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/*
* Procedures for maintaining information about logical memory blocks.
*
* Peter Bergner, IBM Corp. June 2001.
* Copyright (C) 2001 Peter Bergner.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <common.h>
#include <lmb.h>
#define LMB_ALLOC_ANYWHERE 0
void lmb_dump_all(struct lmb *lmb)
{
#ifdef DEBUG
unsigned long i;
debug("lmb_dump_all:\n");
debug(" memory.cnt = 0x%lx\n", lmb->memory.cnt);
debug(" memory.size = 0x%08x\n", lmb->memory.size);
for (i=0; i < lmb->memory.cnt ;i++) {
debug(" memory.reg[0x%x].base = 0x%08x\n", i,
lmb->memory.region[i].base);
debug(" .size = 0x%08x\n",
lmb->memory.region[i].size);
}
debug("\n reserved.cnt = 0x%lx\n", lmb->reserved.cnt);
debug(" reserved.size = 0x%08x\n", lmb->reserved.size);
for (i=0; i < lmb->reserved.cnt ;i++) {
debug(" reserved.reg[0x%x].base = 0x%08x\n", i,
lmb->reserved.region[i].base);
debug(" .size = 0x%08x\n",
lmb->reserved.region[i].size);
}
#endif /* DEBUG */
}
static unsigned long lmb_addrs_overlap(ulong base1,
ulong size1, ulong base2, ulong size2)
{
return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
}
static long lmb_addrs_adjacent(ulong base1, ulong size1,
ulong base2, ulong size2)
{
if (base2 == base1 + size1)
return 1;
else if (base1 == base2 + size2)
return -1;
return 0;
}
static long lmb_regions_adjacent(struct lmb_region *rgn,
unsigned long r1, unsigned long r2)
{
ulong base1 = rgn->region[r1].base;
ulong size1 = rgn->region[r1].size;
ulong base2 = rgn->region[r2].base;
ulong size2 = rgn->region[r2].size;
return lmb_addrs_adjacent(base1, size1, base2, size2);
}
static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
{
unsigned long i;
for (i = r; i < rgn->cnt - 1; i++) {
rgn->region[i].base = rgn->region[i + 1].base;
rgn->region[i].size = rgn->region[i + 1].size;
}
rgn->cnt--;
}
/* Assumption: base addr of region 1 < base addr of region 2 */
static void lmb_coalesce_regions(struct lmb_region *rgn,
unsigned long r1, unsigned long r2)
{
rgn->region[r1].size += rgn->region[r2].size;
lmb_remove_region(rgn, r2);
}
void lmb_init(struct lmb *lmb)
{
/* Create a dummy zero size LMB which will get coalesced away later.
* This simplifies the lmb_add() code below...
*/
lmb->memory.region[0].base = 0;
lmb->memory.region[0].size = 0;
lmb->memory.cnt = 1;
lmb->memory.size = 0;
/* Ditto. */
lmb->reserved.region[0].base = 0;
lmb->reserved.region[0].size = 0;
lmb->reserved.cnt = 1;
lmb->reserved.size = 0;
}
/* This routine called with relocation disabled. */
static long lmb_add_region(struct lmb_region *rgn, ulong base, ulong size)
{
unsigned long coalesced = 0;
long adjacent, i;
if ((rgn->cnt == 1) && (rgn->region[0].size == 0)) {
rgn->region[0].base = base;
rgn->region[0].size = size;
return 0;
}
/* First try and coalesce this LMB with another. */
for (i=0; i < rgn->cnt; i++) {
ulong rgnbase = rgn->region[i].base;
ulong rgnsize = rgn->region[i].size;
if ((rgnbase == base) && (rgnsize == size))
/* Already have this region, so we're done */
return 0;
adjacent = lmb_addrs_adjacent(base,size,rgnbase,rgnsize);
if ( adjacent > 0 ) {
