320 lines
7.5 KiB
C
320 lines
7.5 KiB
C
/*
|
|
* 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 <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/bitops.h>
|
|
#include <asm/types.h>
|
|
#include <asm/page.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/lmb.h>
|
|
#ifdef CONFIG_PPC32
|
|
#include "mmu_decl.h" /* for __max_low_memory */
|
|
#endif
|
|
|
|
#undef DEBUG
|
|
|
|
#ifdef DEBUG
|
|
#include <asm/udbg.h>
|
|
#define DBG(fmt...) udbg_printf(fmt)
|
|
#else
|
|
#define DBG(fmt...)
|
|
#endif
|
|
|
|
#define LMB_ALLOC_ANYWHERE 0
|
|
|
|
struct lmb lmb;
|
|
|
|
void lmb_dump_all(void)
|
|
{
|
|
#ifdef DEBUG
|
|
unsigned long i;
|
|
|
|
DBG("lmb_dump_all:\n");
|
|
DBG(" memory.cnt = 0x%lx\n", lmb.memory.cnt);
|
|
DBG(" memory.size = 0x%lx\n", lmb.memory.size);
|
|
for (i=0; i < lmb.memory.cnt ;i++) {
|
|
DBG(" memory.region[0x%x].base = 0x%lx\n",
|
|
i, lmb.memory.region[i].base);
|
|
DBG(" .size = 0x%lx\n",
|
|
lmb.memory.region[i].size);
|
|
}
|
|
|
|
DBG("\n reserved.cnt = 0x%lx\n", lmb.reserved.cnt);
|
|
DBG(" reserved.size = 0x%lx\n", lmb.reserved.size);
|
|
for (i=0; i < lmb.reserved.cnt ;i++) {
|
|
DBG(" reserved.region[0x%x].base = 0x%lx\n",
|
|
i, lmb.reserved.region[i].base);
|
|
DBG(" .size = 0x%lx\n",
|
|
lmb.reserved.region[i].size);
|
|
}
|
|
#endif /* DEBUG */
|
|
}
|
|
|
|
static unsigned long __init lmb_addrs_overlap(unsigned long base1,
|
|
unsigned long size1, unsigned long base2, unsigned long size2)
|
|
{
|
|
return ((base1 < (base2+size2)) && (base2 < (base1+size1)));
|
|
}
|
|
|
|
static long __init lmb_addrs_adjacent(unsigned long base1, unsigned long size1,
|
|
unsigned long base2, unsigned long size2)
|
|
{
|
|
if (base2 == base1 + size1)
|
|
return 1;
|
|
else if (base1 == base2 + size2)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long __init lmb_regions_adjacent(struct lmb_region *rgn,
|
|
unsigned long r1, unsigned long r2)
|
|
{
|
|
unsigned long base1 = rgn->region[r1].base;
|
|
unsigned long size1 = rgn->region[r1].size;
|
|
unsigned long base2 = rgn->region[r2].base;
|
|
unsigned long size2 = rgn->region[r2].size;
|
|
|
|
return lmb_addrs_adjacent(base1, size1, base2, size2);
|
|
}
|
|
|
|
/* Assumption: base addr of region 1 < base addr of region 2 */
|
|
static void __init lmb_coalesce_regions(struct lmb_region *rgn,
|
|
unsigned long r1, unsigned long r2)
|
|
{
|
|
unsigned long i;
|
|
|
|
rgn->region[r1].size += rgn->region[r2].size;
|
|
for (i=r2; 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--;
|
|
}
|
|
|
|
/* This routine called with relocation disabled. */
|
|
void __init lmb_init(void)
|
|
{
|
|
/* 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;
|
|
|
|
/* Ditto. */
|
|
lmb.reserved.region[0].base = 0;
|
|
lmb.reserved.region[0].size = 0;
|
|
lmb.reserved.cnt = 1;
|
|
}
|
|
|
|
/* This routine may be called with relocation disabled. */
|
|
void __init lmb_analyze(void)
|
|
{
|
|
int i;
|
|
|
|
lmb.memory.size = 0;
|
|
|
|
for (i = 0; i < lmb.memory.cnt; i++)
|
|
lmb.memory.size += lmb.memory.region[i].size;
|
|
}
|
|
|
|
/* This routine called with relocation disabled. */
|
|
static long __init lmb_add_region(struct lmb_region *rgn, unsigned long base,
|
|
unsigned long size)
|
|
{
|
|
unsigned long i, coalesced = 0;
|
|
long adjacent;
|
|
|
|
/* First try and coalesce this LMB with another. */
|
|
for (i=0; i < rgn->cnt; i++) {
|
|
unsigned long rgnbase = rgn->region[i].base;
|
|
unsigned long rgnsize = rgn->region[i].size;
|
|
|
|
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;
