0x%lx\n", lmb->reserved.cnt);
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debug(" reserved.size = 0x%08x\n", lmb->reserved.size);
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for (i=0; i < lmb->reserved.cnt ;i++) {
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debug(" reserved.reg[0x%x].base = 0x%08x\n", i,
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lmb->reserved.region[i].base);
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debug(" .size = 0x%08x\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 lmb_addrs_overlap(ulong base1,
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ulong size1, ulong base2, ulong 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 lmb_addrs_adjacent(ulong base1, ulong size1,
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ulong base2, ulong 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 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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ulong base1 = rgn->region[r1].base;
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ulong size1 = rgn->region[r1].size;
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ulong base2 = rgn->region[r2].base;
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ulong 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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static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
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{
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unsigned long i;
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for (i = r; 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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/* Assumption: base addr of region 1 < base addr of region 2 */
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static void 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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rgn->region[r1].size += rgn->region[r2].size;
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lmb_remove_region(rgn, r2);
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}
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void lmb_init(struct lmb *lmb)
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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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lmb->memory.size = 0;
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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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lmb->reserved.size = 0;
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}
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/* This routine called with relocation disabled. */
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static long lmb_add_region(struct lmb_region *rgn, ulong base, ulong size)
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{
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unsigned long coalesced = 0;
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long adjacent, i;
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if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) {
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rgn->region[0].base = base;
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rgn->region[0].size = size;
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return 0;
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}
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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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ulong rgnbase = rgn->region[i].base;
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ulong rgnsize = rgn->region[i].size;
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if ((rgnbase == base) && (rgnsize == size))
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/* Already have this region, so we're done */
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return 0;
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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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if (base < rgn->region[0].base) {
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rgn->region[0].base = base;
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rgn->region[0].size = size;
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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 lmb_add(struct lmb *lmb, ulong base, ulong size)
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{
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struct lmb_region *_rgn = &(lmb->memory);
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return lmb_add_region(_rgn, base, size);
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}
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long lmb_reserve(struct lmb *lmb, ulong base, ulong size)
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{
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struct lmb_region *_rgn = &(lmb->reserved);
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return lmb_add_region(_rgn, base, size);
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}
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long lmb_overlaps_region(struct lmb_region *rgn, ulong base,
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ulong 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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ulong rgnbase = rgn->region[i].base;
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ulong 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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ulong lmb_alloc(struct lmb *lmb, ulong size, ulong align)
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{
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return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE);
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}
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ulong lmb_alloc_base(struct lmb *lmb, ulong size, ulong align, ulong max_addr)
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{
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ulong alloc;
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alloc = __lmb_alloc_base(lmb, size, align, max_addr);
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if (alloc == 0)
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printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
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size, max_addr);
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return alloc;
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}
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static ulong lmb_align_down(ulong addr, ulong size)
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{
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return addr & ~(size - 1);
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}
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static ulong lmb_align_up(ulong addr, ulong size)
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{
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return (addr + (size - 1)) & ~(size - 1);
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}
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ulong __lmb_alloc_base(struct lmb *lmb, ulong size, ulong align, ulong max_addr)
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{
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long i, j;
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ulong base = 0;
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for (i = lmb->memory.cnt-1; i >= 0; i--) {
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ulong lmbbase = lmb->memory.region[i].base;
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ulong lmbsize = lmb->memory.region[i].size;
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if (max_addr == LMB_ALLOC_ANYWHERE)
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base = lmb_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 = lmb_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 = lmb_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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if (lmb_add_region(&(lmb->reserved), base, lmb_align_up(size, align)) < 0)
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return 0;
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return base;
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}
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int lmb_is_reserved(struct lmb *lmb, ulong addr)
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{
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int i;
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for (i = 0; i < lmb->reserved.cnt; i++) {
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ulong upper = lmb->reserved.region[i].base +
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lmb->reserved.region[i].size - 1;
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if ((addr >= lmb->reserved.region[i].base) && (addr <= upper))
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return 1;
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}
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return 0;
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}
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