rgn->region[i].base -= size;
rgn->region[i].size += size;
coalesced++;
break;
}
else if ( adjacent < 0 ) {
rgn->region[i].size += size;
coalesced++;
break;
}
}
if ((i < rgn->cnt-1) && lmb_regions_adjacent(rgn, i, i+1) ) {
lmb_coalesce_regions(rgn, i, i+1);
coalesced++;
}
if (coalesced)
return coalesced;
if (rgn->cnt >= MAX_LMB_REGIONS)
return -1;
/* Couldn't coalesce the LMB, so add it to the sorted table. */
for (i = rgn->cnt-1; i >= 0; i--) {
if (base < rgn->region[i].base) {
rgn->region[i+1].base = rgn->region[i].base;
rgn->region[i+1].size = rgn->region[i].size;
} else {
rgn->region[i+1].base = base;
rgn->region[i+1].size = size;
break;
}
}
if (base < rgn->region[0].base) {
rgn->region[0].base = base;
rgn->region[0].size = size;
}
rgn->cnt++;
return 0;
}
/* This routine may be called with relocation disabled. */
long lmb_add(struct lmb *lmb, ulong base, ulong size)
{
struct lmb_region *_rgn = &(lmb->memory);
return lmb_add_region(_rgn, base, size);
}
long lmb_reserve(struct lmb *lmb, ulong base, ulong size)
{
struct lmb_region *_rgn = &(lmb->reserved);
return lmb_add_region(_rgn, base, size);
}
long lmb_overlaps_region(struct lmb_region *rgn, ulong base,
ulong size)
{
unsigned long i;
for (i=0; i < rgn->cnt; i++) {
ulong rgnbase = rgn->region[i].base;
ulong rgnsize = rgn->region[i].size;
if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) {
break;
}
}
return (i < rgn->cnt) ? i : -1;
}
ulong lmb_alloc(struct lmb *lmb, ulong size, ulong align)
{
return lmb_alloc_base(lmb, size, align, LMB_ALLOC_ANYWHERE);
}
ulong lmb_alloc_base(struct lmb *lmb, ulong size, ulong align, ulong max_addr)
{
ulong alloc;
alloc = __lmb_alloc_base(lmb, size, align, max_addr);
if (alloc == 0)
printf("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
size, max_addr);
return alloc;
}
static ulong lmb_align_down(ulong addr, ulong size)
{
return addr & ~(size - 1);
}
static ulong lmb_align_up(ulong addr, ulong size)
{
return (addr + (size - 1)) & ~(size - 1);
}
ulong __lmb_alloc_base(struct lmb *lmb, ulong size, ulong align, ulong max_addr)
{
long i, j;
ulong base = 0;
for (i = lmb->memory.cnt-1; i >= 0; i--) {
ulong lmbbase = lmb->memory.region[i].base;
ulong lmbsize = lmb->memory.region[i].size;
if (max_addr == LMB_ALLOC_ANYWHERE)
base = lmb_align_down(lmbbase + lmbsize - size, align);
else if (lmbbase < max_addr) {
base = min(lmbbase + lmbsize, max_addr);
base = lmb_align_down(base - size, align);
} else
continue;
while ((lmbbase <= base) &&
((j = lmb_overlaps_region(&(lmb->reserved), base, size)) >= 0) )
base = lmb_align_down(lmb->reserved.region[j].base - size,
align);
if ((base != 0) && (lmbbase <= base))
break;
}
if (i < 0)
return 0;
if (lmb_add_region(&(lmb->reserved), base, lmb_align_up(size, align)) < 0)
return 0;
return base;
}
int lmb_is_reserved(struct lmb *lmb, ulong addr)
{
int i;
for (i = 0; i < lmb->reserved.cnt; i++) {
ulong upper = lmb->reserved.region[i].base +
lmb->reserved.region[i].size - 1;
if ((addr >= lmb->reserved.region[i].base) && (addr <= upper))
return 1;
}
return 0;
}
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