|
|
}
|
|
}
|
|
rgn->cnt++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* This routine may be called with relocation disabled. */
|
|
long __init lmb_add(unsigned long base, unsigned long size)
|
|
{
|
|
struct lmb_region *_rgn = &(lmb.memory);
|
|
|
|
/* On pSeries LPAR systems, the first LMB is our RMO region. */
|
|
if (base == 0)
|
|
lmb.rmo_size = size;
|
|
|
|
return lmb_add_region(_rgn, base, size);
|
|
|
|
}
|
|
|
|
long __init lmb_reserve(unsigned long base, unsigned long size)
|
|
{
|
|
struct lmb_region *_rgn = &(lmb.reserved);
|
|
|
|
BUG_ON(0 == size);
|
|
|
|
return lmb_add_region(_rgn, base, size);
|
|
}
|
|
|
|
long __init lmb_overlaps_region(struct lmb_region *rgn, unsigned long base,
|
|
unsigned long size)
|
|
{
|
|
unsigned long i;
|
|
|
|
for (i=0; i < rgn->cnt; i++) {
|
|
unsigned long rgnbase = rgn->region[i].base;
|
|
unsigned long rgnsize = rgn->region[i].size;
|
|
if ( lmb_addrs_overlap(base,size,rgnbase,rgnsize) ) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (i < rgn->cnt) ? i : -1;
|
|
}
|
|
|
|
unsigned long __init lmb_alloc(unsigned long size, unsigned long align)
|
|
{
|
|
return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE);
|
|
}
|
|
|
|
unsigned long __init lmb_alloc_base(unsigned long size, unsigned long align,
|
|
unsigned long max_addr)
|
|
{
|
|
unsigned long alloc;
|
|
|
|
alloc = __lmb_alloc_base(size, align, max_addr);
|
|
|
|
if (alloc == 0)
|
|
panic("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
|
|
size, max_addr);
|
|
|
|
return alloc;
|
|
}
|
|
|
|
unsigned long __init __lmb_alloc_base(unsigned long size, unsigned long align,
|
|
unsigned long max_addr)
|
|
{
|
|
long i, j;
|
|
unsigned long base = 0;
|
|
|
|
BUG_ON(0 == size);
|
|
|
|
#ifdef CONFIG_PPC32
|
|
/* On 32-bit, make sure we allocate lowmem */
|
|
if (max_addr == LMB_ALLOC_ANYWHERE)
|
|
max_addr = __max_low_memory;
|
|
#endif
|
|
for (i = lmb.memory.cnt-1; i >= 0; i--) {
|
|
unsigned long lmbbase = lmb.memory.region[i].base;
|
|
unsigned long lmbsize = lmb.memory.region[i].size;
|
|
|
|
if (max_addr == LMB_ALLOC_ANYWHERE)
|
|
base = _ALIGN_DOWN(lmbbase + lmbsize - size, align);
|
|
else if (lmbbase < max_addr) {
|
|
base = min(lmbbase + lmbsize, max_addr);
|
|
base = _ALIGN_DOWN(base - size, align);
|
|
} else
|
|
continue;
|
|
|
|
while ((lmbbase <= base) &&
|
|
((j = lmb_overlaps_region(&lmb.reserved, base, size)) >= 0) )
|
|
base = _ALIGN_DOWN(lmb.reserved.region[j].base - size,
|
|
align);
|
|
|
|
if ((base != 0) && (lmbbase <= base))
|
|
break;
|
|
}
|
|
|
|
if (i < 0)
|
|
return 0;
|
|
|
|
lmb_add_region(&lmb.reserved, base, size);
|
|
|
|
return base;
|
|
}
|
|
|
|
/* You must call lmb_analyze() before this. */
|
|
unsigned long __init lmb_phys_mem_size(void)
|
|
{
|
|
return lmb.memory.size;
|
|
}
|
|
|
|
unsigned long __init lmb_end_of_DRAM(void)
|
|
{
|
|
int idx = lmb.memory.cnt - 1;
|
|
|
|
return (lmb.memory.region[idx].base + lmb.memory.region[idx].size);
|
|
}
|
|
|
|
/*
|
|
* Truncate the lmb list to memory_limit if it's set
|
|
* You must call lmb_analyze() after this.
|
|
*/
|
|
void __init lmb_enforce_memory_limit(unsigned long memory_limit)
|
|
{
|
|
unsigned long i, limit;
|
|
|
|
if (! memory_limit)
|
|
return;
|
|
|
|
limit = memory_limit;
|
|
for (i = 0; i < lmb.memory.cnt; i++) {
|
|
if (limit > lmb.memory.region[i].size) {
|
|
limit -= lmb.memory.region[i].size;
|
|
continue;
|
|
}
|
|
|
|
lmb.memory.region[i].size = limit;
|
|
lmb.memory.cnt = i + 1;
|
|
break;
|
|
}
|
|
}
|